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 1 A size-specific effective dose for patients undergoing CT examinationsChoirul Anam (a*), Freddy Haryanto (b), Rena Widita (b), Idam Arif (b), Toshioh Fujibuchi (c), Geoff Dougherty (d) (a) Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Semarang, Indonesia; and Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia. *anam[at]fisika.undip.ac.id (b) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia. (c) Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Japan. (d) Applied Physics and Medical Imaging, California State University Channel Islands, California, USA. Abstract This study aims to develop a simple method for estimating the size-specific effective dose using the ImPACT software. The size-specific effective dose was calculated from the images of patients who underwent CT examinations of the thorax and abdomen regions. CTDIvol and mAs data were obtained from the dose report. The average of mAs and CTDIvol were used to determine the normalized CTDIvol (nCTDIvol). Patient size was expressed in effective diameter (Deff), and was measured at nine slices along the z-axis. The normalized size-specific dose estimate (nSSDE) was then calculated. The normalized size-specific effective dose was obtained in the “effective dose” text-box by inputting an arbitrary value in the “CTDI (air)” text-box so that the “CTDIvol”text-box showed a similar value to the nSSDE. The results show that the normalized size-specific effective dose decreases exponentially with increasing patient size. The results are consistent with results of Sahbaee formula to within 20%. Topic: Biophysics and Medical Physics 2 Fluence Profiles and Energy Spectral Distributions of 100, 110, And 125 kVp Photon Beams: Results of Monte Carlo Simulations for A Varian OBI 1.4 CBCTHendra Setiawan (a*), Rena Widita (a) a) Department of Physics, Institut Teknologi Bandung Jalan Ganesha 10, Bandung, 40132, Indonesia *hendrasetiawan[at]s.itb.ac.id Abstract Cone Beam Computed Tomography (CBCT) imaging for daily patient localization has gained enormous popularity as one of Image-Guided Radiation Therapy (IGRT) methods in recent years. This was largerly due to the need of higher precision and accuracy in conformal beam delivery technique which is known as Intensity Modulated Radiation Therapy (IMRT). The success of this IMRT method is mainly determined by the treatment planning systems. The aim of this research is to provide detailed characteristics of incident photon beams for different beam energies from a Varian OBI 1.4 CBCT. The detailed characteristics consists of fluence profiles and energy spectral distributions. This information is critical to the future development of accurate treatment planning systems. BEAMnrc as one of EGSnrc Monte Carlo user code, has been used to simulate 100, 110, and 125 kVp photon beams from x-ray tube of a Varian OBI 1.4 CBCT. The details of each particles complete history including where it has been and where it has interacted is stored in a phase space data file. The phase space files are analyzed to obtain fluence profiles and energy spectra distributions. Topic: Biophysics and Medical Physics 3 The impact of head miscentering on the eye lens dose in CT scanning: Phantoms studyChoirul Anam (a*), Toshioh Fujibuchi (b), Takatoshi Toyoda (b), Naoki Sato (b), Freddy Haryanto (c), Rena Widita (c), Idam Arif (c), and Geoff Dougherty(d) (a) Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Indonesia; and Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia. (b) Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Japan. (c) Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia. (d) Applied Physics and Medical Imaging, California State University Channel Islands, California, USA. Abstract The aim of this study was to evaluate the eye lens dose due to miscentering, either above or under the isocenter, and to assess the possibility of eye lens dose reduction by using miscentering phenomenon. We used two types of phantoms (head CTDI and adult anthropomorphic phantoms) and two types of detectors (pencil ionization chamber and radiophotoluminescence detectors). Measurements using the head CTDI phantom and pencil ionization chamber were performed at the upper peripheral hole of the CTDI phantom, whereas measurements using RPL detectors were performed on the surface of the eyes of the anthropomorphic phantom. Each measurement was performed with position phantoms at the isocenter and also at the positions Topic: Biophysics and Medical Physics 4 Characterization of Calcium Powders from Merauke Mangrove Crab ShellsKhaeriah Dahlan, Endang Haryati, Octolia Togibasa, Kiagus Dahlan Cenderawasih University, Bogor Agricultural Institute Abstract Integrated research in the field of biomaterials over bioceramic synthesis into subtitutive material of composite bone, especially on unique materials from Papua, was being developed. In this study we report the successful fabrication of calcium powders by utilizing mangrove crab shells originating from Merauke as a natural source of calcium. Three variations of temperature, 1073 K, 1173 K and 1273 K, were used in the calcinations process. Synthesized Calcium powders were characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy, to determine its potential as a bone subtitute composite. The results were compared with commercials calcium carbonate powder. The adopted methods were cost effective and ecofriendly, since Merauke mangrove crab shells were considered a waste for every household, abundant and easy to obtained. In addition, the Merauke mangrove crab shells contained zero harmful compounds due to the natural ecosystems that are less polluted from urban and industrial activities. Topic: Biophysics and Medical Physics 5 PROTEIN AND MINERALS ANALYSES OF MANGROVE CRAB SHELLS AS FOUNDATION ON BIOCERAMIC COMPONENTS FROM MERAUKEEndang Haryati*1), Khaeriah Dahlan1), Octolia Togibasa1), Kiagus Dahlan2) 1)Department of physics, Cenderawasih University 2)Department of physics, Bogor Agricultural Institute *) corresponding author: endanghfis[at]gmail.com Abstract The analyses over protein and minerals of the mangrove crab shell from Merauke have been studied. Shells of the mangrove crab that have been cleansed and dried under the sun for 24 hours, were mashed and then divide into two parts. The first section was used for the analysis of protein, phosphor calcium, magnesium and aluminium contents, while the second part was previously calcined at temperatures of 1273 K for 5 hours before analyzed. The results showed that the mangrove crab shells originating from Merauke contained 9.57% w/w of protein, 3861.83 mg/kg of phosphorus, 29.04% w/w calcium, 1.99% w/w magnesium and 107.00 mg/kg aluminium. After the process of calcination, the calcium content in shell powder of crab has increased. It can be concluded that shell of the mangrove crab from Merauke, posses basic materials as bioceramic. Topic: Biophysics and Medical Physics 6 Characterization of Bio-battery from Tropical Almond PasteOctolia Togibasa, Endang Haryati, Khaeriah Dahlan, Yane Ansanay, Tresiani Siregar, Mersi Natalia Liling Department of Physics, Cenderawasih University, Jayapura, 99358, Indonesia Abstract The rapidly growing demand of energy together with diminishing of fossil-fuel resources has led an energy crisis problem in all over the world. The invention of bio-batteries has contributed in the pursuit of both sustainable and renewable energy sources technologies. A bio-battery generates electricity from renewable fuels such as human blood, fruit, vegetables, and other bio-compounds, which providing a sustained and portable power source. However, bio-compounds involving crops should be avoided to prevent food shortages. Tropical almond (Terminalia catappa L.) popularly known as ketapang in Indonesia, is considered as potential bio-compound for bio-battery since its non-crops and grows abundantly in Indonesia. In this study we developed a prototype of bio-battery from tropical almond (Terminalia catappa L.) paste. The characterization of these batteries gave a peak power of 0.25 mW and a stable current up to 2 days. The presence of glucose in electrolyte paste will also be discussed. Topic: Biophysics and Medical Physics 7 The Influence of Lea-Catcheside Time Factor in Fractionated RadiotherapyHasto Arief N (a*), Rena Widita Ph.D (a) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia *hastoarief[at]gmail.com Abstract The linear-quadratic (LQ) formulation is universally used for calculating the effects of alterations in the dose per fraction and the fractionation scheme in radiotherapy regimen. LQ is mechanistic biologically-model that includes some of the biological phenomenons of the tissue responses caused by radiation. The phenomenons are repair, repopulation, reoxygenation and redistribution. Reoxygenation and redistribution have the same response due to radiation, therefore these two mechanism will be included into one mechanism called resensitization. Repair and resensitization mechanism will have different value every fractionation. To reckon those parameters, LQ has a parameter called Lea-Catcheside time factor. Lea-Catcheside time factor is a parameter within LQ which calculates the effect of the fractionation and protraction scheme. The objective of this research is to analyze the effect of the change in fractionation scheme and dose per fraction from the obtained Lea-Catcheside time factor parameter. The break-time between fraction and dose per fraction will be changed periodically to obtain the Lea-Catcheside time factor as well as the survival factor of the cell in the tumor and organ at risk around the tumor. The result shows that the longer the break time between fraction or the smaller the given dose per fraction, the survival fraction will have the same value as the survival fraction without the Lea-Catcheside time factor, i.e the effect of the Lea-Catcheside time factor will be small and can be neglected. Topic: Biophysics and Medical Physics 8 Study of Electroencephalogram pattern from Eye Response to Flickering LightMeda C. Fitriani, Siti N. Khotimah, Freddy Haryanto, and Suprijadi Institut Teknologi Bandung Abstract Electroencephalograph (EEG) has been widely used in brain wave mapping studies with several subject conditions, such as in evaluations of dementia and encephalopathy, screening for possible epileptic spikes, investigational for clinical use in mental disorders. In addition, the EEG has also been used to investigate the response of human brain in listening to music, movement of arm, and turning of neck. In this study, electroencephalograph was used to study the eye response to the blinking light. Brain waves recorded during the subject watching flickering light by using wireless electroencephalograph 14 channels. By recording the brain waves of the subject in the ?Edf?s? format, the electroencephalogram was then analyzed using tools such as channel spectra and maps, centering, filtering, and Welch?s power spectral density estimation. Using Power Spectra Density (PSD) graph, we can estimate the active part of the lobe as eye responds to flickering light, i.e. left Frontal lobe, right Temporal lobe and both side of Occipital lobe. Topic: Biophysics and Medical Physics 9 Investigation of Pulse rate and ABPI (Ankle-Brachial Pressure Index) in Relax Condition and after ExercisePuspa Monalisa , Siti N. Khotimah, Sparisoma Viridi, and Freddy Haryanto Institut Teknologi Bandung Abstract Earth gravitational field influences physiological systems such as the cardiovascular and circulatory systems. Therefore changing the body position (standing, sitting, or supine) affects blood pressure. In addition to pressure, pumping blood throughout the body is also affected by the contraction of the hearts ventricles. The number of heartbeat per minute (pulse rate) for each person varies and is affected by physical activity. In this work, blood pressure and pulse rate when subject in relax condition when supine, sitting, and standing position are read using a set of digital sphygmomanometer OMRON type JPN-1. Blood pressure and pulse rate for subject after exercise are read at sitting position. The human circulatory system in the arteries is analyzed using the Bernoulli equation to estimate the mass density of the blood from the slope of a blood pressure to altitude curve. The ratio of the systolic blood pressure at the ankle to the systolic pressure at brachium is calculated for the ankle-brachial pressure index (ABPI) then it can be used to detect PAD (Peripheral Artery Disease) as one of the cardiovascular disease. Topic: Biophysics and Medical Physics 10 Myocardial Infarction Detection System from PTB Diagnostic ECG Database Using Fuzzy Inference System for S-T WavesArdan Adi Nugroho, Miftahul Maarif, Aisyah Zahrotul Hidayah, Olivia Maftukhaturrizqoh, Titin Sri Martini Faculty of Mathematics and Natural Sciences, Sebelas Maret University Abstract Heart disease was the one of major health problem in the world, which caused many deaths. Myocardial infarction is one type of heart disease which caused by a blockage in the coronary arteries. This disease could be detected by reading ECG wave result. Knowledge and expert analysis were required to read PQRST-wave in Electrocardiograms. Fuzzy inference system was used in this detection system because it flexibility on linguistic variables. Fuzzy inference system could be performed after discovery S and T peaks. The characteristics of Myocardial Infarction could be seen through the condition of S and T wave. Detection system test was conducted on databases that obtained from Physionet bank PTB diagnostic ECG. The result of this research showed that test of detection system had sensitivity level of 73%. Topic: Biophysics and Medical Physics 11 Heart Sounds Determination Based on Sliding Window Maximum MethodBintang Adi Kusuma, Nuryani & Darmanto Universitas Sebelas Maret Abstract Abstract. Determining location of heart sounds is necessary for segmentation and feature construction. Highest peak determination can be an alternative to find heart sounds location. In this paper, we use sliding window maximum method to find the highest peak of heart sounds. The sliding window maximum method uses a window that slide from left (old signal) to the right (new signal) of heart sounds signal and finds the signal?s maximum value and it?s position at the window. Highest peak location is classified to be heart sound if it?s value is higher than a defined threshold and it?s position is at the middle of window. Signal of heart sounds is received by microphone and then the signal is filtered using resistor capacitor (RC) circuit. The signal is amplified using non-inverted amplifier Operation Amplifier (OP AMP) circuit. Signal from the amplifier is read by analog to digital converter (ADC) of arduino nano. In arduino nano heart sounds signal are processed using digital signal processing Infinitive Impulse Response filter (IIR Filter). The filters are to get dub and lub (S1 and S2) heart sounds signal. The signal processing result is stored in personal computer (PC). 488 heart beats or 976 S1 and S2 heart sounds of 3 patients are processed. The signal is then processed to determine heart sound location using sliding window maximum method. Using this method we find accuracy, sensitivity and positive predictive of 94.16%, 98,26%, and 96.00%, respectively. Topic: Biophysics and Medical Physics 12 Superabsorbent polymers of glucomannan-poly(potassium acrylic-acrylamide) hydrogel: Synthesis and characterization by gamma irradiation for personnel care applicationS.Mulijani, Sri Sugiarti, Qory and Erizal Department of Chemistry Bogor Agriculture University Abstract In the current work, synthesis of an environmental-sensitive superabsorbent polymer using ɣCo irradiation is described. Grafted poly(potassium acrylic) onto a homogeneous solution of glucomannan and acrylamide hybrid backbones created a smart material with reversible behavior. The reaction parameters (i.e. acrylic acid, acrylamide and glucomannan concentration, as well as irradiation time) affecting the water absorbency of the hydrogel were optimized, in order to achieve a hydrogel with high swelling capacity. FTIR spectroscopy was used for conforming the structure of the final product and the morphology of the synthesized hydrogel was examined by a scanning electron microscope. The swelling behavior of the optimized hydrogel sample in various KOH concentrations and swelling kinetics in distilled water were investigated. The pH-reversibility and on-off switching behaviors of entitled smart hydrogel make it a good candidate for consideration as a potential material for personal care. Topic: Biophysics and Medical Physics 13 Chitosan-Based Coating as an Alternative Post-harvest Technology for BananaRizkita Rachmi Esyanti1,2*, Herafi Zaskia1,4, Annisa Amalia1,3 dan Husna Nugrahapraja1,3 1 School of Life Sciences and Technology, Institut Teknologi Bandung, Bandung 40132, Indonesia 2 Bioscience and Biotechnology Research Center, Institut Teknologi Bandung, Bandung 40132, Indonesia 3 Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Bandung 40132, Indonesia 4 ForMIND Institute, Bandung 40135, Indonesia Abstract Losses during post-harvest management is a common problem faced in agricultural sector. . To prolong the preservation time perishable fruits, such as banana, edible coating is one of an alternative method for fruit preservation method. Aims of this research are to utilize chitosan nano-particle as edible coat and to observe its effect on Cavendish bananas (Musa acuminata AAA group) ripening process. In this study, we synthesized and characterized chitosan nano-particle, as well as observed chitosan nano-particle coating effect on fruit ripening process. The result showed that, the ionic gelation method can be used to produce chitosan nanoparticles with average diameter of 102.4 - 370 nm and polydisperity index of 0.251 ? 0.303. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed a new peak which indicated an interaction of amide groups in chitosan and tripolyphosphate groups in NaTPP. A Scanning Electron Microscope (SEM) showed a smoother skin contour on coated banana compared to control (non-coated). Observations of physical characteristics of bananas ripening showed that fruits coated with chitosan nanoparticles 0.2% has a slower skin discoloration by 2-3 days compared to control treatment. Topic: Biophysics and Medical Physics 14 Theoretical study of the frontier orbitals of tetrahydrocurcumin in hydrogen atom transfer mechanismLusia S. P. Boli1*, Vera Khoirunisa1, Adhitya G. Saputro1,2, Mohammad K. Agusta1,2, Febdian Rusydi3, Heni Rachmawati2,4, Hermawan K. Dipojono1,2 1Department of Engineering Physics, Institut Teknologi Bandung, Bandung, Indonesia 2Research center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Bandung, Indonesia 3Department of Physics, Airlangga University, Surabaya, Indonesia 4School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia Abstract In this present work, we study highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of tetrahydrocurumin (THC) using density-functional theory (DFT). Experimentally, THC has been proofed to scavenge an organic free radical, 2,2-diphenyl-1-picrylhydrazyl (DPPH). We aim our study to investigate the HOMO-LUMO of THC to explain its ability in transferring a hydrogen atom toward free radicals. We begin by optimizing a THC molecule without a hydrogen atom in three sites. Then, we compare the value of HOMO-LUMO in each site to predict the reactivity of the site toward free radicals. Our calculation reveals that two OH groups of THC have a very similar value of HOMO-LUMO energy. This occurs due to the symmetrical shape of the molecule. We predicted that OH groups of THC are the active sites in transferring hydrogen atom to scavenge free radicals. Topic: Computational Physics 15 Enthalpy of Formation of NaxCoO2 and (Na,Mg)xCoO2 Systems: A First Principle Calculation StudyI. Kurniawan and B. Prijamboedi Inorganic and Physical Chemistry Research Div. Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132, INDONESIA Abstract Sodium cobaltate, NaxCoO2 (NCO) has potential application as thermal-electric conversion devices due to large thermoelectric power value. The NCO compound also could be applied in sodium battery system. Stability of this compound is important for those applications since the content of sodium determine the properties of NCO compound. The enthalpy of formation of NCO compound with 0 < x < 1 and partially substituted Na with Mg in composition of (Na,Mg)xCoO2 has been calculated using full potential-linear augmented plane wave (FP-LAPW) method within density functional theory (DFT). The enthalpy of formation of NCO was found to decrease as sodium concentration, x increases. We found that the enthalpy of formation decreases more rapidly in region of 0 < x < 0.5 and slower in 0.5 < x < 1, which is indicating the different stability region against sodium concentration. The substitution of Mg2+ into Na+ sites decreases the enthalpy of formation of NCO compound and suggests Mg2+ substitution could increase compound stability. In the electronic structure, Mg2+ substitution is found to lower the position of unfilled Co-3d band for about 0.2 eV compared to the NCO compound. The computational results also reveal that the Co effective charge is linearly decreasing as x increasing. It is revealed also that the effective charge of Co at x = 0.5 consist of 2 different values and ordering occur along one crystal axis and this lead to metal-insulator transition at x = 0.5. Topic: Computational Physics 16 Phosphorus Dopant Configuration on Active Sites of the Pyrolyzed Fe/N/C CatalystApresio Kefin Fajrial, Adhitya Gandaryus Saputro, Mohammad Kemal Agusta, Hermawan K. Dipojono Engineering Physics Research Group, Institut Teknologi Bandung Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung Abstract One of the main challenge in realizing the commercialization of hydrogen fuel cell as an energy source is how to substitute the scarce Pt based catalyst on the cathode part of the fuel cell with an alternative low-cost catalyst. Pyrolyzed Fe/N/C catalyst is a type of alternative catalyst that gains a remarkable reputation in recent years due to its good performance in catalyzing the oxygen reduction reaction (ORR) on the cathode of hydrogen fuel cell. Despite the notable catalytic activity of the pyrolyzed Fe-N-C catalyst, its performance still needs to be increased. One of the possible routes for an increase in the performance is by adding dopant. We propose to add phosphorus (P) doping on the Fe/N/C catalyst to enhance its catalytic performance. As an initial study, we investigate the interaction of this P dopant with the active sites of pyrolyzed Fe/N/C catalyst. During the synthesis of the pyrolyzed iron and nitrogen containing carbon catalyst (Fe-N-C), a variety of active sites may occur particularly the iron-nitrogen complex site (FeNx) and the nitrogen metal-free site (CNx). This sites might interact with the P dopant and form some unique configurations. We conducted theoretical study concerning this issue using Density Functional Theory (DFT) approach. Our results show that the P dopant prefers to form bonding configuration with the prevailed nitrogen (N) atom whether associated with the FeNx or the CNx. We find that the presence of P dopant distorts the local planarity of the graphitic structure of the catalyst. However, the geometry of FeNx site remains unaltered with the presence of P near the site. We further discussed regarding the geometry and formation energy of the possible configurations. Topic: Computational Physics 17 Casimir effect between two intruders in two-dimension self-gravitation granular particles systemPutri Mustika Widartiningsih, Siti Nurul Khotimah, Budi Dermawan, Sparisoma Viridi Institut Teknologi Bandung Abstract Two identical intruders with diameter D are placed inside a system of N two-dimension self-gravitation granular particles near the corner of the bed particles, each in opposite direction. Initial separation distance between the two intruders are more than twice of their diameter. The bed particles have diameter d. All particle are not in contact at $$t$$ = 0 in order to give initial vibration to the system. Intruders have mass M and bed particles m. Intruders tend to group in the center of the system for $$M/m > 1$$ and $$D/d = 1$$, to group on the suface for $$M/m = 1$$ and $$D/d > 1$$, to group not in particular radial position for $$M/m > 1$$ and $$D/d > 1$$. These condition could be addressed to crossover condition between Brazil-nut effect (BNE) and reverse Brazil-nut effect (RBNE) near earth surface (Hong et al., 2001), but with slightly different characteristics. Intermittens conditions are exptected but not observed cleary. Compaction or increasing of contactopy is observed but not so pronounce. Topic: Computational Physics 18 Extending Voigt and Reuss Model using Virial Expansion for Simulating Self-Memory CompositeWibias Muliawan, Widayani, Sparisoma Viridi Institut Teknologi Bandung Abstract Self-memory material is modeled using parallel and series configuration of two compounds constructing composite material. Temperature $$T$$ and stress $$F$$ are the two free variables in determining material length. Length expansion as function only of $$T$$ or only of $$F$$ is already common, but combining both is still an open problem. In this work virial expansion is also used to assure that for certain range of $$T$$ and $$F$$ the expression should arrive to the known relation, e.g. $$\Delta{}L = L\alpha{}\Delta{}T$$ and $$\Delta{}L = (L/AE) \Delta{}F$$, by introducing some expansion coefficients in the form of $$\alpha = \sum_{n=0}^{N}{c_n T^n}$$ for linear thermal expansion coefficient. As the results, behaviour in linear range is acceptable but not in the nonlinear one, which is still a puzzle. Topic: Computational Physics 19 Study of Star Orbit Around Axisymmetric Potential of Milky Way GalaxyA. Fitriana 1, MI Arifiyanto 2 1 Department of Physics , Institut Teknologi Bandung 2 Department of Astronomy, Institut Teknologi Bandung Abstract We present the simulation of star orbit under the static axisymmetric galactic potential of Milky Way Galaxy with some varying initial conditions. We consider the static galactic parameters at present day and numerically integrate forwards within time range 2 Gyr using 4th Order Runga Kutta method. In order to obtain more informative explanation, we visualize the star orbit in javascript. A detailed discussion is shown by investigating the star orbit parameters in different potential models of bulge, disk, and halo. Our simulation provides a helpful view in learning an object orbit under gravitational potential. Topic: Computational Physics 20 Numerical study of crystallization kinetics of Polypropilene using Nakamura theoryM. Joshua Y.B, M. Irsyad Arbi, Hanindito Haidar Satrio, M. Chalid, Jaka Fajar Fatriansyah Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Jawa Barat, 16424 Abstract The prediction of degree of crystallization in plastics especially Polypropilene manufacturing process is very important to optimize mechanical properties of the products. Employing Nakamura theory of crystallization kinetics, we simulate the distribution of degree of crystallization for some geometries. By controlling the cooling rate during crystallization process, we obtain the relation between cooling rate and degree of crystallization as well as the effect of position of coolant on cooling rate. It was found that the higher cooling rate yields higher degree of crystallization. Topic: Computational Physics 21 Hexagonal Metamaterial Filter with Embedded and Non-Embedded Metallic Inclusion for Microwave ApplicationsRomi Fadli Syahputra (1*), Mohammad Fandi Kurnia (1), Ikhsan Rahman Husein (1), Saktioto (1) (1) Physics Department, Math and Natural Science Faculty, Universitas Riau Bina Widya Campus, Jl. HR Soebrantas KM 12,5, Pekanbaru 28293, Indonesia *romifadlisyahputra[at]yahoo.com Abstract The metamaterial has numerous applications for imaging, electromagnetic filters, stealth technology, and biosensor systems. This paper investigates a hexagonal metamaterial structure with a split and a double concentric metallic rings, so-called split ring resonator hexagonal (SRR-H) for frequency filtering applications. SRR-H is designed structurally and operated computationally for microwave frequency. The simulation results showed that SRR-H size will affect the resonant frequency significantly. The resonant frequency goes to red shift when the size of the structure is enlarged. SRR-H structure is able to enhance magnetic permeability. We successfully simulated SRR-H metamaterial to obtain double negative and agreed with Lorentz?s model. Topic: Computational Physics 22 SELF-SIMILARITY RELATIONSHIP MODEL PIGEONHOLE TO FRACTAL DIMENSION ON 3D POROUS ROCK MODELAceng Kurnia Rochmatulloh, Ulpa Zein Fawziah, Selly Feranie, Fourier Dzar Eljabbar Latief Universitas Pendidikan Indonesia Abstract A self-similarity relationship to the fractal dimension of 3D porous rock models has been obtained by applying the Box-Counting fractal dimension calculation method. Self-similarity is a characteristic of fractals which shows that fractals consist of similarly shaped parts at each scale. 3D porous rock model that will be made is Pigeon Hole 3D model that uses self-similarity principle in structure and substructure. The first stage of nine rock models was made with 210 ? 210 ? 