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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 2 Documents
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Search results for , issue "Vol. 15 No. 3 (1982)" : 2 Documents clear
Penerapan Sistem Tegangan Tinggi Arus Searah (TTAS) Guna Menyalurkan Daya dari Bukit Asam ke Jakarta Harsono Harsono
Journal of Mathematical and Fundamental Sciences Vol. 15 No. 3 (1982)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Teknologi sistem penyaluran daya listrik dengan menggunakan tegangan tinggi arus searah (TTAS) telah semakin dewasa. Hal tersebut dibuktikan dengan semakin banyaknya instalasi sistem tersebut. Salah satu kemungkinan untuk menerapkan sistem dimaksud di Indoensia, adalah dalam rangka menyalurkan energi listrik dari PLTU-PLTU yang dibangun di dekat daerah penambangan batubara Bukit Asam, Sumatera Selatan ke Jakarta. Untuk tahapan pembangunan yang menggunakan satuan kapasitas sebesar 800MW, disarankan untuk menggunakan 3 sistem TTAS bipolar dengan tegangan kerja ± 400 kV, guna keperluan menyalurkan daya sebesar 2400 MW pada keadaan akhirnya. Abstract. At this moment the technology of the high voltage direct current (HVDC) power transmission is readily available. It is proven by the already existing system and the under construction and/or planned ones. One possibility to apply that mentioned technology in Indonesia is for transporting the electric energy generates at bukit Asam (South Sumatera) area to fulfill the energy need in Jakarta. For implementing the above purpose this paper propose to use three 800 MW capacity transmission lines to transport the ultimate power of 2400 MW. Each transmission is a bipolar with an operating voltage of ±400 kV.
Computational Scheme for Geosynchronous Satellite Orbit due to Gravitation of the Earth Harijono Djojodiharjo; Yus Kadarusman
Journal of Mathematical and Fundamental Sciences Vol. 15 No. 3 (1982)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

By analyzing the influence of the earth's gravitational anomaly on the orbit of a satellite around the earth, a computational scheme for geosynchronous satellite orbit with small inclination is developed. The governing equations of motion, which consist of three equations and have been simplified to take into account geosynchronous conditions and small displacements, are solved by numerical technique. In particular the radius of geosynchronous orbit is obtained by solving the first governing equation by Regula-Falsi method. Stationary points are obtained by indirect method, i.e. by first finding the longitude positions with zero longitudinal accelerations. The trajectory of the subsatellite point is obtained by solving the governing equations for small displacement by Runge-Kutta method. Comparison of computational result with Blitzer's and Flury's using IAU 1968 and GEM-8 data, leads confidence to the present scheme.

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