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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 21 No 4 (2010): Vol. 21 No. 4, October 2010" : 5 Documents clear
Attenuation Losses Due to Changes in Curvature, Temperature, and Pressure in Optical Fiber Cables Gwaro J.O; Maweu O.M; Kirui M.S.K
Indonesian Journal of Physics Vol 21 No 4 (2010): Vol. 21 No. 4, October 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.533 KB) | DOI: 10.5614/itb.ijp.2010.21.4.1

Abstract

In this paper, the attenuation losses due to changes in curvature, temperature, and pressure in optical fiber cables are investigated. A single mode optical fiber cable was subjected to curvature of radii 5mm, 10mm, 20mm, 30mm, 40mm and 50mm. An optical signal from a CW laser emitting beams in the range of 800nm-880nm was transmitted through the cable. Transmission percentage and variation in peaks were noted using an Optical Spectrum Analyzer and graphs plotted corresponding to each curvature radius. The single mode optical fiber cable was placed on thermal chamber where temperature was regulated .The range of temperatures considered corresponded to the ones of Nakuru area with changes in the order of 13oC, 20oC, 25oC, 30oC, 35oC and 40oC. Optical signal from CW laser emitting wavelength radiation in the range 800-880nm was transmitted over the optical fiber. Various transmission graphs were plotted for each temperature change. Similarly, the single mode optical fiber cable was subjected to pressure using various masses in the range of 1kg, 2kg, 3kg, 4kg, 5kg and 6kg. The masses exerted stress on the cable. The optical signal from the CW laser was transmitted and its transmission quality analyzed. Various transmission graphs were plotted for each pressure exerted. Transmission percentage was found to be proportional to the size of the curvature. It was observed that as the curvature reduces there is a reduction in transmission percentage definitely attenuation loss. Transmission percentage and the nature of peaks were noted for each temperature. Transmission percentage and the nature of peaks changed according to the weight applied. This study showed that increased pressure resulted to increased attenuation which resulted to minimal or no signal transmission
Left-Right Model of Electroweak Interaction with One Bidoublet and One Doublet Higgs Fields Asan Damanik
Indonesian Journal of Physics Vol 21 No 4 (2010): Vol. 21 No. 4, October 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.607 KB) | DOI: 10.5614/itb.ijp.2010.21.4.2

Abstract

We study the predictions of the left-right model of electroweak interaction based on SU(2)L ⊗ SU(2)R ⊗ U(1) gauge group by using one bidoublet and one doublet Higgs fields. By choosing appropriate vacuum expectation values of Higgs fields, the low energy phenomenology of electroweak interaction can be understood. Leptons can acquire a mass via two scenarios, first via a Higgs mechanism with non-zero 'hypercharge-like' I in the Lagrangian density mass terms with the Yukawa couplings G1 >> G1* , and the second via a Higgs mechanism followed by a seesaw-like mechanism without the requirement that G1 >> G1*
Seismic Moment Tensors of Padang 20090930 and Jambi 20091001 Events in Jambi using Three Component Local Waveforms: Identification of the Active Fault Plane Madlazim Madlazim; Bagus Jaya Santosa; Widya Utama
Indonesian Journal of Physics Vol 21 No 4 (2010): Vol. 21 No. 4, October 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1225.762 KB) | DOI: 10.5614/itb.ijp.2010.21.4.3

Abstract

A research has been conducted to estimate earthquake source parameters occurred on 30/09/2009 with 7.5 moment magnitude and 01/10/2009 with 6.4 moment magnitude. The event on 30/09/2009 was occurred in the sea and triggered by a mechanism related to subduction plane, while the one in 01/10/2009 occurred in the ground and triggered by the activity of Semangko Fault. The data used to determine the parameters of both earthquake source are three component local waveforms that are recorded by three MY broadband stations which belong to IRIS/Malaysia (IPM, KOM and KUM) and IRIS/Singapore MS network broadband station (BTDF). Availability of the three component local waveforms data is an opportunity to conduct a detailed research for earthquake source parameters in this area. In this paper, we report a focal mechanism of both events using Discrete Wave Number method to calculate the Green function and deconvolution iteration method to invert the tensor moment from three component local waveforms. Both methods are integrated in ISOLA_GUI software. The data is inverted at 35 mHz until 70 mHz to obtain the earthquake source parameters. Source parameters of both earthquakes (seismic moment, moment magnitude, orientation and fault plane and slip length) were extracted after double couple (DC) value were obtained and the reduction variant of each events are 99.3% and 70% and also 95.3% and 73%, respectively. To identify the fault plane, the HC-plot method is used, and to determine the length and width of the fault plane and also the slip length, an empirical equation is implemented in the Coulomb software. From the analysis, we obtain the type of fault for both earthquakes having strike, dip and rake angles that represent the fault plane orientation for both faults which are 88°, 70°, 146° and 149°, 49°, and -176°. The length and width of the fault and the slip length of both events are 124 km; 33.8 km; right lateral = 1.3 m and reverse slip = 0.88 m and also 22.68 km; 10.96 km; right lateral = 0.59 m and reverse slip = -0.04 m, respectively.
Analysis of Forward Anti-Plane Elastodynamic Problem in an Infinite Medium using Boundary Integral Equation Method Neny Kurniasih
Indonesian Journal of Physics Vol 21 No 4 (2010): Vol. 21 No. 4, October 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1124.715 KB) | DOI: 10.5614/itb.ijp.2010.21.4.4

Abstract

The anti-plane elastodynamic problem could be governed mathematically and expressed by the linear second-order partial differential equation. With the aid of the dynamic reciprocal theorem, the differential equation is transformed into an equivalence integral one. The evaluation of singular integral is performed analytically while the nonsingular one is calculated numerically using the standard Gaussian quadrature. As numerical implementations, boundary solutions are investigated for an infinitely long cavity with various cross sections due to various angles of incident wave. The method is applied for various spatial and time elements.
Moving Average as an Alternative Technique in Determination of Nuclear Shell Correction Rizal Kurniadi; Yuda Satya Perkasa; Abdul Waris
Indonesian Journal of Physics Vol 21 No 4 (2010): Vol. 21 No. 4, October 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.987 KB) | DOI: 10.5614/itb.ijp.2010.21.4.5

Abstract

Since Strutinsky has proposed shell correction for calculating nuclear mass at 1967, there are many studies concerning this topic. These former researches used the expansion of a Dirac delta function which uses hermite polynomials as a method. This paper discusses about an alternative technique to calculate shell correction by employing a moving average method. The results show that, although the proposed method can produce the shell correction, it still has enough discrepancies compared to the experimental nuclear mass.

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