Indonesia Conference Directory

Corresponding Author
Ea Cahya Septia Mahen

Institutions
a. Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, Indonesia 40132
b. Department of Physics Education, UIN Sunan Gunung Djati Bandung, Jl. A. H. Nasution 105 Bandung Indonesia 40614,
c. Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, Indonesia 40132

*Email: ferry[at]fi.itb.ac.id

Abstract
This paper reports the synthesis and characterization of a composite thin film of waste derived acrylic plastic (PMMA) and MAPbBr3 perovskite nanocrystal that prepared by ligand assisted re-precitation (LARP) method. The composite thin film was prepared from MABr, PbBr2, oleic acid and oleylamine, N,N-dimethylformamide (DMF) as precursor, toluene as a solvent, and waste derived PMMA as polymer, and then deposited on glass substrate using a spin coater with varied speed. As the result, The highest transmittance value was around 90% for sample with the high spin speed (3000 rpm). The photoluminescence of MAPbBr3 film when illuminated by UV shows a bright green color with a peak at 536 nm wavelength and maximum luminescence found in the sample with the lower spin speed (1000 rpm). Thus, the fabricated perovskite composite thin film using recycled acrylic plastic has a good prospect to be applied in optoelectronic application

Keywords
Perovskite, PMMA, waste acrylic

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/qBC3Q4LwUpYM

Corresponding Author
Mohammad Haekal

Institutions
a) Biophysics Laboratory, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
*m.haekal.idn[at]gmail.com
b) Nuclear Physics and Biophysics Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Noise is an inherent property of medical imaging and could affect the interpretation of medical images either by human or computer. In deep learning study for medical images, the noise is usually introduced during the training phase of the algorithm in order to make the system able to distinguish the image features in the inferential phase despite the existence of noise. Early hypothesis stated that without the introduction of noise in the training phase, the deep learning system could not distinguish the feature well enough which resulted in lower accuracy in the segmentation. However, due to the classification of the feature that the computer “understands” is unknown in deep learning, this study aimed to evaluate whether the inferential phase of image with noise could still be performed without the introduction of noise in the training phase. The noise will be added artificially in the original test data which would be inferred by the system based on the training of normal (without noise) image. The results would then be compared by using Dice’s Similarity Coefficient (DSC) between the test data with and without noise.

Keywords
medical image segmentation, deep learning, automatic segmentation, noise analysis

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/kwRarAzYF864

Corresponding Author
Dewi Lentang Johor Sri Banu

Institutions
1Department of Physics, Faculty of Mathematics and Natural Science,
Institut Teknologi Bandung (ITB), Jl. Ganesha 10 Bandung 40132, Indonesia
2Research Center for Nanoscience and Nanotechnology (RCNN)
*ferry[at]fi.itb.ac.id

Abstract
Carbon Dots (CDs) are materials that play a role in non-toxicity, biocompatibility, high photostability, changeable photoluminence, high solubility, and easy functionalization. Cellullose Nanofiber (CNF) is an environmentally friendly polymer that has biodegrability, good dispersion capabilities, and able to optimize material characteristics. In this research, CNF was added to the CDS synthesis process to determine the effect of CNF on CDs optical properties. CDs were characterized using Fourier-transform Infrared Spectroscopy (FTIR) to determine the chemical bond content on CDs. Absorbance properties with a UV-Vis spectrometer. Photoluminence properties using a photoluminescent (PL) spectrometer. The results of FTIR characterization obtained indicate that the CNF obtained can maintain the chemical bonds formed on the CD. From the UV-Vis results, the CNF approval gives an increase in the intensity of NIR absorbance from the CDs. While based on the result of PL characterization, there is a decrease in emission intensity from the resulting CDs.

Keywords
Absorbance, Carbon Dots, Cellulose nanofiber, Photoluminescent

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/ckpgQd8YMxPR

Corresponding Author
Nining Yuningsih

Institutions
aPhysics Study Program
bNuclear Physics and biophysics Research Division, Laboratory,Institut Teknologi Bandung,
Jl. Ganesha no. 10 Bandung 40132, Gedung Fisika FMIPA ITB Indonesia


1)ninng.yuningsih[at]students.itb.ac.id
2)dirwanto[at]fi.itb.ac.id

Abstract
Sabu Raijua is one of the small areas in the East Nusa Tenggara (NTT) region with an electrification ratio that has not reached 100%. Additionally, the East Nusa Tenggara (NTT) region also faces a clean water crisis. High-Temperature Gas Reactor (HTGR) is a type of reactor that produces not only electricity but also could be used for cogeneration applications, such as desalination of seawater. In this research, the evaluation of the energy and seawater desalination process using HTGR was analyzed using the Desalination Economic Evaluation Program (DEEP) code. Meanwhile, calculation of reactor design performed by Standard Thermal Reactor Analysis Code (SRAC) code and using Japanese Evaluated Nuclear Data Library (JENDL) 4.0 as nuclear data library. The reactor was designed to produced 150 MWt power while seawater desalination used Multi-Effect Desalination (MED) method. As a result, this reactor design can meet electricity demand in the Sabu Raijua region. Also, seawater desalination yields 110000 cubic meters per day which are meet the needs of clean water.

