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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 4 Documents
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Search results for , issue "Vol. 6 No. 3 (1972)" : 4 Documents clear
Photographic Photometry of NGC 6866 B. Hidajat; W. Sutantyo
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 3 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Magnitudes and colors in the UBV photometric system have been determined for 575 stars in and around NGC 6866. The color-color relation of the cluster stars provides an estimate of interstellar reddening of 0.16 mag. The distance of cluster is found to be 1336 pc. The age, as determined from the evolutionary deviation curve, is approximately 2.5 x 108 years.  Ringkasan. Magnitudo dan warna dalam sistim UBV-photometri untuk 575 buah bintang disekitar NGC 6866 telah diukur setjara photographi-photometri. Excess warna, jang diturunkan dari diagram warna-warna, telah ditentukan sebesar 0.16 magnitudo. Djarak gugus bintang tersebut diperkirakan 1336 pc. Dari kurva evolusi diketahui bahwa umur gugus tersebut 2.5 x 108 tahun. 
The Origin of Several Pyroclastic Plateaux in the Padang Highlands (Central Sumatra) (Preliminary Paper) M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 3 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Several pyroclastic plateaux are known in the Padang Highlands. Westerveld (1952) suggested that those rhyolitic volcanics are sheetlike deposits of paroxysmal fissure eruption similar to the incandescent clouds of the Katmai type. Field observation, however, suggested that at least the pyroclastic plateau of Bukit Tinggi might as well be the result of an air borne tuff deposition which originated from a gigantic outburst of the Manindjau volcano prior to its caldera formation. The tuff plateau of Bukit Tinggi, as revealed by the exposures in Ngarai SiAnok, is neither layered nor welded and could not be deposited in water either. The landscape between Matur and Bukit Tinggi gives the impression as if ducoed by tuff from the air.  Ringkasan. Beberapa daratan jang terbentuk dari bahan pyroklastik dikenal di Daratan Tinggi Padang. Menurut Westerveld (1952) dataran2 tinggi tersebut jang terdiri dari batuan volkanik bersifat rhyolitik merupakan endapan pyroklastik terdiri dari lembaran2 (sheetlike) dan dihasilkan oleh suatu erupsi rekahan jang sama sifatnja dengan endapan awan panas dari Gunung Katmai di Alaska. Penelitian lapangan, sebaliknja, lebih menundjukkan bahwa dataran2 tinggi tadi, terutama Dataran pyroklastik Bukit Tinggi, mungkin sekali berupa endapan pyroklastik dari udara jang dikeluarkan oleh letusan raksasa Gunung Manindjau pada saat2 mendjelang ambruknja gunung tersebut untuk membentuk kaldera Danau jang besar itu. Dataran Tinggi tufa Bukit Tinggi, sebagaimana terlihat pada singkapan2 jang djelas di Ngarai Si Anok, tidak memperlihatkan perlapisan dan djuga tidak memperlihatkan "welding". Endapan tufa tersebut djuga tidak mungkin diendapkan diair. Bentang alam antara Matur dan Bukit Tinggi memberi kesan se-akan2 di-"duco" dari udara oleh tufa.
Rhizosphere Cyanophyceae of Soybean Inoculated with Rhizobium Japonicum U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 3 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. A study has been made of the species of Cyanophyceae occurring in the rhizosphere and nonrhizosphere regions of soybeans in pot culture under glasshouse conditions. Eleven species of Cyanophyceae were detected. The algal species were not influenced in diversity by the presence of Rh. japonicum. Very few cells of only four species occurred in unplanted pots. Attention is drawn to the dearth of information available on rhizosphere algae and to their likely importance for the heterotrophic populations.  Ringkasan. Penelitian terhadap species Cyanophyceae jang terdapat didaerah rhizosphere dan nonrhizosphere akar kedele, telah dilakukan dalam kondisi rumahkatja dengan menggunakan pot. Sebelas species Cyanophyceae telah didapatkan. Kehadiran Rh. japonicum ternjata tidak mempengaruhi diversitas species gang-gang. Hanja empat species dalam djumlah jang sangat sedikit, didapatkan pada pot tanpa kedele. Perhatian sangat ditundjukan karena kurangnja informasi mengenai ganggang didaerah rhizosphere, serta kepentingannja didalam populasi jang heterotropis.
Matriks Fundamental II Achmad Arifin
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 3 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Ringkasan. Suatu matriks kwadratis kita katakana fundamental djika ia simetris dan setiap submatriks utamanja mempunjai deretminan jang positif. Misalkan f suatu bentuk bilinier pada suatu ruang vector berdimensi hingga atas lapangan riil, dan f berkoresponensi dengan suatu matriks G. kita buktikan, bahwa f suatu hasilkali-dalam djika dan hanja djika G fundamental.Abstract. We define a square matrix to be fundamental if it is symmetric and all its principal submatrices have positive determinants. Let f be a bilinear form on finite-dimensional vector space over the real field which corresponds to a matrix G. We prove that f is an inner-product if and only if G is fundamental. 

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