210 pixels and the matrix distribution of the rock formers was arranged randomly with pigeon-hole-shaped grains spaced radius in the range of 11-20 pixels, 21-30 pixels, and 31- 40 pixels with the same porosity of 30% and the level of self-similarity varied (levels 0, 1, and 2). The fractal dimensional results obtained for the Pigeon Hole model radiate within the range of 11-20 pixels at the self-similarity level of 0, 1, and 2 ie 2.9741, 2.9813, and 2.9862. For the Pigeon Hole model radiated in the 21-30 pixel range at the level Self-similarity 0, 1, and 2 obtained fractal dimension values of each of 2.9792, 2.9869, and 2.9895. And the fractal dimensions obtained for the Pigeon Hole model radiate within the range of 11-20 pixels at the self-similarity level of 0, 1, and 2 ie 2.9797, 2.9885, and 2.9916. From the data obtained that the greater the level of self-similarity in the model Pigeon Hole forming rock model, the fractal dimension in the model of rocks is also greater. Topic: Computational Physics 23 Effect of High Pressure on Structural and Electronic Properties of Silicon System with Fd3m Space GroupShibghatullah Muhammady*, Sendi Nugraha Pratama, Yudhi Kurniawan, Yudi Darma** Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia Abstract We study on effect of high pressure on structural and electronic properties of silicon (Si) system with Fd3m space group calculated by using generalized gradient approximation. In room pressure (P) of 10-4 GPa, calculated lattice parameter (a) and bandgap (Eg) are respectively 0.5163 nm dan 0.643 eV with indirect type (G to 0.4D). On the other hand, at P of 5 GPa, calculated a and Eg are reduced to 0.5076 nm dan 0.564 eV with indirect type (G to 0.4D), respectively. At P of 11.3 GPa, when the space group of Si starts to be I41/amd, calculated a and Eg are further reduced to 0.4989 nm dan 0.442 eV with indirect type with modified transition from G to X points. Besides, obtained valence band is mainly from Si 3p states near Fermi level and Si 3s at lower energy levels, while obtained conduction band is mainly from Si 3p states. The widths of both bands are increased due to the increasing of P. Overall, this study shows that pressure can be used to tune the structural and electronic properties of Si system and can be a guide for high-pressure Si-based photonic application. Topic: Computational Physics 24 Enhancement of Ferromagnetic Properties in BiFe1-xZnxO3 (x=0.1 and 0.07) by Chemical SynthesisDwita Suastiyanti, Ismojo Mechanical Engineering Department - Institut Teknologi Indonesia Abstract One of the chemical compounds that has multiferroic properties is BiFeO3. The multiferroic properties of the material would be better if the material has good magnetic properties as well. To obtain a high magnetic properties, the engineering process is carried out to synthesis BiFe1-xZnxO3 (x = 0.1 and 0.07) by doping Zn into BiFeO3 compound. Engineering process performed by sol-gel method. Calcination in sol-gel method is carried out at a temperature of 175oC for 4 hours and the sintering process at a temperature of 650oC for 2, 4 and 6 hours. Characterization of the powder is modified done by using TGA / DTA test, X-Ray Diffraction (XRD) and magnetic properties (Vibrating Sample Magnetometer) test. By TGA / DTA test, it could be seen that the calcination process could be performed at temperatures of 150 and 175oC and sintering process could be carried out at a temperature of 650oC. From the result of XRD test, it is shown that the powder of BiFe0.93Zn0.07O3 has minimum impurities (bismite 2.9% and iron 3.6%) at calcination temperature of 175oC for 4 hours and sintering at 650oC for 6 hours. But the most excellent magnetic properties belongs to powder of BiFe0.9Zn0.1O3 with the value of magnetic polarization saturation of 0.65 emu/gram, while the value of magnetic polarization saturation for BiFe0.93Zn0.07O3 is 0/45 emu/gram. Topic: Condensed Matter Physics 25 Theoretical Investigation on the Possibility of Montmorillonite in Reducing Air Pollution: A Density Functional Theory StudyTriati Dewi Kencana Wungu (a,c*), Meqorry Yusfi (b), Suprijadi (b,c) a) Nuclear Physics and Biophysics Research Group, Department of Physics, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132 triati[at]fi.itb.ac.id b) Theoretical High Energy Physics and Instrumentation Research Group, Department of Physics, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132 c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, CAS Building, Jalan Ganesa 10 Bandung 40132 Abstract Increasing economic growth spurs the development of the automotive industry that turned out to give negative effects, especially on the environment. Air pollution obtained from vehicle exhaust continues to increase and led to a steep increase in various illnesses. Therefore, air pollution control efforts are needed. One of the ways is to utilize materials that have high absorption of pollutants which can be found in a smectite group clay. In this research the density functional theory (DFT) method is used to investigate the stability and the changes of electronic properties of lead oxide adsorbed on smectite clay mineral. A Mg substituted clay named montmorillonite, with Ca(II) compensating cations on its surface has confirmed to be interacted with lead oxide seen from their bond length through physisorbed reaction. The large surface area on montmorillonite is one of the reasons that lead oxide can be interacted with montmorillonite. Topic: Condensed Matter Physics 26 Thermophysical Parameters of Organic PCM Coconut Oil from T-History Method and Its Variation with Chemical DopantAlfriska O Silalahi1, I M Sutjahja1, D Kurnia1 and S Wonorahardjo2 1 Dept. of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung 2 Building Technology Research Division, School of Architecture, Planning and Policy Development, Institut Teknologi Bandung Jl. Ganesha No. 10, Bandung, Indonesia 40132 Abstract The thermophysical parameters of organic phase change material (PCM) of coconut oil (co_oil) have been studied by analyzing the temperature vs time data during liquid-solid phase transition (solidification process) based on T-history method. Analysis of the data have reveal the values of solid specific heat, liquid specific heat and the heat of fusion of co_oil. In this paper we describe the thermophysical parameters of co_oil along with the type and concentration of micro-particle chemical dopant. The dopant consist of graphite and metal oxides (CuO and ZnO), with concentration of 1%wt and 2%wt, while the data of pure co_oil is used for comparison. We found that the values of liquid specific heat almost unchanged with the type and concentration of the dopant, while the values of solid specific heat decrease with dopant for all type of dopant regardless the amount of dopant concentration. The heat of fusion, on the other hand, has different variation for different type of dopant: it almost constant for graphite dopant, decreases monotonously for CuO dopant, while for ZnO dopant it has a maximum value for 1%wt dopant. These values are important to estimate the heat storage capability of co_oil and also usefull to analyze the thermal conductivity data based on the same method. Topic: Condensed Matter Physics 27 The Role of Micro Particle Dopant to the Thermal Conductivities of PCM Coconut Oil by Means of T-History MethodAlfriska O. Silalahi,1 I.M. Sutjahja,1 D. Kurnia,1 S. Wonorahardjo2 1 Dept. of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung 2 Building Technology Research Division, School of Architecture, Planning and Policy Development, Institut Teknologi Bandung Jl. Ganesha No. 10, Bandung 40132 Abstract We described in this paper the role of chemical dopant to the thermal conductivity of organic phase change material (PCM) of coconut oil (co_oil) based on T-history method. We used the micro particle dopant that consist of graphite, CuO and ZnO. Each kind of dopant was added to co_oil in certain amount of 1%wt and 2%wt. For comparison, the data of pure co_oil was also taken and compared to the reference values. Due to smaller diameter to height ratio of the reaction tube that are used in the measurement, the lumped capacitance method is applicable here. Hence, the heat transfer from PCM to water during solidification or melting is one dimensional, so that the one dimensional transient heat diffusion equation for cylindrical geometry is applicable. Analysis of the data for solidification and melting processes led to the values of solid and liquid thermal conductivities. We note that in general the dopants have effectively increased the thermal conductivities of co_oil, which is important for the effective heat transport of the material as response to the environment condition. Topic: Condensed Matter Physics 28 Enthalpy-Temperature Curve of Phase Change Materials of CaCl2.6H2O and Coconut Oil for Latent Heat Energy StorageAlfriska O Silalahi1, Nissa Sukmawati1, I M Sutjahja1, D Kurnia1 and S Wonorahardjo2 1 Dept. of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung 2 Building Technology Research Division, School of Architecture, Planning and Policy Development, Institut Teknologi Bandung Jl. Ganesha No. 10, Bandung, Indonesia 40132 Abstract Enthalpy as a function of temperature is one of the most important thermophysical parameters of phase-change materials (PCM). This parameter is particularly essential to optimize the performance of PCM as latent heat energy storage for certain application, since it determine the quantity of thermal energy around the phase change region. In this paper the enthalpy-temperature curve of inorganic and organic PCM of CaCl2.6H2O and coconut oil have been studied by analyzing the temperature vs time data during liquid-solid phase transition (solidification process) based on T-history method. The analysis of the data have been performed following the method by Marin et al. The results show the crystallization or solidification temperature and the estimated amount of solid-liquid enthalpy change, to be compared with the data obtained from other analysis or measurement methods. Topic: Condensed Matter Physics 29 The Effect of Pluronic 123 Surfactant concentration on The N2 Adsorption Capacity of Mesoporous Silica SBA-15: Dubinin-Astakhov Adsorption Isotherm AnalysisDonanta Dhaneswara, Dewantoro Putranto & Jaka Fajar Fatriansyah Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Jawa Barat, 16424 Abstract Mesoporous SBA-15 has been succesfully synthesized at various concentration of Pluronic 123 surfactant ( 7 mM, 50 mM, 54 mM, 60 mM and 66 mM ) and the effect of these various concentrations on the N2 adsorption capacity has been investigated. The adsorption analysis was conducted using Dubinin-Astakhov isotherm model for multi-layer adsorption phenomenon. It was found that at low concentration of Pluronic 123, the system exhibits type I adsorption while at high concentration, the system exhibits type IV adsorption with H1 hysteresis curve which indicates capillary condensation, relatively uniform channel like pores and possibility of pore network effects. It also was found that, by using D-A isotherm model fitting, at 60 mM concentration of Pluronic 123, SBA-15 has the highest adsorption capacity which stands at 421 cm3/gram. Topic: Condensed Matter Physics 30 The comparative study of Pure SBA-15 and CPTMS-SBA-15 silica mesoporous adsorption of Pb heavy metalDonanta Dhaneswara, Farhan Delayori, Siti Utami A. A. & Jaka Fajar Fatriansyah Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Jawa Barat, 16424 Abstract Mesoporous SBA-15 has been succesfully synthesized at optimized concentration of Pluronic 123 surfactant 60 mM which yields surface area of 900 m2/gram determined by BET N2 adsorption isotherm test at 77 K. This very high surface area was utilized to remove the Pb in industrial waste water using laboratory made water samples. However, pure SBA-15 is not enough to be used as adsorbant. We functionalized pure SBA-15 with CPTMS in order to make adsorption capacity higher than pure SBA-15. In this paper, we compared the percentage of Pb removal using pure SBA-15 and CPTMS-SBA-15 systems. It was found at low concentration of adsorbant, CPTMS-SBA-15 yields three times percentage of Pb removal than pure SBA-15. However at high concentration of adsorbant, CPTMS-SBA-15 percentage of Pb removal is just slighty higher than pure SBA-15 percentage of Pb removal. Topic: Condensed Matter Physics 31 Study of The PDMS / Silica Cristobalite Composite Hydrophobic Surface from Natural SandRoihatur Rohmah (a*), Moch. Zainuri (b) a) Institut Teknologi Sepuluh Nopember, Surabaya Jl. Raya ITS, Keputih, Sukolilo, Surabaya *roihaturrohmah[at]gmail.com b) Institut Teknologi Sepuluh Nopember, Surabaya Abstract The observation of effect lotus leaves wettability behavior which can be applied in various application. Silica had a good characteristics in terms of hydrophobic stability. This objective of this study was to create a hydrophobic surface from a composite material of SiO2 filler and PDMS polymer as matrix. This research had two mechanism of the process. They were synthesis cristobalite SiO2 and fabrication of hydrophobic surface. Silica was obtained from the purification of natural quartz sand Bancar, Tuban, East Java. Variations of temperature treatment were done at 100, 200, 300, 400, and 500 C on heating process of the hydrophobic surface. The results show that the highest contact angle of hydrophobic surface is 126.4 (hydrophobic) at temperature of 400C and the lowest is 72.4 (hydrophilic) at temperature of 500C. Topic: Condensed Matter Physics 32 Influences of Aluminum Content to The Aspect Ratio (L/r) of Aluminum doped ZnO Nanorod; Growth by Self-Assembly MethodAnnisa Aprilia1, Heri Fernando1, Lusi Safriani1, Ayi Bahtiar1, Tuti Susilawati1 dan Rahmat Hidayat2 1Departemen Fisika, Fakultas MIPA, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang KM 21, Jatinangor 45363 2Departemen Fisika, Fakultas MIPA, Institut Teknologi Bandung, Jl. Ganesa No. 10, Bandung 40132 Abstract This work investigates the influences of aluminum content to the growing process of Aluminum doped Zinc Oxide (AZO) nanorod using self-assembly method. The growth mechanism of zinc oxide (ZnO) nanorod structure is strongly dependent on the ZnO seed layer conditions. In this work we used AZO (0.5 wt% of aluminum) thin film as seed layer which is has relatively low surface roughness compared to undoped ZnO. A low surface roughness of ZnO seed layer has tendency to produce a small diameter of ZnO nanorod. In order to study the existence of aluminum dopan on the formation of AZO nanorod structure, aluminum chloride as doping agent was inserted in nanorod growth solution. Intercalation of aluminum atom to ZnO nanorod structure was occurred during deposition processes via self-assembly method at 100?C for 120-180 minutes. The influences of aluminum content on the structural and morphological properties were investigated through scanning electron microscopy, X-ray diffraction, and ultraviolet spectroscopy. The obtained X-ray diffraction patterns showed that the synthesized AZO nanorods were exhibited a preferred orientation along the (002) plane and other peaks that correlated with zinc aluminate (ZnAl2O4) spinel nanorod also detected. Increasing time deposition and existence of aluminum was observed can influence a well-aligned growth and reduction in nanorod diameter size leading to increment on aspect ratio (ratio between length and diameter size). Topic: Condensed Matter Physics 33 The NIR Absorbance Properties of Carbon Nanoparticle Prepared by Hydrothermal Route: Time and Temperature Reaction DependenceFerry Iskandar1,3,*, Suci Khairani1, Akfiny Hasdi Aimon1, Fitri Aulia Permatasari2 and Prasiwi Handari Jati1 1 Energy and Environmental Materials Laboratory, Electronic Materials Division, Department of Physics, Faculty Mathematics and Natural Science, Institut Teknologi Bandung, Bandung 40132 2Department of Chemical and Engineering, Hiroshima University, Japan 3Research Centre for Nanoscience and Nanotechnology, Bandung, Indonesia Abstract Carbon Nanoparticle (CNP) is derivative of bulk carbon particle that has the unique properties such as good photoluminescence, good solubility in water, low toxicity, biocompatible, high chemical stability, has the broad absorbance, friendly environment and easy to be synthesized. Beacuse of its unique properties, there are many aplications to develop the CNP potential suchs as bioimaging, biosensing, optoelectronic device, photothermal agent and catalysts. In this research, CNP has been succesfully synthesized by hydrothermal method by varying the temperature and time reaction. The result showed that redshift phenomena in absorbansce depends on increasing the time and temperature reaction. In the optimal condition, the obtained CNP has the absorbance in 656 nm of center in absorbance wavelength. From the obtained result, it can be concluded that the variation of temperature and time reaction affect teh CNP? absorbance ability and the chemical bonding that consisted in CNP. Topic: Condensed Matter Physics 34 Effect of Microwave Duty Cycle on The Electrical Conductivity of Reduced Graphene Oxide (RGO)Ferry Iskandar1,3,*, Utiya Hikmah1, Oktaviardi Bityasmawan Abdillah1, Akfiny Hasdi Aimon1 , Dadang Suhendar2 1Energy and Environmental Materials Laboratory, Electronic Materials Division, Department of Physics, Faculty Mathematics and Natural Science, Institut Teknologi Bandung, Bandung 40132 2Electric and Magnetism Laboratory, Department of Physics, Faculty Mathematics and Natural Science, Institut Teknologi Bandung, Bandung 40132 3Research Centre for Nanoscience and Nanotechnology, Bandung, Indonesia ferry[at]fi.itb.ac.id Abstract Graphene as 2D material has attracted a lot of attention due to its fascinating properties. Chemical synthesis process is known as the simplest and easiest synthesis method to produce graphene by reducing the graphene oxide into reduced graphene oxide (rGO). Here in this paper, the reduction process of graphene oxide is assisted by microwave to speed up the heating process that make this method more efficient. The reduction process is done in ambient and under nitrogen atmosfer. The microwave duty cycle and time used as parameter to be observed into the electrical properties of rGO. The prepared samples were characterized using X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray spectrometry (EDX), Transmission electron microscopy (TEM) and four point probes. The highest conductivity obtained with microwave duty cycle 100% (high) in 3 minutes under nitrogen atmosfer reach 1810 S/m and dominated by ~90% of C atoms. Topic: Condensed Matter Physics 35 Spectral Distribution of Fano Interferences in Classical Damped OscillationP.M Widartiningsih, D. Rahmawati , A. Fitriana , A.M Yusuf, Irhas, M. Yunus Department of Physics Institut Teknologi Bandung Abstract We present the classical analogy of Fano interferences in helpful view to understand Fano behavior of phonons excitation as the interaction of two harmonic oscillators in damped oscillation system. In order to obtain more informative explanation, we demonstrate the coupled oscillator motions in javascript using numerical integration method of 4th Order Runga Kutta. A detailed discussion of Fano spectral distribution is shown by considering some varied oscillation parameters including natural oscillation frequency, damping factor, coupling constant, as well as applied external force. It is further shown that the oscillation phase-shift differs in those varied oscillation parameters. The range of allowed parameters values to get the appropriate results will be listed in this article. Topic: Condensed Matter Physics 36 Electronic Structure of Inorganic Alkali Lead Iodide APbI3 (A=Li, Na, K, and Cs) from Density Functional Theory (DFT) Calculation ResultsPina Pitriana, Triati Dewi Kencana Wungu, Herman and Rahmat Hidayat Physics Program Study, Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung; Physics Education Program Study, Faculty of Tarbiyah and Teacher Training, Universitas Islam Negeri Sunan Gunung Djati Bandung Abstract The electronic structure of inorganic alkali lead iodide APbI3?s properties are investigated by first-principles calculations based on Density Functional Theory (DFT) using Quantum Espresso. The alkali atom A in these perovskite structure is either lithium (Li), sodium (Na), potassium (K), or cesium (Ce). The calculation results show the effect of alkali atom on band gap and density of states (DOS) distribution, leading a variation in their electronic structure and electronic characteristics. Initial structure of all compound is cubic Pm3m framework structure of APbI3 where A is cation of alkali, such as lithium, natrium, kalium, and cesium. To obtain optimal result, the lattice parameter of APbI3 are changed through the scheme of vc-relax calculation in Quantum Espresso and also the optimization of kinetic energy cutoff and k-point. The using of pseudopotential type also give affect to total energy calculation, we used LDA and GGA both to be compared. Different alkali elements in perovskite compound tuning the electronic characteristics of the materials, such as their band gap and density of states. The band gap range from 1.39 eV ? 1.48 eV and there are no specific order for the change of alkali elements. From these calculations, we identify that inorganic alkali lead iodide show semiconductor properties, as also reported by other reports elsewhere. Three compound (LiPbI3, NaPbI3 and KPbI3) are potential to be used as solar cell absorber materials while CsPbI3 had been used as active materials in solar cells. Topic: Condensed Matter Physics 37 RHEED patterns of 1 nm carbon layer coated Si (111) surface using SputteringRisa Suryana, Dianisa Khoirum Sandi, Hitoshi Nakahara, Yahachi Saito Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Indonesia Department of Quantum Engineering, Graduate School of Engineering, Nagoya University, Japan Abstract In order to overcome the high cost of SiC substrates, researchers reacted carbon atoms and Si surface to obtain SiC layers on Si substrate since one decade ago. The SiC is best substrate to grow the graphene. In this research, 1 nm carbon layer was coated on Si(111) surface using Sputtering method. After RCA cleaning process, n-type Si(111) with resistivity 1.5-4.5 ohm.m was put into the main chamber then transferred into the growth chamber after the vacuum condition was attained. The carbon source was evaporated with plasma energy of 150 watt for 3 min to obtain about 1 nm carbon layer on Si(111) surface. The samples were characterized using ex-situ the reflection high energy electron diffraction (RHEED), the scanning electron microscopy (SEM) and the Raman spectroscopy. The sample was annealed at RT-1200oC while the evolution of RHEED pattern was observed using the cooled CCD camera. Amorphous pattern appeared at RT-700oC, combination of dot and ring patterns appeared at 800-900oC and finally Si(111)-7x7 appeared at 1200oC. Dot patterns was investigated as SiC structures. From SEM images, it is confirmed that triangle SiC formed on Si(111) surface. However, Raman spectroscopy did not show the SiC curve. It is assumed that SiC formed on Si (111) surface in the form of inhomogeneous triangular islands rather than in the form of layers so it cannot scatter many lasers. Topic: Condensed Matter Physics 38 Modeling of Electron Transmittance and Tunneling Current through a Trapezoidal Potential Barrier by Considering Spin Polarization EffectFatimah A. Noor*, Ezra Nabila, Hantika Mardianti, Tisa I. Ariani and Khairurrijal Physics of Electronic Materials Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia * Email: fatimah[at]fi.itb.ac.id Abstract A Modeling of transmittance and tunneling current through a trapezoidal potential barrier has been developed by taking into account a spin polarization of electrons. A transmittance was calculated by using Airy wavefunction approach and employing a zinc-blende material for the barrier in the heterostructure which depends on the spin states indicated as "up"and "down". The obtained transmittance was then used to calculate the tunneling current by using Gauss Laguerre Quadrature method. It was shown that the transmittance was not symmetric with incident angle of electron. It was also shown that the tunneling current increases with increasing the bias voltage and tends to constant for high voltage regime. Topic: Condensed Matter Physics 39 Critical point analysis of ZnO thin films on different electronic environmentsMuhammad A. K. Purbayanto1*, Rafi Ichwan1, Eka Nurfani1, Yudi Darma1* Department of Physics, Faculty of Mathematics and Sciences, Institut Teknologi Bandung, Ganesa 10 Bandung 40132, Indonesia Abstract We study the effect of different electronic environment on excitonic properties of ZnO thin films. The thin films were deposited on Si (Semiconductor) substrates and SiO2 (Insulator) layer using DC-unbalanced magnetron sputtering at room temperature. Optical properties of ZnO were determined by spectroscopic ellipsometry with energy range from 1.2 to 6.5 eV. The thin films were modelled by Tauc-Lorentz and Gaussian oscillators to obtain the complex dielectric function. In order to extract the excitonic properties, the dielectric function is analysed by critical point (CP) line shapes. We found that the excitonic state of ZnO on SiO2 is stronger and shifted to the lower energy comparing with the case of ZnO film on Si. In the case of ZnO on Si, we suggested that the electronic transfer occurs from Si substrate to the thin film after photon energy applied and then reduces the binding energy of exciton. Furthermore, this behaviour is analysed by number of effective electron (Neff) extracted from the dielectric function. In the band gap region, Neff spectra of ZnO/Si is higher than that of ZnO/SiO2. Our results reveal that the modification of electronic environments affect the excitonic properties of ZnO, which is important for optoelectronic applications. Topic: Condensed Matter Physics 40 Application of Ensemble Empirical Mode Decomposition to Noise Reduction in Seismic SignalArya Dwi Candra, Puput Eka Suryani Department of Electrical Engineering, Ronggolawe College of Technology (STTR Cepu), Jln. Kampus Ronggolawe Blok B No. 1 Mentul, Cepu, Blora, Central Java, 58315 Indonesia aryadcandra[at]gmail.com or aryadwicandra[at]sttrcepu.ac.id Abstract Earthquake waves are very complex three-component signals, requiring filtering methods that can filter three components signal simultaneously. A good seismic signal is a signal that is free of noise, both in the instrument noise and in the field noise. We develop an efficient filter method that can reduce seismic noise in three-component seismograms. The filter use ensemble empirical mode decomposition (EEMD) to decompose a signal into several intrinsic mode functions (IMFs). EEMD is highly adaptive and can be very satisfying in time-frequency characteristics of signals. The method requires no prior knowledge of the target signals. EEMD method was tested on synthetic data with different random noise level. The result shows that this method can reduce the seismogram of signal noise efficiently. This method is very effective to reduce noise, both on synthetic data and field data. Topic: Earth and Planetary Sciences 41 Gravity Survey in Pandan MountainEko Januari Wahyudi, Djoko Santoso, Ahmad F. M. Ulum Applied Geophysics and Exploration Research Group, Institut Teknologi Bandung Abstract Pandan Mountain is volcanic area located near Kendeng Zone in East Java, Indonesia. Pandan Mountain area, that becomes one of geothermal prospect in East Java, was impacted an earthquake event with 4.2 Richter scale on 25th June 2015 (10:35 AM local time). In this study, we conducted gravity survey in Pandan Mountain area to understand density subsurface. Data acquisition and processing are describe in detail to provide gravity anomaly map in this study area. The gravity anomaly then transformed into frequency domain to provide depth estimation of subsurface sources. We conducted subsurface modeling to find the interface density between hot-volcanic intrusion (modeled with low density) and background rock of pyroclastic layer (modeled with high density). The preliminary results of 2.5-D gravity inverse modeling shows that low density distribution up to 500 meters depth from the subsurface. Trend of low density distribution in the subsurface also found in the deeper depth in the Southern part of study area. Topic: Earth and Planetary Sciences 42 Preliminary Study on Electrical Properties of Hydrocarbon-Contaminated Soils at an Artisanal Oil Field in Central Java, IndonesiaEleonora Agustine1 , Dini Fitriani1, Wahyu Srigutomo2, Mia Uswatun Hasanah1, Anggie Susilawati1, Ilma Danandika Dimawani1, Teguh Deo Pambudi1, , Silvia Jannatul Fajar3, Trimadona2 1)Geophysics Dept., FMIPA Universitas Padjadjaran, KM 21 Jatinangor Sumedang 2)Physics Dept., FMIPA ITB, Jl. Ganesha 10 Bandung 3)Geophysics Engineering, FTTM, Jl. Ganesha 10 Bandung Corresponding author: leo[at]geophys.unpad.ac.id Abstract Investigation on hydrocarbon-contaminated soils at artisanal or traditional oil fields is a challenging task since the choice of an appropriate non-hazardous method is a must. Currently, the ground penetrating radar (GPR) method is widely accepted to apply in such a case. In this study we propose an alternative method in analyzing hydrocarbon leakage absorbed by soil. For years, local people operate this artisanal oil field and they often pour in the unused oil waste into the ground. Discrete measurements of electrical conductivity of core samples were conducted using Decagon EM 50 instrument. The samples were taken from an artisanal oil field near a state-owned oil field located in Central Java. The hydrocarbon-contaminated soils were compared to those taken from uncontaminated soils in the same area. Depth of the coring is 70 and it was sampled at every 5 cm to obtain its conductivity values. The natural-uncontaminated soils showed a maximum value of 0.65 dS/cm at 22 cm deep whereas the maximum conductivity value of the contaminated soil samples is 1.4 dS/cm at 31 cm deep. The results of this study indicate that the electrical conductivity values of the contaminated soils increase in contrast to what is expected where the introduction of hydrocarbon into soil will tend to decrease its electrical conductivity value since hydrocarbon is highly resistive. These results suggest that biodegradation may have been occurring in the contaminated soils for a considerably length of time Topic: Earth and Planetary Sciences 43 3-D Modeling of Time Domain Electromagnetics (TDEM) Method to Analyze the Layered Earth Structure in the Geothermal SystemsCahyo Aji Hapsoro(1*), Wahyu Srigutomo (1), Acep Purqon(1) (1) Earth Physics and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung *Email: cahyoajihapsoro[at]gmail.com Abstract 2-D Time Domain Electromagnetic (TDEM) has been successfully conducted to illustrate the resistivity distribution under the Earths surface. Resistivity is one of the physical properties which is very important to determine the reservoir potential area of geothermal systems as one of renewable energy. In this study we used Time Domain Electromagnetic method due to its advantages in solving EM field interaction problem on complex geometry and analyzing transient problems. TDEM method is used to model the value of electric and magnetic fields as a function of the time, distance, and depth. Resistivity values used in this model are adjusted to the real condition of the geothermal system specifically between 10-70 ohm.meter which is the resistivity range of the reservoir in a geothermal systems. The results of this modeling can be applied to describe the Earths subsurface resistivity values to determine the reservoir potential of geothermal systems. Topic: Earth and Planetary Sciences 44 Forward Modeling of Self Potential Time Series Response for DNAPL Detection in Closed AquiferHarry Mahardika, Neny Kurniasih, Muhammad Zaki, dan Aditya Fabio KK Fisika Bumi dan Sistem Kompleks Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Abstract Recent studies show significant electrical signals have been measured during water injection on the open aquifer, and on hydrocarbon production operations from a petroleum reservoir. The generation of electric signals come from the first two kilometers depth of the Earths crust, where the electrokinetic effect contribution is the most likely mechanism to explain the behavior of this measurable electromagnetic radiation. In geosciences, examples of applications utilizing these electrokinetic effects include the characterization of groundwater flows in porous rocks, oil and water production monitoring in reservoir operations, CO2 absorption in soil, and studies of diffusion of ionic species in saturated airborne clays used as parent formations for long-term safeguards Toxic wastes. In this study we simulate a monitoring mechanism for pollutants and toxins that can contaminate the communitys drinking water that are derived from a closed aquifers. We will use the self-potential (SP) method as the monitoring device that can detect electric signals from various physical ways beneath the surface. In the simulation will be use a forward modeling scheme for continuous model built on the numerical solution of the diffusion and Poisson equations. This continuous model will be adapted to represent the physical properties of the closed aquifer stream and the pollutant material going to the. The measured SP signals is coming from the pollutant stream in this aquifer. Topic: Earth and Planetary Sciences 45 Identification of Changes in Characteristics of Soil Physical Characteristics on Conditioned Land Caused by Excess Fertilizer Using Rock magnetism MethodAdinda Syifa Azhari, Eleonora Agustine,Dini Fitriani Geophysics Dept., FMIPA Universitas Padjadjaran Abstract Soil consists of various constituent elements, if the element is disturbed then the characteristics of the soil on the land will change. Factors that cause changes in the element one of them is inorganic fertilization activities that do not match the amount. Inorganic fertilizers are fertilizers derived from chemicals added to the soil. Basically the function of fertilizer is used to add nutrients in the soil but excessive inorganic fertilizing without being overlaid by organic fertilizer will cause the soil to lose nutrient and land damage. Thus, causing a decrease in soil productivity fertility. In this study, the object of the research is the farm land Ciwaruga Village with a case study of conditioned soil that given inorganic fertilizers and salt on agricultural land. The results obtained from this study were the susceptibility value (xlf) on soil exposed to inorganic fertilizers and the salt decreased compared with the original soil xlf 874.1 (x10-8m3 / kg -1), changed to 547.2 - 844.4 x 10-8m3 / Kg -1. This shows that there is a change in soil characteristics and decreased magnetic properties. In addition, based on the XRD (X-Ray Diffraction) analysis, the Anorthoclase mineral has been characterized by the change of soil properties and also the oxidation process in the soil is characterized by the change of magnetite minerals into hematite. Topic: Earth and Planetary Sciences 46 Geomagnetic Map of Field Camp Geophysics in Karangsambung using Data Acquisition 2005-2017Eko Januari Wahyudi and Dedi Sukmayadi Applied Geophysics and Exploration Research Group, Institut Teknologi Bandung Abstract The implementation of field activities in karangsambung geophysical engineering itb has been done since 1996 until 2017. During the field study activities, students conducted acquisition activities with several geophysical methods, one of the most consistent is the acquisition of geomagnetic data. Compilation of geomagnetic data during karangsambung field activities will be presented in this paper. There are 3 data categories for 19 times each years of geomagnetic survey: data compilation 1996-2004, 2005-2012 data compilation (geometric magnetometer & / scintrex), and data compilation 2013-2017 (scintrex magnetometer & gsm 19t sys). Geomagnetic observations around the base (LIPI campus) consisted of 2815 data showing geomagnetic field trends that decreased with a rate of change of -9 to -13 nT / year. Observations in Karangsambung field reaching an area of ​​80 km square are used as reference values​​/datum observations at the base station. Furthermore, each observation data from data compilation 2005-2017 (3118 data) scattered in karangsambung area is reduced to the reference datum. Contour map of total intensity in the Karangsambung field is in the range of 44000 to 46200 nT. Some locations with dipole anomaly patterns can be shown to correspond with magnetic lithology of rocks, such as gunung parang, dakkah and bujil. Topic: Earth and Planetary Sciences 47 Distribution of solar energetic particles and magnetic field orientations related to strong geomagnetic storms in solar cycle 24Dhani Herdiwijaya Astronomy Division and Bosscha Observatory, Institute Technology of Bandung Abstract Based on hourly data of solar energetic particles (velocity and density), interplanetary magnetic field (IMF) Bz component, and derived IMF orientations, e.g. IMF cone angle and clock angle. We studied their relations with 155 intense geomagnetic storm (Dst index less than 100 nT) during years 2009 to 2016 of solar cycle 24. It is suggested that strong geomagnetic storm related to southward, negative, and perpendicular IMF Bz. However, strong storms is not correlated with fast proton speed, which is aligned with radial or parallel IMF cone angle. In the future, we can used those derived equations for prediction of solar storm. Topic: Earth and Planetary Sciences 48 Development of Data Acquisition Instrumentation and Inversion System for Earth Resistivity Survey in a Smart Integrated SystemIhsan Imaduddin, Wahyu Srigutomo, Enjang Jaenal Mustopa Departement Fisika, Institut Teknologi Bandung Abstract This research has developed an integrated system of data acquisition and inversion process for earth dc resistivity survey in smart and compact instrumentation. Data acquisition system was developed based on microcontroller which is embedded to a PC. The microcontroller will choose the appropriate electrode sensor by command of PC . The data of a measurement and its electrodes configuration will be saved in PC. Once the data acquisition process is complete, automatically the system will start the inversion process based on finite difference method. Finally, the result of survey process will be shown in a 2D cross section image. Topic: Earth and Planetary Sciences 49 Comparing Two Models of Mapping the Peak Ground Acceleration (PGA) in Western JavaTati Zera, M. Nafian Physics Dept. FST UIN Syarif Hidayatullah Jl. Ir. H. Juanda