Keywords
High Temperature Gas Reactor (HTGR), seawater desalination, Multi Effect Desalination (MED)

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/NPxG8Cdr6QwD

Corresponding Author
dessy amirudin

Institutions
a) Master Program in Physics Teaching, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*dessyamirudin[at]gmail.com
b) Faculty of mathematics and Natural Sciences, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
This study aims to analyze the PQRST wave pattern of a normal heart including amplitude (A), time duration (t) and frequency (f) in each of the P, Q, R, S and T waves in the sitting and lying position. Furthermore, this study will create a module Operation of the student experiment cobra4 electrocardiograph instrument. The main system used was a set of student experiment electrocardiograph instruments. The study was conducted in two stages. These were recording the electrical activity of the heart at normal extremities and recording the electrical activity of the heart at the exchanged electrode lead. Each stage recorded two positions such as, sitting and lying position. In each position, the recording was implementing three different ways for the skin electrodes contact (i) direct contact, for example, it was not using gel and sensor gel, (ii) using gel and (iii) using gel and gel sensor. Before the activity was carried out, the operator installed a software measurement for data recording. The output of this recording was a complex PQRST heart wave pattern displayed on a PC. The data that has been displayed was then extracted using Ms.Excel and OriginPro 2016 32bit software. The conclusion from the results of this study is the position does not affect the results of hearts electrical activity recording. The results showed that sitting and lying position data were not much different. The example was taken from subject A. When the normal extremity in sitting position, the value of the amplitude interval (A), the duration of time (t) and frequency (f) of each wave were the P wave ((A): 19.00 mV - 51.76 mV, (t): 0.08 s - 10.11 s, and (f): 65.32 Hz - 92.37 Hz), Q wave ((A): 7.20 mV - 25.00 mV, (t): 0.03 s - 0.04 s, and (f): 65.48 Hz - 92.51 Hz), R wave ((A): 363.00 mV - 439.78 mV, (t): 0.06 s - 0.09 s, and (f): 65.59 Hz - 92.48 Hz), S wave ((A): 8.40 mV - 29.00 mV, (t): 0.03 s - 0.06 s, and (f): 66.45 Hz - 91.73 Hz), and T wave ((A): 58.63 mV - 162.61 mV, (t): 0.21 s - 0.24 s , and (f): 65.47 Hz - 92.63 Hz). Meanwhile, the value of the amplitude interval (A), time duration (t) and frequency (f) of each wave in subject A when lying position were P wave ((A): 29.57 mV - 59.71 mV, (t): 0.09 s - 0.14 s, and (f): 67.22 Hz - 83.71 Hz), Q wave ((A): 7.15 mV - 25.00 mV, (t): 0.03 s - 0.04 s, and (f): 66.41 Hz - 83.97 Hz), R waves ((A): 268.00 mV - 443.00 mV, (t): 0.07 s - 0.09 s and (f): 66.92 Hz - 83.49 Hz), S waves ((A): 10.40 mV - 23.00 mV, (t) : 0.03 s - 0.05 s, and (f): 67.08 Hz - 83.96 Hz), and T waves ((A): 68.64 mV -174.00 mV, (t): 0.21 s - 0.28 s, and (f): 67.15-83.70). The PQRST wave pattern displayed in the normal extremity leads for each position produced normal heart waves. However, if the electrode lead was exchanged, the PQRST heart wave pattern in each position was reversed. In the final stage of the study, it created a student experiment cobra4 electrocardiograph instrument module.

Keywords
amplitude (A), time duration (t), frequency (f) and student experiment cobra4 electrocardiograph

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/gN6jRUVkpmv2

Corresponding Author
Bagus Endar Bachtiar Nurhandoko

Institutions
1 Physics Department, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, Indonesia;
2 Rock Fluid Imaging Lab, Bandung, Indonesia
3 Telkom University

Abstract
Pore pressure prediction methods have been developed by several researchers who only use well log data as a basis for determining the relation between velocity and pore pressure. Pore pressure prediction by using laboratory measurements to get the relation with velocity is still rarely conducted. In this paper, the prediction of pore pressure is done in multi-stages or sequentially involving the results of rock physics laboratory measurements for each reservoir lithology (carbonate, basement, and sand) and combining them with field measurement data for each well using statistical rock physics and statistical neural network methods. This method involves all measurement data from the core in the laboratory, well data, including data: lithology, measurement of pressure data in well (RFT, DST, etc.), hydrostatic trend, acoustic and elastic log data, porosity, and mud weight information. The whole data are trained using statistical neural network. Then, the knowledges are used to predict the pore pressure by considering lithofasies of log and also seismic lithology.

Keywords
Statistial Neural Network, Pore Pressure, Seismic Rock Physics

Topic
Earth and Planetary Sciences

Link: https://ifory.id/abstract/m6XMVNfWRwKq

Corresponding Author
Ardian Nata Atmaja

Institutions
Physics Research Center
Indonesian Institute of Sciences

Abstract
We generalize BPS Lagrangian method and rederive BPS equations for monopoles and dyons from the Lagrangian of SU(2) Maxwell-Higgs model in four dimensional spacetime. We show that in the BPS Lagrangian method the Gaussslaw constraint does not necessary to be imposed beforehand. We find that the BPS Lagrangian has non-boundary terms which in turn gives us some constraint equations. These constraint equations can be reduced by taking the standard BPS equations for Monopoles and Dyons, which turns out to be the Gausss law constraint in the BPS limit.

