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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 3 Documents
 1 
Search results for , issue "Vol. 6 No. 1 (1971)" : 3 Documents clear
Geothermal System of the Dieng-Batur Volcanic Complex M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 1 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

This paper is mainly concerned with the evaluation of reports on geophysical and geochemical surveys made by Group Seven Inc. and Truesdell in the Dieng Mountains under contract with US-AID and on behalf of the Directorate General for Power and Electricity and the Indonesian Geological Survey and partly also with the author's own field observation on geothermy in the Dieng Mountains in Central Java. All the accumulated data lead to the conclusion that the geothermal system of eastern Dieng originated through the intersection of two major fracture zones. The high chloride content found in various streams gives good reason to accept that the geothermal system of the Dieng Mountains is a system of hot water and steam rather than a system of dry steam only. The hot springs in the Dieng Mountains might represent surface manifestation of a deep, neutral, hot water "reservoir". The distribution of geo-electric anomaly which resulted from two dipole mapping surveys delineated a belt of anomalously low resistivity in the eastern Dieng Mountains in which there are three areas of very low resistivity indicating systems of up-welling thermal water. These systems might be connected at great depth. The area with low resistivity anomaly might indicate a reservoir having a volume of 5 to 6 cubic kilometers at depth of 2 kilometers. An estimate based on geophysical data suggests that a power production rate of 200 megawatts could be supported for 25 years, or of 100 megawatts for 50 years. Based on all those data an exploratory deep drilling work is recommended which is due to start in June 1971. 
Locally Linearized Solution of Lifting Transonic Flow by Method of Parametric Differentiation Harijono Djojodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 1 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

The governing equation of transonic small disturbance flow present a non-linear partial differential equation which is difficult to solve. The method of parametric differentiation reduces the non-linear partial differential equation of transonic flow into an ordinary differential equation with variable coefficient, which is generally much simple to solve. Further simplification is introduced, as also done in the method of local linearization, by assuming (1-M12) to vary sufficiently slowly, so that in some part of the analysis its derivatives with respect to x can be disregarded. Based upon these methods, the lifting transonic flow was analyzed. For the subsonic and supersonic parts, closed form solutions were obtained. For the case M1 â‰ˆ 1, the method yields an integral equation, which can be solved by an iterative scheme starting from the non-lifting solution. 
A Simple Intermolecular Model Used to Study Interfaces Filino Harahap
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 1 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Flachsbart and Anliker (1) used a simple molecular model to study the effect of gravity on the contact angle and the interface shape. Here, the problem is extended by considering the solid body rotation of a constant volume liquid in a pan. The effect of the centrifugal body force is included in an attempt to study dynamic effects on the contact angle. It was found, that the contact angle is not dependent upon the included body forces as far as the order of approximation of the analysis is concerned. The microscopic structure of the gas-liquid interface, which is involved in the problem considered, the structure of the surface tension and the contact angle are presented. 

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