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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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Penentuan Kekerasan dan Struktur Mikro Sambungan Las Baja Karbon Rendah Akibat Perlakuan Las Titik Edison Sihombing
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Research on the effect of spot welding parameters on hardness and microstructure of low carbon steel weld joints has been done. The research was focused on determining the combination of welding parameters to get the best welding result. In this research, the thickness of plate used are: 1 mm and 3 mm. For the plate thickness of 1 mm, the currents applied are 2 kA, 4 kA, 6 kA, 8 kA, and 10 kA, electrode forces are 2 kN, 2.4 kN, 2.8 kN, 3.2 kN, and 3.6 kN and welding times are 20 seconds, 30 seconds, 40 seconds, 35 seconds, 40 seconds, and 45 seconds. For the plate thickness of 3 mm, the currents applied are 8 kA, 9 kA, 10 kA, 11 kA, and 12 kA, electrode forces are 2 kN, 2.4 kN, 2.8 kN, 3.2, kN and 3.6 kN and welding times are 20 seconds, 30 seconds, 40 seconds, 50 seconds, and 57 seconds. Tests of mechanical properties performed include hardness using the Vickers method, weld shear strength using stretching test whereas metallurgical test was performed using optical microscope. Welding process shows no weld joint for the plate thickness of 1 mm, if the current is less than 4 kA. If the current is less than 8 kA there is no weld joint for the plate thickness of 3 mm. Hardness test results showed that the higher the current, welding time, and electrode force, the harder the metal. This phenomenon occurs since higher welding variables can cause recrystallization and change the phase of metal that heighten the hardness of metal. Microstructure test results showed that the material contains ferrite, pearlite, and martensite. As a final result it can be concluded that for 1 mm plate the best combination of variables is 6 kA of current, 30 seconds of welding time and 2 kN of electrode force, and for 3 mm plate is 10 kA of current, 20 seconds of welding time, and 3.6 kN of electrode force.
Studi Efek Bentuk Butiran Ukuran Bervariasi Terhadap Sifat Kemagnetan Magnet Permanen D. Tarihoran; A. Manaf
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Stoner-Wohlfarth (SW) theory shows a deviation of around 30-40% compared to measurement results of a permanent magnetic material with nanometer-sized grains. This is because this theory neglects the interacting grain factor. This research modifies the SW theory by calculating the grain interacting effect. The modification is made by assuming theinteracting energy of a single domain ellipsoidal grain is focused at the edge of the grain. The SW grain in this calculationis modeled as a box in the ellipsoid. The result shows that the interacting effect increases remanent polarization drasticallyand decreases the coercive field value when grain size reaches 20% of the unitial single domain grain (~100 nm). For material with Nd2Fe14B phase, the optimum coercive field value and remanent polarization that produce maximum energy product (BH)max occurs in a material with ~5 nanometer-size grains. There is an appropriate qualitative result between the calculation and measurement.
Temperature Dependent X-ray Powder Diffraction Study of Pb2,5Sb1,5O6,75 Ismunandar Ismunandar; Yoni Budiman
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

It has been reported that Pb2,5Sb1,5O6,75 adopts an ideal pyrochlore structure at room temperature and transforms to a weberite structure at high temperature. In order to study the structure transformation, structures of Pb2,5Sb1,5O6,75 as afunction of temperature (25°C < T < 950 °C) have been studied using in-situ diffraction techniques. The structures were determined from X-ray powder diffraction data using the Rietveld analysis. No structural phase transitions were observed in the range 25°C to 750°C, so the structure of Pb2,5Sb1,5O6,75 was concluded to be an ideal pyrochlore structure. The cubic lattice parameter increases linearly from a = 10,6924(5) Å to 10,7521(10) Å. Diffraction patterns above 850°C can be indexed in a related orthorhombic structure indicating n possible weberite structure. Thermal analysis using DTA & TGA of Pb2,5Sb1,5O6,75 showed that the change at 850oC were accompanied by a weight loss. From the weight loss, it can be concluded that the orthorhombic phase has the composition of Pb2Sb2O6.
Karakteristik Model Batere Sekunder Menggunakan Elektroda PANI-NMP S. Hidayat; M. O. Tjia
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Polyaniline that was plasticized with n-methyl pirrolidinone (PANI-NMP) was investigated as secondary battery electrode. The study was conducted on two model batteries having a configuration of [stainless steel⏐ PANI-NMP⏐ LiClO4 + PEO + acetonitril ⏐ Li-Al] and [stainless steel⏐ PANI-NMP⏐ LiClO4 + PEO +⏐Li-Al] respectively. The working voltage of each battery system were found to vary respectively from 1,65 volt to 3 volt and from 1,5 volt to 3 volt. The Coulombic efficiency of the first model is 78,3% related to the optional charge capacity of 10,4 Ah/kg, while that of the second model only attains a value of 60% related to the optional charge capacity of 5,2 Ah/kg. Coulombic efficiency of the battery decreases respectively from 80,6% to 47,8% and from 72,2% to 65,6 after 20 cycles of recharging.
Structural Properties of the Quaternary Alloy CuIn(SxSe1-x)2 Awitdrus Awitdrus; Yanuar Yanuar
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

