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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 5 Documents
 1 
Search results for , issue " Vol 3, No 2 (1998)" : 5 Documents clear
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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