Keywords
Monopoles, Dyons, BPS equations, Gausss law constraint

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/6v9X4AwnQc2L

Corresponding Author
Abiyoga Noeriman

Institutions
a) Physics Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
*abiyoganoeriman[at]gmail.com
b) Industrial Technology Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Nowadays, environmental issue become one of interesting issue to talk about. Everything that human done connects with their environment. One of the example is using daily product to sustain their live, such as wood for housing or furniture. Wood board that is made by cutting tree is the concern, because the need is increasing. On the other hand, we have to maintain the forest. Concerning this issue, developing fiber-based composite board can be an alternative. Pineapple leaf fiber – epoxy resin composite with varied compositions have been prepared in Biophysics lab, Physics Department of ITB, using a simple mixing method followed by hot pressing ( 0.22183 MPa, 100°C) for 3 hour. The main characterization of the composite is the mechanical properties. Other characterization represented the quality of a board such as density and water absorption level, also will be carried out.

Keywords
Composite; Fibre board; Pineapple fibre; Tensile

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/Ddm9zqkgQKrM

Corresponding Author
Dziban Naufal

Institutions
a) Department of Physics, Universitas Padjadjaran
*dziban14001[at]mail.unpad.ac.id
b) Faculty of Medicine, Universitas Padjadjaran

Abstract
Our study about chromosomes imaging using DAPI stimulating light and soda lime glass microspheres whose diameters are spread from 35 μm to 120 μm shows that the magnification power of this system is 3 to 5 times. Images of chromosomes that colored with DAPI beneath the microspheres are observed have a size 3 to 4 times larger than the actual chromosomes. In addition, using microsphere lens approximation, the magnification power of chromosomes image without DAPI is 3.8 to 12.6 times whereas the magnification power of DAPI-stained chromosomes is 3.7 to 4.8. The spherical lens approximation does not show any variation of magnification even though the microsphere’s diameter is changed. Experimentally, there is an evident that microspheres can improve the performance of microscope in chromosomes imaging. This system is potential to engineer the optical microscope by applying photonics jet phenomenon.

Keywords
photonic jet; microsphere; chromosome; DAPI; magnification

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/UWpdwczLngyf

Corresponding Author
Fahdzi Muttaqien

Institutions
a) Department of Computational Sciences, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

b) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Study the adsorption and reactivity of CO2 on surfaces are of great interest in technological application and fundamental sciences. Moreover, CO2 reduction into more valuable compound has been also the most effective strategy to reduce the green house effect in the atmosphere. Nowadays, graphene has been proposed as a support of catalytic materials to adsorb and reduce CO and CO2. Graphene becomes more reactive when we introduce transition metal as an adatom or dopant.[1,2] In this research, we focus on elucidating the adsorption of CO2 on pristine graphene, and graphene with Ni adatom and dopant. We performed density functional theory (DFT) study of CO2 adsorption on graphene with and without Ni adatom/dopant. We implemented van der Waals (vdW) interaction correction to accommodate weakly interaction between CO2 and graphene. In addition to those, we also compared our results with general PBE calculations. Based on vdW functional calculations, we obtained that CO2 is physisorbed on pristine graphene with adsorption energy of 0.17 eV. Meanwhile, PBE shows almost repulsive interaction between CO2 and graphene. These results are in good agreement with previous works.[3] Single Ni adatom/dopant and small Ni cluster increase the activity of graphene. We obtained that CO2 is more stable on graphene with Ni adatom rather than with Ni dopant. It turns out that Ni adatom is more reactive than Ni dopant. We noticed that Ni adatom and dopant have different local properties of electronic d states. The difference in local d state may cause variations in reactivity.[4,5] The adsorption energy further increases when we introduced small Ni cluster on graphene. The adsorbed CO2 bond angle on graphene with Ni adatom/dopant and small cluster is distorted from its gas phase condition of 180°, indicating that CO2 is chemisorbed on the decorated graphene area. Our results then provide useful insight into appropriate design of graphene supported metal catalysts. References: [1] X. Liu, Y. Sui, T. Duan, C. Meng, and Y. Han, Phys. Chem. Chem. Phys. 16, 23584-23593 (2016). [2] H. Xu, W. Chu, W. Sun, C. Jiang, and Z. Liu, RSC Adv. 6, 96545-96553 (2016). [3] K. Takeuchi, S. Yamamoto, Y. Hamamoto, Y. Shiozawa, K. Tashima, H. Fukidome, T. Koitaya, K. Mukai, S. Yoshimoto, M. Suemitsu, Y. Morikawa, J. Yoshinobu, and I. Matsuda, J. Phys. Chem. C 121, 2807 (2017). [4] B. Hammer, Y. Morikawa, and J. K. Nørskov, Phys. Rev. Lett. 76, 2141-2144 (1996). [5] B. Hammer, Surf. Sci. 459, 323-348 (2000).

Keywords
CO2 adsorption; Graphene; Catalytic activity

Topic
Computational Physics

Link: https://ifory.id/abstract/8rZm6WYaH3Fh

Corresponding Author
Rosliani Widia Pamungkas Isburhan

Institutions
a) Master Program of Geophysical Engineering, Institut Teknologi Bandung
b) Global Geophysics Group, Institut Teknologi Bandung
c) Research School of Earth Sciences, The Australian National University