No. 95 Ciputat, Jakarta Abstract Abstract. West Java is an area located in the subduction zone of two major plates of the world, Indo-Australian and Eurasian plates that cause high tectonic activity. This is marked by the number of earthquake events in that area. The accumulation of earthquake-induced shocks produces a ground movement. One of them is Peak Ground Acceleration (PGA). This research was conducted to compare two models of Peak Ground Acceleration (PGA), Esteva and Donovan. The models based on 50-years of catalog earthquakes event in period 1965 Topic: Earth and Planetary Sciences 50 Landslide Investigation and Back Analysis of Slide Plane Using Integrated Multidisciplinary ApproachMatheus Souisa1*), Lilik Hendrajaya2, Gunawan Handayani3 Department of Physics, Faculty of Mathematics and Natural Sciences, Institute of Technology Bandung, Indonesia Abstract It has been used many methods for studying the problems of landslides from the point of view of the one-discipline, interdisciplinary and multidisciplinary. Several methods are being developed to be integrated in the investigation of landslides over the past decade, the focus of studies directed to use a multidisciplinary approach to determine the potential landslides that can provide landslides mitigation. It has been used many methods for studying the problems of landslides from the point of view of the one-discipline, interdisciplinary and multidisciplinary. Several methods are being developed to be integrated in the investigation of landslides over the past decade, the focus of studies directed to use a multidisciplinary approach to geoelectric, geotechnical and geochemical to determine the potential landslides that can provide landslides mitigation. The research result showed the occurrence of slide plane (rotation slide type) in the Amahusu landslide. There is a slip plane due to contacts between clusters of medium rock (clay sand) and high rock groups (bedrock), caused by rainwater infiltration and increased groundwater pressure mobility and weathering of rocks. This is indicated by the value of the slope safety factor, Fs = 1.04 when the normal water level, and the water level increases Fs = 0.81. In the landslide location it is possible to have potential for subsequent landslides. The decrease of slope stability is influenced by the rising of ground water level. To increase the strength of the slope, reinforced at the top of the slope is 2 m from the crest with borepile (Fs = 1.13). If the shear strength increases linearly with depth, the safety factor only increases by decreasing the slope height. Topic: Earth and Planetary Sciences 51 The Variance Formation of M9.3 Solar Type V Burst Occurred at 8 Different Sites of the CALLISTO System on 4th August 2011Z. S. Hamidi, S.N.U.Sabri , N. N. M. Shariff Universiti Teknologi MARA, Malaysia Abstract Strong solar activity has occurred on 4th August, 2011 which involved the active AR1261 with ejection of M9.3 class of flares which almost exceed the X-territory which most powerful kind that can damage our satellite system. During that day, Type V burst was identified occurred with present of Coronal Mass Ejection (CME) towards earth, which moving estimated about 1950km/s which can gives major impact to our Earths in terms of satellites and several data has been collected in Radio Flux Density image credited to the space weather website at 8 different sites that gave different intensity of solar radio burst due to different antenna pointing into different sky position and different pre-amplifier used. The solar radio burst was occurring at 21.1 MHz at 3 minutes (0358 UTC till 0401 UTC). It also noted that all the sites are less suffering from local RFI with solar wind speed and density reached 411.6 km/sec and 3.8 proton/cm3. The radio sun is about 120 SFU. Solar Radio Burst Type V is known as smooth with short-lived continuum which sometime followed by a type III burst. It has difference in frequency range between 10-200MHz and only took about 1 to 3 minutes compared with type III burst that was fast frequency drift bursts that can be occurred in three forms, singular, in groups or storms, but sometimes it can accompanied by a second harmonic and has a duration of burst longer than Type V burst and has a wide range of frequency, 10KHz-1GHz. Topic: Earth and Planetary Sciences 52 Seismic Attenuation Improvement With Tree Plantation SchemaRia Lestari Moedomo DhoMiri Research Firm Bandung, Jawa Barat, Indonesia dhomiri33[at]gmail.com Abstract This preliminary study is a continuation of research with title: Geological Information System for Volcanic Conservated Forrest Planning, Case Study: Colo Mount, Una- Una Island. In this research, the hypothesis drawn is the following statement: the conservated forrest vegetation (especially the trees root part) which reaches the earth crust 500m-1km beneath the earth surface, may strengthen the soil/land seismic attenuation capacity, especially the shallow tectonic earthquake (earthquake with hypocentrum around +33km beneath the earth surface, but remains the most dangerous earthquake and has the highest potential damage to the earth surface). Especially Colo Mount, because the Colo eruption in July 23rd 1983 is triggered by a series of tectonic earthquake which occured before the Colo eruption happened in this date (from Prof.Katilis findings), then the vegetation condition around Colo Mount in Una-Una Island should have been able to reduce the tectonic earthquake impact towards the volcanological process of Colo Mount eruption. If the intensity of tectonic activities can be reduced as much as possible, hopefully the volcanic eruption impact of Colo Mount can be reduced. Topic: Earth and Planetary Sciences 53 Responses of Ionosphere Above Pontianak And Tanjung Sari to The CME Event. (Study Case of CME Event on November 7th, 2013)Newton Jefons (a*), Dhani Herdiwijaya (a), Jiyo (b) a) Astronomy Study Program, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia newtonjefons[at]gmail.com b) Lembaga Penerbangan dan Antariksa Nasional Jalan Dr. Junjunan 133. Bandung Abstract Sun is the main source of space weather dynamic trigger. Solar activities take control to keep the environment of the Solar system. Some Solar activity is Sun spots, flare events, coronal holes and coronal mass ejection (CME). These activities are connected one another and some time could occur simultaneously. CME is one of the Solar activities caused by the mass of the Sun ejected out from the corona to the interplanetary space. And not only that sometime CME could disturb the environment of the Earth. On of the disturbance caused by CME is the anomaly of F2 layer on Earths ionosphere. In this research, the study case about the anomaly of Ionosphere caused by the CME event on November 7th, 2013 had been done and analysis result shows that there is a delay time of the anomaly for two places (stations) at the different latitude, Tanjung Sari and Pontianak. It can be concluded that the region above Tanjung Sari is more sensitive than the region above Pontianak, marked by the significant decreasing of foF2 values at Tanjung Sari. Topic: Earth and Planetary Sciences 54 Relation of crustal and upper mantle deformation beneath Sunda-Banda Island Arc inferred from shear-wave splitting analysisSyuhada Syuhada, Nanang T. Puspito,Titi Anggono, Nugroho D. Hananto, Hendra Grandis and Tedi Yudistira Research Centre for Physics - Indonesian Institute of Sciences (LIPI), Tangerang Selatan, Indonesia Faculty of Mining and Petroleum Engineering, ITB, Bandung, Indonesia Research Centre for Geotechnology-LIPI, Bandung, Indonesia Abstract We study the possible correlation of deformation in the crust and upper mantle beneath Sunda-Banda Island Arc using shear wave splitting analysis. The study area is very complex and located in the region where there is a transition in tectonic setting from subduction to collision. In this study, we measure the upper mantle splitting parameters from local events recorded at 6 broadband stations. The fast directions of the upper mantle splitting results are then compared with the orientation of fast waves previously obtained in the crust. The results show that the upper mantle fast orientations are generally parallel to the crustal splitting pattern. Thus, this finding indicates the possibility of vertical coherent deformation between the crust and upper mantle in this area. Our initial interpretation is that this pattern could be related to the geodynamical process due to the change of tectonic regime from subduction to collision, which involves high stresses and strains in the plate boundary. Topic: Earth and Planetary Sciences 55 Geochemical Characteristics of Volcanic Rocks from The Mt.Masurai"s Caldera, Jambi, Indonesia1) Asep Rohiman*, 1)Dipowiguno Prijanto, 1)Arief Prabowo, 1)Antonius Ratdomopurbo, 1)Ruly Setiawan, 1)Mutiara Effendi, and 2)Eko Wahyudi 1)Center For Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources Jl. Doponegoro No.57 Bandung 40122, Indonesia 2) Bappeda Kabupaten Merangin Jl. Jend. Sudirman No. 01 Bangko, Provinsi Jambi, Indonesia *email : asep.rohiman[at]esdm.go.id Abstract The Mt.Masurai is one of the volcanoes in Jambi, Indonesia. But, the literature about The Mt.Masurai is still limited until now. The study of the volcano is important as early detection of natural disasters, such as volcano eruption and earthquake. Through comprehensive research, the eruption period of the volcanoes can be predicted and maximum precaution can be planned to minimize disaster victims. In this work, we reported the study of The Mt.Masurai"s geochemical rocks. A total of 120 rock samples were characterized using XRF ARL 9900 for the major elements. Then, the trace elements and rare earth metals were characterized using ICP-MS. Paleosol and carbon samples were dated using carbon dating instruments. Based on the results, we obtained a type of rocks from the geochemical classification are basalt, basaltic-andesite, andesite, dacite, and rhyolite. The rocks spread from south to north of the Mt.Masurai"s Caldera. The age of the Mt.Masurai"s north rocks is 29 ka BP while the age of the Mt. Masurai"s southern rocks is 17.7 ka BP. The Mt.Masurai eruption has undergone two eruption period until now. Topic: Earth and Planetary Sciences 56 Optimalization of ultrasonic tomography method using robotic instrumentFatkhan, Tedy Setiawan, Fernando Lawrens Program Studi Teknik Geofisika, FTTM, Institut Teknologi Bandung Abstract Ultrasonic tomography is one of many non-destructive methods to image a rock by measuring wave velocities (P or S-wave). Some applications of ultrasonic tomography include research for seismic anisotropy, rock physics, shale gas etc. As we know that a conventional method are still employed to measure wave velocities in ultrasonic tomography. The conventional method measures a rock manually that it is often difficult and sometime takes quite long time. One of alternatives to cope with the problem is to make a robotic instrument. The robotic instrument is made of microcontroller and stepper motor. The microcontroller and stepper motor control the position of ultrasonic transducer while measurement of the rock sample. The robotic instrument is not only able to measure but also have feedback control. As a result, measured data can be more accurate and precise than those of the conventional method. Several rock samples are used for testing measurements using a MSIRT (Modified Simultaneous Iterative Reconstruction Technique) method. Comparing results include error measurements that are shown in graph and table. Results show that using the robotic instrument can enhance quality of data and reduce error up to 50%. By using the conventional method percentage of errors ranges from 0.23% to 19.71%; whilst using the robotic instrument becomes 0.05% to 7.86. Topic: Earth and Planetary Sciences 57 Identification of Structural Trap of Hydrocarbon Reservoir below The Layers of Volcanic Rocks using Audio-Magnetotelluric Method in Majalengka RegionMuhammad Thowwafi Alfiansyah (a), Supriyanto (a) a) Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia Abstract Exploration of hydrocarbons beneath the volcanic rock becomes a great challenge to increase oil and gas reserves in Indonesia. In this study, Audio-Magnetotelluric method is used for mapping structural trap of hydrocarbon reservoir because the mapping using seismic waves do not produce good data on the area of volcanic rock. Geophysical surveys with audio-magnetotelluric method (AMT) is used to determine the condition of the subsurface based resistivity values and phase values. The raw data in the form of time series data from the measurement results using the equipment units Phoenix Geophysics. Then the data is processed further in the form of apparent resistivity and phase curves toward frequency. Processing data carried out various filtering and correction. The end result is two-dimensional cross-section of the measurement line AMT. Data from the model AMT is interpreted in an integrated manner with geological data. The results showed a good enough relationship between data AMT with geological data. Interpretation of the results can be seen that there is a fault zone in the area of measurement and bedding known formations that form a petroleum system. Cinambo Formations act as the parent rock and hydrocarbon reservoir that led to the migration of the primary in one formation, while Kaliwangu Formations act as a cover seal rock. Hydrocarbon trap type is structural trap because there is fault zone in the area of measurement. Topic: Earth and Planetary Sciences 58 Distribution of Magnetic Susceptibility of Natural Iron Sand in Sarmi Coast AreaOctolia Togibasa 1), Muhammad Akbar 1), Aditya Pratama 2), Satria Bijaksana 2) 1) Department of Physics, University of Cenderawasih, Jayapura, 99358, Indonesia 2) Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 50132, Indonesia Abstract Iron sand, a raw source of magnetic materials, were known spread in particular area in Indonesia. However, researcher mostly focused on the iron sand source from western coast of Sumatera and southern coast of Java while the northern coast of Papua has not been identified yet. In this study, iron sand samples were collected from the coastal area of Sarmi in the northern coast of Papua Province encompassing between these geographic positions 1o4752.30"S - 138o4027.60"E and 1o5757.50"S - 138o577.60"E. Magnetic susceptibility measurements on these samples show that some of them, especially from Holmafen beach, are quite magnetic with mass-specific magnetic susceptibility varies from 0.7 to 4.3 x 10-5m3kg-1. Iron oxides are expected to be the main magnetic minerals in those iron sand samples. Distribution of magnetic susceptibility values for all samples will be presented along with the mineral compositions of several anomalously magnetic samples. Topic: Earth and Planetary Sciences 59 Vulcanism and Anomaly of geothermal heat flow in northern of East Java islandBagus Endar B. Nurhandoko1, Rizal Kurniadi1, M. Rizka Asmara Hadi2, Rio Martha2, Sri Widowati3 1) Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung 2) Rock Fluid Imaging Lab 3) School of Computing, Telkom University Abstract East Java contains present-day active vulcanics arc in the southern part, thrusting fault surround carbonate mountain of Kendeng zone in the middle part, and Rembang Hills region in the north. It is usually the high geothermal heat flow surround the volcanic activity. The present-day active vulcanics arc is in the southern part of East Java. We collected hundreds subsurface temperature data from various wells: in deep and shallow wells in these zones including surveyed tens hot springs in the northern part of East Java islands. Geothermal heat flow is the important parameter in various exploration objects: hydrocarbon as well as geothermal exploration. Much of the heat flow is created by the decay of naturally radioactive elements and crust dynamics. The high geothermal heat flow is often closely linked to vulcanism. The other possibilities of high heat flow may be caused by several phenomena, i.e.: frictional heating of faults or buried vulcanic?s activity. The geothermal heat flow can be estimated using temperature gradient and thermal conductivity of rock. We use a special tool for measuring the gradient of temperatures of wells. Tens of wells have been measured their gradient temperatures, from southern part to the northern part of East Java Island. And we collected thermal conductivity of rock in each formation. In this paper, we present the anomalies of geothermal heat flow including hot springs in the northern part of East Java island which is very far from the row of active volcanic in the southern part of East Java. In the north part of East Java, some of vulcanic?s activity still exist today; there are many hot springs, sulfur pools, and some outcrops of lahars and lava rock. Topic: Earth and Planetary Sciences 60 Photospheric Magnetic Field of Active Regions During Flare in Solar Minimum of Cycle 24Agustinus Gunawan Admiranto, Rasdewita Kesumaningrum, Muhamad Zamzam Nurzaman Space Science Center, Indonesian National Institute of Aeronautics and Space (LAPAN) Abstract We analyzed photospheric magnetic fields of active regions in the minimum of cycle 24 which produced strong flares. We used HMI data onboard SDO satellite, and compared the total unsigned flux, total unsigned vertical current, and total unsigned current helicity of the magnetic fields with other characteristics, i.e. the areas, McIntosh classification, and Hale?s class of the active regions. The preliminary results showed that the occurrences of flare maximum were not coincided with the maximum values of the abovementioned magnetic parameters. Topic: Earth and Planetary Sciences 61 Magnetic Characterization of Industrial Dust from Gresik, East Java, IndonesiaTitis Lestyowati, Silvia Jannatul Fajar, Satria Bijaksana Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia Abstract Industrial dust has been known to be potential health hazard and therefore need to be closely monitored. However, in heavily industrialized area such as Gresik in East Java, Indonesia identifying the source of particular dust or differentiating one type of dust to another might be complicated. In this study, industrial dust in the form of fly ash, cement dust and lime kiln dust from various industries in Gresik were analyzed for their magnetic properties. The measurements include magnetic susceptibility, thermomagnetic as well as ARM (anhysteretic remanent magnetization) decay curves. To complement these measurements, the samples were also subjected to SEM (scanning electron microscopy), XRD (X-ray diffraction) and XRF (X-ray Fluorescence) analyses. The results show that each industrial dust has its own magnetic characteristics. For instance, fly ash has the highest Fe-content and therefore is the most magnetic. The predominant magnetic mineral is spherule-shaped magnetite. As magnetic methods are simpler that other types of analyses, they are very prospective to be used as alternative methods for industrial dust pollution. Topic: Earth and Planetary Sciences 62 Magnetic characterization of pyroclastic density current (PDC) of the AD 1257 eruption of Mt. Samalas, Lombok, Indonesia: preliminary resultsArif Wijaya, Silvia Jannatul Fajar, Satria Bijaksana Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia Abstract The 1257 AD Mt. Samalas eruption (Lombok, Indonesia) is one of the major volcanic eruption that cause global climate change and ejected thick layers (50 m) of pyroclastic density current (PDC). In this study, this PDC deposits from two different locations, namely Luk and Jugil, in northern coast of Lombok were subjected to series of magnetic measurements that include mass-specific magnetic susceptibility, isothermal remanent magnetization (IRM) saturation, anhysteretic remanent magnetization (ARM) decay as well as hysteresis parameter. Prior to magnetic measurements PDC samples were sieved through to divide the samples in five different grain sizes, i.e., clay, silt, fine sand, coarse sand and granule. Magnetic measurements were carried out for each grain size. The results show that the predominant magnetic mineral in all samples is PSD (pseudo-single domain) and MD (multi domain) magnetite. However, the mass specific magnetic susceptibility of clay size samples from Luk (~ 501 ? 10−8 m3/kg) differ significantly from that of Jugil (~ 848 ? 10−8 m3/kg) suggesting that although the deposits from Luk and Jugil were of the same sources, they likely to came from different eruption events. So far, the concentration dependent magnetic parameter, i.e., mass-specific magnetic susceptibility is still the best parameter to identified PDC deposits of Mt. Samalas based on their eruptive events. Topic: Earth and Planetary Sciences 63 A comparative Study of Simulated Annealing and Genetic Algorithm method in Bayesian framework to the Gravity data inversionadam sukma putra, Sukono, Wahyu Srigutomo Universitas Padjadjaran Institut Teknologi Bandung Abstract The use of modern optimization method in geophysical inversion has effectively given a robust global solution in its application to solve a complex non-linearity problem. Here, we tested two artificial intelligent-based methods, the simulated annealing and the genetic algorithm to the gravity data. Using predicted anomalies geometries, these methods are addressed to invert a synthetical gravity data extracted from grav2d open source. Differences between these methods are observed in both single parameter inversion and simultaneous multi parameter inversion to evaluate the speed of computing and the use of Space in memory. The result give us an idea that the genetic algorithm are slower than the simulated annealing in solving a simple inversion problem (small data set and less parameter to be inverse) but efficient in a large data set. meanwhile, the simulated annealing faced some problem in locating a global minima of the misfit function for the large data. in the latter case, we simulated the methods in the bayesian framework to see the distribution of posterior probability of the parameters. Topic: Earth and Planetary Sciences 64 The Physical Mechanisms of Geothermal Reservoir During Hydraulic Injection Through Microearthquake TomographyKana A. Natania(a),David P. Sahara(b), Andri D. Nugraha(b) , Irvan Ramadhan(c) (a)Undergraduate program of the Geophysical Engineering, Institut Teknologi Bandung, Ganeca 10, Bandung, Jawa Barat, Indonesia (b)Global Geophysics research group, Institut Teknologi Bandung, Ganeca 10, Bandung, Jawa Barat, Indonesia (c)PT. Supreme Energy, Menara Sentraya floor 23th, Jakarta, Indonesia Abstract Understanding the physical mechanisms which are involved during hydraulic stimulation is the key parameter to estimate the fluid flow and permeability increase within the geothermal reservoir. An attempt to infer the mechanical behavior of the XO geothermal reservoir during injection is performed in this study. XO geothermal field is located in Indonesia and is a volcanic type geothermal. In this geothermal field, several geophysical data acquisition such as microseismic and magnetotelluric method has been performed. As we know, microseismic is a key method for monitoring the percolation of the fluid within reservoir during the injection activity. The recorded microearthquakes can provide important information. In this study, we aim to determine the 3D seismic velocity structure of the XO geothermal reservoir using microseismic tomography as well as analyze its mechanical changes due to hydraulic injection using the evolution of the microseismicity. The authors use the microseismic data from 13 and 16 stations deployed before and after the injection, respectively. A total of 2.827 microseismic events were recorded from 2010 to 2013, in which only 135 microearthquakes were recorded before injection and significantly increased to 2,692 events after hydraulic fracturing. Therefore, it can be concluded that the injection significantly alter the mechanical state within the reservoir. To analyze the mechanical behavior of the reservoir, first the hypocenter location accuracy must improved by using a cross correlation master technique. Then hypocenter relocation as well as the velocity structure is produced using TomoDD software. We use tomographic double difference inversion to determine the structure of Vp, Vs and the ratio Vp /Vs. The results of the 3D velocity model together with the microseismic propagation can be used to analyze the changes in mechanical behaviour that occur in the reservoir during and after the hydraulic injection. Topic: Earth and Planetary Sciences 65 Magnetic characterization and heavy metals pollutions of sediments in Citarum River, IndonesiaSudarningsih, Hana Aliyah, Silvia Jannatul Fajar, Satria Bijaksana Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia Abstract Magnetic methods have been successfully used for pollution detection and mapping in riverine environment. These methods are considered faster and easier compared to conventional analytical methods. In this study, sediment samples from Citarum River, the largest river system in West Java Province and main water supply for more than 10 million people, were measured for their magnetic characteristics and heavy metals content to test the effectiveness of magnetic methods in detecting heavy metals pollution. Magnetic measurements include measurements of magnetic susceptibility (MS), isothermal remanent magnetization (IRM) saturation, and anhysteretic remanent magnetization (ARM) decay. The results show that mass-specific MS values tend to decrease from upstream to downstream, from 1127.3 to 432.43 ? 10−8m3kg⁻?. In all samples, the dominant magnetic mineral is found to be magnetite based on the IRM saturation field. The magnetic grains are predominantly multi domain (MD). Geochemical analyses showed that all water and sediment samples contain Fe, Cd, Co, Ni, Pb, Zn, As, Hg, and Mn that are higher than the safety threshold. Cu content (both in water and sediment) and Ag content (in sediment), however, are still below safety threshold. The heavy metals content varies irregularly in sediment samples although a negative correlation is found between heavy metals contents and magnetic parameters. Topic: Earth and Planetary Sciences 66 Investigation of Mesoscale Convective Systems over Indonesian Maritime Continent using Geostationary Meteorological SatelliteY Norman(1,2*), NJ Trilaksono(3,4) 1) Graduate Master Program of Earth Science, Institut Teknologi Bandung, Indonesia 2) Meteorological, Climatological, and Geophysical Agency, Indonesia 3) Atmospheric Science Research Group, Institut Teknologi Bandung, Indonesia 4) Weather and Climate Prediction Laboratory, Indonesia Abstract Variation of Mesoscale Convective Systems (MCSs) over Indonesian Maritime Continent (IMC) for 5 years in 2010-2014 were investigated using implementation of graph theory with hourly product from geostationary meteorological satellite infrared brightness temperature and Tropical Rainfall Measuring Mission (TRMM) precipitation data. Variations of MCSs are analyzed based on six criteria of convective cloud organization derived from area, duration and eccentricity characteristics. The result shows that monthly average of six types of MCSs in the IMC region forms a bimodal pattern with two peaks at March to May (MAM) and September to November (SON). A statistical analysis exhibit a maximum frequency occurrence of six types of MCSs in the region of equatorial rainfall type, which amount of events up to 40% or 787 times/year, where the greatest contribution concentrated in the Indian Ocean, Sumatra, Kalimantan, Sulawesi and Papua. Diurnal pattern of MCSs in the IMC shows maturity time of MCSs mostly occurred in the evening to early morning. The typical occurrence of MCSs in this study is different compared to United States and China types, whereas IMC has balanced proportion amounts between linear and circular shape types, while United States and China region were dominated by linear type. Topic: Earth and Planetary Sciences 67 The Recent Small Earthquakes around Lembang Fault, West Java, Bandung, IndonesiaA D Nugraha1, P Supendi2, B S Prabowo3, S Rosalia3, Erlangga3, Y M Husni3, S Widiyantoro1, N T Puspito1, A Priyono1 1Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia 2Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG), Indonesia 3Geophysical Engineering, Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia Abstract Abstract. On May 14th and 18th, 2017 felt earthquakes were occurred around western part of Lembang area, Bandung, West Java, Indonesia with magnitude of M2.8 and M2.9, respectively. The first earthquake (M2.8) was felt by some people around epicenter area. We determined the earthquake location through re-picking of P-and S-wave arrival time recording by Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG), network. Earthquake location was determined by using Hypoellipse code that employs a single event determination method. We also conducted focal mechanism analysis to estimate the type of fault slip. The results indicate the hypocenters location in the north and south of the western part of Lembang fault with the focus depth of ~ 5 km, respectively. Source mechanism solutions showed the type of earthquake is strike-slip fault. The occurrence of two recent small earthquakes need more attention about the activity of Lembang fault. The destructive earthquake related to displacement of the fault occurred on August 28, 2011 (M3.3) located at the western end of the Lembang fault. For further study, we have been deploying 6 temporary seismometers stations around Lembang fault in attempt to detect small events and to delineate subsurface seismic structure by applying tomography method. Topic: Earth and Planetary Sciences 68 Testing the Effectiveness of Mechanical Magnetic Extraction in Riverine and Lacustrine SedimentsGesti Cita Novala, Sudarningsih, Kartika Hajar Kirana, Silvia Jannatul Fajar, Mariyanto, Satria Bijaksana Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia Abstract Rock magnetic studies often require analyzing extracted magnetic grains so that the mineralogy, granulometry, and concentration of magnetic minerals could be determined accurately. Magnetic extraction is often cumbersome, tedious, and subjective as this process is carried out manually by placing strong magnet inside sediment slurries. Moreover, the magnetic mineral content in sediment is generally much less than 1% of its weight. In this study, the effectiveness of mechanical magnetic extraction using magnetic stirrer is tested for riverine and lacustrine sediments. The samples are sediments from Brantas River in East Java and from Citarum River in West Java as well as surface sediment from Lake Towuti in South Sulawesi. The effectiveness tests were carried out by comparing the magnetic properties of bulk samples with that of extracted magnetic grains. Additional tests were also carried out in the form of SEM (scanning electron microscopy) and XRD (X-Ray diffraction) analyses. Apart from the expected higher values of mass-specific magnetic susceptibility, the extracted samples also tend to have larger magnetic grains than that of bulk samples. The predominant magnetic mineral in bulk and extracted samples is magnetite, although other type of magnetic minerals might be present in extracted samples. The presence of SP (superparamagnetic) grains in extracted samples is also negligible unlike that in bulk samples. SEM and XRD analyses support these findings. Magnetite grains could easily be identified in extracted samples. Topic: Earth and Planetary Sciences 69 Site Classification in Surakarta City Based on Vs30 of Multichannel Analysis of Surface Wave MethodMuhammad Fachrul Rozi Kurniawan, Sorja Koesuma, Budi Legowo Physics Departement, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Surakarta, Indonesia Abstract The Multichannel Analysis of Surface Waves (MASW) method is one of the non-invasive methods that can be used to determine the shear wave velocity. The shear wave velocity can be obtained from the inversion of dispersion curve of the Rayleigh wave. The surveys has done at 10 sites in Surakarta city. Active MASW measurements are performed by using the P.A.S.I. Seismograph Mod. 16S24-P. Geophone used as many as 24 channels with a frequency 4.5 Hz of the vertical component and 10 lbs hammer as active source. Every receiver spread is given once shot point at 5-10 m from first geophone . The measurement data is transformed to frequency domain by using Fast Fourier Transform (FFT) algorithm. The average shear wave velocity up to 30 m depth is referred as Vs30. The results shows that Vs30 of Surakarta city varies between 250-470 m/s. Based on the National Earthquake Hazard Reduction Program (NEHRP) classification, this values is classified as C and D class. The highest Vs30 values at the southwest (Laweyan site) is 464 m/s and the northern (Banjarsari site) is 434 m/s classified as site class C. Meanwhile, the lowest Vs30 values at the northwest and southeast (Serengan and Pasar Kliwon sites) classified as D class. Topic: Earth and Planetary Sciences 70 Space-Time Spectral Analysis of 2-D Signal on the Globe Using Spherical Harmonics and Wavelet Transform MethodsSefri Ayuliana, Faiz R. Fajary, Tri W. Hadi Program of Earth Sciences, Bandung Institute of Technology Abstract In this research, a method to analyze wave-number and frequency spectra from time series of global 2-D geophysical data has been developed. Spherical Harmonics (SH) transform method is used to analyze wave structures in both longitude and latitude, while the temporal evolution of frequency content in the data is analyzed using complex wavelet transform. The frequency spectra of longitudinally propagating waves are separated into their westward- and eastward components by wavelet transforms of the corresponding to complex SH coefficients and their complex conjugate. The method was applied to analyze daily OLR (Outgoing Long-wave Radiation) data of 27 years record (1987-2013) as a proxy for large-scale convective pattern. It proved that the method enable us to identify