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Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 5 Documents
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Search results for , issue " Vol 13, No 1 (2008)" : 5 Documents clear
Astrometric Study of Galactic Clusters. I. NGC 3532 Suhardja Wiramihardja; Yayan Sugianto; Muhammad Ikbal Arifyanto
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Astrometric study of galactic clusters using UCAC2 catalog containing proper motion data is described. Kinematicalanalysis is applied to determine cluster membership. The near infrared photometric data of the same catalog is used toderive physical parameters of the cluster. In the present study the case for NGC 3532 is given. An isochrones fitting tothe color-magnitude diagram gives the age of cluster in log t = 8.85 and the distance of 515 ± 41 pc with infraredreddening in J filter of 0.043 ± 0.017 mag. Our results are in good agreement with results of previous studies.
Penanda Molekul DNA Mikrosatelit untuk Karakterisasi Bibit Jamur Kuping (Auricularia polytricha [Mont.] Sacc.) I Nyoman Pugeg Aryantha; Yuniar Mulyani; Rahmat Ariffudin
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

This study aims to find out a method of spawn characterization for wood ear mushroom (A. polytricha [Mont.] Sacc.)based on microsatellite DNA marker. Four strains of wood ear mushroom cultivated in several regions of Java i.e AUC(West Java), AUCN (Central Java), AUP (West Java) and AUT (West Java) were evaluated. A pair of designed primers(5’ -GGGAAAGTGATCCCATCTT-3’ and 3’-AGTTGTGGGAACATCGAACT-5’) was able to amplify microsatelliteDNA from those four strains of wood ear mushroom. Strains AUC, AUCN and AUP share the same positions (2 loci) ofmicrosatellite motive (TC)n with PCR products of 212 and 201 bp, while the same motive for strain AUT was found atdifferent loci with PCR products of 127, 108, and 96 bp. The same motive was also found at another locus of strainAUC and AUP with a PCR product of 228 bp. Another different locus with a PCR product of 85 bp also gave positiveamplification result for strain AUC. The data on macroscopic characters (mycelial growth rate and quality, fruitingpercentage and mushroom yield) revealed that AUC, AUCN and AUP are good strains, while AUT is bad strain.Overall, there is a good correlation between molecular (microsatellite DNA) patterns and macroscopic data on mycelialgrowth rate and quality, as well as flushing percentage and mushroom yield. Therefore, microsatellite DNA motive of(TC)n can be adopted for spawn characterization of wood ear mushroom.
Analisis Filogenetik Molekuler pada Phyllanthus niruri L. (Euphorbiaceae) Menggunakan Urutan Basa DNA Daerah Internal Transcribed Spacer (ITS) Topik Hidayat; Diah Kusumawaty; Kusdianti Kusdianti; Dian Din Yati; Astry Agusthina Muchtar; Dina Mariana
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Variation of DNA sequences of the internal transcribed spacer (ITS) region has been used as a molecular character tounderstand the phylogenetic relationships within different strains of Phyllanthus niruri and with other species belonging tofamily Euphorbiaceae. Phylogenetic analysis of 19 plant samples using parsimony method revealed several findings: as awhole family, Euphorbiaceae is a monophyletic group and the family is divided into two major clades based upon its singleleaf arrangement; genus Phyllanthus is a non-monophyletic group, though species Phyllanthus niruri is a monophyleticgroup; major classification system of Phyllanthus niruri at the molecular level does not support previous majorclassification; Saoropus androgynus is closely related with Phyllanthus niruri.
Synthesis of Copolymers by Ring-Opening Copolymerization of δ-Valerolactone and 2,2-Dimethyl-1,3-Propandiol Monomers and Their Characterization I Made Arcana; Bunbun Bundjali; M Hasan; Helen Mariani; Shinta Dewi Anggraini
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Copolymers of δ-valerolactone and 2,2-dimethyl-1,3-propandiol monomers P(VL-co-DP) as raw materials in synthesisof poly(urethane-ester) were prepared by a ring-opening polymerization of 2,2-dimethyl-1,3-propandiol and δ-valerolactone monomers in various composition using 1-hydroxy-3-chloro-tetraisobuthyldistanoxane as a catalyst.Characterizations of polymers were carried out by analysis of functional groups, microstructure, viscosity, hydroxylnumber, and also thermal properties of copolymers. The copolymers of 2,2-dimethyl-1,3-propandiol and δ-valerolactonemonomers have a triblock chain structure, that is P(VL-block-DP-block-VL) with various chain lengths, which dependon VL/DP ratio used in copolymerization. The increase of δ-valerolactone composition used in polymerization leads toan increase of molecular weight and melting point as well as a decrease of hydroxyl number of copolymers.
On Estimating the Transition Probabilities: A Case Study Sutawanir Darwis; Kuslan Kuslan
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

In actuarial science, a multistate process deals with the joint distribution of two random variables: time until termination and cause of the termination. In a three state process (active, retired, death), an insured in active state canbecome retired according to a force of decrement of retired, insured in retired state can move to death state accordingto a force of decrement of mortality. The main issues are the development of the estimation methods for transitionprobabilities and its implementation on a real data set. Analytical studies of multistate model are well developed in theliterature. However, the empirical studies based on real data set rarely reported. Furthermore, published works focusedon modeling the transition probabilities as function of period of transition. This work presents an extension of transitionprobabilities as function of age of insured and period of transition. A case study of modeling three state process andmethodology for estimating the model parameters from an insurance database under constant forces of decrement ispresented. The forces of decrement was estimated using single decrement moment estimation procedure, and yields atransition probability for a three state models. This paper aims to contribute to the development of empirical transitionprobabilities of multistate model based on real data set as an alternative to the traditional approach to doubledecrement modelling.

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