Abstract
Palu City is a city on the island of Sulawesi with very complex geology. There are many active faults on Sulawesi Island, one of which is the Palu-Koro Fault system which extends NNW-SSE direction. Thick sediment under Palu City can cause amplification of the soil during an earthquake so that the damage will be quite severe. In order to characterize the subsurface structure of the City of Palu, microtremor data processing was carried out from 22 stations using the Horizontal-to-Vertical Spectral Ratio (HVSR) method. HVSR is a method for obtaining subsurface information from a single station measurement that can be used to examine seismic risk. HVSR is measured by comparing the Fourier spectrum of horizontal components with vertical components. The amplitude of this ratio, H/V curve, is varying with frequency. The H/V curve containing amplification information and the related dominant frequency which can then be inversted to obtain subsurface information, such as S-wave velocity and layer thickness. In this study, the inversion was carried out by using the PSO (Particle Swarm Optimization) algorithm. The PSO algorithm is stochastic optimization technique inspired by social behavior of bird flocking when searching a promising area for food. In order to evaluate the consistence of obtained results we also compare with the model from OpenHVSR program. The obtained shear velocity model shows that low velocity zone (less than 700 m/s) related to the sediment layer is around 200 m with a relatively small misfit at around 1.3.

Keywords
HVSR; S-wave Inversion; Monte-Carlo Algorithm; PSO

Topic
Earth and Planetary Sciences

Link: https://ifory.id/abstract/cm4g8wHQCaL9

Corresponding Author
fauzan ghilman anshari

Institutions
a) Bandung Institute of Technology, Department of Physics, Jl. Ganesa 10, 40132, Bandung, Indonesia
fauzan.ghilman[at]gmail.com
b) Bandung Institute of Technology, Nuclear Physics and Biophysics Research Division, Department of Physics, Jl. Ganesa 10, 40132, Bandung, Indonesia

Abstract
High Temperature Test Reactor (HTTR) is one type of IV generation reactor with high temperature gas-cooled designed with low-enriched uranium. The purpose of this study is to compare various coolants in the reactor to obtain optimal coolant. Coolant is a material used to cool the reactor. In this study compared three types of material, namely Helium, Pb-Bi and CO2. In this study also calculated with three types of reactor fuel, namely UO2, (Th,U-233)O2, and (U,Pu)O2. The parametric survey conducted is to do enrichment variations between 1 - 10%. The parametric survey results that meet the operating targets for UO2 and (Th, U-233)O2 fuels are 5% for Helium coolers, 6% for Pb-Bi coolers and 4% for CO2 coolers. Whereas fuel (U,Pu)O2 only reached the operating target for 9% enrichment on CO2 coolers. It was found that CO2 coolers were the best coolers among the three coolers compared. The reactor cell calculations are performed using the SRAC 2006 program, and utilize JENDL4.0 nuclide data.

Keywords
coolant, enrichment, HTTR, neutronic aspects

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/xYZtnuDyqVW4

Corresponding Author
Hadyan Luthfan Prihadi

Institutions
Theoretical High Energy Physics, THEPI Division, Institut Teknologi Bandung, Jl. Ganeca 10 Bandung, Indonesia

Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, 40132, Indonesia.

Abstract
In this article, we present some works on the detector part of COMET (COherent Muon to Electron Transition) experiment. The detector system of the COMET experiment uses scintillating materials and photodetectors in general. We apply high voltage input and measure the Gain of a photodetector named MPPC (Multi Pixel Photon Counter) and it is linearly dependent with the high voltage input. After that, we attach an LYSO (Lutetium-Yttrium Oxyorthosillicate) crystal as a scintillating material to the MPPC and then measure the natural radioactive process at around 597 keV energy spectrum and also detect the presence of cosmic-ray muons at around 28.4 MeV energy spectrum.

Keywords
COMET, Cosmic Ray, MPPC, Muon, LYSO, Particle Detector

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/r4B9Vxmu7dHM

Corresponding Author
Bagus Endar Bachtiar Nurhandoko

Institutions
1 Physics Department, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, Indonesia;
2 Rock Fluid Imaging Lab, Bandung, Indonesia

Abstract
Cap-rock integrity as well as reservoir integrity assessments have become a key element in the design and operation of steam injection projects and a critical element in the selection of a maximum steam injection operating pressure. The applicability of steam injection requires good knowledge of reservoir and geomechanic aspects. In addition, injecting steam into a very shallow unconsolidated reservoir has potential risk of having loss of containment issue. By necessity, these cap-rock integrity assessments involve geomechanical engineering principles and have generally lead to more use of reservoir-geomechanical simulations (one way coupled or sequentially coupled) in the establishment of what is termed “safe” maximum steam injection pressures. In this method, geomechanical parameter (stress state model (overburden, hydrostatic and pore pressure), elastic model (Young Modulus, Shear Modulus, Poisson including failure criteria i.e. Mohr-Coulomb), and rock’s reservoir properties (lithology, porosity, permeability, water saturation etc.) are required as input data. The methods will integrate the whole data with coupled reservoir properties and geomechanics modeling to calculate changes of rock strength due to steam injection. These cap-rock assessments have included geological framework studies of caprock, insitu stress determination, reservoir and cap-rock property characterization, failure criteria from numerous situations and numerical simulations to ensure the steam injection scenario always in proper condition. Alternative injection scenarios are suggested to be performed in risk area, as follows: (a) Steam injection and production are performed simultaneously; (b) steam injection, heating and production are performed simultaneously; (c) heating, production and injection are performed sequentially.

