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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. 1 No. 2 (1961)" : 4 Documents clear
Note on a Possible OB Association in Scorpius Pik Sin The
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 2 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

During a survey of Hα-emission stars, a clustering of OB  and A-type stars was noticed in the constellation Scorpius.  It is believed that these stars form a new association extending in R.A. from 17h00m to 17h16m (1900) and in Dec. from -31°30' to -34°30' (1900). The distance to this association is probably 1400 psc.In the course of recent survey of Hα-emission stars (1) in the vicinity of the emission nebulosities NGC 6334 and NGC 6357, the author noticed a clustering of Hα-emission stars to the north of dark nebula.  This nebula is believed to form a connection between the two emission nebulae. The group of Hα-emission stars is centered about the Hα-emission stars HD 155806 (R.A.= 17h08.m7, Dec.=-33Ëš26';1900), which is classified as Oe5p in the Henry Draper extension, while in the Henry Draper Catalog it is classified as B3p.A total of 13 Hα-emission stars were found in circular area of 1,5 degree radius, centered on the star HD 155806. Two of these stars are of late spectral type, six are early spectral type, and the remaining five are too faint to classify on both red and blue plates. They might possibly be T-Tauri type star, as may also be the case for the faint Hα-emission stars which are seen projected on the dark nebulosity mentioned above.It is well known that T associations are sometimes found together with OB associations. In order to determine whether or not an OB associations exists together with the above mentioned possible T association, the author made a preliminary search for such an association in circular area of one degree radius centered on the star HD 155806. Chart No. 180 in the Henry Draper Extension was used for this survey. Within the prescribed area,  49 OB-Type and 85 A-type stars were found.The corresponding surface densities are thus 15.6 and 27.0 stars per square degree
The Laplace Transform of Vector-Valued Functions Moedomo Soedigdomarto
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 2 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Teori klasik dari transformasi Laplace-Stieltjies, telah diperluas oleh E.  Hille l4l untuk fungsi-fungsi pada [0,∞] ke dalam ruang Banach X jang mempunjai sifat bahwa setiap bilangan positip R, dengan supermum yang diambil terhadap semua koleksi-koleksi hingga {[rj, tj]}j=1 dari sub-interval2  lepas dari [0,R]. Setelah itu S.Zaidman (8) menyelediki hal jang serupa untuk fungsi-fungsi Î± jang bersifat kumpulan2 variasinya V ([0,R], Î±) jaitu koleksi semua elemen dari X jang berbentuk, merupakan sub kumpulan jang kompak di X.Karangan ini membitjarakan kemungkinan untuk membangun teori transformasi Laplace-Stieltjes untuk fungsi2 jang sifat2nja lebih umum daripada  fungsi2 jang dipeladjari oleh Hille dan Zaidman. Ternjata bahwa banjak hukum2 jang berlaku untuk transformasi fungsi dengan harga scalar berlaku djuga di sini.Perhitungan absis konvergensi Ïƒc(α) dapat dikerdjakan serupa dengan perhitungan untuk fungsi2 berharga scalar (lihat [6]), dan begitu pula dengan hukum2 yang berhubungan dengan analistas berlaku di sini.Suatu hal yang menarik ialah bahwa rumus inversi, dengan a > max [0, Ïƒc(α)] tidak berlaku tanpa sjarat tambahan jang harus dipenuhi oleh fungsi Î±,Demikian Hille telah membuktikan bahwa rumus inversi di atas berlaku bila Î± mempunjai variasi  jang terbatas absolute pada setiap interval jang hingga, sedangkan Zaidman mempergunakan sjarat tambahan bahwa pada variasi Î± pada setiap interval hingga adalah kompak.Ternjata bahwa kedua sjarat di atas dapat diperlunak mendjadi sjarat bahwa variasi Î± pada setiap interval jang hingga harus kompak dalam topologi lemah dari X.Lagipula, rumus inverse akan berlaku tanpa syarat untuk Î± , asal ruang X adalah lengkap-lemah, chususnya bila X refleksif. Hasil ini kami dasarkan atas karya Bartle, Dunford, dan Schwartz.
Environmental Radioactivity in Bandung Area Suwarno Wirjosimin
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 2 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Penulis bersama-sama anggota Group Health Physics jang sedang mendapat pendidikan di bawah pimpinan Health Physicist dari IAEA, R.E. Alexander, telah melakukan pekerdjaan survey di sekitar kota Bandung. Survey ini adalah sebagai pendahuluan dari program survey yang kelak dilakukan setjara teratur, berhubung akan didirikannja projek reaktor  inti di ITB. Maksud dari survey pendahuluan ini ialah untuk mendapatkan data dari tingkat radioaktiva dalam air, tanah, tumbuh-tumbuhan dan udara sebelum reaktor berdjalan, sehingga memungkinkan untuk mendapatkan perbandingan jang djelas djika kelak reaktor sudah berdjalan. Dengan alat-alat djang sangat terbatas jang terdapat di bagian Fisika dan di ITB pada dewasa ini, telah ditjoba untuk mendapatkan hasil jang sebaik-baiknja. 
The System of Gelled Foam of Clay-in-water Suspension for the Preparation of Lightweight Insulating Refractory: Part I. Formation and Gelling of Clay-Based Foam Iman Nazeni
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 2 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Under neutral conditions colloidal plates of clay in water are negatively charged. When the pH of the clay-in-water dispersion is lowered slightly, positive charges can develop on the edges of the clay plates giving rise to an edge-to-face type gelation. Sodium fluosilicate, which has a rather high acidity and which is very slightly soluble in water, can be used as gelling agent. By beating a clay slip containing, a surfaceactive agent "Teepool" and sodium fluosilicate, one can obtain a stable foam followed by formation of a firm gel. When then the wet gel is dried a solid foam product is built up.

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