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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 7 Documents
 1 
Search results for , issue "Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003" : 7 Documents clear
Pemodelan dan Simulasi Arus Terobosan dalam Devais MOS Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

1.5-2.0 nm thick gate oxides are required for the future metal-oxide-semiconductor field-effect transistors (MOSFETs) with 100-nm gate length. An accurate model is needed to predict the tunneling current through thinner gate oxides for the development of the transistor with the gate length less than 100 nm. The tunneling current is calculated on the basis of Harrison’s approach with the conditions that both sides of the oxide layer of he transistor have sharp interfaces and the BenDaniel-Duke effective mass approximation holds. Using the nonparabolic energy-momentum dispersion relation of he band gap of the gate oxide, the tuneling current through the gate oxide with thickness of 1.65-3.90 nm can be reproduced well by the model.
Modeling of Temperature Dependence of Current in Metal-Oxide-SemiconductorCapacitors after Quasi Breakdown Fatimah A. Noor; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

A simple model of temperature dependence of current in MOS capacitors after quasi breakdown was obtained. In developing the simple model, it was assumed that electron traps are created in the oxide layer during high electric field injection of electrons. Further assumptions were that transport of electrons from one trap to another occurs due to an activated process of motion and the traps have an exponential distribution in energy. The results calculated using the model fit well the measured data.
Deposition of NiFeCo Thin Film for Giant Magnetoresistance (GMR) Material by dc-Unbalanced Magnetron Sputtering Method Togar Saragi; Mitra Djamal; Khairurrijal Khairurrijal; M. Barmawi
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

Deposition of NiFeCo thin films have been successfully grown by dc-unbalanced magnetron sputtering method. The linearity coefficient of thin films were 0.9169 at horizontal position and 0.953 at vertical position (sample 250902) and 0.8076 at horizontal position and 0.889 at vertical position (sample 260902), which is close to 1 for the ideal R-H characteristic. From XRD characterization, it was shown that the NiFeCo thin films were amorphous, and small grains, which was observed by SEM. The thin films thickness were 0.42 micrometer (sample 250902) and 0.26 micrometer (sample 260902). EDAX characterization shows that the composition of weight percent were: Ni(71.57%):Fe(7.44%):Co(20.99%) for sample 250902 and Ni(72.21%):Fe(10.27%):Co(17.25%) for sample 260902. These preliminary results will be discussed for future possibility of fabrication thin films in the prospect for device applications.
Oxygen Doping Effects on the Re-entrant Point of Vortex Melting Line in Bi2Sr2CaCu2O8+δ and YBa2Cu3O7-δ Superconducting System D. Ulfaty; M. Diantoro; W. Loeksmanto; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

The complexity of vortex morphology of high Tc superconductor is marked among others by the existence of “re-entrant” phenomena of vortex melting lines in the B-T diagram. This peculiar behavior has its origin in the large anisotropy, disorder and thermal fluctuation effects. Materials having those characterictics are Bi2Sr2CaCu2O8+δ (BSCCO-2212) and YBa2Cu3O7-δ (YBCO-123). The re-entrant point (B*,T*) can be regarded as the intersection point between the low field melting curve and the high field melting curve. The values of B* and T* generally depend on the critical temperature (Tc), anisotropy factor (ε) and penetration depth (λ). The results of analysis based on the data of Tc, ε, and λ from the samples of BSCCO-2212 and YBCO-123 single crystals show that B*>Bc1 and T*<Tc with Tc-T* ranging from 0.13K to 0.28K for BSCCO-2212 and 0.05 to 0.06 for Y-123 samples, while the value of B* spans the range of 0.35G – 0.7G and 0.40G – 0.45G for BSCCO-2212 and YBCO-123 respectively. It is emphasized however, that the results obtained are strongly depend on the choices of Lindemann constant cL and Ginzburg parameter G.
Development of Single-Board Computer Based Web Server for Physics Related Instrumentation and Its More General Usage Endarko Endarko; Zaki Su’ud
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

The web server single-board provides web access to some digital I/O and serial I/O signals without the need for assistance from external PCs or UNIX computers. It’s stand-alone device with real-time networking kernel, a TCP/IP stack, and HTTP web server. This project started partly as an excuse to use a new microprocessor and partly to settle a long-standing argument about the possibility of delivering web pages with a commercial microcontroller. The Atmel AT90S8515 microprocessor looked exciting with it’s low power RISC processor, 8 KB flash program memory, 512 bytes of EEPROM, 512 bytes of RAM, 32 I/O lines, and a built-in UART. The proposed device is designed application for physics related instrumentation and its more general usage.
The Spectrum Analysis of Rainfall in Indonesia Sinta Berliana Sipayung; Hariadi T.E; Nurzaman A; Eddy Hermawan
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

As a specific region at equatorial, namely maritime continent, the characteristics of meteorological element, especially rainfall in Indonesia is influenced by monsoon climate, called typical rainy and dry season. We have analyzed monthly mean of rainfall measured at twenty two (22) stations over Aceh, Medan, Padang, Jambi up to Biak for the period of 20 years (1970 to 1989). By using bandpass filter and spectrum analysis we could obtain the characteristics and predominance of Indonesian rainfall oscillation. We found that the characteristics of these rainfall could be identified in form of Semi-Annual (SAO), Quasi-Biennial Oscillation (QBO), and EL-Nino/Southern Oscillation (ENSO). We also could identify the predominance peak of these oscillations.
An Application of Radio Acoustic Sounding System (RASS) with Equatorial Atmosphere Radar (EAR) for Continuous Measurement of Atmospheric Virtual Temperature over Kototabang, West Sumatera Eddy Hermawan
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

We have introduced a new Equatorial Atmosphere Radar (EAR) in a collaboration project between Radio Science Center for Space and Atmosphere (RASC), Kyoto University, Japan and the Indonesian National Institute of Aeronautics and Space (LAPAN) at Kototabang, Bukittinggi, West Sumatera. This radar is mainly designed to observe winds and turbulence in the troposphere and lower stratosphere with a good time and spatial height resolution. Numerous studies or research programs with the EAR have been planned. One of them is the observation of fine structure in the vertical profile of atmospheric temperature using Radio Acoustic Sounding System (RASS). Since the full instruments are under construction, we present in this paper a brief review of the basic principle of RASS, especially on the design of an acoustic transmitter measurements with EAR. Aan example the comparison between RASS and radiosonde data on 6 November 2001 is also presented.

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