Keywords
Geomechanics, Caprock Integrity, Time dependend Temperature-Chemical Alteration, Rock Physics

Topic
Earth and Planetary Sciences

Link: https://ifory.id/abstract/eC27Xzjw8FPy

Corresponding Author
Meqorry Yusfi

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia
*meqorryyusfi[at]sci.unand.ac.id
b) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Bandung, Indonesia
c) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Padang, Indonesia

Abstract
The adsorption of C2H2 and C2H4 gas molecules on Ni-doped singe-wall carbon nanotubes (Ni-CNT (10,0)) was investigated using Density functional theory (DFT). To discover the highest binding energy, three Ni-CNT configurations that are bridge, hollow, and top position of Ni on CNT were calculated. The Ni on the bridge configuration was found to be the most stable configuration based on binding energy and Ni-C bond length analysis. As addition of Ni to CNT, the band gap energy of CNT becomes narrower from 0.879 eV to 0.289 eV. The C2H4 adsorption energy was acquired stronger than C2H2 which resulting a smaller band gap. Also, the geometry change of the gases/Ni-CNT was investigated in this research. This result would be useful to proposed Ni-CNT as an active material for hydrocarbon gas sensor.

Keywords
CNT, Ni, Adsorption energy, DFT, band gap

Topic
Computational Physics

Link: https://ifory.id/abstract/gTLEvpq9cu6Y

Corresponding Author
Estri Trimayanti

Institutions
a) Master Program in Physics Teaching, Institut Teknologi Bandung, Indonesia
*estriester53[at]gmail.com
b) Nuclear Physics and Biophysics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
c) Physiology, Animal development, and Biomedical sciences, School of Life Sciences and Technology, Institut Teknologi Bandung, Indonesia

Abstract
Exposure of electric fields and magnetic fields affect sperm quality. Analysis of sperm quality is still one of the most important tools for evaluating a mans fertility. This sperm quality can affect fertilization. Sperm quality includes several aspects including motility or motion and viability. The purpose of this study was to determine the motility, viability, and type of charge of mice sperm (Mus muculus) through the study of exposure to electric and magnetic fields in ex vivo conditions. Observations were carried out in the time span (∆t) for sperm without influence and that affected the electric field. Sperm of mice is diluted with a solution of Phosphate Buffered Saline (PBS) and then put into a hemasitometer placed between two iron plates connected to a DC voltage source. The distance between the two plates d = 7.0 cm and the magnitude of the voltage varied, namely ΔV = 0 (control), V = 12.5 V, and V = 25.0 V. The magnitude of the magnetic field from the solenoid used is B = 4.7 x 10-4 T. Sperm observed using a fluorescence microscope then recorded using NIS Elements software. Furthermore, sperm movement is analyzed using Tracker software. Sperm without electric field (ΔV = 0) has a viability of 60 minutes longer than sperm that is affected by the electric field (ΔV = 12.5V and ΔV = 25.0V) which has a viability of 30 minutes. Sperm moves randomly almost in all directions if without the influence of the electric field, but sperm tends to move to the positive plate if it is under the influence of the electric field. Normal sperm quality is characterized as having zigzagging sperm that is fast and 25%. From the results of this study the results showed that fast zigzag motion had a velocity of v> 37 µm / s. The maximum rate decreases with increasing observation time. Whereas in the influence of the magnetic field the sperm moves in a clockwise direction. Based on the direction of sperm movement it can be seen that sperm are negatively charged.

Keywords
sperm, motility, viability, charge of sperm

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/ZwMNegnbj4kv

Corresponding Author
Triati Dewi Kencana Wungu

Institutions
a) Nuclear Physics and Biophysics Research Group, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
*triati[at]fi.itb.ac.id
b) Theoretical High Energy Physics and Instrumentation Research Group, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
The density functional theory (DFT) study of the Pb intercalation in the Montmorillonite was investigated. The influence of Al doping on the tetrahedral silicate layer and Mg doping on the octahedral layer of montmorillonite was analyzed. The change in geometric structure due to the Pb intercalation in the montmorillonite was observed. The results indicated that Pb is tend to be located on the ditrigonal surface of montmorillonite and it is near the area of doping atoms (Al. Mg). The intercalation of Pb creates the Pb-O bond formation.

Keywords
DFT, Pb, montmorillonite

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/HPYRpzvXxM6J

Corresponding Author
Agustina Widiyani

Institutions
1Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.
2Department of Physics, Faculty of Sains, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Jati Agung Lampung Selatan 35365, Indonesia.
3Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.

a) a.widiyani[at]students.itb.ac.id
b) agussuroso[at]fi.itb.ac.id
c)fpzen[at]fi.itb.ac.id

Abstract
We study the scenario of dark energy model that constructed by combination of scalar fields from quintessence and nonminimal derivative coupling terms. We assumed that there will be exchange between the scalar fields of quintessence and nonminimal derivative coupling and the ordinary matter do not explicitly coupled with the dark sector. Using the dynamical system analysis, we determine the stability of our model and find the attractor solution.

Keywords
Dark energy, scalar field, quintessence, nonminimal derivative coupling, dynamical system

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/tV7zj6kwqcHR

Corresponding Author
Prian Jaya

Institutions
Division of Theoretical High Energy Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract
Black hole is an object with a strong gravitational interaction where classically no particles even light can escape from it. The spacetime of a black hole is described by a metric satisfying the Einsteins equation under the general relativity. A simple solution of the Einsteins equation for a black hole system yields inevitable singularities at $r=0$ and $r=2M$ on the spacetime. Such singularities are difficult to explain through physics laws. A metric function, denoted by $f(r)$, was introduced to generalize some well-known solutions such as the Schwarzschild and Reissner-Nordstr"om metrics, which leads to other possible solutions, including regular black holes. The Reissner-Nordstr"om is a charged black hole where its potential leads to a metric function depending only on radius $r$. Regarding this concept, we propose a black hole system with magnetic charge whose magnitude and direction resemble Earths magnetic field. Thus, it is necessary to extend the metric function to $f(r, heta)$, since we use a model of the Earths magnetic field where the magnetic potential depends on the polar angle $ heta$. We present a search for this new type of regular black holes and there might be possibility to generalize to a class of black holes with a metric function $f(r, heta)$.

