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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 5 Documents
 1 
Search results for , issue "Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004" : 5 Documents clear
Electrical Properties of Fatty Acid in Salted Chitosan Membranes M.Z.A. Yahya; R. Puteh; A.K. Arof
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

Films of chitosan polymer doped with lithium acetate (LiOAc) and placticized with oleic acid (OA) and palmitic acid (PA) were prepared by the solution cast technique. Impedance spectroscopy and XRD techniques have been used for the analysis. The film containing 40 wt.% LiOAc and 10.0 wt.% of OA exhibit a room temperature conductivity of ~ 10-5 S cm-1 and the film containing 41.0 wt.% LiOAc and 7.7 wt.% of PA has conductivity ~ 10-6 S cm-1. The plot of ln(σT) versus 103/T for the highest conducting samples obey an Arrhenian relationship in the temperature range between 300 and 363 K implying that the conductivity is thermally assisted. From conductivity-temperature studies the samples with high conductivity has low activation energies and vice-versa. The materials are ion conductors and the complex modulus formalism is further proof that the materials are ionic conductors.
Ionic conductivity studies of LiCF3SO3 doped hexanoyl-chitosan polymer films Tan Winie; A.K. Arof
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

Hexanoyl-chitosan that exhibited solubility in THF was prepared by acyl modification of chitosan. Films of hexanoyl-chitosan containing LiCF3SO3 were prepared by the solution cast technique. Complexation of the prepared electrolytes was studied by FTIR analysis. For the system containing 30 wt.% LiCF3SO3 salt, the room temperature conductivity achieved was 6.03 x 10-7 S cm-1 and with the addition of 30 wt.% EC to this system, the conductivity was enhanced to 2.75 x 10-5 S cm-1. The variations in conductivity at room temperature are explained by the Rice and Roth model from which the density of mobile ions, mobility of ions and diffusion coefficient were obtained.
Gallium Arsenide Thin Films Grown by MOCVD With Various Growth Conditions I. Hamidah; N. Yuningsih; P. Arifin; M. Budiman; M. Barmawi
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

GaAs films were usually grown by metal organic chemical vapor deposition (MOCVD) using AsH3 and trimethyl-gallium (TMGa) as precursors. In this study, trisdimethylamino-arsenic (TDMAAs) and TMGa had been successfully used as As and Ga precursor, respectively. For these experiments, the growth temperature was allowed to range from 580 to 600 oC, the total reactor pressure was varied from 50 to 70 torr, and the flows of hydrogen and nitrogen were varied from 200 to 400 sccm. The TDMAAs/TMGa ratio was kept at 4.5. The structural and electrical properties were characterized using SEM method and standard van-der Pauw Hall measurement, respectively. The best growth condition occurred at growth temperature of 580 oC, reactor pressure of 50 torr, H2/N2 ratio of 1,and V/III ratio of 4.5. This film had grain size of 1.08 µm, growth rate of 0.94 µm/h, 395 cm2/Vs mobility, and hole concentration of 3.44 x 1015 cm-3
Time Dependent S-brane Solutions in Five Dimensional Supergravity F.P. Zen; Arianto Arianto; B.E. Gunara
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

We study time dependent S-brane solutions in gauged and ungauged supergravities in five dimensions. We find that the solutions have a close relationship with black holes and can be obtained by an analytic continuation from static black hole solutions.
Gauged N = 2 Supergravity from Type II Compactified on Calabi-Yau 3-Fold with Background Fluxes Bobby E. Gunara; Freddy P. Zen; Arianto Arianto
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

We address some geometrical aspects of a special class of four dimensional N = 2 supergravity theory obtained from Calabi-Yau compactification of the Type II supergravities with background Ramond-Ramond (RR) fluxes.In particular, several properties of the vector multiplet and hypermultiplet scalar manifolds determined by Calabi-Yau geometry and its deformation are considered. Moreover, aspects of background magnetic and electric fluxes on Calabi-Yau 3-fold which imply that the scalar manifolds have to be gauged with respect to their isometries related to the fluxes. We finally investigate the arising scalar potential and their vacua.

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