the existence of various wave structures representing the convectively coupled planetary atmospheric waves. As SH and wavelet transform methods are generic tools for signal analysis, our space-time spectral analysis method should also be applicable to other geophysical data whose properties are characterized with embedded planetary scale waves. Topic: Earth and Planetary Sciences 71 Modeling the behavior of CO2 injection in a sand reservoirCahli Suhendi*, David P.Sahara**, Fatkhan***, Mohammad Rachmat Sule*** *Geophysical engineering, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung ** Global Geophysics Research Group, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung *** Seismology, Exploration and Engineering Research Group, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung Abstract Injection CO2 into subsurface formation changes in-situ pore pressure and temperature which in turn alters the effective stress condition. An attempt to analyze the geomechanical responses induced by CO2 fluid injection in a sand reservoir is performed on this study. We develop coupling program code that linking two existing and proven programs, TOUGH2 and FLAC3D. TOUGH2 is a numerical simulator that solves fluid-flow and transport equation, whilst FLAC3D is a numerical code to simulate geomechanical analysis. Fluid ? flow and geomechanical equations are sequentially solved by using finite difference methods. The coupling method used in this paper is two ? way coupling where the coupling parameters are transferred from each code in certain time step. Simulation parameters are, then, extracted from geophysical and geological data conducted in the study area. The sensitivity test is performed by varying the injection and reservoir geomechanical parameters. The distribution of the injected CO2 plumme and the possible rock deformation induced by injection is shown for several injection case. Furthermore, a correlation between the injection strategy and the reservoir stability is drawn from the results of this study. This model could be applied to other field and serve as a basis information for the injection strategy. Topic: Earth and Planetary Sciences 72 3D Vp, Vs, And Vp/Vs Microseismic Tomography Imaging On "MA" Geothermal Field: Fluid Saturation Condition EstimationDonny Satrio Mahartha (a*), Andri Dian Nugraha (b), Mohammad Rachmat Sule (c) a) Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia *donny.satrio023[at]gmail.com b) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia c) Exploration and Engineering Seismology Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia Abstract "MA" Geothermal Field is located 35 km south of Bandung, West Java. This field lies on andesitic volcano highlands formed in the center of Sunda Arc. "MA" Geothermal Field has transition system between vapor-dominated and liquid-dominated. The reservoir characteristic has been changed over time caused by injection and production operation. Micro earthquake activites in geothermal field may relate to changes in stress and fractures occurrence. In this study, we use P-and S-wave arrival time of microearthquake and update these picked phases using waveform cross correlation as input for tomography inversion to delineate 3D seismic velocity (Vp, Vs, Vp/Vs ratio) around the reservoir and to detect steam and/or fluid zone. In this research, 877 microearthquakes data recorded in 15 seismometers from January-November 2016 will be used. We use VELEST software to get hypocenters relocation and 1-D velocity adjustment. The updated data from this software then becomes input for SIMULPS12. In this software, 308 data with good coverage are used. The preeliminary results are one-dimension seismic velocity structure and hypocenters around the reservoir. Hypocenters distribution indicates that the micro earthquake activities in this field are caused by geothermal activity. The results will be presented in more details during the meeting. Topic: Earth and Planetary Sciences 73 The pattern of local stress heterogeneities along the central part of the Great Sumatran faultDavid P. Sahara, Sri Widiyantoro Geophysical research group, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132 Abstract Based on world stress map, the in-situ stress along the Great Sumatran fault is assumed to be strike-slip, and the maximum principal stress SHmax is oriented N15?E. However, this estimation neglects the local impact of fault branching and material heterogeneity which might have a significant impact on the stress heterogeneity. Despite its importance, very few studies have been performed on this issue in the Sumatran fault. We intend to analyze significant variations in the direction of SHmax along the the Great Sumatran fault. Waveform data from a join seismic network of 19 stations deployed by the GeoForschungZentrum (GFZ) Germany and the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) is used. The seismic network had a full coverage of the Sumatran fault and recorded the seismicity from 1 January 2010 to 31 December 2015. A joint inversion of the principal stress and the fault stability is performed. As a results, a correlation between the fault branching and the local stress heterogeneity in the Sumatran fault is expected to be drawn from the results of this study. We hypothesize that the local stress heterogeneity is also affected by the mechanism of the fault, i.e. creeping or locked section of the fault. Topic: Earth and Planetary Sciences 74 Stress drop, earthquake aftershocks and regional stress relation base on static Coulomb failure stressD Kusumawati1*, A D Nugraha2, David P Sahara2 and N T Puspito2 1Earth Science, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia 2Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia *dianksurya[at]gmail.com Abstract Coulomb failure criterion has been applied widely in the scope of earthquake science to explain earthquake interactions base on stress change, with the well-known method named Coulomb failure stress change ($$\triangle$$CFS). Preceding studies have showed: increase $$\triangle$$CFS, depicted as positive stress lobes, has correlation with occurrence of following events. However in the calculation process, ratio between regional stress and earthquake stress drop would affect stress distribution. Based on preceding researches, earthquake stress drop with similar magnitude to regional stress, would give results positive stress lobes along and at the base of the fault. Those stress distribution, would then help explaining events interaction and mechanism of earthquake. This work carries out synthetic modeling of static $$\triangle$$CFS upon varying earthquake stress drop and regional stress using COULOMB3.3. In accord with preceding studies, the results show positive $$\triangle$$CFS along the fault when stress drop is comparable to regional stress. And yet, positive $$\triangle$$CFS would take place at the top and at the base of the fault, expanding to the center of the fault -where the hypocenter is assumed- as the stress drop reaching regional stress in magnitude. This matter might explain separated clusters of aftershocks in different depth for some cases: such as M6.5 2016 Pidie Jaya aftershocks, which we have found. Topic: Earth and Planetary Sciences 75 Utilization of Double-Difference Tomography for Geothermal Exploration: 3D Velocity Structure Interpretation and Fluid Type DeterminationArifa Hijriani (a*), David P. Sahara (b), Andri D. Nugraha (b), Irvan Ramadhan (c), Ridwan P. Sidik (c) a) Geophysical Engineering, Institut Teknologi Bandung, Ganeca 10, Bandung 40132, Jawa Barat, Indonesia *arifahijriani[at]gmail.com b) Global Geophysics Research Group, Institut Teknologi Bandung, Ganeca 10, Bandung 40132, Jawa Barat, Indonesia c) PT. Supreme Energy, Menara Sentraya floor 23th, Jakarta, Indonesia Abstract Geothermal surface exploration entails a multi-geoscientific process, which is aimed to define the geometry and characteristics of the geothermal reservoir prior to drilling. Lately, microseismic event monitoring is becoming a standard procedure in inferring the structure of the potential geothermal reservoir. However, a good coverage of seismic station and abundant seismic events must be fulfilled in order to map the subsurface structure. Taking advantage of the well-designed seismic station deployed at the ARD geothermal field prior its first drilling, a study of microearthquake tomography for 3D reservoir structure delineation is performed in this field. A seismic network of 26 stations was set up for more than eight months from August 2011 within 20 km radius from the center of the expected-reservoir. There are 637 local events were detected and located, which is very high number of seismicity for a region that is not yet under geothermal development. The purpose of this study is to construct 3D seismic velocity structure using double-difference tomography and to infer fluid properties, i.e. steam and brine, from the ratio of the P- and S-wave velocity. An advance waveform cross-correlation technique is applied to improve the quality of the arrival time picking. Double-difference tomography is used due to its ability to reduce uncertainties of the model associated with picking and velocity structure. As a result, a clearer image of the three-dimensional P and S velocity structure and ration within the geothermal reservoir is expected. This image could be a key information for defining the strategy in order to further develop the geothermal field. Topic: Earth and Planetary Sciences 76 3D SEISMIC TOMOGRAPHY TO IMAGE THE SUBSURFACE STRUCTURE OF IY GEOTHERMAL FIELD USING DOUBLE DIFFERENCE METHOD AND WAVEFORM CROSS-CORRELATION: PRELIMINARY RESULTSIndriani Yunitasari1, Andri Dian Nugraha2, Mohammad Rachmat Sule3 1Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia 2Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia 3Exploration and Engineering Seismology Research Group, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, Jawa Barat, Indonesia Abstract IY Geothermal Field is located in southern part of Bandung, West Java, Indonesia. This geothermal field is dominated by liquid and vapour conditions. In this study, we used microearthquake waveform and catalog data around the geothermal field to determine 3-D seismic velocity through tomography inversion. The data was recorded by 15 stations around IY geothermal field area. During ten months of recording, there were 926 microearthquake events have been identified. We conducted subsurface 3D seismic velocity by using double difference tomographic (tomoDD) in order to delineate structure around the reservoir. To improve the distribution of initial hypocenter from data catalog, we relocated the hypocenters using double difference method and using waveform cross-correlation to enhance P-and S-wave arrival times as input for tomographic inversion. We updated data catalog and applying threshold of coefficient value that we used is around 0.732-0.822, depends on updated waveforms from cross-correlation method. From 15 stations, there are two stations used threshold value above 0.8 for P-wave and two stations for S-wave, whereas other stations used value of 0.732-0.8. The ongoing process, is to determine seismic velocity structure by applying tomographic inversion. We also know the clustering events near well in geothermal field. The result shows the relocated hypocenters with 3-D velocity model to determine geothermal zones, such as brine and steam, depends on the value of Vp, Vs, and Vp/Vs ratio. Topic: Earth and Planetary Sciences 77 Seismic Tomography under Mt. Sinabung Using Waveform Cross-Correlation Arrival Time Data from October 2010 - December 2011: Preliminary ResultsZakaria S. Laksmana (a*), Andri Dian Nugraha(b), Sri Hidayati (c) a) Geophysical Engineering, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, West Java, Indonesia *nivalyx[at]gmail.com b) Global Geophysics Research Group, Institut Teknologi Bandung, Jl. Ganeca 10, Bandung 40132, West Java, Indonesia c) Center of Volcanology and Geological Hazard Mitigation, Jl. Diponegoro 57, Bandung 40122, Indonesia Abstract Sinabung Volcano is an active stratovolcano located in the North Sumatera, Indonesia with a frequent volcanic-related activity over the past years. Based on seismicity monitoring which was conducted from October 2010 ? December 2011, a high frequency of microseismic events (especially volcano-tectonic events) was observed in which our data catalog records a total of more than 400 volcano-tectonic events spanning over this period. Throughout our study, so far we have observed that Sinabung Volcano?s volcano-tectonic events were concentrated northeast from the volcano?s peak, with a cluster of events being observed 2 kilometers beneath sea level. In regards to this we have also been conducting a waveform cross-correlation process in order to improve the data catalog?s picking results in order to relocate and improve the events? hypocentral location so that it can be more accurately represented. The updated data are then used as an input for a delay-time tomography by using SIMULPS method, in which the output tomogram is then interpreted according to Sinabung Volcano?s properties so that we can better understand the evolution of Sinabung Volcano?s sub-surface features over the aforementioned period in order to get a better understanding of Sinabung Volcano?s characteristics for future disaster mitigation purposes. Topic: Earth and Planetary Sciences 78 3D Seismic Velocity around Source Region of Mw 6.5, 2016 Pidie Jaya Earthquake from Double Difference Tomography and Waveform Cross Correlation: Preliminary Results1Rianty Kusuma Dewi, 1Andri Dian Nugraha, 2Rexha Verdhora Ry 1.Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No 10, Bandung, 40132 2.Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No 10, Bandung, 40132 Abstract Pidie Jaya earthquake occured on 7th December 2016. It causes a lot of damage and 102 victims reported by National Disaster Management Authority (BNPB). According to Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG), the main shock happened at 05:03:36 WIB in 5.42 north latitude and 96.24 east longitude with magnitude of 6.5 (depth of 15 km). A week after, research collaboration of ITB, Unsyiah, BMKG and GFZ Postdam Germany installed 9 seismometers around Pidie Jaya since 14th December 2017 to 16th January 2017. It has been identified that there were 302 of aftershock events. In this study, we have been conducting (i) determination of location of hypocenter using probabilistic grid searching method with NLLoc program, (ii) updating of 1D seismic velocity model using Joint Hypocenter-Velocity Determination (JHD) with Velest program, (iii) enhance of picked of P-and S-wave arrival time using Waveform Cross Correlation Method, and (iv) determining 3D Vp, Vs, and Vp/Vs structure in the region using tomography double difference method with program TomoDD. Tomography double-difference inversion gives the clearest image in 15 km depth. It has been identified the existence of fault with strike N45SE. The angle of the dip become steeper from north east (10 degree) to south west (40 degree). The structure of fault can be determined by the existence of the contrast between low velocity anomaly (red) dan high velocity anomaly (blue). The aftershock most common happened in low velocity zone (red color). Topic: Earth and Planetary Sciences 79 Implementation of GMSTech - a New Practical Software for Microseismic Data Processing - for Estimating Event Source ParametersRexha V Ry (1*), D P Sahara (1), M Rohaman (2), C Suhendi (2), K H Palgunadi (2), S Widiyantoro (1), A D Nugraha (1), T Yudistira (1), B S Prabowo (2), B Mujihardi (3) 1 Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung 2 Volcanology and Geothermal Laboratory, Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung 3 Pertamina UTC, Indonesia (*corresponding email: rexha.vry[at]gmail.com) Abstract Nowadays, microseismic monitoring has been utilized widely to detect fractures and permeability zones in many geophysics applications for exploration: geothermal resources, unconventional hydrocarbon resources, and many else. It is required to process microseismic data effectively and efficiently, however, integrated software for microseismic data processing is not available yet. We developed GMSTech (Ganesha Microseismic Technology), a Windows C# language based software which integrates complete functions and modules for microseismic characterization. In this paper, we discuss an implementation of the two modules which can be used for calculating microseismic event source parameters: magnitude and focal mechanism, using a data recorded in the certain geothermal field. For computing the magnitude, we implemented Brune model which the algorithm includes spectral fitting. For estimating the focal mechanism, we developed a new simple algorithm based on grid-searching, clustering, and statistical analysis. In the results, our modules have successfully calculated the source parameters and it is reliable for geothermal exploration. However, several factors such as coverage and number of stations may influence the results significantly, and moreover, the computation time still needs improvements. Nevertheless, the GMSTech shows a remarkable performance and it is more practical to be utilized for industry purposed if compared to other software. Topic: Earth and Planetary Sciences 80 Progresses on Magnetorotational InstabilityHimawan Winarto Princeton University Abstract I will describe the current numerical and experimental approaches for magnetorotational instability which is believed to be the driving mechanism of energy transport in magnetized accretion disk. The incorporation of pressure tensor on hybrid-MHD simulation shows interesting properties in the kinetic regime. This can be investigated further by the laboratory MRI experiment using liquid galinstan alloy (GaInSn). Unlike observations of astrophysical plasma, laboratory astrophysical experiments can be used to investigate MRI over broad range of parameters with direct diagnostics. Topic: Earth and Planetary Sciences 81 Western Java Ambient Noise Tomography: Preliminary ResultShindy Rosalia(a*), Tedi Yudistira (b), Sri Widiyantoro (b), Phil R. Cummins (c), Andri D. Nugraha (b) (a) Graduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung *shindy.rosalia31[at]gmail.com (b) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Indonesia. (c) Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia. Abstract Western Java, Indonesia, has at least three important active faults: the Cimandiri, Lembang, and Baribis Faults, which pose a great danger for the cities near them. It is crucial to have a better understanding of shallow crustal structure to delineate active faults and deep basins in order to support seismic hazard and disaster mitigation efforts in Indonesia. In this study, we perform ambient seismic noise tomography which can give better resolution of the shallow structure beneath western Java. We have deployed a seismometer network in the western to central Java region through a research collaboration program between Bandung Institute Technology (ITB) and Australian National University (ANU). We deployed 70 seismometer stations from June to February 2017 to acquire ambient seismic noise data. As the first stage of the data processing, we will focus on conducting single data preparation and cross-correlation to retrieve an estimate of Green?s function between station pairs. We also use the frequency-time analysis technique to obtain dispersion curves to measure the interstation group velocity. The group velocity is use as an input in tomography inversion process. Our preliminary result show that the low velocity anomaly associate with sediment basins and the high velocity anomaly associate with southern mountains. Topic: Earth and Planetary Sciences 82 Investigation on 3D fractal dimension as complexity parameter of fluid flow in 3D porous mediaUlpa Zein Fawziah (a), Aceng Kurnia Rochmatulloh (a), Selly Feranie (a), Fourier Dzar Eljabbar Latief (b), Prana F L Tobing (a) a) Earth and planetary science Physics Department, Indonesian University of Education Jl. Dr. Setiabudi No 299, Bandung 40154 b) Physics of Earth and Complex Systems, Bandung Institute of Technology, Indonesia Jl. Ganesha No 10, Bandung 40132 Abstract 3D Fractal dimension as complexcity parameter of fluid flow in 3D porous media is investigated. The 3D porous media sized 150x150x150 pixels are contructed by randomly spherical grain radius in the range of 10-20 pixels until reach the same porosity of 15%. Fractal dimension are obtained by box counting method. The fluid flow in 3D porous media are obtained by applying Randow walk in three different direction. Tortuosity define as ratio between the trace ratio between flow path through the connected pores to the porous media length size in flow direction. As tortuosity increases, the the complexcity of fluid flow in 3D porous media increases In first sample,tortuosity in x, y, z direction and its 3D pore fractal dimensiom respectively are 4.48, 2.50, 9.66 with fractal dimension 2.79, In second sample, tortuosity in x, y, z direction and its 3D fractal dimensiom respectively are 4.64, 12.94, 6.14 with a fractal dimension of 2.87. the third sample, tortuosity in x, y, z direction and its 3D fractal dimensiom respectively are14.32, 3.65, 8.1 with a fractal dimension of 2.96. And for the fourth sample, tortuosity in x, y, z direction and its 3D fractal dimensiom respectively are 14.32, 3.65, 8.1 with a fractal dimension of 2.96. the average and deviation tortuosity and its fractal dimension for respectively 5,5466667, 3,69726 and 2,79 (first sample); 6,8266667, 2,805928 and 2.83 (second sample); 7,9066667, 4,423046 and 2.87 (third sample); 8,69, 5,359412 and 2.96 (fourth sample). From these results, we found that average tortuosity and deviation of each direction increases as pore fractal dimension increases. It indicates that the higher 3D fractal dimension for 3D porous media the fluid flow on the porous media is more complex and unisotropic. Based on these result 3D fractal dimension can be considered as both complexcity and unisotropic degree of fluid flow in 3D porous media. Topic: Earth and Planetary Sciences 83 Improved Hypocenter Data Catalog around Indonesia Region by using teletomoDD and 3D Seismic Velocity Model: Preliminary ResultsY H Sinaga(a), S. Rosalia(a), A D Nugraha(b), S Widiyantoro(b), Daryono(c), S Wiyono(c) a) Geophysical Engineering, Institut Teknologi Bandung, Ganeca 10, Bandung, Jawa Barat, Indonesia b) Global Geophysics Research Group, Institut Teknologi Bandung, Ganeca 10, Bandung, Jawa Barat, Indonesia c) Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG), Indonesia Abstract Indonesian tectonic territory is characterized by the collision of many tectonics plates such as Eurasia, Indo-Australia, Pacific and Philippine where interaction between the plates result in complex dynamics followed by the high level of seismicity. Availability of denser seismometers after Aceh-Andaman megathrust earthquake with magnitude 9.3 in 2004 and Nias earthquake with magnitude 8.6 in 2005, had supported seismicity studies in Indonesia which one of them is hypocenter relocation. In this study we enhanced hypocenter location by applying the teleseismic double-difference (teletomoDD) relocation method which combining the arrival time of P and S waves from the station with local, regional and teleseismic distance. Earthquakes catalog data are obtained from the Indonesia Agency for Meteorology, Climatology, and Geophysics (BMKG) for the period of May 2009 to January 2017. Figuring travel time calculations are using 3D seismic wave velocity model with grid sizes 10x10 for Indonesian region, while for the outside these region used 1D velocity model. The preliminary results show some tectonics figures such as slab subduction and active faults are seen clearly. Topic: Earth and Planetary Sciences 84 Design Of Microtremor Monitoring Tools Using Accelerometer Sensor On Android Mobile To Determine The Natural Building Frequency In Library Unit (UPT Perpustakaan) UNSRio Riantana, Darsono, Agus Triyono Physics Department, Faculty of Matehmatics and Natural Sciences, Sebelas Maret University Abstract Design of Microtremor monitoring tools using accelerometer sensor on android phone to determine the natural frequency of buildings in UPT Perpustakaan UNS has done. The main sensor for recording microtremor activity is Accelerometer sensor on android phone. Microtremor activity recording is done on every buildings floor of UPT Perpustakaan UNS and on the surface of land outside the building. From microtremor activity recording, the recorded data is sent to the server by telemetry methode. The data stored on the server then displayed in the graph on the microtremor web monitoring. Microtremor data is processed with the FFT function to determine the dominant frequency. From the dominant frequency we find ratio of resonance of soil and building of UPT Perpustakaan UNS. From the calculation the value of resonance ratio is 69.35 - 94.48% in the NS component and 70.42 - 98.61% in the EW component with low resonance status on each floor of the building. Topic: Earth and Planetary Sciences 85 Modeling fluid propagation in a naturally fractured formationFatkhan***, David P.Sahara**, Cahli Suhendi*, Mohammad Rachmat Sule*** *Geophysical engineering, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung ** Global Geophysics Research Group, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung ** Seismology, Exploration and Engineering Research Group, Faculty of Petroleum and Mining Engineering, Institut Teknologi Bandung Abstract Injection activity changes reservoir pore pressure and temperature condition and then alters the stress condition of the reservoir. Increasing pore pressure from injection leads to a decrease in effective stress of reservoir rocks and surrounding rocks. It might be accompanied by increasing porosity, permeability and capillary pressure. It also induces deformation and failure and surface uplift. This whole process is modeled by coupled Thermo ? Hydro ? Mechanics (THM) proposed in this study. We develop UI (User Interface) program that linking two existing and proven programs, TOUGH2 and FLAC3D and use it to simulate coupled THM of CO2 injection in Gundih Field, as part of CCS Pilot Project in Indonesia. TOUGH2 is numerical simulator that solves fluid flow and transport equation. FLAC3D is numerical code to simulate geomechanical analysis. A layered naturally fractured reservoir is built. A boundary condition representing the typical far field stress at around 800 m depth is set. A injection scheme of 30 tons CO2 per day for one year is applied. At this depth CO2 is expected to be in supercritical condition (depending on hydrostatics pressure and gradient thermal condition). We show that the coupling program code has successfully simulate CO2 injection into the fractured reservoir. Topic: Earth and Planetary Sciences 86 The Effect of Earthquake to Stability and Run Out Distance of Landslide During Rainfall : a case study of landslide prone area in West Java, IndonesiaCucu Rizkianti (*a), Selly Feranie (b), Adrin Tohari (c) Universitas Pendidikan Indonesia Abstract The effect of earth quake to landslide stability and run out distance on landslide zones in West Java-Indonesia during rainfall was investigated considering different slope angle. An earthquake peak ground acceleration 0.3 gal for 20 s is applied on landslide zones under a rainfall intensity of 10mm/h for 4 hour. In this study, the slope angles of $$26^{o}$$, $$33^{o}$$, $$45^{o}$$,$$56^{o}$$, and $$68^{o}$$ are considered. The analysis of the slope stability in the case the safety factor decreases with the increase slope angle. With the introduction of rainfall and earthquake, the safety factor of the slope drops below 1.0 one the slope angle higher than $$33^{o}$$. The calculations of landslide during rainfall and earthquake shows the landslide masses generated from the slope with an angle of $$45^{o}$$ will travel more than those from the slope with an angle $$68^{o}$$. This is due to the landslide masses from the slope $$45^{o}$$ is smaller than that from the slope of $$68^{o}$$. From this study, the earthquake makes the stability of the slope decreases further. However, the run-out distance of landslide masses due to the combination of rainfall and earthquake will have no significant different when compared with that due to rainfall alone. Topic: Earth and Planetary Sciences 87 Structure and Oxidation Resistance of Flame Sprayed Fe-Ni-Al coatingAdlShahida Ismail Datu-Maki1, Ciswandi2, Bambang Hermanto2, Sitti Ahmiatri Saptari1, Toto Sudiro2 1Physics Department, Science and Technology Faculty, Universitas Islam Negeri Syarif Hidayatullah Jakarta 2Research Center for Physics, Indonesian Institute of Sciences Corresponding Author: toto011[at]lipi.go.id Abstract Two types of Fe-Ni-Al coatings as 75Fe-15Ni-10Al and 56Fe-14Ni-30Al were successfully deposited on the surface of low carbon steel using a flame spray technique. The high temperature oxidation resistance of coating with and without annealing was evaluated in air at 800oC for up to 8 cycles. The structure of Fe-Ni-Al coatings before and after cyclic oxidation test was studied by X-ray diffraction and scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometer (EDX). According to the results, the coating composition strongly affects the oxidation resistance of Fe-Ni-Al coatings. As the Al content in the coating increases, the oxidation resistance of Fe-Ni-Al coating increases as well. Topic: Earth and Planetary Sciences 88 Zener diode vs rectifier diode: The comparation of Gaussian probability distribution charts from full-wave rectifier circuitsHaris Rosdianto Sekolah Tinggi Keguruan dan Ilmu Pendidikan (STKIP) Singkawang Abstract What will happen if the rectifier diode in the rectifier circuit is replaced by zener diode? The aim of this research is to get an explanation why the use of zener diode in full-wave rectifier circuit is not suitable. The diode used in this research is IN4728 zener diode and IN4002 rectifier diode, which is connected to 1,200 ohm resistor. The circuit is supplied with 5-volt AC power supply with frequency of 50 Hz. The output voltage data of the diode is clipped by using LoggerPro voltage sensor. The data is processed by fitting the data according to the Gaussian probability distribution. The results showed that the Gaussian probability distribution chart of the circuit using IN4728 zener diode has an asymmetric shape, unlike the Gaussian probability distribution chart of the circuit using an IN4002 rectifier diode that has a symmetrical shape. The IN4728 zener diode has breakdown voltage of 3.3 V. When reversed bias is occur and the source voltage exceeds the breakdown voltage of the zener diode, the voltage still pass through the zener diode at 3.3 V. This causes the charts of its Gaussian probability distribution has an asymmetric shape. So it can be concluded that the use of IN4728 zener diode for rectifier circuit is not suitable. Topic: Instrumentation and Measurement 89 An Ultrasonic Sensor System for Vehicle Detection ApplicationRoni Stiawan, Adhi Kusumadjati, Nina Siti Aminah, Mitra Djamal, Sparisoma Viridi Institut Teknologi Bandung Abstract This paper develops an ultrasonic sensor system that can be used to determine the number, type, and speed of cars vehicle passing a point over some specified time period. The proposed system consists of two ultrasonic sensors and a microcontroller equipped with data logging shield. The data were recorded and then analyzed using a computer program written in Java Actual experiments conducted indicates that this system can give a correct number of vehicles in a given interval of time. Topic: Instrumentation and Measurement 90 Thermal Effect of Electromagnetic Suspension (EMS) Performance for Maglev Conveyor Prototype Levitation SystemDeny Viviantoro, Aliq Zuhdi, Ign Agus Purbadi W Polytechnic Institute of Nuclear Technology Abstract Electromagnetic suspension (EMS) is one of three air gap forming method on maglev vehicle. Beside of applicable on low or high speed vehicle, cheap fabrication, commercially available component, and ease to control than the other, this method still have weakness characteristic. The magnet is generated by winding wire on the U-shaped iron core that causing thermal excess from power loss and eddy current effect. Since the system running in certain time, accumulative thermal from the heat power loss is greater. The greater thermal production will increase resistance on winding wire and reluctance on iron core, so there are decreasing of magnetic flux production and movement. Both of the problem will be analyze to get the appropriate number current flow on wire so the thermal effect can be minimized for air gap forming performance on maglev conveyor prototype. Topic: Instrumentation and Measurement 91 EXPERIMENTAL OF SANDING PHENOMENA WHILE FLUID PRODUCTION USING THICK WALLED CYLINDER LABORATORY TESTING: CASE OF REAL INDONESIA ROCK SAMPLEBagus Endar B. Nurhandoko1, Mahatman Listyobudi2, Susilowati2 1)Wave Inversion and Subsurface Fluid Imaging Research, Physics Dept, FMIPA, Institut Teknologi Bandung 2)Rock Fluid Imaging Lab. Abstract Oil and gas production in weakly consolidated or unconsolidated sand formation can lead to failure on the wall of well. The sand failure raises the serious problems in production, well economic and well?s stability. The problem in sand production can increase significantly to the wellbore cleanup operation, erosion damage to tubing and equipment. This paper present an experimental of sand production while fluid pumping out which caused by wall?s failure in a well. The failure or formation?s damage may occur since pressure exceeds the failure criteria. We investigate the critical pressure depletion causing rock?s failure in a sample of sand. The testing using specially designed hollow core called as thick wall cylinder testing are conducted under various pressure conditions to reveal information of initial pressure depletion. We use some real sand samples collected from actual outcrop formation from Indonesia. Detail of experiment and the quantity analysis of fluid production in stable well condition are also presented in this paper Topic: Instrumentation and Measurement 92 Surface studies on hydrophobic polyethylene-silica nanocomposite coating systemiqroatul hasanah institute of technology sepuluh nopember Abstract This research develops a one-step technique to synthesize hydrophobic polydimethylsiloxane (PDMS)?silica nanocomposite coating with variation three phases of silica nanoparticles on the surface of glass substrates. Those phases are silica quartz (SQ), silica amorphous (SA), and silica cristobalite (SC). The PDMS/SC and PDMS/SA nanocomposite coatings show the hydrophobic properties, and the water contact angle (WCA) values are 142.41? and 148.24?. The CA of the PDMS/SC nanocomposite coatings reached as lowest as 122.07?. The surface morphology was characterized by scanning electron microscopy (SEM). SEM images of the coatings showed micro-nano binary structure. PDMS/SA was found many papillae with diameters of 75 ? 