Keywords
Black Hole; Nonlinear Electromagnetics; Reissner-Nordstr"o; Singularity

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/JWjzxDnbkpNm

Corresponding Author
Lukas Primahatva Adhitya Krisna

Institutions
Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Research Center for Physics, Indonesian Insitute of Sciences (LIPI)

Abstract
The efficiency of a thermoelectric material to be used as a heat machine is characterized by its thermoelectric figure of merit ((ZT)). The figure of merit itself is dependent on three transport quantities: (1) electrical conductivity ((sigma)), (2) Seebeck coefficient or thermoelectric power ((S)), and (3) electrical thermal conductivity ((kappa_e)). The three quantities are calculated through Boltzmann transport theory using constant and inverse-density of state relaxation time approximation. In this paper, we investigate the thermoelectric properties of various width of ribbon system containing topological edge states. These systems are discussed here due to its unique nature for having both insulating states inside the ribbon and conducting states at the edge which is topologically protected. The width of the ribbon depends on the number of one-dimensional wire stacking. We seek to determine the enhancement effect of manipulating this quantity on thermoelectric properties of the ribbon system and compare it to the conventional bulk system on two-dimensional semiconductors.

Keywords
edge states, ribbon system, topological materials, thermoelectric properties

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/rNumhCp3ngjF

Corresponding Author
Wiendartun Wiendartun

Institutions
Department of Physics Education FPMIPA UPI

Abstract
Silicon Oil, which is commonly used in vitreoretinal surgery, is known as Polydimethylsiloxane (PDMS). Silicone oil is used as a substitute for vitreous humor in vitreoretinal surgery. Silicone oil is needed in Indonesia and must be produced with sufficient quality and quantity for domestic needs, currently vitroretinal surgery still uses silicone oil imported from abroad. In this study, PDMS has been synthesized using an addition polymerization process with a polymerization chain growth mechanism, with the monomer octamethylcyclotetrasiloxane, the initiator of Pottasium Hidroxida and the hexamethyldisiloxane chain terminator. The duration of mixing varied from 20 minutes, 30 minutes and 40 minutes, to study the effect of time on PDMS characteristics. The PDMS synthesis we produce is between 65.30% and 86.71% with various viscosities in the range of 900 m.Pa.s and 5000 m.Pa.s. FTIR spectroscopic measurements were found that all synthesized samples were found to have functional groups and structures similar to commercial silicon oil. UV-Vis and refractometer measurements, all samples have transmittance close to 100% and refractive index between 1.3589 and 1.4059. The effect of the length of time on the PDMS gel is on the viscosity the longer the mixing time the higher the viscosity, this mixing occurs at 170oC, stirred using a magnetic stirrer with 300rpm and the concentration of 1M Pottasium Hydroxide. In this study the propagation stage to form a gel began to form in 20 minutes.

Keywords
addition polymerization, chain growth mechanism, polydimethylsiloxane

Topic
Biophysics and Medical Physics

Link: https://ifory.id/abstract/dPDTbcznfhuG

Corresponding Author
Miftahul Maarif

Institutions
Physics Departement of Graduate Program, Sebelas Maret University, Surakarta, Indonesia

Abstract
We investigate energy levels of a diatomic quantum dot by using an analytical solution of Hamiltonian that will reduced to Schrodinger equation. We solved the one dimensional Schrodinger equation with the presence of Quantum deformation in the radial part. We obtained the ground state and the next excited states eigen values by using supersymmetric quantum mechanics (SUSY QM) method.

Keywords
Quantum Dot, Quantum Deformation, Schrodinger Equation

Topic
Interdisciplinary Physics

Link: https://ifory.id/abstract/QmJh9vjbYqBp

Corresponding Author
Donny Dwiputra

Institutions
a) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung, 40132, Indonesia
*donny.dwiputra[at]ymail.com
b) Badan Pengkajian dan Penerapan Teknologi, BPPT Bld. II (19 th floor), Jl. M.H. Thamrin 8, Jakarta 10340, Indonesia}
c) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia

Abstract
The properties of many-body open quantum systems can be engineered in myriad of ways by appling external driving fields. Of interest here is the gain of transport efficiency due to the application of driving to exciton transport in a chain of qubit network. The key to explain the wide range of many-body phenomena is understanding how quantum entanglement propagates within the system. We study the entanglement properties between the qubit sites and analyze its role in energy transport in presence of external periodic driving. These results contribute to the understanding transport in noisy systems and point toward the prospect for designing advanced materials and structure assisted by noise and external driving.

