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Journal of Mathematical and Fundamental Sciences Vol. 5 Issue 1 1970

Vol. 5 No. 1 (1970)

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Origin of Lake Singkarak in the Padang Highlands (Central Sumatra)

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…

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Penentuan Penggunaan Tanah Pertanian dengan Programming Linier Antardaerah

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…

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