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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. 9 No. 2 (1975)" : 3 Documents clear
Daya Antibiotika dari Micromonospora Termofilik (Actinomycetales) yang Tumbuh Secara Aktif Selama Proses Pengomposan Sampah Kota U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 2 (1975)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Genus Micromonospora termasuk salahsatu genera dari Actinomycetales yang kurang dikenal. Kehidupannya umum secara mesofilik dan termofilik, dan ditemukan di dalam tanah, air, pupuk-kandang dan kompos. Tulisan ini akan melaporkan potensi daya antibiotika dari Micromonospora yang diukur berdasarkan sifat antagonismanya terhadap bakteria.  Abstract. The genus Micromonospora belongs to one of the least-known genera of the Actinomycetales. It comprises both mesophilic and thermophilic forms and is found in soils, in water, in manure and in composts. The present paper reports on antibiotic potential of Micromonosporaas measured by its antagonism against bacteria. 
Recovery and Stacking Faults of α Ag-Sn Alloys Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 2 (1975)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. X-ray diffraction peak shift can be used to determine the recovery temperature of face centered cubic metals. Using this method is was found that filed α Ag-Sn chips recover at temperature between 100° and 200°C. The stacking fault energy was found to be decreasing with increasing tin content.  Ringkasan. Penggeseran puncak difraksi sinar-X dapat dipergunakan untuk menentukan temperatur pemulihan dari logam-logam dengan struktur kubus berpusat sisi. Dengan cara tersebut dapat ditentukan bahwa serbuk kikiram dari α Ag-Sn pulih kembali pada temperature antara 100° dan 200°C. Diketemukan pula bahwa energi salah tumpuk dari panduan-tersebut berkurang dengan bertambahnya konsentrasi timah putih.
Kriostat Nitrogen Cair untuk Difraksi Neutron Marsongkohadi Marsongkohadi; Anung Kuswono
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 2 (1975)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Diuraikan perancangan dan pembuatan suatu kriostat nitrogen cair untuk percobaan difraksi neutron. Kriostat tersebut dibuat dari stainless-steel dan tembaga, sedangkan cendelanya dari aluminium setebal 1 mm. Voluma wadah nitrogen cair adalah delapan liter, dan diisolir dari udara luar dengan dinding vacuum yang bertekanan 2 x 10-4 torr. Nitrogen cair menguap rata-rata sebanyak 1,3 liter per jam, sedangkan "cool down losses" adalah dua liter. Suhu cuplikan diukur dengan thermometer resistor karbon atau dengan thermokopel tembaga konstantan. Suatu alat untuk mengukur tinggi permukaan nitrogen cair, telah dibuat dari beberapa resistor karbon. Dengan mengisi kriostat sebanyak limabelas liter nitrogen cair, suhu cuplikan dapat dipertahankan pada 110°K, selama Sembilan jam. Abstract. The design and construction of an all-metal liquid nitrogen cryostat for neutron diffraction experiments is described. The cryostat is made of stainless-steel and copper with 1 mm thick aluminum window. The liquid nitrogen container has a volume of eight liters, and is isolated from the surrounding atmosphere by a vacuum jacket, with a pressure of 2 x 10-4 torr. The mean evaporation rate of the liquid nitrogen is 1.3 liters per hour, whereas the cool down losses is two liters. The temperature of the sample is measured with a carbon resistor thermometer or a copper constantan thermocouple. A dipmeter is constructed of several carbon resistors. By filling the cryostat with fifteen liters of liquid nitrogen, the temperature of the sample is held constant 110°K, for nine hours. 

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