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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
 1 
Search results for , issue " Vol 8, No 3 (2003)" : 7 Documents clear
The Birth Rate of Low-Mass X-Ray Binaries Winardi Sutantyo
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

The evolutionary history and formation of low-mass X-ray binaries is considered. Various effects during their formation process are taken into account. Special emphasis is given to the common envelope evolution, the effect of an asymmetry in the supernova and the impact of the supernova shell on the companion star. Assuming a kick velocity between zero and 500 km s-1, the derived birthrate for low-mass X-ray binaries from the model computations is reconciable with estimated from the observed galactic population of O(100) and lifetime of O(108,7) yr if the common envelope efficiency is low (α CE ≤ 1,5). In this case, the derived birth rate depends only weakly on the kick velocity. Higher α CE results in a higher birthrate unless the kick velocity is also high (≥ 500 km s-1), which is incompatible with the observed mean velocity of pulsars. We conclude that the standard scenario produces a birthrate for low-mass X-ray binaries which is reconciable with the observations if α CE is low and this is valid for any kick velocity between zero and 500 km s-1.
Measurement of Sunspot Proper Motion Using Cross-Correlation Method Clara Yono Yatini; Soshinori Suematsu; Emanuel Sungging Mumpuni
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Cross-correlation method is a technique for determining the vector displacement that maximizes the spatially local cross-correlation between an image and a reference image as a continuous function of the image space. The crosscorrelation is defined as a function of position in the image, within a spatially localized apodization window. This method is applied to measure the proper motion of the sunspot accurately which can be calculated from a series of active region images as a function of time. This method gives a measure of the spot displacement unaffected by the jitter of the telescope.
Nonuniqueness Solution Forms of Close-Coupling Equations for e-He Scattering Agus Kartono; Toto Winata
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

The close-coupling method relies on the reformulation of the Schrödinger equation into an infinite set of coupledchannel equations by expanding over the complete set of target states. The target states approach will be used is a restricted basis for helium states in which one of the electrons is in a fixed orbital (1s) while the second electron is described by a set of independent L2 functions, thus permitting it to span the discrete and continuum excitations. This type of approximate description of the target should be good for scattering problems in which the dominant reaction mechanism is by one-particle (electron) excitations. We will also show why the standard close-coupling expansion gives rise to nonunique solutions.
Studi Pengaruh Rasio V/III terhadap Morfologi Permukaan Film Tipis GaSb yang Lilik Hasanah; Euis Sustini; Sukirno Sukirno; Maman Budiman
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Gallium Antimony (GaSb) thin film were grown on Semi Insulating (SI) GaAs (100) substrate by MOCVD (Metal-Organic Chemical Vapor Deposition) method. TMGa (trimethylgallium) and TDMASb (tridismethylaminoantimony) were used as precursors of group III and V, respectively, with H2 as gas carrier. The films were grown with V/III varied between 1,15 and 3,1. V/III ratio dependent of surface morphplogy and atomic composition of GaSb thin films were studied. The best surface morphology stoichiometric GaSb obtained at the V/II ratio of 2.0.
Synthesis and Acid Catalysed Condensation of 3-(1-Hydroxy-4-chlorobenzyl) -1-methylindole Mardi Santoso; David StC Black
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

3-(1-Hydroxy-4-chlorobenzyl)-1-methylindole (3) has been synthesised in three steps. The first step involved methylation of indole to give N-methylindole (4) in 87% yield which on Vilsmeier-Haack formylation in the next step gave new ketone (5) in 67% yield. Sodium borohydride reduction of the new carbonyl compound (5) in the last step afforded the new indole alcohol (3) in 99% yield. Treatment of the secondary alcohol (3) with p-toluene sulfonic acid has been examined which afford di-(1-methylindol-3-yl)-(p-chlorophenyl)methane (7) in 71% yield. 
Optimasi Proses Overproduksi, Pemurnian dan Karakterisasi Protein Mga Sebagai Molekul Target Untuk Pencegahan Infeksi oleh Streptococcus Pyogenes Muhaimin Muhaimin; Oei Ban Liang; Enny Ratnaningsih; Endang Purwantini; Debbie Soefie Retnoningrum
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Optimization of overproduction, purification and characterization of Streptococcus pyogenes’s Mga recombinant protein from Escherichia coli pMALMga carrying mga49 gene had been carried out. The overproduction optimization was conducted by culturing the Escherichia coli pMALMga of OD600 = 0,7 in LB medium with or without glucose, and induced by 0,3 mM IPTG for a certain period of time. The protein produced was MBP-Mga fusion protein with a molecular weight of about 104 kDa. The purification was conducted by affinity chromatography using amylose ligands at pH 7,4 and continued by SDS-PAGE. One band identified at 104 kDa showed that the MBP-Mga fusion protein was pure enough for further analysis. The MBP-Mga protein was then injected into rabbit to produce polyclonal antibodies. The antibody development was monitored by dot blot and Western blot. The antibodies produced gave a positive reaction to MBP-Mga fusion protein. Adsorption and precipitation of the polyclonal antibodies which gave a positive reaction to MBP protein was done by adding pure MBP protein (56 kDa) produced by Escherichia coli pMALc2, and purified by affinity chromatography using amylose ligands at pH 7,4. The results showed that the antibodies gave a positive reaction to Mga recombinant protein and a negative reaction to MBP recombinant protein.
Beberapa Oligomer Stilbenoid dari Tumbuhan Shorea multiflora Burck Noviany Noviany; Euis Holisotan Hakim; Sjamsul Arifin Achmad; Yana Maolana Syah; Lia Dewi Juliawaty; Norio Aimi; Emilio L Ghisalberti; Iqbal M. Choudhary
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

Two dimers of stilbenoids, (-)-balanocarpol (4), and (-)-ampelopsin A (5), along with a tetramer (-)-hopeaphenol (6) were isolated from the stem bark of Shorea multiflora Burck (Dipterocarpaceae), locally known as Meranti. Their structures were determined by physical and UV, IR, 1H-NMR, and 13C-NMR spectroscopic data.

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