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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
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Search results for , issue "Vol. 12 No. 1 (1979)" : 3 Documents clear
Recycling of Cast Iron Chips by Powder Metallurgy D.N. Adnyana
Journal of Mathematical and Fundamental Sciences Vol. 12 No. 1 (1979)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The utilization of cast iron chips as an alternative cheaper raw material in the powder metallurgy industry is currently undergoing development to produce useful products. The present work is concerned with the technology and economy of such as alternative powder processing technique. The mechanical properties of grey cast iron are primarily determined by the proportion of included graphite in the metallic matrix in which the graphite also affects the properties of powdered cast iron chips. The influences of the processing technique on the powder characteristics such as the shape, the size, the loose graphite as well as the subsequent route of compacting and sintering are described. In sintering, the effects of the protective atmosphere used on the properties of sintered compact are discussed. Sari. Penggunaan geram (sisa-sisa pengerjaan) dari besi tuang sebagai bahan baku murah di dalam industry puder metallurgi (logam dalam bentuk serbuk (puder)), kini sedang berkembang untuk membuat produk-produk yang bermanfaat. Di dalam studi ini yang diperhatikan adalah segi-segi teknik dan ekonomi dari proses-proses pembuatan puder. Sifat-sifat mekanis besi tuang kelabu pada dasarnya ditentukan oleh jumlah kandungan grafit di dalam matrik, yang mana kandungan grafit dari besi tuang ini juga mempengaruhi kepada sifat-sifat pudernya. Tulisan ini menguraikan pula tentang pengaruh dari teknik pembuatan puder terhadap : sifat-sifat puder seperti bentuk, besar dan grafit yang terlepas dari matrik dan demikian pula terhadap proses-proses pengepresan dan penyinteran. Didiskusikan pula mengenai pengaruh dari gas yang digunakan untuk proses penyinteran terhadap sifat-sifat produk yang telah disinter.
Hubungan Antara Besar Butir dengan Kekuatan dan Kekerasan pada Aluminium Paduan Berbutir Kasar Harsono Wirjosumarto; Rudy Setyo Purnomo
Journal of Mathematical and Fundamental Sciences Vol. 12 No. 1 (1979)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Hubungan Hall-Petch, σt = σi + KD-1/2 diteliti kembali dengan menggunakan aluminium paduan berbutir kasar, besar butir antara 0,069mm dan 0,404 mm, sebagai bahan uji. Hasil penelitian menunjukkan bahwa harga konstanta K dari perhitungan teoritik dan dari percobaan mempunyai kesesuaian yang tinggi, yaitu perhitungan teoritik K = 0,0514 dan percobaan K = 0,052; tetapi harga eksponen dari percobaan bukannya -0,5 melainkan -1,86. Hubungan antara kekerasan dan kekuatan hasil percobaan sesuai dengan hasil perhitungan teoritik, yaitu hubungan garis lurus dengan konstanta hasil percobaan C = 0,335 sedangkan perhitungan teoritik C = 0,35 ÷ 0,39. Dengan hasil ini hubungan tersebut untuk aluminium menjadi σt = 0.335 BHN. Butir-butir aluminium yang berlainan besarnya dihasilkan dengan cara regang-anil dengan merubah temperature anil pada harga regang dan waktu anil yang sama.  Abstract. Hall-Petch relation, σt = σi + KD-1/2, is re-examined and tested to a coarse grain aluminum alloy with grain size between 0.069 mm and 0.404 mm. The result indicates that the theoretical and experimental value of K match each other closely, i.e. Kth = 0.0514 and Kexp = 0.052. 0n the other hand the experimental value of the exponent is -1.86 instead of -0.5. The experimental relation between hardness number and strength matches reasonably well to the theoretical analysis, which is linear. The experimental value of the linearity constant is Cexp = 0.335 and the theoretical constant is Cth= 0.35 ÷ 0.39, therefore this aluminum alloy the relation is σt = 0.335 BHN. The grain size difference of the specimen was obtained by strain-annealed method by varying the annealing temperature at constant strain and annealing time.
Effects of Industrial Waste Effluent on Soil Microflora and Rice Plants U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 12 No. 1 (1979)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Industrial waste effluents, particularly from chemical industries, causes pollution. Like other chemical industries, the Letjes Paper Mill (Probolinggo), produce approximately 800 cubic meters of waste effluents per hour, which is directly discharge into the immediate surroundings without any treatment beforehand. The present study was, therefore, undertaken to determine the effects of continous dischargal of the Letjes Paper Mill waste effluents on soil microflora and rice plants. Sari. Buangan industry, terutama dari industri kimia, merupakan penyebab pencemaran. Seperti pula industry kimia lainnya, Pabrik Kertas Letjes (Probolinggo), menghasilkan lebih kurang 800 meter-kubik air-buangan setiap jamnya, yang langsung dibuang ke lingkungannya tanpa pengolahan terlebih dahulu. Penelitian ini dimaksudkan untuk mengetahui efek dari air bunangan Pabrik Kertas Letjes yang dibuang terus-menerus, terhadap mikroflora tanah dan tanaman padi.

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