Keywords
Quantum Mechanics, Open Quantum Systems, External Driving, Quantum Entanglement

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/GM9Xj6xBLzk8

Corresponding Author
Melati Ifthacharo

Institutions
(a)Master Program of Physics Department,
Faculty of Mathematics and Natural Science, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*Melati.ifthacharo[at]student.itb.ac.id

(b)Nuclear Physics and Biophysics Research Division, Physics Department,
Faculty of Mathematics and Natural Science, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia

(c)Doctoral Program of Physics Department,
Faculty of Mathematics and Natural Science, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
There are many systems in a reactor shutdown function in MSR in addition to inherent self-stabilization. One of those systems is the fuel-salt drain system. The present study focused on the melting and solidification phenomenon that occurs in the freeze valve. An experiment was performed to investigate the erosion behavior of a solid plate by an impinging liquid with respect to time. In addition, a numerical modelling based on MPS method to visualize the heat distribution in the plate will also be carried out. The experiment will be conducted by varying the parameters such as the liquids, temperature, and diameter. Hot water (70 and 90oC), molten paraffin, and cooking oil, will be used while both molded candle and paraffin wax will serve as the target plates. The dimension of the target plate is a cylindrical with 44 mm in thickness and 140 mm in length for both paraffin and candle wax. Heat distribution images will be acquired using FLIR thermal video camera. The data then will be compared to the MPS simulation. Recent results showed that cooking oil outperformed hot water and liquid paraffin by having the shortest penetration time but not necesarrily the fastest erotion rate.

Keywords
Erosion behavior; Heat transfer ; MPS

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/9ZarTymB3cQU

Corresponding Author
Duwi Hariyanto

Institutions
(1) Nuclear Physics and Biophysics Research Division, Physics Department, Institut Teknologi Bandung
(2) Nuclear Science and Engineering Department, Institut Teknologi Bandung
Jl. Ganesha 10 Bandung, 40132, Indonesia
Email : (a) duwi_hariyanto[at]students.itb.ac.id, (b) psidik[at]fi.itb.ac.id

Abstract
The natural circulation loop is one of the design concepts of a cooling system in new advanced reactors that has attracted many researchers to develop it. This study aimed to perceive the effect of horizontal width variation on the thermal behavior of a single-phase natural circulation loop (NCL). NCL apparatus with a vertical heater and a vertical cooler was designed for experimental study. The height of the loop was 1.000 mm while the width of the loop was varied at 500 mm and 1.000 mm. The heater was designed using nichrome wire on the outside of the stainless pipe while the cooler was designed using pipe-in-pipe with water flowing through the annulus. Arduino microcontroller and K-type thermocouple sensors were used in temperature data acquisition. XAMPP software was used in data recording. The direction of the fluid flow was in a clockwise direction. The result in this study was the fluid temperature in a 1.000 mm width lower than the fluid temperature in a 500 mm width. This study is supposed to be one of the references for a single-phase natural circulation loop.

Keywords
natural circulation, single-phase, temperature, microcontroller, K-type thermocouple

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/nPFwA83VRmKL

Corresponding Author
Bilal El Bari

Institutions
a)Nuclear Physics and Biophysics Research Group, Department of Physics,
Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*bilalelbari[at]students.itb.ac.id

Abstract
Thermal-hydraulics aspect is one of the crucial aspects that must be considered when reactor design and operation analysis were performed, because this aspect involves security, safety, and efficiency factor that must have to be examined. In this study, thermal-hydraulics aspect of the HTR-10MW (which classified into Pebble-Bed Reactor or PBR) were analyzed by reviewing the fast neutron irradiation influence using the modified PEBBLE program (or mPEBBLE), this program using finite-difference numerical method for solving the differential equation of the system. In reviewing fast neutron irradiation, the thermal conductivity value of fuel is induced by fast neutron irradiation dose. The study concludes that fast neutron can influence the fuel thermal conductivity. The value of fuel thermal conductivity can induce the thermal-hydraulics aspect of PBR core which is so important to be understanding more the safety ability of PBR core.

Keywords
Fast Neutron Irradiation, Finite-Difference, Thermal-Hydraulics Aspect, Pebble-Bed Reactor, Wall Effect.

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/tK84FnVUdR9q

Corresponding Author
Deriyan Senjaya

Institutions
a) Theoretical Physics Laboratory
Department of Physics
Bandung Institute of Technology
Jalan Ganesha No.10, Bandung 40132, Indonesia
*deriyan191293[at]gmail.com

Abstract
Dirac-Weyl Semimetal (DWS) is a Dirac material with exotic properties that appear due to the presence of Massless Dirac Fermion (MDF). If the MDF is confined by certain potential, for example 1D coulomb potential, the exotic properties of DWS will increase. The enhancement also occurs simultaneously with a slow manipulation on coulomb potential, compared to MDF motion with parameter alpha_{t}. This enhancement particularly happens on its electrical transport properties because the MDF adiabatic dynamic is related to current. The enhancement gives an opportunity to DWS to be applied as FET, but the presence of adiabatic dynamic automatically generates slowly current enhancement. Therefore, we need to formulate auxiliary potential to accelerate the current enhancement. The auxiliary potential formulation was done by fast-forward method. The effect of these formulation was tested on graphene as DWS example with length L = (5 x 10-6; 2), then the current enhancement was examined with electrical conductance. Based on our result, manipulation of coulomb potential in 1 second increases the graphene conductance 1.153 and 1.057 times, respectively. The presence of conductance shift clearly indicates the current enhancement acceleration when an auxiliary potential is applied within the manipulation.

