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Asril Pramutadi Andi Mustari
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Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA
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INDONESIA
Indonesian Journal of Physics (IJP)
Published by Institut Teknologi Bandung
ISSN : 23018151     EISSN : 29870828     DOI : https://doi.org/10.5614/itb.ijp
Core Subject : Science, Engineering,
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
Indonesian Journal of Physics welcomes full research articles in the area of Sciences and Engineering from the following subject areas: Physics, Mathematics, Astronomy, Mechanical Engineering, Civil and Structural Engineering, Chemical Engineering, Electrical Engineering, Geotechnical Engineering, Engineering Science, Environmental Science, Materials Science, and Earth-Surface Processes. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 5 Documents
 1 
Search results for , issue "Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010" : 5 Documents clear
Self Potential Modeling for Investigation of Shallow Structure in Volcanic Region: a Study Case at Domas Crater, Tangkuban Parahu Volcano, West Java Wahyu Srigutomo; Alamta Singarimbun; Adhitya S. Sunarya; Prihandhanu M. Pratomo; Anggie Susilawati; Candra E. Novana; Deny Juanda Puradimaja; Eleonora Agustine
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1087.52 KB) | DOI: 10.5614/itb.ijp.2010.21.2.1

Abstract

Quantitative numerical modeling of self-potential (SP) anomaly associated with subsurface electric current density that is attributed to cross-coupling between fluid flow and electrical conductivity distributions has been conducted. The modeling scheme was applied to an area in the vicinity area of Domas crater, Tangkuban Parahu volcano in West Java. The field surveys at domas were conducted from mid-2008 until mid-2009. The main objective of this researchis to obtain a quantitative model that is possible to explain the shallow convective hydrothermal system in the eastern side of the volcano by making comparison between SP anomaly measured on the surface with theoretical anomaly resulted from modeling. Since the modeling scheme requires information on the subsurface resistivity structure, we performed measurement and interpretation of 2-D resistivity at Domas crater. The measurement of CO2 emission that is commonly associated with magmatic gas migration patterns through fracture system was also carried out on the same SP and resistivity lines. Fluid velocity vector was calculated by solving the coupled Darcy’s and energy equations involving heat transfer terms by both convection and conduction. The subsurface electric current source distribution was calculated by solving the coupled equation of velocity and potential gradients. The results show that the fluid flow patterns around Domas Crater which in addition is controlled by topographic effect; it is also influenced by thermal fluid flows through relatively high permeability zone beneath the Domas Crater.
Comparison of Triethylarsenic and Trisdimethylaminoarsenic Sources for MOCVD Growth of GaAs Ida Hamidah; Pepen Arifin
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (252.062 KB) | DOI: 10.5614/itb.ijp.2010.21.2.2

Abstract

Triethylarsine (TEAs) and trisdimethylaminoarsine (TDMAAs) have been widely used as arsenic sources for the growth of GaAs thin films. The comparison of GaAs thin films quality grown by those difference sources are the objective of this study. The method used to growth the GaAs thin films is metalorganic chemical vapor deposition (MOCVD) with trimethylgallium (TMGa) as Ga source. The GaAs thin films were carried out by varying total reactor pressure, growth temperature, and TMGa/TEAs and TMGa/TDMAAs flow rate ratio. The difference quality of GaAs thin films were limited at structure/morphology properties carried out from EDX and SEM characterization. From the characterization it can be concluded that the growth of GaAs thin films with TDMAAs source have better quality than the growth of GaAs thin films with TEAs source. The growth of GaAs thin films with TEAs and TMGa sources revealed that almost all of the grown films have certain high C concentration (around 16 %), with its non-uniform surface morphology. The high C concentration in these films is caused by the CH3 and C2H5 species presence in TMGa and TEAs, respectively, which act as a source of C impurity. The GaAs films grown using TDMAAs and TMGa sources have better characteristics compared to GaAs films grown using TEAS and TMGa sources. The films have good structural with certain low C concentration (around 3 %). The optimum growth condition of GaAs was achieved at the following conditions: the TDMAAs/TMGa flow rate ratio of 4.5, the growth temperature of 580 oC, and the total reactor pressure of 50 torr. In this conditions the grown GaAs thin film has a p-type conductivity with the mobility and the hole concentration of 395 cm2/V.s and 3.44 x 1015 cm-3, respectively, with uniform surface morphology.
Path Integral and Space-Time Transformations for Time-Dependent Hamiltonian Systems Surarit Pepore; Bodinchat Sukbot
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (75.669 KB) | DOI: 10.5614/itb.ijp.2010.21.2.3