500 nm are distributed randomly on the coating surface and the surface of each papilla is rough and PDMS/SC with diameters of 0.5 ? 4 ?m. The results confirm dip-coating method provide the best solution to fabricate hydrophobic silica coating with low cost. Topic: Instrumentation and Measurement 93 Development of Brewsters Angle measurement using Microcontroller unitsAhmad Marzuki, Lintang Bongkar Girana, Mahmudah Salwa Gianti Physics Departement, Faculty of Mathematics and Natural Sciences, Sebelas Maret University Abstract Brewsters angle method is one that commonly used for measuring high index material. This method enables one to measure unlimited range of refractive index. Due to complicated setup of measurement, measurement is commonly carried manually. This paper presents an automatic instrument for measuring Brewsters angle designed using microcontroller unit (MCU) Arduino. Calibration was made by comparing what was measured by this method with that measured using ABBE Refractometer. It was found that both method showed a resembling results. Using both instrument for measuring PMMA refractive index, we found that the refractive index value of PMMA is 1.488 with the accuracy level is 99.8%. Topic: Instrumentation and Measurement 94 Pressure Mapping System Developed based on Intensity Modulated Fiber SensorAhmad Marzuki, Mahmudah Salwa Gianti, Lintang Bongkar Girana, Hery Purwanto, Stefanus Adi Kristiawan Universitas Sebelas Maret Abstract The development of smart-mat as a pressure mapping sensor has received great interest. These sensors have been used for variety of human needs, from medical to smart-house. The main objective of this research is to point out the feasibility and effectivity of mapping fiber sensor subjected to a load given to a certain area to the pressure distribution on the mat surface. The proposed pressure distribution fiber sensor was made by sandwicthing partially scrathed polymer optical fiber to form a web. Five strands of partially scrathed fiber were inserted sandwicthed horizontally in a rubber mat and the other six strands were sandwicthed vertically. As the mat is loaded, optical fiber sandwichted underneath the load is bent resulting in light attenuation. Analyzing the attenuation light from both sides using matrix method, a contour area representing pressure distribution can be constructive. Topic: Instrumentation and Measurement 95 Development of Simple Nozzle-Type Rainfall Simulator for Landslide SimulationElfi Yuliza1,2, Iful Amir1,2, Muhammad Miftahul Munir1,2,a , Mikrajuddin Abdullah1 and Khairurrijal Khairurrijal1,2,b 1Department of Physics, Faculty of Mathematics and Natural Science 2Research Center for Disaster Mitigation Institut Teknologi Bandung, Jalan Ganeca 10, Bandung, 40132, Indonesia amiftah[at]fi.itb.ac.id, bkrijal[at]fi.itb.ac.id Abstract Rainfall simulators are an essential research tool for understanding the hydrological processes between rainwater and soil including soil erosion, overland flow generation, infiltration, etc. Many types of rainfall simulators have been developed with unique characteristics according to their applications and research focuses. This study was intended to design and develop a laboratory scale rainfall simulator to investigate landslide mechanism triggered by increased rainfall intensity. The designed rainfall simulator should have the range of rainfall intensity 50 to 100 mm/h and low kinetic energy to prevent soil erosion. Therefore, we developed a system of rainfall simulator which consisted of nozzles, a submersible pump, a flowmeter, and valve. The submersible pump was used to flow the water from the water tank to the nozzles. In order to monitor the water flow rate, the flowmeter sensor was employed. The use of nozzle was to enable rainfall production with various drop size and distribution area. To verify the rainfall simulator performance, various characterization processes was carried out such as uniformity distribution test via the Christiansen uniformity coefficient (CuC), rainfall intensity test by using simple rain gauge method, drop size measurement by using white flour surface and image processing, and kinetic energy by theoretical approach. Topic: Instrumentation and Measurement 96 Influence of Addition Ba-Ferrite on the Hardness, Magnetic Properties and Coorosion Resistance of Hybrid Bonded Magnet NdFeBRamlan1), Muljadi2),a), Prijo Sardjono2), Fakhili Gulo3), Dedi Setiabudidaya1 1)Departement of Physics-FMIPA, Sriwijaya University, Palembang, Indonesia 2)Research Center for Physics-Indonesian Institute of Sciences. 3) Pasca Sarjana, Department of enviromental, Sriwijaya University, Palembang, Indonesia a) email : muljadi2002[at]yahoo.com Abstract The preparation of Hybrid Bonded Magnet based of NdFeB with additon of BaFe12O19 has been done. Composition of BaFe12O19 (3, 5, 8, and 10 % wt). Preparation process was started by mixing NdFeB (MQP-B+) powder with BaFe12O19, then mixed with addhesive Exopy Resin 5 %bwt and compacted with pressure 40 MPa to form a pellet with diameter of 16 and thickness 5 mm. Samples which have been pressed then dryed using Under Vacuum Dryer (10 mmbar) with heating temperature 90oC, for 1 hour. The characterizations was conducted on the physical properties, such as Hardness Vickers, magnetic properties by using Gaussmeter and VSM, and measurement of corrosion resistence by using salt method. The best result for hardness test is hybrid bonded magnet NdFeB with compositions of 90 %wt NdFeB, 10 %wt BaFe12O19 and 5 %wt epoxy resin. Hardness value of hybrid bonded magnet NdFeB of this compositions is = 265,13 HV. The best result for magnetic properties is hybrid magnet NdFeB with compositions of 95 %wt NdFeB, 5 %wt BaFe12O19 and 5 %wt epoxy resin. Those magnetic properties are Flux Density = 1340 Gauss, Br (remanance) = 3,827 kG, Hcj (coercivity) = 8,924 kOe dan BHmax (Energy Product) = 2,847 MGOe. According the corrosion result test is found that sample with higher content BaFe12O19 has better corrosion resistance compare to sample with small content of BaFe12O19 . Topic: Interdisciplinary Physics 97 Influence of Variation of Electrical Current Welding of ASTM Steel A 36 on Micro Structure and Mechanical PropertiesDjuhana1),a) , Mulyadi1),a) 1)Departement of Mechanical Engineering, Faculty of Technik, Pamulang University, South Tangerang , Banten province, Indonesia. a) email : muljadi2002[at]yahoo.com; dosen01545[at]unpam.ac.id Abstract The welding process of ASTM A 36 metal was carried out using SMAW welding machine with variated electric current welding ie: 95 A, 105 A and 120 A. To analyze the welding results, several tests have been conducted, such as observing micro structure changes using optical micriscope and changing the hardness value at the welding point and the area around the welding (heat afected zone -HAZ), and measuring the impact strength value. Microstructure for in HAZ, welding zone and in metal base is different for each variable of welding power. Where in the base metal region there are always ferrite and pearlite phases, it indicates as a low carbon steel materials. If the electric current welding increases then the welding temperature will rise and consequently at the HAZ and at welding zone areas will form new phases like austenite and martensite. Based on the results of vickers hardness measurements, indicating that the las power increases, the value of its hardness increases, as well as the hardness at welding zone has the highest hardness of about 450 -515 kgf.mm2. The impact test results show that the impact strength of the original metal without welding is 3.23 J / mm2, but the impact strength value after welding depends on the electric current of the welding, if the electric current of welding increases, the impact strength tends to decrease, becouse material become brittle. The optimum welding result is obtained at welding by using electric current 95 A, because in this condition is obtained impact strength close to the value of the original metal. Topic: Interdisciplinary Physics 98 Synthesis and Characterization of Ba-Ferrite with Variation of Nd2O3 additive by Powder Metallurgy MethodSuprapedi1), Muljadi1),a), Priyo Sardjono1 1)Pusat Penelitian Fisika, Lembaga Ilmu Pengetahuan Indonesia KawasanPuspitek,TanggerangSelatan,15314 a)Email: muljadi2002[at]yahoo.com Abstract Ba-ferrite is material permanent magnet (PM) with formua stochiometri BaO.6Fe2O3 and it has relaively low magnetic properties compared to other materials such as PM from rare earth materials. There are many methods to increase of magnetic properties, firstly by modification of grain size and microstructure and secondly by using additive. In this experiment, that Ba-ferrite with additive 0%, 0,5% and 1,0 %wt. Nd2O3 have been made by using raw materials: BaCO3 (p.a) and Fe2O3 (p.a). The raw materials and additive were mixed and milled by using a ball mill for 24 hours and milling media is aquadest. After that the samples were dried at 100oC for 6 hours and then the samples were calcined at temperature 1000oC for 2 hours by using electrical furnace. The calcined samples were milled by using a ball mill for 6 hours and sieved until passing 400 mesh. After that the all powders were formed by using hydraulic pressure machine at pressure 40 MPa to obtain a pellet with diameter 18 mm and thickness 5 mm. The pellet was sintered with heating rate 10 oC / minute and at temperature 1150oC and holding time was 1 hour. According the characterization results show that the optimum of additive composition is 0.5%wt.Nd2O3, at this condition , the magnetic properties can increase about 40 %, where remanence value (mr) is 33.72 emu/g, the coercivity value (Hc) is 2.907 kOe and flux magnetic value is 650 Gauss. According the xrd results shows that the peak of Nd2O3 phase does not appear at sample with 0.5 % Nd2O3, but it appears at sample with 1.0 % Nd2O3. Topic: Interdisciplinary Physics 99 Effect of Potential on Corrosion Behavior of Tartaric-sulphuric Acid Anodized 7075 T6 Aluminium AlloysM I Tawakkal1,a), Akhmad A. Korda1,b) 1Department of Metallurgical Engineering, Faculty of Mining and Petroleum Engineering Bandung Institute of Technology, Jl. Ganesha 10 Bandung 40132 Indonesia a)Corresponding author: m.i.t[at]students.itb.ac.id; b) akhmad[at]mining.itb.ac.id Abstract Anodizing of aluminum alloy in tartaric-sulfuric acid (TSA) is studied as an alternative to replace chromic acid anodization (CAA) to obtain more environmentally-friendly process. Bare 7075 T6 aluminum alloy specimens were anodized in TSA and subsequently protected by boiled water sealing treatment. The TSA solution used contains 86,76 gpl tartaric acid and 44 gpl sulfuric acid at 37C. Some specimens are anodized in CAA as comparison. In this research, the effect of anodization potential of 7075 T6 aluminum alloy in TSA on the thickness, weight, and corrosion resistance of anodize layer are studied. Corrosion resistance test was carried out by conducting salt spray test for 96 hours and corrosion potential and current density measurement using potentiostat. The morphology and chemical composition of the sealed anodize layer were evaluated by scanning electron microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The results showed that the thickness and weight of the anodize layer increases as the anodization potential increases. The best corrosion resistance is achieved by 7075 T6 aluminum alloy specimen with potential anodization of 15 V. Topic: Interdisciplinary Physics 100 Characterization of Tartaric-Sulphuric Acid Anodized 2024-T3 Aluminium Alloys with Anodizing Potential VariationM H Setianto1,a), Akhmad A. Korda1,b) 1Department of Metallurgical Engineering, Faculty of Mining and Petroleum Engineering Bandung Institute of Technology, Jl. Ganesha 10 Bandung 40132 Indonesia a)Corresponding author: muhamadhananuput[at]students.itb.ac.id; b) akhmad[at]mining.itb.ac.id Abstract The influence of anodizing potential on corrosion resistance, coating weight, and coating thickness of AA 2024-T3 aluminium alloy anodized in tartaric-sulphuric acid (TSA) has been investigated. Specimens were anodized in TSA bath then sealed in boiling water bath. Anodizing was performed with potential variations of 11, 13, 15, 17, 19, and 21 volt (V). Corrosion resistance test was carried out by 96 hours salt spray test and potentiodynamic polarization. Coating weight was determined by gravimetric method and coating thickness was determined by metallographic method. Salt spray test results showed that anodizing potential did not affect corrosion resistance. Corrosion potential has the same value with pitting potential for all specimens. Corrosion potential increases with increasing anodizing potential from 11 V until 19 V and then decreases at 21 V anodizing potential. Corrosion current was not affected by anodizing potential. Coating weight and coating thickness increases with increasing anodizing potential. Topic: Interdisciplinary Physics 101 A New Physics Models for Wind Resistance of Coconut TreeRahmawati Munir, Handika Dany Rahmayanti, Nadya Amalia, Sparisoma Viridi, and Mikrajuddin Abdullah Department of Physics, Institut Teknologi Bandung Abstract An investigation of how coconut palm tree withstands gale force winds has been performed. When observed carefully, the motion of the stalks and leaves affected the wind resistance. The stalks and leaves moved at random when intentioned wind blowed. However, there is still no report on the physical modelling. This paper proposes a simple mathematical model to analyze the phenomenon. A simple tool was also designed to retrieve data using Video Tracker. The experiments were conducted on several type of springs. The model showed that the theoretical prediction accurately explained the phenomenon. Topic: Interdisciplinary Physics 102 The effect of lithium nitrate towards electrochemical properties of Carboxymethyl ChitosanN. N. Mobarak, A. Ahmad, M. P. Abdullah School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia Abstract Carboxymethyl chitosan has showed its potential to be used as host polymer for solid polymer electrolyte application. The effect of lithium nitrate towards electrochemical properties of solid polymer electrolyte based carboxymethyl chitosan has been investigated. Solid polymer electrolyte based carboxymethyl chitosan was prepared by solution-casting technique. The films were characterized by Attenuated Total Reflected Fourier Transform Infrared (ATR-FTIR) Spectroscopy and Electrochemical Impedance spectroscopy to determine the chemical interaction and electrochemical properties of the polymer electrolytes. Based on ATR-FTIR spectra, the lithium ions tends to interact with carbonyl group and ether group in carboxymethyl chitosan structure. The highest conductivity achieved was 8.44 Topic: Interdisciplinary Physics 103 Antibacterial investigation activity of technical grade Titania anataseDesyana Olenka Margaretta(1),Kingkin W.Permadi (1), Sparisoma Viridi(1) Mikrajuddin Abdullah(1,a) (1)Department of Physics Bandung Institute of Technology Jalan Ganeca 10, Bandung 40132 Indonesia (a)E-mail: din.fi[at]itb.ac.id Abstract TiO2 (titania) has good potential as anti-bacterial agent with photocatalytic process. TiO2 attacks the membrane with radical * OH, inhibit the synthesis of proteins and nucleic acids in bacteria, radicals *OH can be a strong oxidizing agent anti-bacterial activated by irradiating UV-C. We do coating with Technical grade titania anatase from Bratachem to observe their photoinactivation activity . Titania deposited on organic subtrat and polyprophilen substrat by spray method and heated. Investigation of Antibacterial testing using plate count method. The Plate Count Method principally calculates the number of colonies formed on each plate. Plate Count Method is performed by dissolving samples containing bacteria with physiological salt water. After dissolving, take one chip from each sample then irradiated with UV lamp for 24 hours and counted. This experiment shows good result in bacterial photoinactivation effectiveness. Technical grade Titania from Bratachem has good performance almost as nano pure titania. Technical grade Titania anatase from bratachem, Indonesia is observed 99% can reduce bacterial colonies.The Technical grade titania has potential for large scale application. Topic: Interdisciplinary Physics 104 The Effect of Hydrophylic Coating on Concrete Pile Surface in Pile Driving: Real Field TestNadya Amalia, Elfi Yuliza, Mamat Rokhmat, Edy Wibowo, Sparisoma Viridi, and Mikrajuddin Abdullah Institut Teknologi Bandung Abstract At laboratory scale, hydrophilic coating on the surface of precast concrete piles is capable of affecting the piles to be installed into a certain depth level with less number of hammer strokes than piles without coating. In this work, a preliminary study of pile driving tests in the real field with the same type of soil at the laboratory scale was carried out. Based on our analysis results of the measurement data it was found that the hydrophilic coating has different effects on the pile driving at laboratory and real field scales. Topic: Interdisciplinary Physics 105 The Influence of Oil Price Fluctuations on Indonesian Stock Prices Through Wavelet CoherenceQoniti Amalia, Acep Purqon Institut Teknologi Bandung Abstract Oil is the most important source of energy in the world. In 2014 price of world oil (WTI / West Texas Intermediate) showed a decline. The decline in oil prices was followed by stock prices including the price of Indonesian stocks. A phenomenon where asset price move together, known as comovement be an important indicator for investors to make investment decisions. This study aimed to know the influence of oil price fluctuations on Indonesian stock prices during the oil prices downturn period from 2014 (March 2014-March 2017). Shares study consist of five Indonesian stocks ; Adaro Energy Tbk (ADRO), Aneka Tambang Tbk (ANTM), Vale Indonesia Tbk (INCO), Perusahaan Gas Negara (Persero) Tbk and Tambang Batubara Bukit Asam (Persero) Tbk. The method used is the method of wavelet coherence. Based on this method, the time series can be investigated in time domain and frequency domain. Plot contours of wavelet coherence gave information comovement of two time series. The results of this study indicate Adaro Energy Tbk has the most significant comovement while the Perusahaan Gas Negara (Persero) Tbk show the least. Perusahaan Gas Negara (Persero) Tbk showed a lower risk and more stable stocks and are not affected by oil price fluctuations. Based on types of investors to look at the risk profile, the type of defensive investor will invest in stocks with low comovement namely Perusahaan Gas Negara (Persero) Tbk. While an aggressive type of investor will tend to pick stocks with high comovement to oil prices as Adaro Energy Tbk because they bring in more returns Topic: Interdisciplinary Physics 106 Electrical Characteristic Comparison of Corona and Dielectric Barrier Discharges with Multi Points to Plane ConfigurationMuhammad Nur, Nazhira Shadrina, Fajar Arianto, Sumariyah Center for Plasma Research, Faculty of Science and Mathematics, Diponegoro University Abstract Atmospheric non-thermal plasma has been widely used. The aims of this research are to characterize electrical properties and charge carrier mobility of corona discharge and dielectric barrier discharge (DBD). Multipoint?to?plane configuration plasma reactors has been used both for corona discharge and DBD. Plasma is generated by high voltage DC and 2 mm glass as dielectric barrier covers passive electrode surface. Plasma current and voltage were measured using multimeter and oscilloscope. Experimental measurements of the current (I) and voltage (V) shows that I is proportional to V2. The relationship between I and V follows the saturation current formula. The number of points (N) greatly affects the measured current value. The presence of glass dielectrics placed above the plane electrode as a barrier also affects the measured current on DBD. Calculation of charge carrier mobility, we use the uni-polar saturation current formula from Sigmond, by first modifying it by considering the dielectric permittivity of the barrier and the active electrode in the form of multipoint. This is new empirical formula for current saturation. In this research with 64 points as active electrode, we found that charge carrier mobility in air for corona within range from 1.66 cm2/V.s to 7.18 cm2/V.s. By using the same reactor and putting a 2 mm thick glass above the passive electrode, we found that the mobility charge curries on DBD within range from 0.331 cm2/V.s to 0.848 cm2/V.s. The most interesting thing is the charge currier mobility at the corona decreases with enlarged the distance between the electrodes, but in contrast, at the DBD, by increasing the gap between electrodes, the charge curries mobility also increases. However, for every distance in this experiment, the charge curries mobility in corona discharge is much greater than the charge curries mobility in DBD. Topic: Interdisciplinary Physics 107 Effect of solution molarity and post-annealing on optical band gap of Al doped ZnO thin filmsA.R.A. Rashid, T.N.H.T. Mazlam, N.S. Othman, K.A. Dasuki Faculty of Science and Technology, Universiti Sains Islam Malaysia, 71800, Nilai, Negeri Sembilan, Malaysia Abstract Undoped and Al-doped ZnO thin films have been prepared by the sol?gel method. Zinc acetate dihydrate, ethanol and monoethanolamine were used as precursor, solvent and stabilizer, respectively. In the case of molarity study for Al-doped ZnO, aluminum nitrate nonahydrate was added to the precursor solution from 0 at.% to 6 at.% at molarity of 0.1 M and 0.2 M. For post-annealing study, the quantity of Al in the sol was varied from 0 at.% to 3 at.% with annealing temperature of 450?C, 500?C and 550?C. The optical properties were characterized using UV-Vis where the band gap of undoped ZnO increases as the annealing temperature increase and the band gap decrease as the molarity increment. Meanwhile the band gap increase upon increment of Al dopant. The effect of annealing, molarity and dopant percentage on the thin film gives a different value of energy band gap. Topic: Interdisciplinary Physics 108 Highly Easy and low cost Fabrication of Gaphite-based Flexible Transparent Conducting FilmDui Yanto Rahmana, Sutisna, Fisca Dian Utami, Euis Sustini and Mikrajuddin Abdullah Department of physics Faculty of Mathematics and Natural Science Bandung Institut of Technology Jl. Ganesha 10 Bandung 40132, Indonesia duiyantorahmanssi[at]gmail.com, mikrajuddin[at]gmail.com Abstract We demonstrated extraordinary easy and low cost fabrication of flexible transparent conducting film (TCF) using graphite powder as conducting material. The method is ignoring heating and transfer process which is commonly used in fabrication of transparent conducting film. Graphite powder is directly and manually deposited onto the transparent plastic by using tube-shaped metal which its round surface covered with tissue of 2 mm thick. The deposition of graphite powder was performed by circle motion of 20 movements for one coating or one layer. Numerous layers of graphite film were coated on the previous stacked layer to increase TCFs conductivity. Resistivity and transmittance measurement of TCF were performed by four point probe method and UV-Vis equipment respectively. It is confirmed that graphite TCF achieved the resistivity of 0.98 ohm.cm and transmittance of 60% for one coating, while 40 times coating resulted the resistivity of 0.17 Ohm.cm and transmittance of 4.6%. Although its transmittance still has a room to be improved higher, our method is very promising for future up scalable production of transparent conducting film owing to its highly easy process and effective cost. Topic: Interdisciplinary Physics 109 Photocatalys Based TiO2 and Its Application in Organic Wastewater Treatment Using Spray MethodFisca Dian Utami, Sutisna, Dui Yanto Rahman, Mikrajuddin Abdullah Physics Department of Institut Teknologi Bandung Abstract In present research, we reported a succesfull coating of TiO2 particle on the transparent plastic which applied in principle photocatalyst by spray method. This method was employed to degrade organic wastewater (Methylene Blue) under solar exposure. A total of 300 ml of blue methylene was used in the photocatalyst test. From the absorbance spectrum and the degradation rate of methylene blue it was show that the blue methylene successfully degraded about 95% in 2 days of irradiation. The result suggests a faster rate of degradation than previously reported studies. This method is selected because it is simple, environmentally friendly, reasonably priced, and has the potential to continue to be developed. Topic: Interdisciplinary Physics 110 A Facile Microwave-Assisted Synthesis of Carbon Dots and Their Application as Sensitizers in Nanocrystalline TiO2 Solar CellsIlham Alkian, Adi Prasetio, Ledi Anggara, Karnaji , Rizka Zakiyatul Miskiyah, Fonisyah Marspianko Habibah, Hendri Widiyandari Diponegoro University Abstract Sensitizers play an important role in dye-sensitized solar cell (DSSCs) to harvest photons and convert them to electrons assisted by semiconducting photoanode. Nowaday, ruthenium complex is the most common used as sensitizer due to its broad light absorption. However, the ruthenium material is very expensive due to its rare materials and complex synthesis process. Herein, we demonstrate the facile microwave-assisted method to synthesize of the carbon-dots (C-dots) and utilize them as sensitizers in the DSSCs. The C-dots are synthesized by mixing 48 g of urea, 24 g of citric acid and 180 mL of aquades acid. The C-dots are synthesized using a microwave at 450 W for 15, 30, and 45 min. The C-dots emit green light induced by exposure to ultraviolet (UV) light. The absorbance peaks are increasing from 408, 414 and 420 nm repectively corresponding to 15, 30, and 45 min of C-dots heated by microwave radiation. On the other hand, the C-dots have broad absorbance range, especially at visible light range. The second lower peak should be caused by phi to phi* transition at aromatic sp. C-dots show low transmittance at 3460, 1661 and 1455 cm-1 repectively corresponding to group functions of amine N-H vibration, alkene C=C vibration, C-O and N-O. The peaks from 1230 to 1161 cm-1 show different vibration modes of carboxyl, ester, ether and alcohol moeties. The research shows that the wavelength of the C-dots decreases and the band gaps of c-dots increase as the heating time in microwave get longer. The increases of band gap informs that the C-dots size get smaller. The DSSCs devices are characterized under solar simulator AM 1.5G illumination at 100 mW/cm2 light intensity. The results 0.067% of the power conversion efficiency (PCE) and 0.34 of the fill factor (FF) are reached as the highest performance reached in this study. Additionally UV-vis spectra shows broad light absorption throughout the visible light with the band gap of about 2.68 eV. The results show that the c-dots synthesized using facile method have emerged as alternative photosensitizer due to its broad light absorption comparable to ruthenium-based dye. Topic: Interdisciplinary Physics 111 The Effect of Ozone Dielectric Barrier Discharge (DBD) Towards Reduction of Microorganism in EggsSiti Mudrikah, Nita Melinda, Norma Faizatun Nikmah, Ilham Alkian, Siti Magfiroh, Zaenul Muhlisin Diponegoro University Abstract Food materials for example eggs have a fairly high nutritional content, especially protein. However, eggs can be easily damaged. They will experience quality decrease within 14 days stored at room temperature. Moreover, they will rot fast because it is easily contaminated with microorganisms. There are many ways to prevent rottenness in eggs, such as conventional techniques of salting, fumigation, or by immersion in an extract, but all of those ways do not produce satisfactory results. The purpose of this study is to know the effect of ozone gas exposure using Dielectric Burrier Discharge (DBD) method towards the reduction of microorganisms in eggs. Ozone, as a powerful oxidizer, is expected to be used as a desinfectant for algae, fungi, and bacteria. This study uses four samples, without ozonation (A), 10 minutes of ozonation (B), 20 minutes of ozonation (C) and 30 minutes of ozonation (D). Each of samples was observed during 7 day. The result of Total Plate Count (TPC) of Salmonella Sp. on the shell of the samples A, B, C, and D respectively TBUD, TBUD, 2.2 x 105cfu/ml, 1.6 x 105cfu/ml, whereas in successive contents TBUD, TBUD, 2.1 x 105cfu/ml, 1.5 x 105cfu/ml. The result of TPC test of whole bacterial colonies on sample shells A, B, C, D were 2.9 x 105cfu / ml, 1.6 x 105cfu/ml, 0.9 x 105cfu/ml, 0.73 x 105cfu/ml, whereas in successive contents TBUD, 2.4 x 105cfu/ml, 1.7 x 105cfu/ml, 0.7 x 105cfu/ml. From the result above, it can be concluded that the most effective time on adding the ozonation is on sample D, which is exposed for 30 minutes. This also corresponds to other test results such as pore density test, hock test, and texture test. This research is expected to introduce ozone technology as a solution in extending the storage time and reducing the possibility of microbial contamination in eggs. Topic: Interdisciplinary Physics 112 SOCIALIZATION OF LANDSLIDE HAZARDS AT KAIRO HILL - INFRASTRUCTURE TOURISM IN TANA TORAJAL. Pasasa1, a), L. Hendrajaya1, I. Permanasari1, and D.Pandara2) 1Earth Physics and Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung 2 Faculty of Mathematics and Natural Sciences, Universitas Sam Ratulangi, Manado a)Corresponding author: lpasasa[at]fi.itb.ac.id Abstract Concept of disaster management and knowledge on hazard phenomena in Indonesia is to develop the understanding and awareness, so they can be further motivated and empowered to develop effective geological hazard disaster management as well as public education programs. The landslide hazard mitigation strategy aim to reduce number of live, socio and economics losses caused by Landslide. Therefore, socialization of landslide hazards is a crucial step towards empowerment of human resources to guarantee the sustainable life and environment in the hazard vulnerable area, especially at Kairo Hill, Tana Toraja. The step of the strategy are: Landslide susceptibility, mapping, early warning system, monitoring landslide, and socialization. Topic: Interdisciplinary Physics 113 Investigation of Conceptual Understanding of Pre-Service Science Teachers in Integrated Science SubjectNanang Winarno, Ari Widodo, Dadi Rusdiana, Diana Rochintaniawati, Ratih Mega Ayu Afifah Universitas Pendidikan Indonesia Abstract The aim of this study is to investigate the conceptual understanding of pre-service science teachers in integrated science subject. This research is a descriptive research. Sample used in this research is 42 pre-service science teacher one of university in Bandung, Indonesia. The results of this study is the conceptual understanding of pre-service science teachers in integrated science subject on several topics is still low. Most of the pre-service science teachers explain the answers of some questions only in the Physics, Biology, or Chemistry point of view and still have not been able to explain a problem by integrating from some subjects (Physics, Biology, and Chemistry). The recommendation of this research is to develop integrated science textbooks at the university level. Topic: Interdisciplinary Physics 114 Measurement and analysis of U-233 from Local Thorium Irradiated at Kartini Reactor by Using Gamma Spectrometry and DNC MethodsSyarip, Susilo Widodo, Muzakky, Sukirno Centre for Accelerator Science & Technology, National Nuclear Energy Agency Abstract The measurement and analysis of U-233 from irradiated local thorium sample by gamma spectrometry and fission-induced delayed neutron counting (DNC) method have been done. The main goal of this experiment was to explore possibilities of U-233 determination in the irradiated thorium for its future use in SAMOP reactor. Some ThO2 samples of 0.1 gram were irradiated at the Kartini reactor at average neutron flux of 10^12 n cm^-2s^-1 and cooled down for 55 days before counted by gamma spectrometry where U-233 determined indirectly by gamma peak counting of Pa-233. The samples then re-irradiated to determine U-233 by using DNC method. The analysis result both by using gamma spectrometry and DNC methods were 10.10 +/- 0.96 micro gram and 17.22 +/- 1.85 micro gram of U-233 in average. Of the two gamma spectrometry and DNC methods both provided results in somewhat relatively good agreement with the calculated amounts of U-233 using ORIGEN2 computer code i.e. 14.3 micro gram. The detection limit of DNC and the efficiency of detection system measured are 0.006 micro gram and 6.39 +/- 0.07% respectively, and the efficiency of gamma spectrometry system is 18%. Topic: Nuclear Science and Engineering 115 Influence of GA Siwabessy Reactor Iradiation Period on The Production of Molybdenum-99 (99Mo) by Neutron Activation to Produce Technetium-99m (99mTc)M Munir, Herlina, Sriyono, E Sarmini, Abidin and Marlina Center for