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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 339 Documents
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Metode Seismik Dalam Usaha Pendeteksian Reservoir Minyak Dan Gas Bumi (Penerapan Metode AVO) Awali Priyono
Jurnal Matematika & Sains Vol 5, No 1 (2000)
Publisher : Institut Teknologi Bandung

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Abstract

In this paper, a study of AVO (Amplitude Versus Off-Set) technique as hydrocarbon detection will be presented. The study have been carried out in the carbonate and sandstone reservoirs. AVO analysis, as showed in the range limited off set, indicates that dry carbonate, water or gas in the carbonate reservoir can be recognized from their amplitude responses. The difference in Poissons ratio value between water and gas in the carbonate reservoir is relative small, therefore care must be taken in the analysis. The study shows that, in the case of sandstone reservoar, the AVO response does not depend on the gas saturation, but this is not the case for oil saturation. AVO inversion using Damp Approximation Inverse (DAI) gives good accuracy, therefore this method is very helpful in estimating the elastic parameters such as Poissons ratio and modulus Young in relation to reservoir characterization.
Kandungan Kapsaisin dan Dihidrokapsaisin Pada Berbagai Buah Capsicum Sukrasno Sukrasno; Siti Kusmardiyani
Jurnal Matematika & Sains Vol 2, No 1 (1997)
Publisher : Institut Teknologi Bandung

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Abstract

Search for the hotest chilli pepper (Capsicum) fruits which was based on their capsaisinoid contents has been conducted. Chilli pepper fruits were collected from various places in Indonesia and two of them from Japan. From the 25 kinds of chilli pepper analysed, it was found that all C. frutescens contained capsaicinoids while in some C. annuum these compounds were not detected. Capsaicinoid content in chilli pepper fruits is affected by the their age and the highest content found in mature fruits before ripening which is indicated by the change of colour from green or pale yellow to red.
Penyerapan Zat Warna Tekstil BR Red HE 7B Oleh Jerami Padi Saepudin Suwarsa
Jurnal Matematika & Sains Vol 3, No 1 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

The straw in a agricultural wastes which is accumulated in a large quantity but still not much utilized, a part of it was burned and the other is used in a small part as an animals feed. At present, in Indonesia textile industries are so developed such that dyestuff and other colouring substances were very much used in the process especially in the dying process. Part of them was discarded as a waste  and becomes a pollutant, when it is discharged to the river in the environment. The straw have been investigated in a way that it can adsorb the dyestuff. Straw was first heated in 2% sodium hydroxide solution prior to usage followed by washing with water to neutral. The optimum adsorption was then determined. In the 0,1 M hydrochloric acid condition 1 gram of the straw adsorbed 9,8 mg of BR Red HE 7B dyes.
Operators Averaging And Its Application In Qualitative Variables Selection Maman A. Djauhari
Jurnal Matematika & Sains Vol 3, No 1 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

We introduce two mathematical propositions which will be developed for constructing a method for qualitative variables selection based on RV coefficient in the frame of Multiple Correspondence Analysis. Based on those propositions, variables selection will be transformed to the selection of set of Escoufier’s operators where its average maximizes the RV coefficient. The result is very promising. We will compare it to Escoufier’s method1).
Dasar-dasar Teori Model Tanpa Tanda Kesamaan Oki Neswan
Jurnal Matematika & Sains Vol 3, No 1 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

The new main notion studied here is the notion of a strong onto homomorphic relation R  between structures A and B denoted by A  B. We show that this notion generalizes many fundamental notions of model theory such as substructure and elementary substructure to the situation where an equality symbol is not assumed to be present in the first order language L. We generalize many results of model theory which usually assume that L has an equality symbol to this situation
On the Periodical Nature of Annual Variation of the Regressions of the Martian Polar Caps Using the Phase Dispersion Minimization-(PDM) Method Iratius Radiman; Chatief Kunjaya; Andreas Widjaja
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

