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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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Performance Analysis of 2D and 3D Fluid Flow Modelling Using Lattice Boltzmann Method Fourier Dzar Eljabbar Latief; Umar Fauzi
Indonesian Journal of Physics Vol 18 No 2 (2007): Vol. 18 No. 2 April 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (491.696 KB) | DOI: 10.5614/itb.ijp.2007.18.2.2

Abstract

Several studies have been conducted to observe properties of fluid flow in materials using the Lattice Boltzman Method (LBM). There are two widely used lattice model, the D2Q9 for the 2D simulation, and the D3Q19 for the 3D simulation. Our particular interest is to study the velocity map both using the 2D and the 3D simulation, using the same object. The aim of this study is to evaluate effectiveness and efficiency of both methods. In our simulation, the velocity profile between the 2D and 3D models differs greatly (mean error 30.4%) if the object has complex lateral structure (the shape along the z-axes differs greatly), while for the less complex object, the profile has only 1.4% of mean error. The computing time for the 3D model took 13 times longer than the simulation of the 2D model. The result from the comparison of both methods concludes that the simplification of fluid flow simulation of 3D objects into 2D objects should be taken carefully, for in some cases, the simplification is not quite appropriate.
Corrosion Study of Steels In Liquid Lead-Bismuth Cooled Nuclear Reactors by Computer Simulation using Moldy Code Alan Maulana; Zaki Su'ud; Hermawan K. Dipojono; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 18 No 2 (2007): Vol. 18 No. 2 April 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.065 KB) | DOI: 10.5614/itb.ijp.2007.18.2.3

Abstract

The corrosion of steel in liquid lead-bismuth has been studied by computer simulation using MOLDY code. The diffusion processes among atoms are assumed to be the key issues to understand the corrosion mechanism microscopically. In order to simulate these diffusion processes, the inter-atomic potential between Fe-Fe, Pb-Pb, Bi-Bi, Cr-Cr and Ni-Ni are assumed to obey the Lennard-Jones potential. The Lennard-Jones potential parameters of above pairs of atom have been derived by fitting the data available in the literature with the Lennard-Jones equation. The initial positions of the system are taken from the crystal structures data including the cell parameters. The simulation cell was a box with the volume 60x30x30 Å3 that were filled by 2864 atoms. Nickel and chromium atoms were substituted into Fe crystal with the percentage 10% and 16 % respectively to construct the systems of SS-316 which contacted by 50%Pb-50%Bi. The molecular dynamic simulations have been carried out for surface interaction between steel crystal with liquid lead-bismuth for several temperatures. After done the above simulation, the simulation is then tried by using 45%Pb-55%Bi (Pb-Bi Eutectic). The results of molecular dynamic simulations for several temperatures and the effect of variation of Pb and Bi above will be presented in this paper.
Feasibility Study of Integrating Absorption Heat Pump into Methanol Steam Reforming Process for Hydrogen Production Willy Yanto Wijaya; Ken Okazaki; Kazuyoshi Fushinobu; Abdul Waris
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (225.085 KB)

Abstract

Theoretically, Methanol Steam Reforming (MSR) process to produce hydrogen only requires endothermic heat with temperature lower than 100°C. Meanwhile, waste heat in the temperature level of 100-150°C is disposed in huge amount by various industrial sectors every year. If this abundant waste heat can be recovered and stored into hydrogen energy through the MSR, a potential gain and high-efficient energy system could be achieved. However, empirically, temperature level ≥ 200°C is required for the MSR process to have high conversion from the methanol to hydrogen. Therefore, Absorption Heat Pump (AHP) system is then utilized to enhance the temperature level of the waste heat. Nevertheless, AHP system certainly requires additional input energy. This research was to investigate the feasibility of integrating the AHP system into MSR process to produce hydrogen. Further consideration on hydrogen to electricity conversion using Fuel Cell (FC) would also be provided. The feasibility study was conducted through the efficiency calculations, either for energy or exergy terms, for several theoretical as well as actual-approximation cases.
The New Fugacity Calculation in Finite Nuclear Matter Rizal Kurniadi; Abdul Waris
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (102.552 KB)

Abstract

The caloric curve of hot nuclei in equilibrium states have been calculated with a new prescription namely a new fugacity calculation. In this technique, the fugacity is directly proportional to the nucleon density; hence, the fugacity is obtained through thermal wavelength. In contrast with the constant fugacity, the choosing of thermal wavelength approximation gives a simpler way to calculate the density profile and the entropy of finite nuclear matter. Variation of thermal wavelength value does not affect to the density and entropy. The phase transition temperature is dependent concerning both of the thermal wavelength value and the potential deep.
Microstructure Characterization of Pigeon Hole Rock Models at Different Scale: A Preliminary Study Umar Fauzi
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (161.618 KB)

Abstract

Microstructure of rocks determines physical properties of rocks at different scale, i.e.: from micro to giga scales. Study on microstructure characterization of rock models at different scale is conducted in this research. Rock models are generated using fractal pigeon hole models at zero level. Substructure ratio selected in this study is 22 with quotient of self-similarity equals to 0.25. Porosity of created models varies from 4 to 20%. Physical parameters, i.e.: porosity, specific surface area and two point correlation functions as well as hydraulic radius distribution, are evaluated for different pixel length. Physical parameters at small scales tend to have large deviation. The deviation decreases as the pixel length increases and tends to a similar value or trend at a specific length. This study shows that some characteristic lengths are available at several rock models.
The Influence of Ferromagnetic core, Pick-up Coil Winding Number and Environmental Temperature to the Output Signal of a Fluxgate Magnetic Sensor Yulkifli Yulkifli; Rahmondia N. S; Mitra Djamal; Khairurrijal Khairurrijal; Deddy Kurniadi
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (155.91 KB)