Radioisotope and Radiopharmaceutical Technology, National Nuclear Energy Agency Abstract The production of 99Mo by neutron activation method in multipurpose reactor GA Siwabessy is an alternative solution to overcome 99Mo shortage, particulary in Indonesia. The aim of this study is evaluating the influence of an irradiation period of the reactor on the quality parameters of 99Mo and 99mTc. A natural molybdenum was packed in quartz ampule and aluminium capsule, irradiated in the research reactor for around 100 hours. Whereas the 99Mo - 99mTc separation was conducted in Center for Radioisotope and Radiopharmaceutical Technology using zirconium-based material (ZBM). Both the obtained 99Mo activity and 99mTc yield percentage were influenced by the irradiation period. On the other hand, both the adsorption capacity of ZBM and quality parameters of 99mTc were not influenced by the irradiation period. Topic: Nuclear Science and Engineering 116 Calculating the Binding Energy of the Lithium Nucleus with the Yukawa Potential and the Hellmann Potential using WKB ApproximationAhmad Suaif (a*), Dina Rahmawati (b) a) Theoritical High Energy Physics and Instrumentation Research Division, Physics Department, Bandung Institute of Technology 40132, Indonesia *ahmadsuaif[at]s.itb.ac.id b) Electronic Material Research Division, Physics Department, Bandung Institute of Technology 40132, Indonesia Abstract It had been conducted the solving of the Schodinger equation for 6-body particle system to determine the binding energy of the Lithium nucleus using two different potentials, The Yukawa Potential, and The Hellmann Potential. To ease the calculation process was used the WKB Approximation. It was shown that the binding energy of Lithium equals to 32.00 MeV with the error was 0.02% compared to the experimental reference values for each parameter where a = 0.8 and Vo = 40 MeV Topic: Nuclear Science and Engineering 117 RADIATION SHIELDING DESIGN OF NEUTRON SOURCE OF "SAMOP" RADIOISOTOPE PRODUCTION TEST FACILITYTegas Sutondo, Syarip Center for Accelerator Science and Technology (CAST), National Nuclear Energy Agency Abstract The most common radioisotope used in diagnosis for medical imaging in nuclear medicine is Tc-99m which is daughter isotope of Mo-99. A subcritical assembly for Mo-99 production (SAMOP), fueled with uranyl nitrate solution has been designed to be operated by using external neutron source. The SAMOP experimental or test facility is a facility to be used for performance testing of the SAMOP system by using neutron source from radial beam port of Kartini nuclear reactor. This paper presents the results of the radiation shielding design and calculation for external neutron source of SAMOP experimental facility. The method used is a modeling and calculation by using MCNPX computer code. Based on the assumed source terms, the materials being used, and the geometrical arrangements, it is concluded that by using paraffin of 60 cm thickness for the beam catcher and 50 cm for the concrete of the outer shield would be sufficient to reduce the radiation dose below the maximum recommended limit. The presence of beam catcher can significantly reduce the contribution of neutrons and secondary particles to the radiation dose. Topic: Nuclear Science and Engineering 118 (Th,U)O2 Homogeneous Fuel Utilization on High Temperature Test Reactor 30MWtAnni Nuril Hidayati1, Abdul Waris2*, Dwi Irwanto2, and Asril Pramutadi2 - Abstract - Topic: Nuclear Science and Engineering 119 (Th,Pu)O2 Homogeneous Fuel Utilization on High Temperature Test Reactor 30MWtAnni Nuril Hidayati1, Abdul Waris2*, Dwi Irwanto2, and Asril Pramutadi2 - Abstract - Topic: Nuclear Science and Engineering 120 NEUTRONIC CHARACTERISTICS OF SUBCRITICAL ASSEMBLY FOR MO-99 PRODUCTION (SAMOP) TEST FACILITYAzizul Khakim, Syarip , Suharyana 1Badan Pengawas Tenaga Nuklir (BAPETEN), Jl. Gajah Mada No.8 Jakarta 10120 2Pusat Sains dan Teknologi Akselerator (PSTA)-BATAN, Jl. Babarsari Kotak Pos 6101 Yogyakarta 55281 3Fakultas Matematika dan Ilmu Pengetahuan Alam-Universitas Sebelas Maret, Jl. Ir. Sutami No. 36A Surakarta 57126 Abstract SAMOP (Sub-critical Assembly for Mo-99 Production) is a system of sub-critical solution which is aimed at producing Mo-99 isotope through a process of the fission reaction. Mo-99 is a generator of Tc-99m isotope which is the most isotope used in nuclear medicine. In order to sustain the fission process of the sub-critical system, an external neutron source is needed. The external neutron source for the SAMOP test facility comes from one of the Kartini reactor beam ports. The system shall ensure the sub-critical state at any condition with adequate margin. Any conditions or events that could lead to reactivity change have to be identified, such as the change in fuel solution concentration, either due to leakage, evaporation or heating process. System code of MCNP and MVP were used to analyze the neutronic characteristics of SAMOP test facility. The analysis was intended to determine the neutronic characteristics of SAMOP system, such as under-moderated range, uranium concentration and the allowable number of solution tubes or TRIGA reactor fuels inserted into peripheral holes to keep the core subcritical at any condition. From the calculations, the preferable nominal uranium density is 300 g U/L. Topic: Nuclear Science and Engineering 121 Performance of Thorium Uranium Nitride (Th,U233)N Fuel for 500 MWth GFR Long-Life Without Refueling use FI-ITB-CHI codeRatna Dewi Syarifah, Zaki Su?ud, Khairul Basar and Dwi Irwanto Nuclear Physics and Biophysics Research Division, Physics Department, Faculty of Mathematics and Natural Science, Bandung Institute of Technology Indonesia, Jalan Ganesha 10 Bandung 40132, INDONESIA Abstract Performance of Thorium Uranium Nitride Fuel for 500 MWth GFR Long-Life Without Refueling use FI-ITB-CHI code has been done. Gas Cooled Fast Reactor use fast neutron spectrum, and belong to one of fast breeder reactor type. Thorium is three up to four times more abundant than uranium and is widely distributed in nature can be obtained in many countries. Natural thorium does not contain any fissile material and is made up of the fertile Th-232 isotope only. Thorium fuel and fuel cycles are particularly relevant to countries having large thorium like Indonesia. The calculation use FI-ITB-CHI Code which has been verified by SLAROM code. The core calculation use R-Z geometry dimensional. The multi group diffusion calculation is carried out every year to get neutron flux distribution and power distribution. Then burn up calculation is carried out for each spatial mesh. libraries. The reflector radial-axial width is 50 cm. The variation of fuel volume fraction is 40% until 65%, cladding 10%, and moderator 25% up to 50%. There is three variation fuel in the core reactor, i.e. Fuel 1 (F1) is 7.8% percentage of U233, Fuel 2 (F2) 8% percentage of U233, and Fuel 3 (F3) 8.8% percentage of Plutonium. All case can reach burn up time plus than 20 years. The power density distribution of heterogeneous core configuration is flatter than homogeneous core configuration. Topic: Nuclear Science and Engineering 122 Characteristics of YSZ Thin Film on SS316L Deposited Using Pulsed Laser Deposition: Preliminary StudyAbu Khalid Rivai and Mardiyanto Center For Science and Technology of Advanced Materials, National Nuclear Energy Agency of Indonesia (BATAN) Abstract One of the main characteristics of advanced nuclear reactors system is higher temperature operations due to higher thermal efficiency target. Therefore, deployments of high temperature materials are one of the key issues for the development of the reactors. Steels are one of established and reliable materials for cladding and structural of nuclear reactors. However, steels have service temperature limitation which in general is only up to 600 C. Therefore, improvement of steels for higher temperature operation is needed. YSZ ceramic-coated steels are one of the candidate materials for that purpose. In this study, thin film YSZ (Ytrria-Stabilized Zirconia) ceramic has been deposited on an austenetic steel SS316L using Pulsed Laser Deposition (PLD) at laboratory facilities of Center For Science and Technology of Advanced Materials-National Nuclear Energy Agency of Indonesia (BATAN). The thin film was deposited with the chamber pressure of ~200 mTorr, the substrate temperature of 800 C, and the number of laser shots of 90,000. Afterward, the samples were analyzed using Optical Microscope (OM), Scanning Electron Microscope - Energy Dispersive X-ray Spectroscope (SEM-EDS), X-Ray Diffractometer (XRD), and Atomic Force Microscope (AFM). The results showed that the YSZ ceramic thin film could homogeneously and sticky deposited on the surface of the SS316L with very smooth surface. Topic: Nuclear Science and Engineering 123 Experiments on natural convection as a coolant system mechanism on nuclear reactorsHabibi Abdillah, Novitrian Institut Teknologi Bandung Abstract The nuclear reactor accident at Fukushima occurred because the pump on the cooling system did not work. Next-generation nuclear reactors are expected to have a cooling system that remains functional even when the pump is not working. Natural convection becomes an option that can be used to flow the coolant without using a pump. Natural convection is a fluid flow phenomenon that occurs due to differences in density. The research was conducted to study the effect of the temperature difference on the flow rate of coolant. Previous experiments have been carried out to determine the flow rate of refrigerant to the height of the cooling system, but have deficiencies in the measurement of the flow rate of the coolant. Topic: Nuclear Science and Engineering 124 High Temperature Oxidation of Fe-Cr-Al Coating Prepared by a Flame Spray TechniqueAtthur El Fath1, Irmaniar2, Didik Aryanto2, Sitti Ahmiatri Saptari1, Toto Sudiro2* 1Physics Department, Science and Technology Faculty, Universitas Islam Negeri Syarif Hidayatullah Jakarta 2Research Center for Physics, Indonesian Institute of Sciences Corresponding Author: toto011[at]lipi.go.id Abstract In the present study, the Fe-Cr-Al coatings containing 0 and 30 at.% Al content were prepared by a flame spray technique. The coatings were then annealed in vacuum at 800oC for 2h. To evaluate the coating oxidation resistance, the high temperature cyclic oxidation test was performed at 800oC for up to 8 cycles. XRD and SEM-EDS were used to characterize the oxidized samples. The results show that the carbon steel is susceptible to high temperature oxidation. A thick Fe-oxides layer was formed on the steel surface. On the contrary, the Fe-Cr-Al coatings play a role in improving the oxidation resistance of low carbon steel. The FeCr coating with 30 at. % Al content exhibits the lowest mass gain after exposure for 8 cycles at 800oC. Topic: Nuclear Science and Engineering 125 Preliminary Development of Coupled Neutronic - Thermalhydraulic Computer Code for Multipass Fuel Loading Scheme of Pebble Bed ReactorDwi Irwanto, Sidik Permana, Syeilendra Pramuditya, Asril Pramutadi Nuclear and Biophysics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia Abstract Pebble Bed Reactor (PBR) is one of the most promising nuclear reactor design due to its advantages on neutronic, thermalhydraulic and safety aspects. Indonesia, currently having interest to develop this type of reactor, therefore in-house analysis tools for PBR need to be developed. This computer code have to treat both neutronic and thermalhydraulic aspects in coupled due to its strong connection. As a first step, a code for thermalhydraulic calculation are under development and using methods proposed by Stroh. Meanwhile, neutronic calculation are using Monte Carlo MVP code. Development progress for this coupled neutronic and thermalhydraulic code for PBR are reported in the present study. Topic: Nuclear Science and Engineering 126 Development of Accident analysis of Gas Cooled Fast Reactors and its application in Cluster ComputerZaki Su?ud1, Fitria Miftasani1, Menik Ariani2, Dwi Irwanto1 1Nuclear and Bophysics Research Divisions, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology 2Department of Physics, Sriwijaya University, Palembang, Indonesia Abstract Accident analysis if important to verify inherent safety capability of Generation IV Nuclear Power Plant. Gas cooled fast reactors is one of the Gneration IV Nuclear Power Reactors. Here full scale accident analysis code for gas cooled fast reactos has been developed. The code include couple between space-time kinetic and transient thermohydraulic over the reactor core and supporting system. The nuclear reactor system considered here include reactor core, steam generator, pump, and passive decay heat removal system. The space time ?kinetic of adiabatc approach is adopted here for gas cooled fast reactors for optimal computational time and simulation accuracy. Transient thermal hydraulic calculations include transent heat conduction in fuel, transient heat transfer in fuel channel, heat exchanger calculations using quasistatic approach, and decay heat removal calculations. Overal calculations are implemented in fortran program and optimized for cluster computer Topic: Nuclear Science and Engineering 127 Neutronics Analysis of AP1000 Nuclear Reactor with ThO2-UO2 FuelR. F. Baskara1,a , A. Waris2*, R. Kurniadi2, K. Basar2, Widayani2 , S. Şahin3 - Abstract - Topic: Nuclear Science and Engineering 128 Plutonium Recycling in Advanced Nuclear ReactorAP1000 with Thorium FuelA. Waris1*, R. F. Baskara2,a, D. Irwanto1, Nur Asiah A1, Novitrian1, A. Abdelouas - Abstract - Topic: Nuclear Science and Engineering 129 Plutonium and Minor Actinides Utilization in FUJI-U1 Molten Salt ReactorCici Wulandari1, Abdul Waris2*, Sidik Permana2, and Syeilendra Pramuditya2 - Abstract - Topic: Nuclear Science and Engineering 130 Simulation of lower plenum material interaction between molten uranium and control rod guide tube (CRGT) of a BWR during severe accident by using MPS method(a) Asril Pramutadi Andi Mustari, (a) Dwi Irwanto (a) Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, Indonesia Abstract Melting process of the Fukushima accident has not been well analyzed due to difficulties of obtaining information from the BWR reactor. At the lower plenum, BWR reactor is full of control rod guide tube (CRGT), thus interaction of molten uranium with the CRGT is most likely to occur during the severe accident. MPS method was proposed to be used to simulate the process since the method is powerful enough of handling interface with dynamic transformation. The diffusion coefficients used in this study were 8.0E-9 m2/s and 2.240E-9m2/s for U to Fe and Fe to U, respectively. The temperature of the molten uranium and SS304 was 1450 C with average distance between particles of about 0.0001 m. The study found that it takes 3.7 seconds for molten uranium to penetrate 1.1 mm thick CRGT walls with the penetration rate of 329 um/s. Topic: Nuclear Science and Engineering 131 Comparative Analysis on Fuel Breeding for Less Moderation Ratio of Water-Cooled ReactorSidik Permana *, Asril Pramutadi, Syeilendra Pramuditya, Dwi Irwanto 1Nuclear Physics and Bio Physics Research Group, Bandung Institute of Technology Gedung Fisika, Jl. Ganesha 10, Bandung 40132, Indonesia. * Email: psidik[at]fi.itb.ac.id Abstract Nuclear fuel breeding aspect of water-cooled reactor become one of the important issues to extend the sustainability aspect of nuclear fuel in line with fast breeder reactor program with closed fuel cycle concept. Utilization of transuranium fuel in water-cooled reactor is one of the option to optimize nuclear fuel utilization as additional resource fuel in conjunction with uranium fuel utilization. Fuel sustainability aspect of nuclear fuel will be analyzed in the present study based on a water cooled reactor with uranium and transuranium fuels as supply fuels with ligh and heavy water as coolants. Ratio of moderator to fuel ratio is set to be low arrangement to have more harder spectrum to enhance fuel breeding capability of water cooled. Some actinides such as plutonium are investigated to show the composition effect to fuel breeding capability which is based on plutonium vector composition. Possible fuel breeding capability can be achieved by the present water cooled reactor for both light and heavy water coolant systems. Higher possible fuel breeding capability can be achieved for less moderation ratios and some contributions from recycled fuel of spent fuel. In addition, some plutonium isotopes contribute to increase fuel breeding capability for both water coolants. Heavy water coolant has better plutonium production which achieves more fuel breeding because of harder neutron spectrum. Some transuranium recycling schemes show better fuel breeding capability as well as more plutonium isotopes production. Topic: Nuclear Science and Engineering 132 Actinide and Plutonium Composition Analysis on Water-Cooled ReactorSidik Permana *, Asril Pramutadi, Syeilendra Pramuditya, Dwi Irwanto 1Nuclear Physics and Bio Physics Research Group, Bandung Institute of Technology, Gedung Fisika, Jl. Ganesha 10, Bandung 40132, Indonesia. * Email: psidik[at]fi.itb.ac.id Abstract Reduction volume of spent nuclear fuel (SFN) as well as a program to optimize a re-use schemes of some SFN can be maintained which has some advantages to be used as additional fresh nuclear fuel for sustainability of nuclear fuel and for nuclear proliferation resistance purposes. Some transuranium compositions which consist of plutonium and minor actinide (MA) give some potentials to be used as recycled fuel which can be combined with uranium and thorium fuel cycle systems. Fuel sustainability aspect of nuclear fuel will be analyzed in the present study based on a water cooled reactor with uranium and transuranium fuels as supply fuels with ligh and heavy water as coolants. Ratio of moderator to fuel ratio is set to be low arrangement to have more harder spectrum to enhance fuel breeding capability of water cooled. Some actinides such as plutonium are investigated to show the composition effect to fuel breeding capability which is based on plutonium vector composition. Possible fuel breeding capability can be achieved by the present water cooled reactor for both light and heavy water coolant systems. Higher possible fuel breeding capability can be achieved for less moderation ratios and some contributions from recycled fuel of spent fuel. In addition, some plutonium isotopes contribute to increase fuel breeding capability for both water coolants. Heavy water coolant has better plutonium production which achieves more fuel breeding because of harder neutron spectrum. Some transuranium recycling schemes show better fuel breeding capability as well as more plutonium isotopes production. Topic: Nuclear Science and Engineering 133 OSW-CTST: A Developing Study of Oscillation and Sound Wave-Critical Thinking Skills TestSyarif Rokhmat Hidayat*, Anggi Hanif Setyadin, Satria Seto Bhakti, Aldi Zulfikar, Ida Kaniawati, Endi Suhendi, Parsaoran Siahaan, Didi Teguh Chandra, Achmad Samsudin Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *syarif.rokhmat.h[at]student.upi.edu Abstract Nowadays, the main goal of education in the world is required to promote critical thinking skills for junior high school students in term of being better future-live. To analyze students critical thinking skills, we developed critical thinking test items on Oscillation and Sound Wave named Oscillation and Sound Wave-Critical Thinking Skills Test (OSW-CTST). The aim of this study is to develop the test of critical thinking skills through the development model. The development model which is utilized is ADDIE (Analyze, Design, Development, Implementation, and Evaluation). The OSW-CTST items have already been developed through Ennis s indicators of critical thinking skills. The critical thinking indicators which were utilized in this study are: (1) identifying/formulating the criteria of possible answers, (2) identifying reasons or premises, (3) explaining the hypotheses, (4) defining the scientific terms and considering the definitions, and (5) choosing the possible criteria as a solution to the problems. On validity test to experts, the OSW-CTST get the score greater than 4.3 of 5 and 80% of test items are valid based on the trials test to some sample of students. The difficulty of distinguishing power value and criteria are good enough too. In conclusion, critical thinking skills on oscillation and sound wave could be well developed though ADDIE model and it could measure the junior high school students critical thinking skills. Topic: Physics Education 134 MITIGATION OF MOUNT MERAPI BASED BY ETHNOSCIENCECherly Salawane (a*), Putut Marwoto (b), Supriyadi (b), Sudarmin (b), Ani Rusilowati (b) a. Student of Doctoral Program of Science Education, Graduate Program of Semarang State University, Semarang 5000, Indonesia. *salawanecherly[at]yahoo.co.id b. Department of Physics, Faculty of Mathematics and Natural Sciences, Semarang State University, Campus Sekaran Gunungpati, Semarang 50229, Indonesia. Abstract Ethnoscience is a system of knowledge and cognition typical of a given culture. Ethnoscience examines human behavior towards the environment in terms of objects viewed through cultural aspects and perceptions of local communities. For people living around the slopes of Mount Merapi, the danger of Merapi eruption is not a serious threat that should be feared even Merapi eruption is considered as a boon. Until now people still believe in the myth of Mount Merapi. Ethnosciences approach is used for disaster mitigation as a step to minimize the risk, as a result of the volcanic activity of Mount Merapi. The purpose of this study is to analyze local science and scientific science community to the dangers of Mount Merapi. This type of research is a qualitative research where data collection is done by observation and depth interviews with people who are on the slopes of Mount Merapi. Belief in the Guardian of Merapi (ethnoscience) is still very high, where people still perform ritual ceremonies every year as a form of worship of the ruler of Mount Merapi. The results show that the ethnoscience or original science community has a greater impact on disaster mitigation than scientific science. The community performs the "Upacara Sedekah Gunung Merapi" to offer offerings to Kyai Petruk or known as "Mbah Petruk" who live in Merapi. Where Mbah Petruk is believed to be one of the Merapi rulers who give a sign when there will be an eruption or disaster. When the Merapi eruption occurred in 2010, there was a hot cloud "Wedhus Gembel" which resembles the head of Mbah Petruk face to the city of Yogjakarta. Topic: Physics Education 135 Implementation of Integrating Tracker in Level of Inquiry to Enhance Seven Grade Student Science Process Skills and Graph InterpretationMuh.Wahyudi (a,b*), Setiya Utari (a), Selly Feranie (a) a) Department of Physics Education, School of Postgraduates, Indonesia University of Education, Bandung 40154, Indonesia *yudifisika33[at]gmail.com b) Madrasah Tsanawiyah NW Pringgajurang, Lombok Timur-NTB 83664, Indonesia Abstract A Learning design integrating tracker in level of inquiry has implementation to improvement of seven grade student science process skills and graph interpretation. The research design used is one group pretest-post test 28 seven grade student in one Islamic junior high school (MTs) in East Lombok are involved in this study. The instrument used to test the ability of the graph is by the standard TUG-K test (Test of Understanding Graph in Kinematics), and to test students science process skills is the standard test TIPS II (Test of Integrated Process Skills II). The results of this study show on the understanding of the graph is 0.52 in the medium category, and on the science process skills is 0.702 in the high category. Implementation of this learning strategy can significantly improve the science process skills and understanding of the graph and based on the result suggest that this learning design can be an alternative to improve student science process skills and graph interpretation in learning linear motion. Topic: Physics Education 136 Overcoming Senior High School Students Misconceptions on Newtons Laws: A Dual-Situated Learning Model (DSLM) with Inquiry LearningNuzulira Janeusse Fratiwi, Ida Kaniawati, Endi Suhendi, Iyon Suyana, Achmad Samsudin Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia Abstract Now a day, several problems regarding to the misconceptions still occurred in the physics learning, especially in mechanical concept, such as Newtons Laws. The aim of this research is to overcoming students misconceptions on Newtons Laws through combining Dual-Situated Learning Model (DSLM) and inquiry learning. The research has been utilized the ADDIE model, stands for: Analyzing, Designing, Developing, Implementing and Evaluating. The subjects who involved in the research are 20 senior high school students (10 boys and 10 girls, their ages were an average of 16 years-old). The instrument used in this research is eight question of Four-Tier Newtonian Laws (FTNT). At the developing phase, we have been developing the Dual-Situated Learning Model (DSLM) which is combined by inquiry learning. At the evaluating phase, we obtained the data about students misconceptions of forces concepts are decreased sharply. To sum up, the combining DSLM and inquiry learning are effective to overcome the misconceptions of senior high school students on Newtons Laws. Topic: Physics Education 137 The Relationship between Students Interest in Bilingual Science Learning and Students English CompetenceRegina Lichteria Panjaitan and Riana Irawati Universitas Pendidikan Indonesia Abstract The correlation of students interest in bilingual science learning and their English competence was investigated. Forty-four students of elementary-school teacher candidate program participated in this study. The students received five topics of science (Heat, Changes in Matters, Plant Life and Environment, Simple Machine, Animal Life and Environment) with English usage embedded. The students interest in science learning involving English was examined. Meanwhile, the students mastery of general English was measured. The result shows that the students interest in bilingual science learning and their English mastery is not significantly correlated. The finding suggests that the students might still enjoy and get benefit from bilingual science learning despite their English abilities. This leads to the opportunity to have more bilingual science classes to enhance not only students science mastery but also their English competence. Topic: Physics Education 138 The Effect of Higher Order Thinking Virtual Laboratory (HOTVL) in Electric Circuit on Students Creative Thinking SkillsSapriadil, Agus Setiawan, Andi Suhandi Universitas Pendidikan Indonesia Abstract Creative thinking skill is one skill that is very needed in the 21st century. Therefore, development of creative thinking skills through physics teaching and learning is important. This research applies higher order thinking virtual laboratory (HOTVL) on the topic of electric circuit to facilitate students Topic: Physics Education 139 Analysis profile metacognition in Physics-Based Learning Problem Solvingcucu cahyati dan Dadi Rusdiana School of Graduate Studies, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudi No. 229, Bandung 40154, Jawa Barat, Indonesia Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No.229 Bandung 40154, Jawa Barat, Indonesia Abstract Preliminary study results show that metacognition is not much revealed in the learning process while the competency standards to the curriculum in 2013 in Indonesia has provided illustrations metacognition development at the high school level in addition to the ability of factual, conceptual and procedural. The purpose of this study to see how the profile metacognition owned by the students and the extent to which students can engage in learning metakognisinya physics-based problem solving in the energy discussion topic. This research was conducted in a high school grade XI at 36 students. The findings of this study indicate that in learning physics-based problem solving metacognition can involve students in the process of solving problems through Constructive Connectivity, Monitoring-evaluation-planning, and Control of concentration during the learning takes place. Topic: Physics Education 140 Reducing Eleventh-Grade Students Misconception on Gravity Conceptions using PDEODE*E-Based Conceptual Change ModelAldi Zulfikar1, Duden Saepuzaman1, Neni Hermita2, Achmad Samsudin1 1Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia 2Program Studi PGSD, Universitas Riau, Pekanbaru, Indonesia Abstract Students misconception is one of learning problems that able to inhibit their learning achievement. One of the fundamental subjects in the physics learning is a force concept, such as gravity. This study was conducted to reduce students misconceptions on gravity concept through PDEODE*E-based Conceptual Change Model (CCM). The gravity concept in this study is on the falling ball in several different cases.The participants of this study consisted of 38 eleventh-grade students of Senior High School in Bandung City. The students misconception was detected using 4-tier formed Force Concept Inventory (FCI) as the diagnostic instrument test. The result of this study shows that students misconception on gravity had been reduced from 89% to 50% after using PDEODE*E-based CCM in learning process. It can be concluded that the utilizing of PDEODE*E-based CCM is able to reduce students misconception on gravity conceptions. Topic: Physics Education 141 OPTIMIZING STUDENTS CONCEPTUAL UNDERSTANDING ON ELECTRICITY AND MAGNETISM THROUGH COGNITIVE CONFLICT-BASED MULTIMODE TEACHING (CC-BMT)Achmad Samsudin1, Andi Suhandi1, Ida Kaniawati1, Dadi Rusdiana1, Aldi Zulfikar1, Muhamad Himni Muhaemin1, Neni Hermita2, Firmanul Catur Wibowo3 1Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung, Indonesia 2Program Studi PGSD, Universitas Riau, Pekan Baru, Indonesia 3Jurusan Pendidikan Fisika, Universitas Sultan Ageng Tirtayasa, Serang, Banten Abstract Conceptual change is one of the international issues that had been studied by many researchers since three decades ago. Students conceptual understanding could be optimized through the learning process in classroom. Nevertheless, students still have misconceptions that noticed the students conceptual change is still not successfully yet. In order to solve the problem, this study was conducted through mix methods research for 40 educational-university students that aimed to optimize students conceptual understanding using cognitive conflict-based multi-mode teaching (CC-BMT) in learning process oriented conceptual change that concluded with: PDEODE*E worksheet design, simulation and natural phenomenon-based media, and Conceptual Change Text (CCT). The analyzing of quantitative data which is analyzed by using normalized gain (N-gain) based on the score as the result of FCCI diagnostic test is 0.77. The analyzing of qualitative data which is utilized a codding analysis reports that the students misconceptions (M) 5%; sound understanding (SU) 57%; partial understanding (PU) 35%; no understanding (NU) 3% after implementing the CC-BMT learning strategy. It can be concluded that the implementing of CC-BMT is able to optimize students understanding on electricity and magnetism. Topic: Physics Education 142 A Development of Science Writing Heuristic-based Worksheets to Improve Students Cognitive on Temperature and HeatMuhamad Himni Muhaemin1, Aldi Zulfikar1, Neni Hermita2, Parlindungan Sinaga1, Muslim1, Achmad Samsudin1 1Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia 2 Program Studi PGSD, Universitas Riau, Pekanbaru, Indonesia Abstract Approachment is one of the important things to support physics learning process in the classroom, mainly on temperature and heat subject. Therefore, the researcher implemented Science Writing Heuristic (SWH) approach simulation in the learning process that had been shown in Lesson Plan within students worksheets. Science Writing Heuristic approach has been used to improve students cognitive in the learning process that measured through observation sheets. This research conducted on tenth-grade students on the senior high school whose had not get yet the temperature and heat subject. The instrument test utilized 26 cognitive questions (multiple choice) that had been judged by the experts. The result of this research shows the significant students cognitive improvement amount 65% passed on pretest and posttest score after they had SWH approach treatment. It could be concluded that SWH approach simulation have a high potency to improve students cognitive. Topic: Physics Education 143 Unpacking Pre-service Physics TeachersUnderstanding of the P-V-T Diagram and The Associated MathematicsDuden Saepuzaman1*) , Syakti P. Sriyansyah 2), Saeful Karim 1) 1Physics Education Department , Universitas Pendidikan Indonesia , Jl. Dr. Setiabudhi No. 229, Bandung 40154 2Physics Education Department , Postgraduate Schools , Universitas Pendidikan Indonesia , Jl. Dr. Setiabudhi No. 229, Bandung 40154 Abstract The P-V-T diagram as macroscopics variable is a mean to understand well the interpretation of the state of a gas in closed system. In this paper, we focuses on pre-service physics teachers understanding of the P-V-T diagram and the associated mathematics linked to its state-function concepts. Data were collected from instrument tes . The instrument tests used to assess understanding was the ability to apply appropriate concepts about state function and its graphical and mathematical representation, including to draw, translete and interprete the P-V-T for thermodynamic processes (isobaric, isothermic, isochoric , adiabatic ) and termodynamic cycle (Carnot, Otto, and Diessel cycles) . The number of participant is 44 students taking Thermodynamics courses. The results showed that 79.6% of the students were able to make PV diagram for isobaric, isothermic, isochoric and adiabatic processes. In the other hand, achievment for PT and