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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 7 Documents
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Search results for , issue " Vol 15, No 3 (2010)" : 7 Documents clear
Geometri Bintang Berotasi Pada Keadaan Ambang Iwan Setiawan; Muhammad Farchani Rosyid
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

The mechanical equilibrium configuration of rotating stars is discussed through Roche model. In our study, the stars are assumed to rotate rigidly, while their geometry are determined by the use of their equipotential surfaces. The critical state is achieved by a rotating star, when its total gravitational force vanishes. There are two posibilities for a star to be in its critical state: either its effective gravitational force vanishes or it exceeds the Eddington limit. The meridional section of rotating stars of various masses and angular velocity are determined.
Perbandingan Hasil Atenuasi Tomografi 3D Menggunakan Metoda Spectral Fitting & Spectral Ratio Dalam Usaha Pemetaan Bawah Permukaan (Studi Kasus Gunung Guntur) Awali Priyono; Gede Suantika; Sri Widiyantoro
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Spectral fitting and spectral ratio methods are tested to estimate the Q value or attenuation in the effort on imaging the subsurface structure using three-dimensional tomographic inversion techniques. In this study, we used microearthquakes data around Mount Guntur that was collected from 1995 until 2007 that consist of 4800 seismograms. Analyses using the spectral fitting and spectral ratio methods generally depict the same anomalous areas. Studies using P and S waves indicate that the area of high attenuation corresponds to the area of low velocity that extending from mount Guntur to Kamojang caldera. In terms of the image quality, it can be seen that the attenuation derived using the spectral ratio of S wave has the same pattern with the one derived using P wave. This is due to the attenuation of S wave, which was derived directly from the P-wave. The Q value in the spectral ratio method depends on the width of the frequency window taken and the effect of noise in the determination the slope of the linear relationship between the natural logarithm of spectral ratio with frequency. The result of the spectral fitting analysis shows that the pattern of S wave attenuation image is different from the pattern inferred from the P wave data, because each attenuation image has been determined separately and does not depend on each other. Since the sensitivity of the values of Qp and Qs are important in fluid rock identification, the determination of Qs should not depend directly on Qp. With the various reasons above and more influential factor in estimating the value of Q using spectral ratio, the spectral fitting method is more recommendable to be employed to determine the value of Q.
A New Method for Dual Fully Fuzzy Linear Systems by use LU Factorizations of the Coefficient Matrix Mashadi Mashadi
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

In this paper we will discuss an alternative way to solve dual fully fuzzy linear system of the form . Next we crisp coefficient matrix  and  through form LU factorizations and we will construct a simple algorithm for the solution of these system. Finally we will illustrate our method by solving some examples.
Electrical Characteristics and Annealing Effect on Al/n-GaSb Schottky Diode Doped Using DMTe Ari Handono Ramelan; Harjana Harjana; Pepen Arifin; Ewa Goldys
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

The electrical properties of Al/n-GaSb Schottky diodes, doped with 1.4 × 1018 cm−3 (tellurium) were examined.  C-V (capacitance-voltage) measurements at 300 K show barrier heights of 0.63 eV, compared to 0.59 eV determined from room temperature I-V (current-voltage)  measurements. The voltage and frequency dependence on the capacitance is due to the ideality factor of the Schottky barrier and due to a high series resistance.  At low frequency the measured capacitance is dominated by the depletion capacitance of the Al/n-GaSb Schottky diode which is bias-dependent and frequency-dependent. The diode shows a strong temperature dependence of ideality factor from approximately 3.6 at room temperature to as high as 6.7 at 140 K.  There may be a small portion of the device nonideality attributable to generation-recombination currents due to deep levels in GaSb. The barrier height decreased from 0.57 eV to 0.35 eV for the sample annealed at 300oC for 1 minute.
Pengaruh Gangguan pada Perubahan Prioritas dan Indeks Konsistensi Matriks Perbandingan Berpasangan dalam Analytical Hierarchy Process Hanni Garminia; Moh. Hafiyusholeh; Pudji Astuti
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

A pairwise comparison matrix (PCM) is a matrix arising in Analytical Hierarchy Process (AHP). The application of the AHP as a decision problem tool gives rise to pairwise comparison matrices (PCM). In this work we investigate sufficient conditions on the disturbance which results in reversal of the rank order of the decision alternatives while the PCM  remains consistent.
New Extremal Self-dual Codes of Length 36 Djoko Suprijanto; Bagus Ilman
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

A paper of Conway and Sloane (1990) gives the putative weight enumerators of extremal self-dual codes for length n £ 64 and n = 72. The construction of such codes with putative weight enumerator has been one of the fundamental problems in Coding Theory. In this paper, we construct new extremal binary self-dual codes of length 36. We show that there are at least 17 inequivalent extremal binary self-dual codes of parameter  [36, 18, 8]. Our invention upgrades the previous known result provided by Conway and Sloane (1990), Harada (1999), and Kim (2001).
Influence of Artocarpus communis Leave Extract on the Physical Characteristic of Pellet Heni Rachmawati; Tjandrawati Mozef; Shafiqah Adam
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Artocarpus communis (Forst.) is popularly known in English as breadfruit tree because of the bread-like texture of its edible fruits. The leaves are potential for fever and liver disorders and it also possesses significant anti-platelet and anti-inflammatory activities. The aim of this study is to formulate ethyl acetate extract of Artocarpus communis leaves into a solid dosage form. Pelletization was developed to formulate the extract. The formula was prepared using various ratios of extract (5, 10, 15 and 20 %) with PVP as a binder and Avicel pH101 as a filler. The influence of extract concentration was studied on the pellet characteristics. Pellet was prepared by extrusion-spheronization technique. In order to produce pellet with optimum diameter (500-900 µm), the moisture of the extrudates must be around 40%, with spheronizer speed of 800-900 rpm for 1.5 minutes. In particular for flow property, all pellets containing more than 5% of Artocarpus communis leaf extract were better (> 8 g/s) over blank pellets (< 4 g/s). In conclusion, the presence of extract in the pellet formulas improved the physical characteristic of pellet. The self binding property of the extract is suggested as a key parameter for this improvement.

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