Keywords
Dirac-Weyl Semimetal; 1D Coulomb Potential; Adiabatic; Field Effect Transistor; Fast-Forward Method; Electrical Conductance

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/rXKwJ6DMb3cy

Corresponding Author
Rizqi Fadli

Institutions
Institut Teknologi Bandung

Abstract
In this paper we consider a class of black holes in Einstein-Skyrme theory in even dimensional theories with negative cosmological constant Λ turned on. In addition, the Skyrme scalar field is chiral admitting a complex unitary group SU(2). We take some assumptions as follows. First, we simplify the spacetime to be conformal to a product space ( mathcal{M}^4 × mathcal{N}^{N−4} ) where (mathcal{M}^4) and ( mathcal{N}^{N−4} ) are a four dimensional spacetime and a compact Einstein ((N − 4))-dimensional submanifold with (N ≥ 4), respectively. Second, the representation of the group SU(2) is taken to be fundamental which means that we can use the (2 × 2) Pauli matrices in the theory. Third, the Skyrme field is static which depends only on the radial coordinate r. Then, we derive the Einstein field equation and the scalar equation of motions related to these setups. Our analysis shows that near boundaries, namely near horizon and around the asymptotic region, the geometries are of constant scalar curvature. To be precise, the near horizon geometry is a product space, whereas the geometry in the asymptotic limit is Einstein with negative cosmological constant. Finally, we perform Lipshitz localization method to show the local existence of solutions, and then, using the energy functional we show that finite energy solutions could exist.

Keywords
Einstein-Skyrme Model, Black Hole, Chiral SU(2) Scalar Field

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/hbMKRZxtrAHu

Corresponding Author
Asep Rohiman

Institutions
Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. Republic of Indonesia
Jl. Diponegoro No. 57 Bandung 40122, Indonesia

*The corresponding author’s e-mail address : asep.rohiman[at]esdm.go.id

Abstract
Fossil fuels are the main fuel that is still used by the community. Along with the increasing population of Indonesia, the need for oil and gas fuel is also increasing. Therefore, oil and gas exploration activities are needed to obtain new economical reserves. A regional surface soil gas survey consisting of 300 sites were placed on approximately 1 km intervals using existing rivers, streams and navigable waterways within the onshore portion of the Boka area located in Mimika Regency in Papua for evaluation of the hydrocarbon potential. This soil gas data contains very large magnitude anomalies consisting of a unique mix of light hydrocarbons (methane, ethane and propane) and carbon dioxide. Generally very large concentrations of methane and CO2. In this case, these two gases (methane and CO2) have a clear association with the larger petrogenic ethane and propane gases. In addition these coherent anomalies occur at sites where the ethane/propane ratio exhibits somewhat noisy ratios with some sites having ratios less than one, a condition that is generally found only within macro gas and oil seepage environments where both volatilization and degradation can randomly alter their ratios. The logical conclusion is these biogenic gas anomalies associated with noisy ethane/propane ratios are evidence of a macro seepage environment. In spite of the very regional spacing (1 km) the largest magnitude anomalies clearly suggest two main clusters of anomalies. One occurs on and along strike with the Aiduna fault zone, and the second clusters along the coast line near the mouth of the Aiduna and Umari rivers. These anomalies suggest deep source oil potential exists over the entire area surveyed. The Aiduna River traverse crosses the northern trace of the inferred Aiduna fault with more impressive anomalies, including the largest magnitude propane and C2+ gases found, following fairly close to the Aiduna fault trace. These oily soil gas anomalies confirm the existence of a wide-spread and active subsurface petroleum system. Given adequate density, it appears that future soil gas surveys could provide a cost effective approach to focusing on and defining areas which could be further developed before much more expensive exploration tools (seismic) and drilling are employed. An offshore sampling survey might confirm and extend these coastal anomalies into the adjacent offshore.

Keywords
microseepage, geochemistry, mimika, oil and gas, gas chromatography

Topic
Earth and Planetary Sciences

Link: https://ifory.id/abstract/ZkNcxX4QWReu

Corresponding Author
Andrey Kosasih

Institutions
(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesa 10, Bandung 40132, Indonesia
(b) Nuclear Physics & Biophysics Research Division, Department of Physics, Faculty of
Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesa 10, Bandung 40132, Indonesia
*awaris[at]fi.itb.ac.id

Abstract
The high temperature engineering test reactor (HTTR) is a block-type high-temperature gas-cooled reactor (HTGR) developed by Japan. This reactor can operate with outlet temperature of 950°C and the heat can be used for the cogeneration of electricity and hydrogen production. In this study, the neutronic analysis is carried out for the helium cooled HTTR reactor with (Th, U-233)O2 fuel. The fuel blocks used in the core vary from 3,3% to 7,5% of U-233 content. The calculations are performed by PIJ and CITATION modules on SRAC2006 code system with JENDL-4.0 as the nuclear data library. The cell-burnup calculations are conducted with two models, with and without microscopic cell definition in the fuel compact. The core calculations are conducted with triangular-z and hexagonal-z core geometry. Several neutronic parameters are analyzed, such as effective multiplication factor (k-eff), conversion ratio, changes in atomic density for fissile and fertile materials, neutron spectrum, power density distribution, and power peaking factor. The results show similar neutronic parameters with model 1 and 2. The k-eff is greater in model 1. The neutron spectrum is dominant in the thermal energy. Both core geometries show similar results with greater k-eff in the triangular-z geometry. The maximum power density is located at the fuel block with 5,5% of U-233 content.

Keywords
HTTR, JENDL-4.0, k-eff, neutronic, SRAC2006

Topic
Nuclear Science and Engineering

Link: https://ifory.id/abstract/BYbgkPpJxrnV