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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 12 No 3 (2001): Vol. 12 No.3, Juli 2001" : 5 Documents clear
Determination of Location and Size of Circular Cavity Using Nonlinear Programming Techniques Neny Kurniasih; Naoshi Nishimura; Shoichi Kobayashi
Indonesian Journal of Physics Vol 12 No 3 (2001): Vol. 12 No.3, Juli 2001
Publisher : Institut Teknologi Bandung

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Abstract

The applicability of the boundary integral equation method (BIEM) to the inverse elastodynamic problem is demonstrated. Once the forward problem is solved, the inverse one can be applied to determine some unknown physical parameters considered in the problem by minimization of the objective function in the least square sense. The size and location of circular cavity, as the unknown parameters, in a semi-infinite medium are determined, by providing the total displacement on the certain boundaries. The data of the total displacement may be obtained synthetically from the numerical analysis or observed from the experiment. Various nonlinear optimization techniques are used to determine the unknown parameters. The results have different convergence properties in achieving the optimum solution.
Analisis Neutronik Teras RSG-Gas Berbahan Bakar Silisida Tukiran S.; Tagor MS
Indonesian Journal of Physics Vol 12 No 3 (2001): Vol. 12 No.3, Juli 2001
Publisher : Institut Teknologi Bandung

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Abstract

RSG-GAS reactor has been starting to convert its fuels from original fuel, (oxide fuel U3O8Al) to uranium silicide fuel U3Si2Al with loading, density and enrichment similar to those of original fuel 250 g, 2.96 g/cm3, 19.75 %, respectively. For next future, the RSG-GAS is planning to use silicide fuel with loading, density and enrichment of 300 g, 3.55 g/cm3, 19.75 %, respectively because the higher density of silicide fuel used, the more advantages can be achieved for reactor operation. There for, it is necessary to analyze the feasibility of using silicide fuels with 300 g loading for RSG-GAS core. The kinetic and neutronic parameter were calculated by generating macroscopic cross section of 300 gr silicide fuel loading. The neutronic and kinetic parameter were calculated based on the macroscopic cross section. The macroscopic cross section calculation was done by WIMSD/4 code with 4 neutron energy group. Calculation result of macroscopic cross section was used to determine neutronic and kinetic parameter using Batan-2DIFF code. The result of analisis showed that the 300 gr sicilide fuel loading is feasible to be used in the RSG-GAS core without exceeded the safety margin.
Lattice-Gas Automata for Numerical Experimental Verification of Maxwell-Boltzmann Distribution Siti Nurul Khotimah; Idam Arif; The Houw Liong
Indonesian Journal of Physics Vol 12 No 3 (2001): Vol. 12 No.3, Juli 2001
Publisher : Institut Teknologi Bandung

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Abstract

Lattice-gas automata model has been applied to simulate the distribution function of gas molecules. This study shows a transition of a single-component velocity distribution from its initial non-equilibrium to its final equilibrium. The distribution is independent of time when the system reaches its equilibrium. For a sufficiently dilute gas in equilibrium, the distribution function of x-velocity component is a Maxwell-Boltzmann distribution with its average velocity component is between zero and 3% of its maximum value. This numerical experiment also obtained that the speed distribution for two-dimensional problem is a Maxwell-Boltzmann distribution. From 12 trials, average and root mean square speeds are (8.6±0.3) and (9.7±0.3) lattice units per time step respectively. We introduce a factor β to converse the unit of speed to be in meter per second. Therefore, the absolute temperature (in Kelvin) of the experiment is expressed in the mass of one molecule and Boltzmann constant as (47,1±3,2)β2 m/k.
Pengaruh Annealing Terhadap Tingkat Kestabilan Efisiensi Sel Surya p-i-n a-Si:H Doping Delta Amiruddin Supu; Dilla M; Jasruddin Daud Malago; Fitri Suryani Arsyad; Toto Winata; M. Barmawi
Indonesian Journal of Physics Vol 12 No 3 (2001): Vol. 12 No.3, Juli 2001
Publisher : Institut Teknologi Bandung

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Abstract

Hydrogenated amorphous silicon (a-Si:H) solar cells with δ-doped p-layer have been fabricated using double chamber Plasma Enhanced Chemical Vapor Deposition (PECVD). 10 % Silane (SiH4), diborane (B2H6) and phosphine (PH3) gases in hydrogen (H2) gas were used as gas sources. δ-Doped p-layer was deposited by using very thin boron layer as dopant source. Current (I) - voltage (V) characteristic measurement was done using xenon lamp as light source with power of 250 watts and voltage of 24 volts. The result shows that the efficiency of δ-doped p-i-n a-Si:H solar cell without annealing decreases from 5.39 % to 3.49 % as the illumination time increases from 0 hours to 2.5 hours. The stable efficiency obtained is3.6 %. It means that there is an efficiency drop of 33.15 %. Solar cell efficiency annealed at temperature of 150OC decreases from 8.59 % to 6.69 % as the illumination time increases from 0 hours to 2.5 hours. Its stable efficiency obtained is 7.11 %. It means that there is an efficiency drop of 17.23 %. Thus the annealing process decreases the efficiency drop.
Variabilitas Harian Equatorial Spread F di Atas Biak (01 oLS, 135 oBT) Buldan Muslim; Sarmoko Saroso; The Houw Liong
Indonesian Journal of Physics Vol 12 No 3 (2001): Vol. 12 No.3, Juli 2001
Publisher : Institut Teknologi Bandung

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Abstract

The occurrence of equatorial spread F (ESF) at Biak BT) 01 oLS,135 oBT during March and April has been investigated on daily basis in sunspot medium years 1992 in terms of the growth rate of irregularities by the gravitational Rayleigh-Taylor (GRT) instability mechanism which includes the gravitational and cross-field instability terms. The occurrence statistics of ESF at Biak are examined in relation to maximum of h’F after sunset, rate of h’F and fluctuation of rise as well as with solar and magnetic activity conditions. It is found that the day-to-day variation of ESF occurrence at Biak can be accounted generally for on the basis of the GRT mechanism. On the basis of March data from 1992 – 1995 occurrence of ESF decrease with decreasing solar activity.

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