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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. 8 No. 1 (1974)" : 3 Documents clear
Determination of Surface Finish Quality of Metals By Means of Optical Methods Ariono Abdulkadir; Richard C. Birkebak
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Determination of surface - finish quality is done by measurements of its rms. Values of surface roughness and slopes. Mechanical measurements of these properties are done by using a profilometer. This method, however, is limited to surface having asperities larger then the size of the profilometer's tip and is of destructive type of testing. Alternate techniques using optical method based on the theories of Davies and Beckmann are presented. The instrumentation used was a double - beam, modified Perkin-Elmer 621 Spectrophotometer. Results using several randomly roughened metallic surface show good agreement with the existing theory and experimental results.Abstract. Pengukuran kekasaran permukaan-permukaan logam biasanya dilakukan dengan menentukan harga rms. dari  seluruh distribusi jarak dari lembah kepuncak beserta orientasi dari setiap faset yang membentuk kekasaran permukannya. Pengukuran kebesaran-kebesaran ini secara mekanis dilakukan dengan mempergunakan profilometer. Akan tetapi, metoda ini terbatas untuk permukaan-permukaan yang ukuran ujung jarum profilometer yang dipakai; lagipula metoda ini termasuk dalam jenis yang disebut "destructive testing". Tulisan ini menguraikan suatu alternatip dengan memakai metoda secara optis dan mempergunakan teori-teori Davies dan Beckmann. Instrumentasi yang dipergunakan ialah suatu Perkin-Elmer 621 Spectrophotometer dengan sistim sinar rangkap dan yang telah dimodifikasikan. Hasil-hasil yang diperoleh dengan mempergunakan berbagai jenis logam yang permukannya telah dikasarkan secara sebarang memberikan kecocokan yang cukup baik bila dibandingkan dengan teori dan hasil-hasil eksperimentil yang ada hingga saat ini.
Tondano Pyroclastic M.T. Zen; Muziel Alzwar
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. Recent A recent investigation into the volcanic geology of Minahasa revealed the existence and distribution of pyroclastic flow sheets of which origin and mode of emplacement are yet to be solved. These pyroclastic flow sheets are found covering nearly whole Minahasa. It consists of loose to dense tuff or tuffaceous material, containing angular, to subangular and rounded pumice fragments measuring from a few mm to 15-20 mm across, showing several cycles of deposition. Welding is only detected at one spot and very limited. Quartz fragments are common but not abundant. Along the lake of tondano those pyroclastics form terraces ranging in height from 1.5 to 20 m, whereas farther away along the North and the South east these pyroclastic sheets form typical soft undulating landscapes. Most probably these pyroclastics originated from fissure like eruptions in a longitudinal riftvalley on the crest of the Minahasa geanticline bordered to the SE by the slightly crescentic Lembean scarp, and to the NW by a row of young volcanoes. Some of the pyroclastics might have deposited aerially some showed some indication of flowage after deposition. In Central and East Minahasa most part of these pyroclastic sheets are covered by young and recently produced volcanics of andesitic composition. The magnitude of this deposit makes it necessary to be mapped as a separate unit and the regional mapping team of the Geological Survey of Indonesia should pay considerable attention to their presence and geologic importance, since, next to Toba this pyroclastic deposit is one having the largest surface distributionRingkasan. Suatu penelitian pendahuluan di daerah Minahasa baru-baru ini menemukan penyebaran suatu batuan pyroklastika secara luas sekali. Batuan ini dapat digolongkan sebagai "pyroclastic flow sheets" sedangkan asal usul endapan ini secara terperinci belum dapat diketahui dengan jelas. Endapan ini terdiri dari batuan tufa padat maupun tufa lepas dengan fragmen batu apung berbentuk angular ataupun bundar dengan diameter berkisar antara 15 hingga 20 cm. Endapan tersebut memperlihatkan ciri-ciri pengendapan bersiklus. Gejala "welding" hanya diketemukan pada satu tempat dan itupun secara sangat terbatas. Fragmen mineral kwarsa juga tampak tetapi tidak terlalu banyak. Disekitar danau Tondano, disebelah Barat Daya, endapan tadi membentuk teras-teras dengan ketinggian 15-20 meter sedangkan jauh di pantai Utara dan Selatan endapan tadi membentuk bentang alam ber-undulasi yang lemah. Besar kemungkinan endapan tadi berasal dari letusan-letusan yang terdapat pada puncak geantiklin Minahasa yang dibatasi pada sebelah Timur oleh "Lembean Scarp", sedangkan disebelah Barat ia dibatasi oleh deratan kerucut gunung-gunung berapi muda. Sebagian dari endapan pyroklastik tadi mungkin diendapkan dari udara, sebagian mengalami proses aliran sesudah diendapkan dari udara. Di Minahasa Tengah dan Minahasa Timur sebagian dari endapan pyroklastik tadi ditutupi oleh bahan-bahan volkanik berkomposisi andesit. Karena endapan tadi sangat luas, endapan-endapan tadi mungkin perlu dipetakan sebagai satuan terpisah, oleh karena itu perlu diperhatikan oleh team pemeta Direktorat Geologi. Sesudah Toba mungkin endapan pyroklastik Tondano adalah endapan terbesar di Indonesia.
The Effect of Insecticide Endrin on Soybean Root Nodules Bacteria Rhizobium japonicum U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. The effects of Endrin on soybean root nodules baccteria Rhizobium japonicum has been studied. In pot experiments with soybean and addition of Endrin gave no quantitative change of these bacteria during any part of the vegetation period, Rhizobium japonicum strains have been isolated from Endrin treated soil. These cultures grew fairly well in medium with Endrin as the sole source of carbon. Ringkasan. Telah diselidiki pengaruh insektisida Endrin terhadap bakteri nodula akar kacang kedele Rhizobium japonicum. Ternyata dalam percobaan dengan menggunakan pot yang disertai penambahan Endrin, tidak memberikan perubahan jumlah dari bakteri tersebut selama pertumbuhan kacang kedele. Strains Rhizobium japonicum dapat dipisahkan dari tanah-tanah yang diberi perlakuan Endrin. Biakan-biakan dari bakteri tersebut tumbuh baik pada media yang diberi penambahan Endrin sebagai sumber C.

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