Abstract

The exact solutions for the time-dependent Hamiltonian systems is studied by the Feynman path integral method. The quantum mechanical propagator of a harmonic oscillator with strongly pulsating mass is calculated by the Pauli-Van Vleck formula while the wave functions is derived from the spectral representation of the obtained propagator. We demonstrate that the use of a space-time transformation can simplify the evaluation of the propagator for a time-dependent linear potential. We also show that such a propagator can be obtained from the free-particle propagator in the new space-time coordinate system.
Seismogram Analysis of Earthquakes in Sumatra-Java at HYB Observatory Station Bagus Jaya Santosa
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (152.144 KB) | DOI: 10.5614/itb.ijp.2010.21.2.4

Abstract

The S wave velocity across the earth structure under Indian Ocean has been investigated through seismogram analysis in the time domain and three Cartesians components simultaneously from earthquakes occurred in Sumatra in which the data is recorded in HYB observatory station, India. The main data set are comparison between the measured and the synthetic seismograms, instead the travel time data or dispersion analysis, as commonly used by other seismologists. The synthetic seismogram is calculated with the GEMINI method using the CMT solution and the vertical isotropy of PREM earth model that is generally referred by other seismologists. The above seismogram comparison shows that the global earth mantle of PREM gives deviating synthetic seismogram and has later arrival times than those from measurement. The gradient βh in the upper mantle layers was altered to positive from its negative slope as stated in the PREM model, and positive corrections are added to the zero order of polynomials coefficients of S velocity structure in all earth mantle layers. The excellent fitting, as well as travel time and waveform, were achieved on the S wave, Love and Rayleigh surface waves, as well as the ScS and ScS core reflected waves.
Source Term Calculation of Small Pb-Bi Cooled Non-Refueling Nuclear Power Reactor 20 MWe (SPINNOR 20MWe) Imron Imron; Zaki Su’ud; Ari Darmawan Pasek
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.017 KB) | DOI: 10.5614/itb.ijp.2010.21.2.5

Abstract

Source term calculation of small Pb-Bi cooled, 15 years non-refueling nuclear reactor 20 MWe (SPINNOR 20MWe) has been performed. The study is limited on activity, toxicity, thyroid and whole body dose. The reactor has an average power density of 187 watt/cm3 with near zero postulated accident propability. The LOCA probability less than that of PWR type because of low pressure condition in the Reactor vessel. The coolant freezing in room temperature can protect nuclide from escaping. Antisipated accident by design capable to protect reactor from unprotected transient over power and unprotected loss of flow accident without scram. In hipotetik scenario accident, there is a sabotage in vessel and core melt when cooling system is lost. Core inventory factor on final cycle is 3,69E+9 Ci/MWth. Except elemental iodine and noble gas, all radionuclides were traped in containment. The source term in containmen 1,8 h after accident for Noble Gas group is 2,38E+09 Ci, Halogen group is 5,12E+08 Ci, Alkali metal group is 3,04E+08 Ci, Tellerium group is 3,99E+07 Ci, BaSr group is 6,80E+07 Ci, Noble Metal group is 2,91E+06 Ci, Lanthanide group is 1,72E+06 Ci, Cerium group is 8,12E+07 Ci. Np-237 is the longest for clearance time about 16.500 years, the most toxic is Xe-138 with α/D reach 7,38E+19. The Source term is used for estimate thyroid dose, in EPZ is 0.89 rem and in LPZ is 0.055 rem below limit constrain PWR 180 rem and 130 rem. The whole body dose in EPZ and LPZ is 0,00132 rem dan 0.000269 rem with PWR Standard 9,74 rem dan 8,54 rem. Based on acceptece criteria of PWR type, the safety requirement of SPINNOR 20MWe is achieved.

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