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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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Design and Development Fluxgate Magnetometer and Its Applications Mitra Djamal
Indonesian Journal of Physics Vol 17 No 1 (2006): Vol. 17 No. 1, January 2006
Publisher : Institut Teknologi Bandung

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Abstract

The paper explains design, development, and applications of fluxgate magnetometer, which is based on second harmonic Fourier component. The probe has a probe core of highly saturable material and at least two coils, a premagnetization coil and a pick-up coil. They are used to measure an external magnetic DC or low-frequency AC field, Bext. The probe is driven periodically into saturation by a sinusoidal current that flows through the premagnetization coil. It can be shown that the amplitude of the second harmonic frequency component will be measured by external magnetic field. The developed magnetometer can measure magnetic field with sensitivity 400mV/µT and relative error < 1.2 %. Some applications of the fluxgate magnetometer, e.g. non-contact current and displacement measurements have been developed and tested. It can be shown that the developed sensor can measure electric current until 1.9 A with relative error <5% and displacement in the range of 15 until 20 mm, with relative error <0.7%.
Sub-band States in a Nanometer Width Silicon Accumulation Layer/ Vacuum Structure Obtained from Self-Consistent Solution of the Coupled Schrödinger-Poisson Equation Adi Bagus Suryamas; Mikrajuddin Mikrajuddin; Yudi Darma; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 17 No 1 (2006): Vol. 17 No. 1, January 2006
Publisher : Institut Teknologi Bandung

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Abstract

A vacuum microelectronic device based on an n-type Si(100)-vacuum structure was theoretically studied. A nanometer width accumulation layer in the Si(100) region is created when a negative voltage is applied to the Si(100). The potential profile of the structure was obtained from solving self-consistently the coupled Schrödinger-Poisson equation with inclusion of the space charge and quantum effects. The finite difference method was employed in the self-consistent solution. It was found that the quantum well in the Si(100) region is deep and narrow with a small bump, which could cause resonant tunneling phenomena in the vacuum device. Three lowest sub-band states, which are composed of two states in the lower valley and one in the higher valley, exist in the quantum well. The sub-band energy levels increase with increasing the external electric field. The lowest energy level of each valley become lower than the Fermi energy as the electric field is higher than 50 MV/cm. Most electrons occupy the lowest state of each valley. The occupancy of the lowest state of the lower valley is lower than that of the lowest state of the higher valley because the degeneracy and density of states mass of the state of the higher valley are higher than those of the state of the lower valley. The lifetimes of all states decrease exponentially as the external electric field is increased. As the electric field becomes higher than 30 MV/cm, the lifetime is less than 100 s. Therefore, electrons have probability of escaping the vacuum barrier via tunneling process.
Simulation of Carbon Nanotube on-tube Metal-Semiconductor Heterojunction Electronic Properties Satria Zulkarnaen Bisri; Lilik Hasanah; Adi Bagus Suryamas; Sukirno Sukirno
Indonesian Journal of Physics Vol 17 No 1 (2006): Vol. 17 No. 1, January 2006
Publisher : Institut Teknologi Bandung

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Abstract

It has been modeled a carbon nanotubes (CNT)-based electronic device, which is a metal-semiconductor heterojunction that purely constructed from finite length of two different carbon nanotubes. It is possible since CNT possesses uniqueness in its electronic properties that it could be metallic material or semiconductor material, depends on its chirality. The modeled device is constructed from two CNTs, which possess difference in their chirality that also make differences in their electronic properties, and connected coaxially. It has been selected CNT (10,10) as metallic CNT and pyridine-like-N-doped CNT (17,0) as semiconductor CNT in order to minimize the tapering zone between them where they are connected coaxially. It has been calculated the charge distribution as well as the potential profile of the heterojunction. The calculation was done by using self-consistent method between those two parameters, in order to solve non-homogeneous Poisson’s equation. It was performed with the aid of universal density of states for CNT to calculate its charge distribution. The electron tunneling transmission coefficient, for low energy region, also has been calculated by using Wentzel-Kramer-Brillouin (WKB) approximation. From the calculation results, it is obtained that the charge distribution as well as the potential profile of this device is doping fraction dependent. It is also inferred that the WKB method is fail to be used to calculate whole of the electron tunneling coefficient in this system. It is expected that further calculation for electron tunneling coefficient in higher energy region as well as current-voltage characteristic of this system will become an interesting issue for this carbon nanotube based electronic device.
Spin Dependent Tunneling through a Nanometer-thick Square Barrier Based on Zinc-blende Structure Material Adi Bagus Suryamas; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 17 No 2 (2006): Vol. 17 No. 2, April 2006
Publisher : Institut Teknologi Bandung

