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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. 5 No. 1 (1970)" : 2 Documents clear
Penentuan Penggunaan Tanah Pertanian dengan Programming Linier Antardaerah Budhy Tjahyati Sugijanto
Journal of Mathematical and Fundamental Sciences Vol. 5 No. 1 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Penggunaan Linear Programming Antardaerah (Interregional Linear Programming) sebagai teknik analisa, adalah relatif sangat baru (Birowo 1965). Di Indonesia dimana luas penggunaan tanah untuk pertanian adalah dominan, ditjoba untuk diadakan prediksi mengenai tata penggunaan tanah jang maximum, dengan pengandaian penanaman beberapa djenis tanaman pertanian (field crops). Dengan demikian perlu suatu metode dan model kerangka analisanja. Jang penting untuk ditondjolkan disini adalah persoalan transport, kesubutan tanah dan biaja penanaman sebagai variable dalam model ini. Hasil model ini adalah suatu usul luas2 tanah untuk tanaman pertanian tertentu, jang sejogyanja dipilih. Abstract. The Application of Interregional Linear Programming is relatively a new technique of analysis (Birowo 1965). This paper attempts to apply this technique in Indonesia where agriculture land use is dominant, assuming a certain field-crops being planted. In this scheme what is worth to note is the method and model of analysis. It is an endeavour to incorporate variables such as  transportation, fertility of land and cost of production in the framework of the model. The result expected, is a proposal of land use pattern, in certain field crops, which is thought to be preferred.
Origin of Lake Singkarak in the Padang Highlands (Central Sumatra) M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 5 No. 1 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Since long it has been accepted that Lake Singkarak in the Padang Highlands is nothing else but a remnant of a gigantic volcano-the Singkarak volcano- which one blew off its top to form a lake. Van Bemmelen though not referring to Singkarak Lake especially, explained the numerous depressions in Sumatra as the combined result of volcanic and tectonic activities, a phenomenon he called volcano-tectonic process which caused the formation of the so called volcano-tectonic depressions.A short visit to the lake area in the months of February and March (1970) convinced the author that the Singkarak Lake is neither a volcanic ruin nor a volcano-tectonic depression in the sense of Van Bemmelen.Faulting evidences, morphology and the position of the Singkarak trough plus the distribution of volcanic products north and south of the lake lead to the conclusion that the Singkarak trough is a depression making part of the 1650 km graben zone which stretches from Sumatra's northern tip until the Semangko valley in the SE. Field evidences suggest that the lake results from a damming process by volcanic material produced by the Marapi-Singgalang-Tandikat volcanoes in the north and by the products from the Talang volcano in the south. 

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