In this paper we report the structural characterization of the quaternary alloy CuIn(SxSe1-x)2 grown by the horizontal Bridgman method. It is found that the CuIn(SxSe1-x)2 crystals have a chalcopyrite structure. With increasing x, lattice constants decrease following Vegard’s law.
Pengaruh Waktu Penahanan Artificial Aging Terhadap Sifat Mekanis dan Struktur Mikro Coran Paduan Al-7%Si Subowo Subowo; Hari Subiyanto
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Holding time conducted at specified temperature determines precipitation hardening and affect mechanical properties of Al-Si alloy. The duration of holding time produces different mechanical properties, and this research examines the most suitable holding time to produce the best mechanical properties. In this research, the experiment is done using Al-Si Alloy with heat solution treatment at 520 0C, and then further quenched to artificial aging temperature of 154 0C with holding time 1, 3, 5, 7 hours. This result will be compared to Al-Si Alloy one day quenched at temperature of 30 0C without artificial aging. After the experiment, tensile test, hardness test and micro structural test were conducted. The experiment results show that increasing holding time from 5 hours until 7 hours enhances strength of material test drastically but its strain decreases.
Dosimetri In-Vivo Pada Pasien Kanker Payudara dan Nasofaring Nasukha Nasukha; Suseno MS; Santoso Santoso; Jumadi Jumadi
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

The need of high accuracy in the use of ionizing radiation for cancer treatment called radiotherapy important. Accuracy in radiotherapy dosimetry depends on dosimetry steps. In-vivo dosimetry is a tool to detect accuracy on radiotherapy dosimetry. In-vivo dosimetry for breast and nasopharynx cancers has been done with diode dosimeters in Co-60 teletherapy. For 6 diode detectors the response fluctuated less than 1,3 % with calibration factors between 0.946 to 1.018. It was found that a mean deviation of -8.76 % or underdose occurred between calculation and measurement, for 17 patients for 140 radiation fields of breast and nasopharynx cancer. This result was higher for patients with breast cancer treatment only, which is -12.28 %. For patients with nasopharynx cancer treatment only difference was -6.88 %. The difficulty of treatment techniques on breast cancer was a factor that caused the deviation.
Modifikasi Metode Full Wave di Sekitar Titik Singular Titiek Setiawati
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Modification of the full wave method is carried out for solving the electromagnetic wave equation in the vicinity of a singular point which is caused by a resonance effect. It is assumed that an inhomogeneous plasma medium is stratified horizontally. Modification towards the transition matrix in the vicinity of the singular point, by using an exponential function and Picard integration is needed for obtaining a unique (convergent) solution. The solution in the form of the electromagnetic field at the top layer can be represented as a multiplication of a number of the transition matrices with the electromagnetic field at the bottom layer.
Korelasi Antara Outgoing Longwave Radiation (OLR) dan Total Precipitable Water (TPW) di Wilayah Indonesia Periode 1996 - 1999 Juniarti Visa; Iis Sofiati; Teguh Harjana
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

Analysis of four years (1996-1999) of the monthly mean of outgoing longwave radiation (OLR) and total precipitable water (TPW) obtained from satellite NOAA 12, 14 data over Indonesia, was done with the software TeraScan Vers.2.6 and a 2.0° × 2.5° grid. From the results, the value of OLR of Indonesia is about (220 - 340) W/m2 and TPW about (40 - 60) mm. It was found that OLR and TPW are negatively correlated. South of the Equator the value is higher (-0.8), and we suspect that this condition is influenced by the North Australia Indonesia-Monsoon. At the North West of Indonesia the correlation coefficient is lowest (- 0.4), and we suspect this condition is influenced by the South East Asia Monsoon.
Relasi Dispersi dalam Pandu Gelombang Planar Nonlinear Kerr Hengki Tasman; Edy Soewono
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

In this paper planar waveguides with Kerr-type nonlinearity are considered. By using an effective refractive index method and averaging, an implicit dispersion relation is obtained analitically for the waveguides. This dispersion relation can simplify numerical calculation in obtaining dispersion curves. Dispersion relation curves with different averaging schemes for symmetric planar waveguides are shown here.

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