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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 334 Documents
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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.
Identitas Nielsen Triyanta Triyanta; Sutisna Sutisna
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

The gauge dependence of the effective action Γ that has been known for quite a long time is shown by a differential equation called the Nielsen identity. The identities appear in quantum field theory as due to the invariance of the Lagrange density with respect to the extended BRST transformations. In this paper the identities, both for the case of QED and QCD, will be derived in some gauge choices, first by following a method found in the references and second by a proposed method.
Efek Annealing Pada Penumbuhan Film Tipis Ferroelektrik PbZr0,625Ti0,375O3 (PZT) Ngurah Ayu Ketut Umiati; Irzaman Irzaman; Maman Budiman; M. Barmawi
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

Ferroelectric materials have many advantages including microactuator (piezoelectric properties), Dynamic Random Access Memory, DRAM (permitivity and polarisability) and infrared sensor (pyroelectric properties). PbZr1-xTixO3 (PZT) is ferroelectric materials, that can be piezoelectric and pyroelectric materials. In this experiment, annealing effect on growing process of thin films PbZr1-xTixO3 (PZT) using dc unbalanced magnetron sputtering is studies. PZT thin films were deposited at temperature 550oC – 650oC on Si (100) substrate with annealing condition and without annealing condition. Ratio of gas flow Ar/O2 was 50 sccm : 10 sccm, basic pressure was 0.051 Torr, and deposition pressure was 1.3 Torr. Annealing temperature was 650oC at pressure 0.58 Torr. The XRD results showed that annealing process caused crystal orientation of thin films more oddered. Some orientations that appear in the results without annealing process disappear after annealing process. This can also be seen in the morphological form of grain size PZT obtained from SEM characterization.
Studi Struktur Kristal Film Tipis Galliumantimony yang Ditumbuhkan dengan MOCVD Reaktor Vertikal Zulirfan Zulirfan; Euis Sustini; Maman Budiman
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

GaSb thin films have been grown by using vertical reactor MOCVD on (100) SI-GaAs substrates. TMGa and TDMASb were used as a precursor of group III and V respectively, with H2 as gas carrier. Films were grown at the growth temperatures 5200C and 540 oC as a function of V/III ratio. The range of V/III ratio were 0,4 - 3,1. The ex-situ characterization, XRD and SEM were used to examine the crystal structure and the morphology of the films, respectively. EDS characterization were used to find the composition of Ga and Sb atoms in the films. The increased of V/III ratio were found to have a significant effect on the both properties. Film grown at the lowest V/III ratio (0,4) shows a polycrystal structure with several peaks of GaSb crystal’s orientation, and bad surface morphology. Films grown at V/III ratio ranged about 1.0 to 3.1 show the same crystal’s orientation of GaSb, of (200) and (400). The better surface morphology were found at the growth temperature 540 oC with V/III ratio 2,0.
EPR Analysis on Radiation Dosimetry Material Spectra AuthorFrida U. Ermawati
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

Radiation dosimetry work on L-α-alanine based on EPR analysis is carried out to identify radicals induced by irradiation in the system. A Varian E-12 EPR spectrometer with a rectangular parallelepiped microwave cavity to produce TE102 mode was utilized to measure first derivative absorption lines of X-band CW spectra of γ-irradiated L-α-alanine single crystals at room temperature. Six different resonance spectra measured from a number of defined crystal orientations to the magnetic field were obtained. The dominating feature of the spectrum along the <c> is a quintet with the intensity ratio close to 1:4:6:4:1. Along the <a> and <b>, the quintet is split into a quartet of line pairs with the intensity ratio 1:1:3:3:3:3:1:1 , accompanied by weaker resonance features. When the magnetic field is fixed on crystal planes, however, the spectrum is of superposition of two different spectra. Crystallographic and computed spectral simulation studies on the system clarified these analyses.
Inversi Kuadrat Terkecil Dari Turunan Horizontal Pertama (THP) Anomali Gaya Berat Residual Rata-Rata Berjalan Untuk Menafsirkan Parameter-Parameter Sesar di Segmen Kerinci Ahmad Fauzi Fauzi; Badrul M. Kemal; W.G.A. Kadir
Indonesian Journal of Physics Vol 12 No 4 (2001): Vol. 12 No.4, Oktober 2001
Publisher : Institut Teknologi Bandung

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Abstract

A quantitative interpretation using a least-squares inverse based on the analytical expression from the first horizontal derivative (FHD) of moving average residual gravity anomalies is used to find depth and thickness of the fault. The problem of the depth determination has been transformed into the problem of finding a solution of a non-linear equation of the form f (z)=0. As a case study, this inverse is applied to carry out the fault parameters in the Kerinci segment. Two lines of gravity survey were carried out along and cross the Sumatra Fault System (SFS). The gravity anomaly pattern reflected a fault structure at northwest Sungaipenuh area in line along SFS and two-fault structure at western and eastern Sungaipenuh area in line cross SFS. The central depth and thickness of fault as a result inverse are 2.533 km and 0.815 km; 1.113 km and 1.985 km; 2.318 km and 4.195 km, respectively, for faults at northwestern, western and eastern Sungaipenuh area. The density contras is assumed - 0,43 g/cm3. Surface layer, basement and the layer faulted are reconstructed with density 2.22 g/cm3, 2.75 g/cm3 and 2.32 g/cm3, respectively. These results inverse agree with 2.5D forward model.

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