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Abstract

Spin dependent tunneling through a nanometer thick square barrier based on zinc- blende structure material has a great deal of attention due to its potential application in spintronics devices. An analytic expression of the transmittance T of an electron with spin polarization has been derived by adding the Dresselhauss term to the commonly used Hamiltonian and solving the Schrödinger equation. Solutions of the Schrödinger equation give two states referred as the “up” or “+” and “down or “-” spin states. It was found that the “up” and the “down” state transmittances are asymmetric to the axis at the normal incidence (θ=0o). Moreover, at the normal incidence the transmittances are equal because the parallel wave vectors are zero and not the highest. In addition, it was also found the relation T+(θ)= T-(-θ) due to the anisotropic properties of heterostructure materials.
Quantitative Analysis of Self-Potential Anomaly: Derivative Analysis, Least-Squares Method and Non-Linear Inversion Wahyu Srigutomo; Eleonora Agustine; M. Habri Zen
Indonesian Journal of Physics Vol 17 No 2 (2006): Vol. 17 No. 2, April 2006
Publisher : Institut Teknologi Bandung

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Abstract

Despite the broadly usage in geophysical fields due to its non-intrusiveness, inexpensiveness and fast deployment, self-potential (SP) method still posses challenges in the interpretation. In this work, quantitative identification of SP parameters such as the shape factor of cylindrical and spherical objects, the depth of burial, the polarization angle and the electric dipole moment is addressed. Three approaches of quantitative interpretation are used, i.e., a derivative method, a least-squares method and an iterative inversion based on the Levenberg-Marquardt method. The above approaches were first tested on a theoretical synthetic model, where a close agreement between the presumed and calculated parameters was obtained. Application to the real data was conducted by analyzing the SP anomaly obtained from a buried cylindrical conductive object at certain depth.
Spectral Analysis of Surface Waves (SASW) Measurement For Soil Characterization Gunawan Handayani
Indonesian Journal of Physics Vol 17 No 2 (2006): Vol. 17 No. 2, April 2006
Publisher : Institut Teknologi Bandung

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Abstract

In geotechnical engineering and earthquake engineering, the information of seismic shear wave velocity profile of the subsurface is vital in assessing the strength of soil layers, estimating the ground shaking during earthquake and liquefaction potential of the soil layers. Conventional method in determining the shear wave velocity profile is conducting seismic down hole or cross hole which requires drilling some boreholes. Recent popular method is to carry out surface wave survey that does not require any boreholes. This paper reports the results of one of surface wave method i.e. the Spectral Analysis of Surface Wave (SASW) for soil characterization in Banda Aceh. The field procedure and data processing including the phase unwrapping process which is very important to obtain an accurate field dispersion curve are discussed. The results of the survey in terms of shear wave profile are used in predicting the ground shaking during earthquake.
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.
Diffuse X-ray Scattering from NaCl K. Basar; Xianglian Xianglian; T. Sakuma
Indonesian Journal of Physics Vol 17 No 4 (2006): Vol. 17 No. 4, October 2006
Publisher : Institut Teknologi Bandung

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Abstract

The diffuse X-ray scattering intensities from ionic crystal NaCl at 22 K and 290 K have been measured using Cu-Kα radiation. The temperature dependence of the oscillatory diffuse scattering has been observed. The oscillatory diffuse scattering from NaCl is explained by the correlation effect between the thermal displacements of atoms up to 2nd nearest neighboring atoms in the crystal of NaCl.

Page 14 of 34 | Total Record : 334

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