Data observations of the regressions of the Martian Polar Caps from 1905 to 1988 were reinvestigated through the Stellingwerf’s Phase Dispersion Minimization-(PDM) method. The results indicate that the annual variations of the regressions of the Martian Polar Caps is seen to have a periodical nature. The main period is found to be approximately 40 years while other periodical components of shorter duration seen in the data also exist. The shorter periods are 3, 6 and 8 years respectively. The 3 years period may be attributed to the systematic effect of 2-3 years interval in which the data was acquired. The 6 years may be a subharmonic component of the 3 years period, though it is blended. The 8 years period cannot be attributed to the same effects of observations, such as the cyclic appearances of each polar caps in the Martian epoch of observations. Irregularity of the epoch interval of observations prevent such a systematic effect to be seen. Therefore, we like to point out that the 8-years period is a real physical phenomenon of the annual variations of the polar regressions. This strongly support the findings of Iwasaki and Ebisawa on sizes of the South Polar Cap. The PDM-method is sufficiently general to analyze small sets of data involving missing observations and non-sinusoidal time variations. The method was used to ascertain results obtained previously through time-series calculations which involved missing observations. Discussions on probable relations between changes in solar radiation which might affect the annual regressions of the polar caps are also examined.
Model Hidrodinamika Tiga-Dimensi (3-D) Arus Pasang Surut di Laut Jawa Nining Sari Ningsih
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

A three-dimensional coastal ocean circulation model is developed by employing the splitting method to reduce the large amount of computational work as one of the major problems related to three-dimensional model. The mode splitting technique splits the three-dimensional model into vertically integrated equations (external mode) and three-dimensional equations (internal mode). In further considerations the transformation of the governing equations from z-coordinate to a dimensionless vertical coordinate (σ) was performed to achieve a better simulation of both the surface and bottom mixed layers. The developed model is verified by comparing the simulation results in an idealized channel with those of POM (the Princeton Ocean Model). Then, the model is applied for simulating tidal currents in Java Sea.
Tomografi Waktu Tempuh Gelombang S dan Struktur 3-D Zona Penunjaman di Bawah Busur Sunda Sri Widiyantoro; Nanang T. Puspito
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

Tomographic imaging by using S-wave traveltime data to deliniate the three-dimensional subduction zone structure below the Sunda arc has been successfully conducted. Most of the resulting S-wave velocity model is in good agreement with the results of previous tomographic studies using P-wave traveltime data. The obtained tomographic images show that the lithospheric slab penetrates into the lower mantle beneath the Sunda arc, but there is an indication that the deep slab is detached from the seismogenic slab underneath Sumatra and the slab in the upper mantle is necking beneath Java.
The Comparison of the Material Properties of Reverse Osmosis Membranes with Respect to Their Performances Suryo Gandasasmita
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

Reverse osmosis has been used for water desalination. The performance of a reverse osmosis membranes is very much determined by both the natural properties of polymeric membrane materials, as well as the properties created through the manufacturing process. The purpose of this research is to study the influence of membrane material properties on the membrane performance in relation to its flux and solute rejection in reverse osmosis process. In this study, three membranes were prepared for reverse osmosis application, namely polysulfon membrane (PSf) and cellulose acetate membranes (CA27 and CA05). The CA05 membrane had the best performance among the three membranes, with reasonable flux and moderate rejection. Upon the examination of the three membranes, the differences of the membrane material properties became clear. Each property works in synergy to optimize membrane performance.
General Principles in Electrospray Mass Spectrometry: A New Technique in Mass Spectral Analysis Djulia Onggo; Daud K. Walanda; Robert C. Burns; Geoffrey A. Lawrance; Ellak I. von Nagy-Felsobuki
Jurnal Matematika & Sains Vol 3, No 2 (1998)
Publisher : Institut Teknologi Bandung

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Abstract

Electrospray mass spectrometry analyzes ions which have been generated in the gas-phase from electrically charged droplets obtained by nebulizing a solution. While the generation of an aerosol by electrospray was published by Zeleny in 1917, it was not until approximately some seven decades later when it was successfully interfaced to a mass spectrometer, thereby extending significantly the use of mass spectrometry in inorganic, biological and trace element research. The mechanism of ion generation by electrospray is still not definitively understood nor is the limitation of its linear dynamic range with respect to analyte concentration. This review will describe the general principles underlying this new technique.

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