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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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Chaotic properties of standing waves in a Kerr grating Arie Irman; Theo P Valkering
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

Helmholtz equations for a 1-d Kerr grating depend periodically on the propagation direction and their trajectories show irregular, 'chaotic' behavior. The usual Coupled Mode model for a shallow grating is derived from Helmholtz equations by an averaging procedure. They are autonomous and the (spatially) chaotic eects do not appear.Here we compare the predictions for standing monochromatic waves at the Bragg frequency in a multi-layer structure on the basis of the CM model, with those based on the original Helmholtz equation. A scaling result for the dimensions of the chaotic region in the phase plane is obtained in terms of the linear index contrast. Waves with period of the envelope of the order of the inverse squared of the index contrast show irregular features, primarily in phase.
Shallow Nonlinear Bragg Grating for High Intensity Application H. Alatas; A.A. Iskandar; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

A study of shallow nonlinear Bragg grating with large intensity enhancement has been carried out using the standard couple mode theory. We show that for a sufficient intensity enhancement, the nonlinear modulation effect should not be neglected. We study the existence of gap solitons and show that the nonlinear modulation terms do affect their profiles.
The Effects of Sinusoidally Modulated Linear Refractive Index on The Wave Characteristics in Linear and Nonlinear Media Muksin Muksin; R.E. Siregar; A.A. Iskandar; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

A numerical study has been carried out on the effects of shallow sinusoidal modulation on the refractive index of linear and nonlinear medium. The result on the linear system demonstrates generally the existence of a transmission band gap at acertain range of wavelength as usually revealed by analytic solution obtained with strictly nonreflecting boundary condition. It is shown in the numerical results that a more general boundary condition leads to similar transmission characteristics as the device length becomes much larger than the modulation period. A further description is given on the variation of gap characteristics with the system parameters. The extension by including the nonlinear term representing the intensity dependent refractive index (IDRI) effect gives rise to a new feature of the transmission gap, exhibiting imperfect reflection characterized by the appearance of transmission channels in the gap. As the input intensity increases, further modification of the gap feature occurs in conjunction with the appearance and growth of hysteretic effect featuring multistable states useful for logic functions. The variations of hysteretic characteristics with respect to the system parameters are also described.
Pengaruh Perlakuan Implantasi Hidrogen terhadap Sifat Struktur Lapisan Tipis Amorf Silikon Karbon (a-SiC:H) Hasil Deposisi Metode DC Sputtering Rosari Saleh; Lusitra Munisa
Indonesian Journal of Physics Vol 14 No 2 (2003): Vol. 14 No.2, April 2003
Publisher : Institut Teknologi Bandung

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Abstract

Infrared absorption measurement of hydrogenated amorphous silicon carbon films (a-SiC:H) deposited by dc sputtering method have been performed for prior- and after hydrogen implantation. The films were deposited by silicon target in argon and methane gas mixtures. The results suggest that both 720 and 780 cm-1 absorption are due to Si-C stretching mode and the transition of the absorption from 2000 to 2100 cm-1 as the methane flow rate increase is not due to a change in carbon concentration, but rather to the formation of voids as supported by hydrogen effusion experiment results.
Relasi Gap Optis dengan Struktur Ikatan Lapisan Tipis Amorf Silikon Karbon (a-SiC:H) Hasil Deposisi Metode DC Sputtering Rosari Saleh; Lusitra Munisa
Indonesian Journal of Physics Vol 14 No 2 (2003): Vol. 14 No.2, April 2003
Publisher : Institut Teknologi Bandung

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Abstract

The influence of hydrogen and carbon incorporation on the optical gap of amorphous silicon carbon (a-SiC:H) films deposited by dc sputtering methods were observed and analysed using ultra violet-visible (UV-VIS) and infrared spectroscopy. Hydrogen content NH and carbon concentration NC in the films increases considerably with increasing methane flow rate. Both hydrogen and carbon content induces the widening of the optical gap through its linear relation with Si-H, C-H and Si-C vibration absorption. For low methane flow rate, the widening of optical gap is mainly due to an increase of hydrogen content. The incorporation of carbon led to increase the optical gap for higher methane flow rate.
Radical Formation in X-Irradiated Amino Acids and Its Relation to The Crystal Structures Frida U. Ermawati
Indonesian Journal of Physics Vol 14 No 2 (2003): Vol. 14 No.2, April 2003
Publisher : Institut Teknologi Bandung

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Abstract

Electron spin resonance (ESR) spectra from L and DL optical isomers of six amino acids have been observed after x-irradiation at 77K. A Varian E-12 spectrometer equipped with a rectangular parallelepiped microwave cavity to produce TE102 mode was utilized for this purpose. It was obtained that for most of the acids, spectra from the L and DL isomers are different at corresponding temperature in the range from 77 to 300K. These differences are attributed to differences in crystal structure, especially to the conformation of the amino group with respect to the adjacent carboxyl group of a system.
Comparative Study on Magnetic Characterization of Iron Sand from Several Locations in Central Java Agus Yulianto; Satria Bijaksana; Waloejo Loeksmanto
Indonesian Journal of Physics Vol 14 No 2 (2003): Vol. 14 No.2, April 2003
Publisher : Institut Teknologi Bandung

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Abstract

Iron sand is a natural resource that is widely distributed in a number of places in Java. Although it is widely known, iron sand has not been utilized and exploited fully. To explore the possible utilizations of iron sand, we have carried out a survey on magnetic characters of iron sand from several locations in the north coast as well as in the south coast of Central Java. Samples in the form of raw iron sand were directly from the beach and were sun dried to reduce their water content before being taken to the laboratory. The mineralogy of the sample was observed using optical microscope as well as by X-ray diffraction method. Magnetic characterization was carried out by the measuring the magnetic susceptibility as well as the IRM (isothermal remanent magnetization) and its decay against demagnetization. The results show that the main magnetic mineral in iron sand from all location is magnetite (Fe3O4). Other magnetic minerals such as hematite and ilmenite are also present in the iron sand. The mass susceptibility varies from 1.01 × 10-4 m3/kg for sample from Munggangharjo to 3.34 × 10-4 m3/kg for sample from Bayuran. IRM analysis shows that the magnetite content varies considerably from one location to another one. Magnetite in the iron sand taken from locations in the northern part of Java tends to have smaller grain size compared to those from the southern part of Java.
Pengaruh Kekeruhan Atmosfir Terhadap Kesetimbangan Radiasi Matahari Tuti Budiwati; Rukmi Hidayati; Iis Sofiati
Indonesian Journal of Physics Vol 14 No 2 (2003): Vol. 14 No.2, April 2003
Publisher : Institut Teknologi Bandung

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Abstract

The solar radiation intensity of 500 nm wavelength is measured by Eko-Sun photometer model MS-120 on clear days. The magnitude of atmospheric turbidity coefficient plays important role in increasing or decreasing temperature near earth’s surface. The atmospheric turbidity coefficients at wavelength of 500 nm in Bandung had range from 0.25 to 1.20 during dry season from June to October from 1996 to 1998. The decrease of atmospheric turbidity coefficient value of 0.015 was based on different value of atmospheric turbidity coefficient from 0.461 to 0.446 in 1996 and 1998 which resulted in increasing temperature near earth’s surface about 0.49oC.
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.

Page 8 of 34 | Total Record : 334

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