VT diangram for isobaric, isothermic, isokermic and adiabatic process respectively 44,1%; 47.9%; 48.2%; And 20.0%. As for the cycles tested include the making of carnot cycle, otto, and diessel. Results showed 56.3% of the students were able to create PV, PT, and PT charts for the Carnot cycle, while for the Otto and Diessel cycles the achievement was less than 50%. This data suggests that there should be an effort to improve the ability of prospective teachers in understanding PVP diagrams for both process and thermodynamic cycles. Topic: Physics Education 144 Implementation of HOT Lab to Improve StudentsS.A Lisdiani (a*) , A Setiawan (b) , A Suhandi (c) a) Physics Education Study Program, School of Postgraduate, *sashrilisdiani[at]gmail.com b) Mechanical Engineering Education Department, Faculty of Engineering and Vocational Education, c) Physics Education Department, Faculty of Science and Mathematics Education Universitas Pendidikan Indonesia, Jl. Dr Setiabudhi No. 229, Bandung 40154, Indonesia Abstract Students? mastery in critical thinking as part of 21st century skills is important to be achieved in preparing students to compete in real life challenge. However, based on previous studies, it is indicated that physics learning activities as part of educational process has not been successfully achieved the goal. Under those need, a quasi experiment study with pretest post test control group design was conducted to investigate how is implementation of Higher Order Thinking (HOT) Lab design in improving students? critical thinking skills. The result shown that there was significant improvement of students? critical and creative thinking skills in experimental group compared to those in control group. Topic: Physics Education 145 THE APPLICATION OF ABDUCTIVE INQUIRY MODELTO IMPROVE STUDENTS CRITICAL THINKING SKILLS.F Hartini and T.R Ramalis Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No.229 Bandung 40154, Jawa Barat, Indonesia Abstract The objective of this study is to understand the improvement of students thinking skills after the application of abductive inquiry learning model. Study was motivated by students low level of critical thinking skills according to results showed by previous study conducted at the same school. This study employed quasi experiment method. Foe research design, this study employed one group pretest-posttest. Sample of this research were the eleventh grade students in a high school in bandung selected through the purposive sampling technique. Data collection was done using test of critical thinking skills. Trial data was analyzed using the product moment. Aspect of critical thinking measured were inferences, evaluation, analysis, interpretation, and explanatory. Meanwhile, mastery concept consisting denotes a normalized gain value. The normalized gain value of the overall critical thinking skills is 0,59, including into medium category. Accordingly, this study concluded that the application of an abductive inquiry model can positively improve critical thinking skills on the senior high school students. Topic: Physics Education 146 Enhancing Students Critical Thinking Skills through Multimedia Based Integrated Instruction (MBI2) on Solar System ConceptSatria Seto Bhakti (a*), Parsaoran Siahaan (a), Didi Teguh Chandra (a), Endi Suhendi (a), Ida Kaniawati (a), Achmad Samsudin (a) a) Universitas Pendidikan Indonesia Abstract The solar system is one of the intangible learning materials of science because the phenomena that occur could not be presented directly in the classroom such as members of the solar system, the repetition of day and night, the phases of moon, and the eclipse. This resulted is student difficulties to understanding the solar system concept. To overcome these problems, the researcher aims to develop learning media that can also enhance the Critical Thinking Skills (CTS) of students through Multimedia Based Integrated Instruction (MBI2). MBI2 is an integrated multimedia computer which contains learning materials including video, animation and simulation, learning tools, e-books and assessment. To collect and to analyze the data genuinely and comprehensively, researchers utilized a developing method of 4D which has comprehensive steps the use of define, design, development, and disseminate. The results of research showed that (1) 78% of students were able to identifying/formulating the criteria of possible answers, (2) 78% of students could identifying premises, (3) 84% of students could explaining the hypothesis, (4) 78% students could identifying assumptions or conclusions, (5) 84% of students could choose the possible criteria as a solution to the problems. Based on data analysis, it can be concluded that MBI2 could significantly enhance the critical thinking skills of junior high school students on solar system. Topic: Physics Education 147 Diagnosing High School Students Conceptions on Dynamics-FluidFitri Nurul Sholihat, Muhamad Gina Nugraha, Achmad Samsudin Universitas Pendidikan Indonesia, Departemen Pendidikan Fisika, Bandung, Indonesia Abstract Student conceptions on dynamic-fluid topic have been diagnosed using diagnostic test item. The main cause of student misconceptions on the concept of physics derived from student itself. This cause of misconception can be grouped into 8 factors, i.e. preconception, associative thinking, humanistic thinking, incomplete reasoning, wrong intuition, stage of cognitive development, ability and interest in learning. The purpose of this study is to diagnose the student?s conception on dynamic fluid topic. This study used 4-D model method consisting of 4 stages, namely defining, designing, developing and disseminating. A total of 29 high school students in Bandung became a sample. The data were analyzed from 10 multiple choice questions accompanied by open-ended reason (two tier tests) on the dynamic fluid topic. The results show that students have a tendency to have misconceptions of dynamics-fluid topic. Therefore, it can be concluded that diagnostic test items is able to analyze student misconceptions. Topic: Physics Education 148 The Effects of Higher Order Thinking (HOT) Laboratory Design in Elasticity on Students Creative Thinking SkillsD Safitri (1*), A Setiawan (2) , and A Suhandi (3) 1 Physics Education Program, Shool of Postgraduate, 2 Departement of Machine Education, Faculty of Engineering and Vocational Education, 3 Departement of Physics Education, Faculty of Science and Mathematics Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudi No 229, Bandung 40154, Indonesia Abstract This research is based on a lack of creative thinking skills of students. Creative thinking as one of higher order thinking skills is urgently required by everyone to face real world problems in the 21st century. Therefore, an innovative learning method is needed to train this skill. This study aims to investigate the effect of implementation of HOT laboratory design in the topic of elasticity on the creative thinking skills of senior high school students in Sukabumi city West Java. It was a quasi-experimental study with non-randomized sampling technique and pretest-posttest control group design. The control group consisted of 28 students was given verification laboratory while the experimental group consisted of 25 students was given HOT laboratory. Data were collected by using creative thinking skills test and observation sheet which has been validated by expert. The findings showed that students who get HOT laboratory significantly have better creative thinking skills than students who get verification laboratory. It can be concluded that HOT laboratory design effectively has improved student creative thinking skills Topic: Physics Education 149 ICARE model uses multi-mode representation to provide scientific communication skills of madrasah aliyah studentsE N Aziza (1*.3) and W Liliawati (2) 1) Physics Education Postgraduate School, Indonesia University of Education, Bandung, West Java, Indonesia *elviananooraziza[at]gmail.com 2) Physics Education Department, Indonesia University of Education, Bandung, West Java, Indonesia 3) Madrasah Aliyah Negeri Purwakarta, Purwakarta, West Java, Indonesia Abstract This study aims to investigate the effect of ICARE model that use multi-mode representation of students scientific communication skills. The research method used was quasi experimental method with randomized pretest-posttest control group design. The population were all of students in XI grade in one of the Madrasah Aliyah (Islamic senior high school) in Indonesia. The control class consists of 30 students only given the ICARE model and the experimental class consisted of 30 students who were given the ICARE model by using multi-mode representation. Data collection using scientific communication skills tests on elasticity topics and observation sheets of scientific communication skills. The results showed that students who get learning model of ICARE using multi mode representation of their scientific communication skills is higher than students who get learning model of ICARE without using multi-mode representation. Therefore, the ICARE model using multi-mode representation is an effective model for providing students scientific communication skills. Topic: Physics Education 150 Excavating the Quality of Vocational Students` Mental Models and Prediction on Heat ConductionIka Mustika Sari, Dessy Fauzi, Duden Saepuzaman, Dadi Rusdiana Department of Physics Education, Universitas Pendidikan Indonesia Abstract This study aimed to depict of vocational students mental models and the relationship of mental models with predictive on heat conduction. Participants in this study are 20 vocational students in eleventh grade. The descriptive method was used in this study. The data were taken using a semi-structured interview with the interview protocol was adopted and adapted from Chiou and Anderson (2010). The data gathered was analysed by using constant comparison method. The results showed that there were 11 mental models emerged in heat conduction (Interaction, Friction, Gear-like interaction, Substance, Heat as Substance, Energy, Medium, Position, Absorption based Conduction, Numbers of particles and Sample Based Conduction). More than 90% of students have unscientific mental models. Moreover there is a complex relationship between mental model with prediction as it showed by Chiou. Investigating the students mental models on heat conduction of vocational students have a wide implication in improving the Physics learning in Vocational School. Topic: Physics Education 151 Promoting Conceptual Change in Pre-service Elementary School Teachers Understanding on Interactions of Neutral and Charged Objects Concept by Using MMVSCCTextNeni Hermita1,2, Andi Suhandi2,4, Ernawulan Syaodih2,3, Achmad Samsudin4, Aldi Zulfikar4,Muhamad Himni Muhaemin4,Isjoni5 and Fitria Rosa6 1Universitas Riau, Program Studi PGSD FKIP, Pekanbaru 28293, Indonesia 2Program Studi Pendidikan Dasar, Universitas Pendidikan Indonesia, Bandung 40154, Indonesia 3Program Studi PGPAUD, Universitas Pendidikan Indonesia, Bandung 40154, Indonesia 4Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung 40154, Indonesia 5Program Studi Pendidikan Sejarah, Universitas Riau, Pekanbaru 28293, Indonesia 6SMAN 1 Peranap, Indragiri Hulu 29354, Indonesia Abstract The aim of this research was to construct and test Multi Media Visual Supported Conceptual Change Text (MMVSCCText) for promoting pre-service elementary school teachers conceptual change about the interactions of neutral and charged object concept. The mixed-method was using as a research method. The study is based on 27 PGSD Program students at FKIP Universitas Riau Indonesia. Students conception and confidence levels of conception are identified in the first steps of and after MMVSCCText activity. MMVSCCText was designed based on students misconceptionsby following six-phase Conceptual Change Model (CCM) synthesized by Stephans. Conceptual change in students understanding of neutral-charged object interactionwas evaluated by comparing the initial conceptions of students identified in first steps with the final conception of students identified in fourth steps, while delayed posttest used to see the consistency of a new conception that students accommodate. Students conception data were collected by using students worksheet and conception test in the four tier test format. The results of analyses suggest that MMVSCCText activities promoted students conceptual change from misconception to scientific conception condition. Students who initially hold misconception changed to the scientific conception after following MMVSCCText activity about 84.2%. Most of students (about 73.7%) still hold a scientific conception on delayed post-test, suggesting that MMVSCCText activity enabled students to retain their new conceptions in the long-term memory. Topic: Physics Education 152 Enhancing Junior High School Students Conceptual Understanding using The POE-based Demonstration Technique on Static ElectricityMuhammad Guntur Purwanto1*, Asep Sutiadi1, Neni Hermita2, Achmad Samsudin1 1Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung, Indonesia 2 Program Studi PGSD, Universitas Riau, Pekanbaru, Indonesia Abstract Predict-Observe-Explain (POE) based Demonstration has been developed to illustrate the static electricity concepts turn into more factual and purposeful learning. The design of POE-based demonstration is a technique of learning that allows students to discover the entire concepts of static electricity in terms of the existing conceptual and practical. To analyze the data genuinely and comprehensively, we have already utilized a developing method of ADDIE which has five-extensive phases: 1) analyzing, 2) designing, 3) developing, 4) implementing and 5) evaluating. The ADDIE developing steps has been used to define comprehensively from the phase of analysis to the evaluation. The data shows that junior high school students have three understanding condition, that are, students who have high understanding is 70%, moderate understanding is 25% and low understanding is 5%. In conclusion, POE-based demonstration could effectively raise the concept mastery of static electricity for junior high school. Topic: Physics Education 153 Promoting Oral-Communication Skill of Seventh Grade Student on Earth Science Content Using Multimedia Based Integrated Instruction (MBI2)Anggi Hanif Setyadin (a*), Parsaoran Siahaan (b), Achmad Samsudin (c), Endi Suhendi (d), Ida Kaniwati (e) Universitas Pendidikan Indonesia Abstract Student have to improve their communication skills whereas they are in school and college to enhance their adaption for the 21-century skills requirement. The aim of this study is promoting students oral-communication skills through Multimedia Based Integrated Instruction (MBI2) on earth-science content. The research method that utilized in this research is embedded mix methods toward 29 seventh grade students that consist of 14 males and 15 females. Oral communication skill rubric based on College of Business Administration (CBA) San Diego University and International Reading Association is used to assess students? oral-communication skill. The aspect that assessed in four meeting are eye contact, intonation of speech, content, enthusiasm, also mannerisms & body language. The result shows that the average score of five aspect oral-communication skills on every meeting are 8.40 (earth structure sub-content) that categorized Fair, 13.75 (earthquake sub-content) that categorized Good, 14.83 (tsunami sub-content) that categorized Good and 15.67 (volcano sub-content) that categorized Good. In conclusion, MBI2 model can promote oral communication skill of seventh grade student on earth science content. Topic: Physics Education 154 CONSTRUCTING ESSAY QUESTIONS TO ASSESS SCIENTIFIC CREATIVE AND CRITICAL THINKING SIMULTANEOUSLY RELATED TO COLLISION PROBLEM BASED ON STUDENTS RESPONSESIyon Suyana1), Sarah Nadaipah1), Parlindungan Sinaga1), Selly Feranie1) 1)Universitas Pendidikan Indonesia Abstract There are a range of instrument diagnostic tests to investigate students scientific creative thinking and critically thinking simultaneously, especially on the subject of collision. However, the majority of the instruments in the form of multiple choice questions which the mathematical construction. Therefore, this study was conducted to develop an instrument diagnostic test to diagnose students scientific creative and critical thinking in the essay questions form. This instrument consists of two items to measure students scientifict creative thinksing ability and three questions to measure students scientific critical thinking skills. This instrument development methods execute refers to the Scientific Structure Creativity Model (SSCM) and the Assessment of Critical Thinking Ability (ACTA) based on homogeneous 36 tenth grade high school students responses by open-ended question form. The instruments scientific creative thinking and critically thinking test have been weathered into 12 tenth grade high school students as the participants were the results analyzed by comparing with the construction of the model answers. The results of this study showed that there are a significant development in scientific creativity and critical on student responses It can be concluded that this constructed instrument can be used to measure creative thinking and critically thinking students simultaneously. Topic: Physics Education 155 ANALYZING STUDENT RESPONSES TO CONSTRUCT OPEN ENDED QUESTION TO ASSESS SCIENTIFIC CREATIVE AND CRITICAL THINKING (SCCT-TEST) RELATED TO HYDROSTATIC PRESSUREHeni Rusnayati1),Nur Oktavianti1),Hera Novia1),Duden Saepuzaman1),Selly Feranie1) 1)Universitas Pendidikan Indonesia Abstract Information about students scientific creative thinking and scientific critical thinking skills is one of the important factorin order to ancillary students learning achievement in the subjects of physics, including hydrostatic pressure. Therefore, this study was conducted to identify students scientific creative thinking and scientific critical thinking skills profile through developing a diagnostic instrument test named Scientific Creative and Critical Thinking (SCCT) test in the open-ended questions form. The instrument test SCCT consist of 2 question items about scientific creative thinking and 3 question items about scientific critical thinking that had been developed based on Scientific Structure Creativity Model (SSCM) and Assessment of Critical Thinking Ability (ACTA) simultaneously. The instrument test SCCT had been reconstructed based on every 10 eleventh grade students responses and model answers with three stages to obtain the students profile scientific creative thinking and scientific critical thinking skills, so that participants were 30 students. The findings of this study showed the students scientific creative thinking and scientific critical thinking skills profile related to the hydrostatic pressure subject. It can be concluded that the SCCT test as the diagnostic test instruments has the possibly utilized to get students scientific creative thinking and scientific critical thinking skills profile. Topic: Physics Education 156 Implementation of ASSET (Assessment Simulation Test) With CRI for Reconstruction Concept of OpticFirmanul Catur Wibowo1, M. Noor Faizin3, Dina Rahmi Darman1, Achmad Samsudin2, Andi Suhandi2, Ubed Alizkan1, Vokal Ilma Fadhlandini1, Supriyatman4, Andri Suherman1, Aceng Hasani1, Suherman1, Sholeh Hidayat1 1Universitas Sultan Ageng Tirtayasa, Serang, Indonesia 2Universitas Pendidikan Indonesia, Bandung, Indonesia 3Sekolah Menengah Pertama Negeri 2 Kudus, Indonesia 4Universitas Tadulako, Palu, Indonesia Abstract This study aims to examine the effect of "ASSET" (Assessment Simulation Test) with CRI (Certainty of Response Index) to the reconstruction of conception on Optic at senior high school in Serang City. The study focused on the test results on the quantity of reconstruction of students conceptions on the use of "ASSET" items. The research method used in this research is the Quasi-Experiment pretest-posttest control group. The subjects of this study involved two groups: the control group and experimental group using "ASSET". Data were collected through a misconception test which was inserted in the CRI index column on the student answer sheet conducted after the learning. Concept reconstruction data to be obtained from both groups is searched for and treated using nonparametric hypotheses data relating to the quantity of misconceptions, processed based on CRI score achievement for both groups. The results showed that in the experimental group the application of physics learning using "ASSET" assisted CRI is effective in the reconstruction of the conception of the optic. Topic: Physics Education 157 Engaging Students in STEM Based Learning Through Media and TechnologyIrma Rahma Suwarma, Ida Kaniawati, Dewi K Universitas Pendidikan Indonesia Abstract Engaging students in physics learning are a challenge for teachers, since few students who are interested in it. Therefore, STEM based learning that embedded scientific and engineering practice, was chosen to solve the problem. It has been developing in Indonesia since 2013 at secondary school level. The implementation evaluation showed that most of STEM based learning was created through media and technology. These studies were analyzed students response toward STEM based learning through a media and technology. The media and technology was invited into electricity learning. 92 students were involved as samples of this study that cane from two different classes. The analysis result showed that most of student enjoyed the lesson and eager to engage in other STEM based learning. Moreover, they agree that media and technology can help them in understanding the concept. It convinced by the students understanding improvement after the learning processes Topic: Physics Education 158 Identifying Pre-Service Physics Teacher Mental Model on Electric ConceptionsSupriyatman(a*), Andi Suhandi (b), dan Dadi Rusdiana (b), Achmad Samsudin (b), Firmanul C. Wibowo (c) a) Program Studi Pendidikan Fisika, Universitas Tadulako, Palu, Indonesia. * spymfis.untad[at]gmail.com b) Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung, Indonesia. c) Departemen Pendidikan Fisika, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia Abstract A study was conducted on mental model on electricity (MMoE) of pre-service physics teachers. This study aims to identify the MMoE of pre-service physics teachers who have followed the basic physics 2 subject, electricity concept. Researchers employs the phenomenological method to describe the MMoE profile of pre-service physics teachers. The data are collected using a problem solving-based test instrument. Instruments used are a problem solving test modified with five electrical questions given to 49 pre-service physics teachers. The results showed that the respondents MMoE at level 1 is 50.2%, at level 2 is 16.7%, at level 3 is as much as 3.3% and 29.8% is not accessible. This profile suggests that in analyzing the problems, pre-service physics teachers answer the questions based on intuition and daily experience without using the appropriate concept. Pre-service physics teacher are not capable of analyzing, accessing, constructing element of the knowledge gained during the lectures and coherently represents the answer to solve the problems. Based on the analysis of data and research results, it can be concluded that the learning that has been applied do not help pre-service physics teachers organizing their knowledges in solving problems. Topic: Physics Education 159 Developing Science Teaching Materials on The Topic of StarsNadia Nur Imania, Dadi Rusdiana, Momo Rosbiono Student of Postgraduate School Programe Indonesia University of Education Abstract Space science is one of the teaching subject that included in Junior High School curriculum. Equipped with facilities that support, space science will be more interesting to learn. Textbooks are one of the teaching materials used to facilitate students in studying the science of space. Therefore, textbooks or material texts that are prepared in a complete, systematic, and in accordance with the cognitive and mental development of students is needed. One of the teaching materials development techniques that can be used is 4 Steps Teaching Material Development (4S TMD). This technique has four stages, namely selection, structuring, characterization, and didactic reduction. This study has objectives to develop the star-themed subject matter and to check its readability by students. The result for selection stage is learning objectives, and value related content, after validated by expert, can be used for the next stage. At the second stage, concept map was made to complete the developed teaching material. Developed teaching material can be used easily by student, after checked by quisioner. Topic: Physics Education 160 Developing Assessment Tools: Physics Virtual Assessment (PVA) with Four Tier Test (FTT) of Light ConceptDina Rahmi Darman, Imas Eva Wijayanti, Ubed Alizkan, Murti Ayu Wijayanti, Abdul Fatah, Firmanul Catur Wibowo. Universitas Sultan Ageng Tirtayasa Abstract This study aims to develop and apply Physics Virtual Assessment (PVA) with four tier test (FTT) the concept of Light. During this assessment done with paper and pencil so less meets the inventiveness of the 21st century. Data to draw conclusions from the research results, collected through the concept test using FTT with PVA of Assesment tool. The method of this study used quasi-experimental research method with the research design Randomized posttest-only control group. The subject of this research involves two groups namely the control group in the form of paper and pencil test and PVA of the experimental group. FTT data to be obtained from both groups are searched for the average conceptual change which is polarized and processed by using Nonparametric Hypothesis Test (Wilcoxon Test). Specific targets to be achieved in this research are innovations in developing assessment tools that are valid and easy to use and can be done with Virtual so that asset can be done anytime and not limited by time. The results showed that using PVA with FTT as an effective saman assessment tool because it is easy to use and can be installed in handphone. Topic: Physics Education 161 Development of Integrated Science Teaching Material with Webbed Model on Global Warming Theme for Junior High School Student of Class VIIYuliana Sari (a*), Harry Firman (b) a) Faculty of Mathematics and Science Education, Indonesia University of Education, Jalan Setiabudhi 229, Bandung 40154, Indonesia * yulianasari.mpd[at]gmail.com b) Faculty of Mathematics and Science Education, Indonesia University of Education, Jalan Setiabudhi 229, Bandung 40154, Indonesia Abstract This study was a qualitative study that aims to create the development of Integrated Science teaching material with an appropriate webbed model for junior high school students of class VII in SMP 29 Bandung. Teacher creativity is highly expected in developing some innovative, varied, interesting, contextual, and appropriate teaching materials with the needs level of learners. This is consistent with the demands of competencies that must be have by teachers (pedagogic, personality, social and professional competence). The theme of the teaching materials used is Global Warming, developed with Four Steps Teaching Material Development (4S TMD) are including: selection, structuring, characterization and didactic reduction, as the main guidance in the development of this resource. Research subjects were students (13 years old) in two class VII SMP 29 Bandung, which selected by purposive sampling technique. The results show this feasibility of teaching materials in very feasible category for all aspects, namely the content and integrity feasibility aspect, presentation aspect, linguistic aspect, and graphic aspect. There are improvement conceptual mastery of Global Warming issues as reflected in the results of concept mapping by students are getting better at each class meeting. The students also provide positive perceptions of teaching materials, either through questionnaires or interviews. Topic: Physics Education 162 The Development of HOT Lab Construction About Heat TransferAdam Malik1,2a), Agus Setiawan3, Andi Suhandi4, Anna Permanasari5, Achmad Samsudin4, Yudi Dirgantara2, Herni Yuniarti2 1 Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 2 Program Studi Pendidikan Fisika, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. A.H. Nasution No. 105 Cibiru, Bandung 40614, Indonesia 3 Departemen Pendidikan Teknik Mesin, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 4 Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 5 Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract The HOT Lab has been developed to enhance pre-service physics teachers? transferable skills, namely; critical thinking skills. This research aims to develop HOT Lab regarding the transferable skills in the context of determining pre-service physics teachers? critical thinking skills about heat transfer. For collecting and analyzing the data comprehensively, we have ever implemented a development of ADDIE model that have comprehensive steps: analyzing, designing, developing, implementing, and evaluating. The ADDIE model has been already utilized to develop comprehensively from the phase of analysis program up until the evaluation program. Furthermore, the HOT Lab characteristics contain context-rich issues and should be overcome through 1) doing a practicum, 2) applying the physics concepts, 3) containing the limitations through problem-solving and 4) demanding creative and critical thinking in solving problems. Moreover, it has alternative choices of non-trivial answers and troubleshooting results which are should be presented. The HOT Lab is able to develop the pre-service physics teaches critical thinking skills of with N-gain 0.69. It can be concluded that HOT Lab design has been tested and it could effectively improve the pre-service physics teachers? critical thinking about heat transfer at Prodi Pendidikan Fisika, UIN Sunan Gunung Djati Bandung. Topic: Physics Education 163 Authentic Assessment Model on Renewable Energy Literacy of Environmental Physics Based on Teaching and Learning TrajectoryChaerul Rochman and Dindin Nasrudin UIN Sunan Gunung Djati Bandung Abstract This study aims to describe the models of Authentic Assessment Based on Teaching Learning Trajectory (AABTLT) on renewable energy literacy of environmental physics courses. The method used in this study is sequential exploratory mixed methods. Samples are students who have attended the subject of renewable energy literacy of environmental physics courses as many as 26 people. The instrument used are lecture planning documents and Student Activity Sheet (SAS) which is processed in quantitative and qualitative way. The conclusions of this study are (1 ) lecturer teaching trajectory can be followed by students learning trajectory through Student Activity Sheet (SAS); (2) there are variations of consistency and qualification of learning materials listed in SAS; (3) students answer to SAS can be an assessment materials of process quality and renewable energy literacy of environmental physics courses, and (4) model of AABTLT can improve the concentration and deepness learning material of learners. Topic: Physics Education 164 IMPLEMENTATION SCIENCE PROCESS SKILL APPROACH TO IDENTIFY DEVELOPMENT OF STUDENTS SCIENCE PROCESS SKILLS ON SIMPLE MACHINE MATERIALHilda Foricma, Setiya Utari, and Endi Suhendi Indonesia University of Education Abstract Science Process Skill (SPS) is an important skill for scientists to learn science scientifically because it become the base of recent topics in science education which leads to scientific literacy (LS) and skills of the 21st century. Without SPS, LS competencies and skills of the 21st century are difficult to be trained. However, it has not been trained optimally on the science learning process at school, so the ways to practice SPS in secondary education must be found. Pre-experiment research was done with the design of one group pretest-posttest and using a population of eighth grades students, who were taught by a same teacher in one of the Junior High Schools in Bandung Regency and a sampling of 35 students which was obtained by random to get an overview of the development of students SPS on simple machine material through learning which use Science Process Skills Approach. Development of students SPS is obtained based on the portfolio assessment by use of students worksheet rubric. Results of the study showed that the students SPS can grow from poor to good category. The aspects of SPS that be developed were identify variables, formulating hypotheses, designing experiments, collecting data, and interpreting data. However, the aspect of SPS that had not yet developed was making prediction and making the graphs so the way to practice this aspect of SPS is still needs development. Topic: Physics Education 165 PREDICT, PLAN, OBSERVE, EXPLAIN AND WRITE (PPOEW): A STRATEGY TO PREVENT STUDENTS? MISCONCEPTIONS ON WORK AND ENERGY TOPICSDedah Siti Jubaedah, Nuzulira Janeusse Fratiwi, Ida Kaniawati, Iyon Suyana, Achmad Samsudin and Endi Suhendi Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia Abstract This research based on students? misconceptions on work and energy topics. Students? misconceptions could be prevented through Predict, Plan, Observe, Explain and Write (PPOEW) strategy on their learning. This research methodology was conducted in a quasi-experimental design with one group of pre-test and post-test for 18 students consist of 13 girls and 5 boys as research subjects. The four-tier test used as an instrument to identified student?s misconception on Work and Energy topics that has been developed in previous research. The data analysis focused on how effective was the PPOEW with computer simulation to reduce students? misconception in the concept of positive energy, negative energy, conservative and nonconservative energy, work-kinetic energy theorem, and