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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue " Vol 7, No 1 (2002)" : 6 Documents clear
The Temporal Variations in Sunspot Number, Geomagnetic aa index and Southern Oscillation Index Iratius Radiman; Hiroshi Miyake; Chatief Kunjaya; Yoji Takeoka; Muhamad Irfan Hakim; Zadrach L. Dupe
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

A study of three monthly solar-terrestrial indices of mean sunspot number, geomagnetic aa index, and Southern Oscillation Index during period of 1882 to 2000 was carried out to find any consistent short –term periodicities. We found 19, 22, and 26-month periodicities persistently occur in the above data, i nstead of 11-year pattern. We suggest that they might have solar activity origin.
Aspek Reproduksi Ikan Kapiek (Puntius schwanefeldi Bleeker ) di Sungai Rangau – Riau, Sumatra Yustina Yustina; Arnentis Arnentis
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

A study on the reproduction aspect of Kapiek fish (Puntius schwanefeldi Bleeker) at three stations of the Rangau river in Riau – Sumatra was conducted in May – September 2000, by using a cast net and a gill net during trapping periods lasting three nights a month at each station for four months. A total of 375 individuals have been caught. The sexual ratio between males and females was not significantly different from 1. The first gonad maturation is at body weight of 115 g. The body length and body weight are proportional to the gonad maturation degree. The higher the gonad maturation index level, the higher the fecundity. Eggs which are ready to spawn are of diametre 0,27 to 0,40 mm. The distribution of egg diametre indicates that “ Kapiek” belongs to a kind of fish with a large fecundity and using a partial spawning type.
Farmakokinetik dan Ketersediaan Hayati Relatif Sediaan Kapsul, Tablet Salut Enterik dan Supositoria Ketoprofen Yeyet C. Sumirtapura; Badruzzaman Saungnage; Mamat Rachmat
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

Pharmacokinetics and relative bioavailability of ketoprofen in capsule, enteric coated tablet and suppository, following si ngle dose administration (50 mg for capsule and tablet, and 100 mg for suppository), had been studied in six healthy Indonesian volunteers with three-way crossover design. The drug concentrations in the plasma samples were assayed by a TLC -densitometric method. The results showed that ketoprofen was rapidly absorbed from the gastro-intestinal tract after administration of capsule with peak plasma concentration of about 3.7 mg/ml, which was reached in about one hour following the drug administration. Mean peak plasma concentrations of about 4.3 and 4.6 mg/ml were attained in relatively delayed time, i.e. about 2 and 1.5 hours, respectively after administration of enteric coated tablet and suppository. Ketoprofen was eliminated rapidly from the body with an el imination half-life of about 2.5 hours. The highest absorption efficiency was showed by the enteric coated tablet, followed by the capsule and the suppository.
Development of Affinity Adsorbent System for Purification of Protease Abdul Haris Watoni; Sapto Raharjo; Husein H. Bahti; Soetijoso Soemitro
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

The development of affinity adsorbent system for purification of protease produced by Bacillus sp. BAC-4 has been investigated. The research is initiated from preparation of non porous silica, aminopropyl silica matrix, and affinity adsorbent. In this research, the approximately spherical form of non porous silica with diameter of 1 – 15 μm and aminopropyl silica matrix has been synthesized. This matrices contains 65,7 μmol/g of amino group and show the similar FTIR spectrum to that of standard aminopropyl silica. Preparation result of affinity adsorbent shows that 10% n-butanol is the most applicable affinity ligand with 99,96% binding capacity to the matrix. The optimum activity of the purified protease with affinity adsorbent system is in the 0.05 N Tris HCl buffer pH 8.0 at 550C for 15 minutes with the degree of purity of 1248–fold to that in the crude extract.
A Note on Singularly Perturbed System Hengki Tasman; Theo Tuwankotta; Wono Setya Budhi
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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In this paper the solution of a singularly perturbed nonlinear ordinary differential equation which is obtained by using the asymptotic expansion method and a numerical method is analyzed in various values of the parameter of the equation. The numerical method which we use is Runge-Kutta-Feldbergh method of order 45, combined with the shooting method. Both solutions are verified using the first integral of the equation.
Pemakaian Metode Numerik Pada Sirkulasi Udara di Sekitar Bangunan Tradisional Bali I Gusti Bagus Wijaya Kusuma
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

The airflow patterns around traditional Balinese buildings cannot be estimated by experiment method nor using modern buildings, since the position and the function of a building on a cluster of traditional Balinese buildings are linked each other. It is not correct if the investigation uses an isolated building and symmetrical method in order to understand the airflow patterns of all buildings. Numerical method based on finite volume is used in this simulation since it gives quicker analyses and capable of delivering more detailed and comprehensive information about the flow structure around 3-dimension buildings. Results show that numerical method gives more accurate prediction of airflow patterns around traditional buildings.

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