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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 689 Documents
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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.
Anatomites brochiiformis Welter var. rotundata Tjia Hong Djin
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 1 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

DARI FOSIL-FOSIL CHEPALOPODA JANG TELAH DIKUMPULKAN di Basleo. Timor, oleh salah satu espedisi geologi dari Fakultas Ilmu Pasti dan Ilmu Alam, Universitas Indonesia di Bandung, beberapa telah diselidiki, antara lain species Anatomites brochiiformis. Untuk spesies ini, dua varian dapat ditentukan : ialah Anatomites brochiiformis var.rotundata jang mempunjai mulut dengan tinggi lebih ketjil  daripada lebar, dan Anatomites brochiiformis var. elongata jang mempunjai mulut dengan tinggi lebih besar daripada lebar. 
Coriolis Concept : Useful or Not? John A. Feyk
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 1 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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GAJA CORIOLIS DI SINI DIURAIKAN SECARA KWALITATIP. Perhitungannja didasarkan pada sistem salib sumbu-sumbu jang tetap dan lagi atas sistem salib sumbu yang bergerak (gaja coriolis). Diterangkan bahwa tjara dengan memakai sumbu jang tetap ini, adalah lebih mudah daripada tjara dengan perhitungan coriolis jang matematis komplex. Effek coriolis adalah menarik sekali, karena ini dapat memberi kesan yang salah, umpamanja untuk seorang pengamat satelit dari bumi. Djalan yang ditempuh satelit sesungguhnja terletak dalam bidang datar, tetapi si pengamat tadi melihatnja sebagai djalan lengkung. 
The Behaviour of Blood Chloride During Osmo-regulation in the Sawahcrab (Paratelphusa Conveka) Lim Lian Nio
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 1 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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PARATELPHUSA CONVEXA, JG MULA-MULA ADALAH CHEWAN laut dan sekarang hidup di air tawar dan djelas menggambarkan kemampuannja untuk memelihara komposisi darahnja dalam berbagai matjam keadaan sekitarnya (osmoregulasi).Bila ketam sawah itu dibiarkan di dalam air suling, maka mula-mula kadar chlorida di dalam darahnja menurun tetapi kadar chlorida tersebut tjepat kembali seperti semula. Kedjadian ini mungkin disebabkan karena pelepasan chlorida di dalam chewan itu. Pelepasan chlorida itu mungkin dipengaruhi oleh berbagai faktor, misalnja konsentrasi total daripada sekitarnja, konsentrasi chlorida, atau konsentrasi daripada ion-ion lainnja. Banjak dari kemungkinan-kemungkinan itu telah ditjoba dengan memakai tjampuran-tjampuran garam  buatan dan kadar chlorida dalam darah telah ditentukan setjara kwantitatip (micro Volhard). Ternjata turunnja chlorida darah dalam air suling itu tidak hanja disebabkan karena kekurangan kadar chlorida. Faktor-faktor jang sesuai sudah diselidiki  dan hubungan kwantitatip antara kadar chlorida darah dan pelepasan chlorida telah dianalisa. 
Laporan Sementara Mengenai Geologi Daerah Ombilin Pesisir Utara Danau Singkarak John Katili; Kamal Kamal
Journal of Mathematical and Fundamental Sciences Vol. 1 No. 1 (1961)
Publisher : Institute for Research and Community Services (LPPM) ITB

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DETAILED GEOLOGICAL MAPPING WAS CARRIED OUT IN THE OMBILIN AREA, North of Lake Singkarak in order to study more closely the Late Palaeozoic_Early Mesozoic volcanic sedimentary deposits known as the Silungkang formation, the Triassic and the so-called Pre-Permian granite of Guguk Bulat. Some fusulinas of the Silungkang formation were determined and considered to be as Permian age*.The Silungkang formation is correlated with similar sedimentary volcanic series of Gk. Gie Sie Top Top and the Lake Air Tawar of North Sumatra. Field investigations have revealed that a part of the limestone in the upper stream of the river Lurah Tambang does not belong to the Triassic, but to the Silungkang formation. Furthermore it became evident that the Pre-Premian granite does not exist, on the contrary we have to consider the arkosic rock of Guguk Bulat  as a part of the Tertiary quartzstandstone formation, resulting from weathering of a younger granite, possibly Cretaceousin age. The quartzdiorite which occurs as small bodies between the granite and the Pre-Tertiary volcanic products, is considered as altered andesitic rocks of the Silungkang volcanic series, caused by the formation of granites.*) The determination was done by MARKS, former lecturer in palaeontology, of the faculty of Science, University of Indonesia, Bandung  
A Predictor-Corrector Scheme for Conservation Equations with Discontinuous Coefficients Nasrin Okhovati; Mohammad Izadi
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 3 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.3.6

Abstract

In this paper we propose an explicit predictor-corrector finite difference scheme to numerically solve one-dimensional conservation laws with discontinuous flux function appearing in various physical model problems, such as traffic flow and two-phase flow in porous media. The proposed method is based on the second-order MacCormack finite difference scheme and the solution is obtained by correcting first-order schemes. It is shown that the order of convergence is quadratic in the grid spacing for uniform grids when applied to problems with discontinuity. To illustrate some properties of the proposed scheme, numerical results applied to linear as well as non-linear problems are presented.
Cover Vol. 50 No. 3, 2018 Journal of Mathematical and Fundamental Sciences
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 3 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Front Matter Vol. 50 No. 3, 2018 Journal of Mathematical and Fundamental Sciences
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 3 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Back Matter Vol. 50 No. 3, 2018 Journal of Mathematical and Fundamental Sciences
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 3 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

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