energy conservation law. According to the result of the research, PPOEW reduces students? misconception from 52,22% to 14,44%. In addition, PPOEW also increased student?s concept shown by an N-gain value that about 0,5 (medium). Topic: Physics Education 166 Simulated Analysis of Image Formation for Concave Mirror with Scilab by Using The Concept of CalculusErwin Randjawali (a*) and Robi D. Riupassa (b) a) Universitas Kristen Wira Wacana Sumba Jalan R. Suprapto No. 35, Waingapu 87113, Indonesia erwinrandjawali[at]gmail.com b) Sekolah Tinggi Teknologi Bandung Jalan Soekarno Hatta No. 378, Bandung 40235, Indonesia Abstract The location and height of an image produced by the reflection of an object on a concave mirror can be obtained by analytic, and also by geometry. However, if the formation of the image is drawn on a regular blackboard, it will give inaccurate results. Therefore we need a media which can provide an accurate results. One of the media that can be used is computer. The utilization of computer as a medium of learning has been proven can attract interest and motivation of student to study physics. One way to use it as medium is by creating a simulation which is related to the topic being taught. The simulation is made by using the physics concepts about optical geometry in concave mirror, computation of science, and the equations of lines on calculus. The application which are used in this simulation is Scilab 6.0.0 and simplescreenrecorder 0.3.8. In this simulation, two models are designed to create the image of concave mirror reflection. In the first model, the tip of the special rays is described precisely about the curvature of the concave mirror, while in the second model, the end of the rays are drawn up to the line $$s=0$$. In addition to produce a learning media, this simulation also aims to compare which model gives the same result as the result obtained analytically. Result of the simulation shows that the first model has a considerable difference when compared with analytic result. By using $$R=20cm$$, $$s=25cm$$, dan $$h=5cm$$. We get error calculation of $$s^{\prime}$$ about $$3,533\%$$ and $$h^{\prime}$$ about $$2,650\%$$. The error of $$s^{\prime}$$ and $$h^{\prime}$$ in the first model quite vary according to the value of $$s$$ and $$h$$ which are used. However, the second model gives the same result as the analytic calculation. So, the second model is better to illustrate the image formation of the concave mirror. This simulation also proves that it is easier to describe the formation of an image on the concave mirror when the mirror is considered as a straight line. Topic: Physics Education 167 Preliminary Development of Varied Circular Wires on Identifying Magnetic Field through Magnetometer SoftwareRien Ainur Rahmi, Lutfyana Yusuf Pratama, Mariny Rilen Simamora, Achmad Samsudin Laboratory of Basic Physics, Department of Physics Education, Faculty of Mathematics and Natural Sciences Education, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No. 229, Bandung, Indonesia Abstract The magnetic field on circular wire used to be experimented utilizing a condition, namely, to condition the wire in the form of a full circle geometry only. The measurements were performed stare at one position, which is at the center of a circular wire. This experiment was conducted in order to vary some conditions in terms of geometric shapes, diameters, current flows, the type of wire used and the position of the sensor in the smartphone through a magnetometer to measure the magnetic field in the area. The research methodology used is the development of 4-D (Define, Design, Develop and Disseminate). The observation and analysis of the data that has been taken by the researchers showed that the correlation between the variables used by a magnetic field is generated. A magnetic field generated when the various diameter of the circle is 99 microtesla for the smallest circle diameter and 57 microtesla for the diameter of the largest circle. A magnetic field generated when a modified geometry of the wire is 68 microtesla for full circle geometry, 35 microtesla for geometry 3/4 circle, 34 microtesla for the geometry of a 1/2 circle and 34 microtesla for 1/4 circle geometry. Similarly for distance variations, currents and varied types of wire, obtained magnetic field varies. Furthermore, the use of software was more accurate by using magnetometers in experiments about 1,28% - 1,75% which is compared to manual calculation. Subsequent to the experiments were conducted, it was concluded that the magnetic field was able to be affected by several factors, among others, from the geometric shape, diameter, current flows, the type of wire and the position of the sensor in smartphones. Topic: Physics Education 168 Diagnosis of Students Misconceptions on Momentum and Impulse Trough Inkuiry Learning with Computer Simulation (ILCS)Shita Ayu Amalia, Nuzulira Janeusse Fratiwi, Achmad Samsudin, Ida Kaniawati, Endi Suhendi* Departemen Pendidikan Fisika FPMIPA UPI, Jalan Setiabudi No 299, Bandung 40154 *endis[at]upi.edu Abstract Misconceptions often happen to the concept of momentum and impulse. A learning model that is considered appropriate to overcome misconceptions is the inquiry learning model. Computer simulation is using in this research for help inquiry learning model. The purpose of this research is to know the profile of student misconception after applying inquiry learning. This research uses descriptive analytics. The study was conducted on 28 high school students (12 boys and 16 girls) of class X in Bandung. Misconceptions are detected using the Momentum and Impulse Four-Tier Test (MIFT) instrument. Based on the results of the study, it is found that there are still 15.56% of students experiencing misconceptions on the material momentum and impulse. Topic: Physics Education 169 Realization of Null-type Bridge instrument to determine water level to anticipate flood using Enquiry-Based LearningMohamad Reza Nurrahman (1), Andi Gumarilang Cakti (1), Kevin Misrano (1), Elfi Yuliza (1), Khairurrijal Khairurrijal (1,2*) 1) Departmen of Physics, 2) Master Program in Physics Teaching, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40312. *Email: krijal[at]fi.itb.ac.id Abstract Teaching method and quality of teacher is some factors that determine quality of education. One of learning method to increase students understanding is EBL (Enquiry-Based Learning). EBL is one term of active learning method with students as centre of learning and teacher as facilitator to give advice and direction. EBL place students questions, ideas, and observations as the centre of learning. In this method, students worked in a group to learn through a process of enquiry by a stimulus question from teacher. EBL combines cooperative learning, problem solving, and enquiry to discovery a problem. The purpose of this method is to develop a student that can think critically, improve skill in research, analyse, evaluate, and make a conclusion to answer the problem. In this paper, EBL method was used to improve understanding in null-type measurement by Bridge circuit as variable conversion to determine the level of water and its application. In this method, a group is formed that consist three students to enquire that topic. There are six steps that have done: 1. stimulation, a stimulus question from a teacher, 2. problem statement, driving questions to be solved and making hypothesis, 3. data collection, searching information and doing experiments, 4. data processing, analysing the data, 5. verification, making sure student has solve their equations, 5. conclusion, answering the questions and presenting the result of enquiry. Based on this series of steps, it can be shown that d.c. Bridge circuit with LDR (light dependent resistor) as a sensor can be used to measure water level with type-null for anticipating flood. Topic: Physics Education 170 Making Humidity Meter Based on Null-type D.C. Bridge: A Project-Based LearningAzka Zakiyyatuddin(1*), Nona Avena Purba(1), Hadyan Luthfan(1), Elfi Yuliza(1), Khairurrijal(1,2) 1) Department of Physics 2) Master Program in Physics Teaching Faculty Mathematics and Natural Science, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40312, Indonesia E-mail: krijal[at]fi.itb.ac.id Abstract Abstract. Project-based learning (PBL) is a comprehensive perspective focused on investigation. The basis of PBL lies in the authenticity or real-life application of the research. Basically, PBL promotes the idea of ?learning by doing.? Within this method, the solutions of problems are acquired by asking and refining questions, debating idea to answer the question, making predictions, designing plans and experiments, collecting and analyzing data, and finally draw the conclusions. Using these steps, we can easily understand how to solve the problems through a project. In this paper, we report a project about humidity meter based on null-type D.C. bridge circuit that has been made by a group of three students. The students? group was assisted by a lecturer and a tutor. Due to this project, we learned more materials than we thought we would. We learned about teamwork, critical thinking, problem-solving, and soldering. Topic: Physics Education 171 Digital Intensity Meter Based on Deflection-type D.C. Bridge Realized Using Project Based Learning ApproachMuhammad Iqbal Rahmadhan Putra (a), Muhammad Reza Ramadhani Raharja (a), Enggar Lokshewara Renanda (a), Elfi Yuliza (a), and Khairurrijal Khairurrijal (a,b*) (a) Department of Physics, (b) Master Program in Physics Teaching, *E-mail: krijal[at]fi.itb.ac.id Faculty of Mathematics and Natural Science, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40312, Indonesia Abstract Project based learning (PjBL) is a learning method that focuses on problem-solving through specific projects to create an understanding of what relationships are learned in the classroom and real-life. In other words, PjBL is learning by doing. There are five steps in PjBL method; 1) Find the driving questions, 2) Explore the driving questions to learn and apply important ideas, 3) Collaborate actively with the lecturer, the tutor, and other students to investigate questions and ideas, 4) Use technology to help the understanding process, 5) Create a real product that leads to driving questions and publish it. In this paper, PjBL method was used for making a simple intensity meter based on deflection-type D.C. bridge circuit. This project was completed by a collaboration of a group of three students with a lecturer and a tutor as a facilitator. With the series of steps in this method, students got a better way to learn and to understand the course and also to be able to make a simple instrument for measure the light intensity. In this project, a light dependent resistor (LDR) was utilized to convert light intensity to the resistance of the bridge circuit. In order to make the values of intensity is straightforward to be read, Arduino Uno was employed to convert the analog data to digital and to display the result on LCD. Topic: Physics Education 172 Challenge-based Learning Model with Reading Infusion Strategy in Physics instruction : Study of LiteratureRirin Utami, Ida Kaniawati, Irma Rahma Suwarma Universitas Pendidikan Indonesia Abstract Abstract This study aims to develop the cognitive skill and problem-solving skill in Junior High School based on curriculum 2013. This paper discusses how the Challenge-based learning model with reading infusion strategy applied in the physics instruction. A model and strategy in learning that improve the cognitive skill, and problem-solving skill. The result of this research is very possible for teachers to insert challenge-based learning model with reading infusion in class instruction to improve cognitive skill and problem-solving skill. A study of literature is used in this study as a preliminary study. On other occasion, a research can be done to prove the effectiveness of using challenge-based learning model with reading infusion strategy in physics learning. Topic: Physics Education 173 Shifting from Physics Teacher to Basic-Science Teacher: Adequate or Not? (a self-study)Regina Lichteria Panjaitan Universitas Pendidikan Indonesia Abstract For years, basic concepts of physics were taught in Universitas Pendidikan Indonesia as a subject in primary-school teacher candidate program. Nonetheless, since 2015/2016 school year that course was removed from the program curriculum and basic-science enrichment is a new subject instead. Basic-science enrichment subject contains basic physics, basic chemistry and basic biology and all of them are simply in one course. Meanwhile, the author who has physics educational background and usually taught basic concept of physics should teach basic science including basic chemistry and biology. This paper is a result of a self-study research as self-reflection on teaching that elaborates the advantages and drawbacks of being a teacher with physics educational background, but eventually should immerse herself in a basic science (not-only physics) teaching and learning environment. Some questionnaire results from the students about the impressions they got from the teacher related to this case were also discussed. Topic: Physics Education 174 Making Counter Clockwise Analog Thermometer Under Project-Based Learning MethodNatasha Flaminggo1, Rafi Candra1, Anisa Natalia1, Elfi Yuliza1, Khairurrijal Khairurrijal1,2,a) 1Department of Physics, 2Master Program in Physics Teaching, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jalan Ganesa 10, Bandung 40132, Indonesia Abstract The basis of this project was to explore a different kind of thermometer using a semiconductor material with an analog counter clockwise reading. The semiconductor material we used was a negative temperature coefficient (NTC) thermistor, and it was implemented in a deflection-type D.C bridge circuit. To complete this project, we followed some series of steps from Project-Based Learning (PBL) method. First, we acquired knowledge about D.C bridge circuit types from Measurement and Data Processing Techniques course. Next, we decided about the problem to be solved, that is to create a thermometer using the semiconductor material with deflection-type D.C bridge circuit. Then, we started to collect data from an experiment and made the counter clockwise analog thermometer. Finally, we presented our project to lecturer and tutor to get feedback about our project. Upon completion of the assignment we found that for displaying data measurement from NTC thermistor, the counter clockwise display was the most appropriate. Topic: Physics Education 175 Cosmological inflation with minimal and non-minimal coupling of scalar field from Horndeski theoryGetbogi Hikmawan (1), Agus Suroso (1,2), Freddy P. Zen (1,2) 1. Theoretical Physics Laboratory, THEPI Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia. 2. Indonesia Center for Theoretical and Mathematical Physics(ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia. Abstract We consider a cosmological model with combination of minimal and non-minimal coupling of scalar field by considering a set of particular coefficient function from Horndeski theory. We study cosmological inflation from the background solution and get the responsible coupling constant regarding the slow-roll inflation parameters. Then we compare the result with the stability conditions to get the exact value of coupling constant for this cosmological model. Topic: Theoretical High Energy Physics 176 Low Amplitude Kink Soliton Excitation in Peyrard-Bishop-Dauxois Double Strand DNA ModelDonny Dwiputra(a*), Wahyu Hidayat(a,b), Freddy Permana Zen(a,b) a) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung, 40132, Indonesia b) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia *donny.dwiputra[at]s.itb.ac.id Abstract We investigate the feasibility and appearance of a kink-like soliton solution in Peyrard-Bishop-Dauxois double-strand DNA model by applying the method Zdravković et al [Chaos Soliton Frac. 45, 1378 (2012)]. We extend the method to a perturbative case, resulting in a low amplitude solution. The importance of the kink excitation is to describe the propagating open state of DNA chain which has a significant role in DNA transcription and replication processes. In this paper, we study the feasibility conditions of a kink-like excitation to appear in DNA chain. Topic: Theoretical High Energy Physics 177 Killing Vectors of Extremal Kerr Black HolesM. F. A. R. Sakti*, A. Suroso, and F. P. Zen *Theoretical Physics Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, Indonesia Abstract Kerr black holes are strong candidates for the astrophysical black holes. The understanding of the microscopic structure of this black hole is quite interesting to be investigated. The holography principle is one way to study the microscopic part of Kerr black holes. There have been a conjecture that there is a duality between near-horizon geometry of extremal Kerr black hole and the conformal field theory (CFT) on its boundary of the horizon, called by Kerr/CFT correspondence. Here, we review this correspondence where in the background geometry, boundary conditions are found for which the algebra of surface charges enhances the $$U(1)$$ to one copy of the Virasoro algebra with central charge $$c = 12J$$. After finding the temperature from the chemical potential, which is $$T=1/2\pi$$, the entropy is obtained from the Cardy formula. Finally, the entropy from the Cardy formula agrees with the Bekenstein-Hawking entropy of the extremal Kerr black hole. Topic: Theoretical High Energy Physics 178 Dynamical System of Kaluza-Klein Brane Cosmology with Gauss-Bonnet Term in a BulkIrsan rahman (a*), Bansawang B.J (b), Agus Suroso (a,c), Tasrief Surungan (b), Freddy P. Zen (a,c) a) Theoretical Physics Laboratory, THEPI Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia *irsan275[at]yahoo.co.id b) Department of Physics, Universitas Hasanuddin, Makassar 90245, Indonesia c)Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia Abstract brane-world cosmological model in higher-dimensional spacetime is studied with additional Gauss-Bonnet term in the bulk. By using Gauss-Codazzi equations, we derive the (4+n)-dimensional gravitational field equations. The (4+n)-dimensional gravitational field equations can be formulated to general Einstein field equation with Gauss-Bonnet term and extra component. In the following, we take FRW metric and choose a relation between the external and internal scale factors of the form $$b(t)=a^{\gamma}(t)$$ in which the brane world evolves with two scale factors. Finally, a dynamical analysis is performed to determine the stability of this model. Topic: Theoretical High Energy Physics 179 The Damping Effect on Energy Transfer in Alpha-helical Proteins with the Interspine InteractionImam A Ramadhan (a*), Susan F Rohmah (a), Siti Latifah (a), Donny Dwiputra (a), Wahyu Hidayat (a),(b), and Freddy P Zen (a),(b) a) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10, Bandung, 40132, Indonesia *imamramadhan[at]students.itb.ac.id b) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia Abstract The mechanism of energy transfer in alpha-helical protein was modeled by Davydov and Scott. The interspine interaction between the three channels of alpha-helical protein and damping effect on the probability amplitude of amide-I energy is investigated in this paper. The study resulted a set of three coupled non-linear Schrodinger equation. The resulting coupled NLS is analyzed by Hirota Bilinear Method. The nature of the energy transfer along the protein is studied. Topic: Theoretical High Energy Physics 180 Time-Dependent Damping Effect for the Dynamics of DNA TranscriptionSusan F. Rohmah (1), Imam A. Ramadhan (1), Siti Latifah (1), Donny Dwiputra (1), Wahyu Hidayat (1,2), Freddy P. Zen (1,2) (1) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Instritut Teknologi Bandung Jl. Ganesha (2) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia E-mail: susanferdianti[at]gmail.com Abstract DNA is an interesting macromolecule to study because it plays a role in the body of living beings. A computerized system is performed to analyze the viscosity of fluid around the DNA. The viscosity around the DNA changes over time. This paper modified the Peyrard-bishop (PB) DNA model by involving time-dependent damping. Damping on this model is considered a time-dependent perturbation. DNA Breathing is expressed in the damping nonlinear schrodinger (DNLS) equation and then the variation of the parameters in the analysis using the variational method. This paper show time-dependent damping causes changes in the amplitude and width of the DNA soliton wave. Topic: Theoretical High Energy Physics 181 The Effect of Solvent Viscosity Change on the Nonlinear Dynamics of U-Model MicrotubulesSiti Latifah1, Susan F Rohmah, Imam A Ramadhan, Donny Dwiputra1, Wahyu Hidayat1,2, and Freddy P Zen1,2 1Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Bandung of Technology Institute, Jalan Ganesha no. 10, Bandung, 40132, Indonesia 2Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia Abstract Microtubules are hollow cylindrical protein polymers made up of tubulin dimers and executives in cellular dynamics. To establish the function of living cells, microtubules assemble and disassemble. The experimental results show that the microtubules assemble by growing elongated and closure into a cylindrical polymer when its length is 400nm, glycerol inhibits the closure of the sheet into a tubule and the longer the closing rate decreases, and disassemble when its length is 6,5μm. This model describes the nonlinear dynamics of U-model microtubules that are influenced by the change of solvent viscosity. The system dynamics model is described by the kink-soliton solution obtained by using modified extended tanh-function methode (METH). Modeling results show that as time passes,the solvent viscosity changes, the velocity change. Topic: Theoretical High Energy Physics 182 Fast-forward of entanglement dynamicsIwan Setiawan, Bobby Eka Gunara, Katsuhiro Nakamura Institut Teknologi Bandung Abstract We propose a scheme of the exact fast-forwarding of quantum spin dynamics. The present idea is started from Masuda-Nakamura (e.g., Proc. R. Soc. A 466, 1135 (2010)). We shall consider fast-forward of adiabatic spin dynamics by using a combination of opposite idea of infinitely-large time multiplication and infinitesimally-slow adiabatic dynamics. It allows the acceleration of the wave function from non-entanglement state to entanglement state throughout the fast-forward by generating fast- forward Hamiltonian which include counterdiabatic term. We investigated several examples : Anisotropic XY model, Ising transverse model, and Ising transverse model with general magnetic field, by which we obtain the counterdiabatic Hamiltonian to guarantee the fast-forward scheme. Topic: Theoretical High Energy Physics 183 Phenomenology of Minimal Composite Double Higgs ModelBayu Adi Nugraha Putra*, Jusak Sali Kosasih Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia *bayu.adi.n.p[at]students.itb.ac.id Abstract Higgs mechanism was a method to give mass into all particle in Standard Model. In 2012 research center CERN had detect Higgs particle with mass around 125 GeV. This data was not suitable with calculation, where in high energy there are radiative correction to Higgs mass, so that Higgs have extremely heavy mass (hierarchy problem). Because of that reason there must be new theory that can describe this phenomena, one of the theory is composite Higgs model where Higgs was a composite from Goldstone boson from symmetry breaking. Using composite Higgs model for minimal case and some modification to double Higgs model. Topic: Theoretical High Energy Physics 184 The Field Localization of Yukawa Interaction in a Modified Randall-Sundrum ModelDewi Wulandari 1,2), Triyanta 2), Jusak S. Kosasih 2), Douglas Singleton 3) 1) Physics Department, Universitas Negeri Medan, Jalan Willem Iskandar, Pasar V, Medan Estate 20221, Indonesia. 2) Theoretical High Energy Physics and Instrumentation Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132, Indonesia. 3) Physics Department, California State University Fresno, 2345 East San Ramon Avenue M/S 37, Fresno, California 93740-8031, USA Abstract We study the localization properties of spinor field coupled to scalar field through Yukawa coupling in a Modified Randall-Sundrum (MRS) model. We derive general localization conditions in order to localize this system and solve the solution of field equation corresponding to extra dimension. We obtain that the spinor and scalar fields are localizable on the MRS brane for specific conditions with a decreasing warp factor. Topic: Theoretical High Energy Physics 185 Testing the new BPS method in some models of nonabelian magnetic monopoleIlham Prasetyo (1,2*), Ardian N. Atmaja (2), Handhika S. Ramadhan (1) 1) Departemen Fisika, FMIPA, Universitas Indonesia, Depok 16424, Indonesia *ilham.prasetyo51[at]sci.ui.ac.id 2) Research Center for Physics, Indonesian Institute of Sciences (LIPI), Kompleks PUSPIPTEK Serpong, Tangerang 15310, Indonesia Abstract The proposed method in [{\it Phys. Lett.} {\bf B768} 351-358 (2017)], which can obtain BPS equations of some models of vortices, is used here to see whether it is still usable for some models of magnetic monopole. Other than the standard Yang-Mills-Higgs, here we report that the method is able to give us the BPS equations from two different magnetic monopole models. Topic: Theoretical High Energy Physics 186 Modified Geroch Mass of Two-Surfaces Embedded in Three-ManifoldsF.C. Radjabaycolle(a,b*), F.T. Akbar(a), and B.E. Gunara(a) a) Theoretical Physics Laboratory, Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia b) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Cenderawasih, Jl. Kampwolker Kampus Uncen Baru Waena, Jayapura 99351, Indonesia *flinnradj[at]gmail.com Abstract In this paper, we study several aspects of the modified Geroch functional m_{MG}(\Sigma) of two-dimensional surface \Sigma embedded in three-dimensional manifold (M,g). We parameterized the embedding by a parameter t and using the modified Geroch functional f_{MG}(\Sigma), we prove that m_{MG}(\Sigma) is non-decreasing under the inverse mean curvature flow. We also study the stability of \Sigma using the second variation of the modified Geroch functional with respect to t and finally compare our result with the previous work of Maximo and Nunes. Topic: Theoretical High Energy Physics 187 The effect of external potential to thermodynamical properties of a Longitudinal microtubulesW. Hidayat, A. Sulaiman, S. Viridi3c,d, F.P. Zen Theoretical High Energy Physics and Instrumentations Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia. Abstract Microtubules (MTs) are hollow cylinders usually formed by 13 parallel protofilaments (PFs) covering it. They support neuronal processes and cilia, tracing for intracellular transport that actively organizes material and information within the cell. This paper reports dynamical of MTs and their thermodynamical properties correspond to the existance of additional viscosity. We use Hamiltonian model by adding solvent effect in term of external potential. This pottential might be assumed and capable to describe infected system of MTs. We variate viscousity parameters to observe propagation energy to find many kinds of solitonic types. We also study the termodynamical properties by employing the transfer integral methods and numerical methods (Path Integral Monte Carlo) to calculate partition function. Hence, we calculate specific heat capacity to analyse MTs assembly . Topic: Theoretical High Energy Physics 188 Stability Condition on 4-Dimensional Upper-Half Plane MetricRio N. Wijaya (a*), Fiki T. Akbar (a), Bobby E. Gunara (a,b) a) Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia * rionatanael[at]students.itb.ac.id b) Indonesian Center for Theoretical and Mathematical Physics (ICTMP) Abstract In this paper, we consider four-dimensional upper-half plane metric, which is a generalization of Joyce metric. We analyze the metric through Riemann-Hilbert action with general potential $$V(A,B)$$ and find its stability condition through the Hessian matrix of Hamiltonian. On a special case, we also consider the upper-half plane metric which depends only on one variable and the upper-half plane part is a function of the other part. In this special case, we find that the metric cannot be Einstein in critical point. Topic: Theoretical High Energy Physics 189 Maxwell-Klein-Gordon system with nontrivial coupling on four dimensional Minkowski spacetimeFiki Taufik Akbar, Bobby Eka Gunara Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Abstract In this paper, we study about Maxwell-Klein-Gordon system with non-trivial coupling in four dimensional Minkowski spacetime with potential turned on. We start from Lagrangian of non-trivially coupled Maxwell-Klein-Gordon, then we derive the equations of motion and energy of the system. The coupling and potential function is chosen such that the Lagrangian is gauge invariant. Using Coulomb gauge and conservation of energy, we prove some inequality for energy which will be important to proving the existence of solution. Topic: Theoretical High Energy Physics 190 Kerr-de Sitter metrics in higher dimensionsRamadhiansyah, Bobby Eka Gunara Institut Teknologi Bandung Abstract We analyze general Kerr-de Sitter metrics in all dimensions given by the works of Gibbons et al. General Kerr-de Sitter metric in space-time dimension $$D \geq 4$$, with the maximal number $$(D-1)/2$$ of independent rotation parameters, was given in Kerr-Schild form, in terms of the sum of a de Sitter metric plus the square of a null-geodesic vector and in generalized Boyer-Lindquist coordinates. In this metric, we have re-verified that Einstein equations are satisfied for dimensions $$D \leq 11$$ and discuss the structure of the metrics. Topic: Theoretical High Energy Physics 191 Local existence of scalar wave equation on deSitter universe as a backgroundMuhammad Iqbal, Fiki Taufik Akbar, Bobby Eka Gunara Institut Teknologi Bandung Abstract In this paper, we study about the wellposedness of scalar wave equation on de-Sitter universe as a background with nonmininal coupling. The nonminimal coupling is motivated by Higgs inflation scenario. We start from non-minimal Lagrangian for scalar field on curved background with potential turned on. Then we derive the equations of motion and tensor energy-momentum. Finally, we prove the local existence and uniqueness for the equations of motion. Topic: Theoretical High Energy Physics 192 Field Localization for the 5-Dimensional Nonminimal Derivative Coupling of Scalar Field with Modified Randall-Sundrum ModelMuhammad Rizka Taufani, Agus Suroso, Freddy Permana Zen Institut Teknologi Bandung Abstract Among the extra dimension models, Randall-Sundrum(RS) model is one of the most famous examples for its well--addressing of the hierarchy problems. However, study [1] has introduced the modified RS model which more superior due to its better localization for scalar, vector, and spinor fields. This study uses five dimensional Eintein tensor coupled scalar field or Non Minimal Derivative Coupling(NMDC) of scalar field, such model has been studied widely for GR and cosmological purpose, and verifying its localizaion properties using the modified RS model by taking the warp factor k is equal to zero. The result is the five dimensional NMDC of scalar field is localized, additionally NMDC term is turned into minimal coupling term. Topic: Theoretical High Energy Physics 193 Isobaric Model for Neutral Pion Photoproduction off the Protons with Spin-3/2 and -1/2 ResonancesZulhaji, Agus Salam, Imam Fachruddin, Siti Ani Apriyani Universitas Indonesia Abstract The pion photoproduction on the nucleon have been studied and developed by using the isobaric model at the tree level. The considered reaction is gamma + p --> pi^(0)+ p. The transition amplitudes are formulated in the center of mass system and consist of s-, t-, and u-channel as the Born term, vector mesons term, and the resonances term P33 and P11. As observables, we calculate the total and differential cross section at photon energies up to 1 GeV. The value of the parameters are determined by fitting the calculated observables to the experimental data. Topic: Theoretical High Energy Physics 194 Neutral Pion Photoproduction on the Proton in the Effective Lagrangian ApproachSiti Ani Apriyani(a*), Agus Salam(a*), Imam Fachruddin(b), Zulhaji(b) Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia Abstract We investigate the neutral pion photo-production off the proton by using the effective Lagrangian approach at the tree level. This model contains the Born terms, vector mesons term, and nucleon resonances $P_33$, $P_11$, and $S_11$. The hadronic form factors are also considered to refine the model. We calculate various cross sections at photon energies up to 1 GeV. The value of the parameters are determined by fitting the observables form theoretical calculation to the experimental data. Topic: Theoretical High Energy Physics 195 Canonical Quantization of Geometrized Classical MechanicsDavid Senjaya, Jusak Sali Kosasih Theoretical and High Energy Physics Research Division, Department of Physics, Faculty of mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, INDONESIA Abstract A particle in 3D space with certain potential will move in a curved trajectory like a comet in gravitational potential caused by the star. On the other hand, a free particle in curved space also moves according to geometry of that space. In this paper, the connection between potential energy and space metric will be discussed. So the formulation of classical mechanics in geometric terms can be found and the canonical quantization of it can be carried out. At the end of this paper, as an example, we will consider a particle under isotropic harmonic oscillator potential in two-dimensional sphere, carry out the canonical quantization, and then calculate the energies and their states. Topic: Theoretical High Energy Physics

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