Abstract

The paper explains some influence parameters of a fluxgate magnetic sensor e.g. number of ferromagnetic cores, number of pick-up coil winding and temperature. The sensors were built in three configurations of pick-up coil winding: 50x2, 60x2, and 70x2 turns, where the excitation coil was kept unchanged at 40x2 turns. The influence of ferromagnetic core and temperature were tested by using the configuration of 60x2 turns. The measurement results show that the increasing of core layer increases the measurement range: ± 100 µT (2 layers), ± 150 µT (6 layers) and ± 200 µT (10 layers). The increasing of pick-up coil winding number increases the sensor sensitivity: 260.64 mV/µT (40/50/40), 321.39 mV/µT (40/60/40) and 383.43 mV/µT (40/70/40). The increasing of temperature shifted the output signal to the higher position
Robust M-Estimation of CSAMT Impedance Functions Doddy Sutarno; Ibnu Fatrio
Indonesian Journal of Physics Vol 18 No 3 (2007): Vol. 18 No. 3 July 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (269.982 KB)

Abstract

Accurate estimation of impedance functions is essential for the correct interpretation of Controlled Source Audio Magnetotelluric (CSAMT) measurements. Noise is inevitably encountered when CSAMT observations are conducted and, consequently, impedance estimates are usually based on least-squares (LS) approximation. Least squares ultimately assume simple Gaussian statistics. However, estimation procedure based on LS would not be statistically optimal, as outliers (abnormal data) are frequently superimposed on a normal ambient CSAMT noise field, which is approximately Gaussian. In this situation, the estimation can be seriously misleading. It is then essential to use statistical procedures that are robust in the sense of being resistant or insensitive to the presence of the outliers. This paper proposes an alternative CSAMT estimation procedure based on M-estimators that is robust and efficient in nature. Like the LS estimate, the M-estimate minimizes the difference between prediction and observation, but differs from the LS estimate in that it defines the measure of misfit in a way that does not allow a few bad points to dominate the estimate. Starting with the description of this estimate, several algorithms for computation are discussed and applied to estimate CSAMT impedance. Using noisy synthetic data, it is shown that the proposed method can produce usable CSAMT impedance functions even under condition of severe noise contamination.
Challenges in the Measurement of LUSI’s Physical Properties Hamdi Rifai; Satria Bijaksana; Umar Fauzi; Bagus E. B. Nurhandoko
Indonesian Journal of Physics Vol 18 No 4 (2007): Vol. 18 No. 4, October 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (622.565 KB)

Abstract

An extraordinary mud volcano, commonly referred to as LUSI or Lumpur (mud) Sidoarjo, erupted in May of 2006 in Sidoarjo, East Java. Since then, LUSI has claimed approximately 700 hectares of rice fields, factories, villages and other infrastructures. A bold attempt to reduce the volume of mud by inserting sets of high density chained balls (HDCB) has been tried by a team of scientists and engineers from Bandung Institute of Technology. This effort requires, among others, measurement of LUSI’s physical properties (temperature, density, water content, viscosity, magnetic susceptibility, etc.) as a part of its evaluation and monitoring system. We will describe how this challenging task was performed. The environment in which the samples were obtained is harsh as the in situ temperature of the mud is about 90 degree centigrade, the ground in unstable, and the presence of water vapor with high content of H2S. In general, mud samples were collected on daily basis during the HDCB insertion. The results of these measurements of physical properties are valuable in assessing the effectiveness of the HDCB operation.
Thorium Fuel Cycle in BWR with Free 233U Abdul Waris; W. Nawangsary; Syeilendra Pramuditya; Rizal Kurniadi
Indonesian Journal of Physics Vol 18 No 4 (2007): Vol. 18 No. 4, October 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (103.13 KB)

Abstract

Study on thorium fuel cycle with free 233U in boiling water reactor (BWR) has been carried out. In this study we have utilized plutonium and minor actinides (MA) as fissile nuclides instead of 233U as one of the main scenario to obtain the 233U free BWR core with thorium. Beside that, the void-fraction of the reactor is modified from 20% up to 70%. The results show that the standard BWR core can maintain its criticality when the loaded fuel is thorium with 11.16% and 1.24 % of plutonium and MA, respectively. The use of 11.16% of Pu and 1.24 % of MA is more than enough to substitute the 1% of 233U to obtain thorium fuel cycle in the standard BWR with free 233U. Moreover, the lesser amount of plutonium and minor actinides in the fuel will results in the great degradation on the safety of reactor
Electron Transmittance through a Heterostructure on Anisotropic Materials using the Airy Function and the Transfer Matrix Method Lilik Hasanah; Adi Bagus Suryamas; Khairurrijal Khairurrijal; Mikrajuddin Abdullah; Toto Winata; Sukirno Sukirno
Indonesian Journal of Physics Vol 18 No 4 (2007): Vol. 18 No. 4, October 2007
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.701 KB)

Abstract

Derivation of the transmittance of an electron incident on a heterostructure potential with nanometer-thick trapezoidal barrier grown on anisotropic materials is done by solving the effective-mass equation including off-diagonal effective-mass tensor elements. The analytic expressions are applied to the Si(110)/Si0.5Ge0.5/Si(110) heterostructure. It is assumed that the direction of propagation of the electrons makes an arbitrary angle with respect to the interfaces of the heterostructure and the effective mass of the electron is position dependent. The calculation of transmittances is done for incident energy at z direction below and above the barrier height by varying the applied voltage to the barrier. The maximum transmittance depends on the incident energy and the bias voltage given to the potential barrier. The transmittance value obtained from the Airy function has the same value obtained from the transfer matrix method. It was also found that the transmittance depends on the valley and it is not symmetric with the incident angle.

Page 16 of 34 | Total Record : 334

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