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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 3 Documents
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Search results for , issue "Vol 17 No 3 (2006): Vol. 17 No. 3, July 2006" : 3 Documents clear
Source Mechanism of Monochromatic and Low-Frequency Events at Papandayan volcano, West Java, Indonesia Hetty Triastuty; Masato Iguchi; Takeshi Tameguri
Indonesian Journal of Physics Vol 17 No 3 (2006): Vol. 17 No. 3, July 2006
Publisher : Institut Teknologi Bandung

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Abstract

Monochromatic and low-frequency (LF) seismic events, which occurred in June and July 1998 at Papandayan volcano, were analyzed to make clear their source mechanisms. Monochromatic event is characterized by slowly decaying quasi-sinusoidal coda part. Spectra of monochromatic events have sharp dominant peak in frequency range of 1.4 – 1.8 Hz, while spectra of LF events have broader band (2-5 Hz) than monochromatic events. Epicenters of the monochromatic and LF events are located at the main crater, Mas crater. Focal depths of monochromatic events range 1.5 to 2.0 km, while the depths of LF events are deeper, 2.5 to 4.0 km. Moment acceleration tensors were obtained by inversion of amplitudes distribution of P-wave first motions. Double-couple parts are dominant in both monochromatic and LF events. Fault plane solutions are normal fault types, and the strikes of nodal planes coincide with the directions of geological faults around Mas crater. Isotropic and CLVD parts are not negligible in LF events. Monochromatic and LF events are related to hydrothermal system, because both monochromatic and LF events occurred beneath Mas crater and activation of fumarolic gas emission was observed when seismicity of these events increased. LF events could be generated by normal fault fracturing accompanying fluid movement. Similarities of initial parts of LF to monochromatic events in spectra and source mechanisms suggest that LF events are triggers of quasi-sinusoidal coda parts of monochromatic events.
An Improved Analytic Method Based on Airy Functions Approach to Calculate Electron Direct Transmittance in Anisotropic Heterostructure with Bias Voltage Lilik Hasanah; Khairurrijal Khairurrijal; Mikrajuddin Abdullah; Toto Winata; Sukirno Sukirno
Indonesian Journal of Physics Vol 17 No 3 (2006): Vol. 17 No. 3, July 2006
Publisher : Institut Teknologi Bandung

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Abstract

An analytic expression of transmittance based on the Airy wavefunctions approach has been derived for an electron through an anisotropic heterostructure with an applied voltage to the barrier of the heterostructure. The Si(110)|Si0.5Ge0.5|Si(110) heterostructure was used to examine the analytic expression. In order to evaluate the Airy wavefunctions approach, the transfer matrix method, which is a method widely applied for various applications, was employed as a reference. It was found that the transmittance calculated by the Airy wavefunctions approach fits perfectly that obtained by the transfer matrix method. The exponential wavefunctions approach in obtaining the transmittance was also evaluated. The transmittance obtained by the exponential wavefunctions is always lower than the transfer matrix method-based transmittance. As the electron total energy or applied voltage increases, the difference between the exponential wavefunctions- and transfer matrix method-based transmittances increases. Thus, the Airy wavefunctions approach improves the exponential wavefunctions approach to calculate the electron direct transmittance.
A Method for Beam Positions Determination in Image Reconstruction Rena Widita
Indonesian Journal of Physics Vol 17 No 3 (2006): Vol. 17 No. 3, July 2006
Publisher : Institut Teknologi Bandung

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Abstract

From one treatment to the next, considerable effort is made to accurately position the patient consistent with the plan, but some variation is unavoidable. The target volume and the organ at risks may move within the patient and/or change shape during the treatment. Thus, it is important to be able to verify the success of the treatment by determining the position of patient and the dose deposited in the patient at each fraction. One possibility to achieve this would be to obtain an image while the patient is on the treatment couch. The aim of this study was to develop a method for determining beam positions to use to reconstruct an image for dose verification by collecting limited information while the patient is on the treatment couch. Two methods, image correlation and projection correlation, were developed and compared here. The effectiveness and practicality of each of these methods were compared. The results show that the projection correlation presents several advantages. It can be applied without any iterations, and it produces a fast algorithm. With more advanced image reconstruction software, this method could potentially be used in a clinical environment.

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