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INDONESIA
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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A Simple Intermolecular Model Used to Study Interfaces Filino Harahap
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 1 (1971)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Flachsbart and Anliker (1) used a simple molecular model to study the effect of gravity on the contact angle and the interface shape. Here, the problem is extended by considering the solid body rotation of a constant volume liquid in a pan. The effect of the centrifugal body force is included in an attempt to study dynamic effects on the contact angle. It was found, that the contact angle is not dependent upon the included body forces as far as the order of approximation of the analysis is concerned. The microscopic structure of the gas-liquid interface, which is involved in the problem considered, the structure of the surface tension and the contact angle are presented. 
Penentuan Penggunaan Tanah Pertanian dengan Programming Linier Antardaerah Budhy Tjahyati Sugijanto
Journal of Mathematical and Fundamental Sciences Vol. 5 No. 1 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Penggunaan Linear Programming Antardaerah (Interregional Linear Programming) sebagai teknik analisa, adalah relatif sangat baru (Birowo 1965). Di Indonesia dimana luas penggunaan tanah untuk pertanian adalah dominan, ditjoba untuk diadakan prediksi mengenai tata penggunaan tanah jang maximum, dengan pengandaian penanaman beberapa djenis tanaman pertanian (field crops). Dengan demikian perlu suatu metode dan model kerangka analisanja. Jang penting untuk ditondjolkan disini adalah persoalan transport, kesubutan tanah dan biaja penanaman sebagai variable dalam model ini. Hasil model ini adalah suatu usul luas2 tanah untuk tanaman pertanian tertentu, jang sejogyanja dipilih. Abstract. The Application of Interregional Linear Programming is relatively a new technique of analysis (Birowo 1965). This paper attempts to apply this technique in Indonesia where agriculture land use is dominant, assuming a certain field-crops being planted. In this scheme what is worth to note is the method and model of analysis. It is an endeavour to incorporate variables such as  transportation, fertility of land and cost of production in the framework of the model. The result expected, is a proposal of land use pattern, in certain field crops, which is thought to be preferred.
Origin of Lake Singkarak in the Padang Highlands (Central Sumatra) M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 5 No. 1 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Since long it has been accepted that Lake Singkarak in the Padang Highlands is nothing else but a remnant of a gigantic volcano-the Singkarak volcano- which one blew off its top to form a lake. Van Bemmelen though not referring to Singkarak Lake especially, explained the numerous depressions in Sumatra as the combined result of volcanic and tectonic activities, a phenomenon he called volcano-tectonic process which caused the formation of the so called volcano-tectonic depressions.A short visit to the lake area in the months of February and March (1970) convinced the author that the Singkarak Lake is neither a volcanic ruin nor a volcano-tectonic depression in the sense of Van Bemmelen.Faulting evidences, morphology and the position of the Singkarak trough plus the distribution of volcanic products north and south of the lake lead to the conclusion that the Singkarak trough is a depression making part of the 1650 km graben zone which stretches from Sumatra's northern tip until the Semangko valley in the SE. Field evidences suggest that the lake results from a damming process by volcanic material produced by the Marapi-Singgalang-Tandikat volcanoes in the north and by the products from the Talang volcano in the south. 
On the Stratigraphic Positionof Pithecantropus Mandible- C. S. Sartono
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 4 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Up to now almost all of Java's Early as well as  Middle Pliestocene hominids are surface finds. As a result, the relative age of determinations of these specimens are matters of speculations. Pithecantropus C is also a surface find and obtained from the surface of the Lower Pleistocene Putjangan beds from the Sangiran area (Central Java, Indonesia). Within the encrusting matrix of the Pithecantropus mandible have been collected a fauna of smaller foraminifera. Based on comparison of this faunal assemblage with the faunal associations of small foraminifera from the Putjangan beds, the stratigraphic position of the mandible can be established and in this way its relative age is supposed to be Late Lower Pleistocene. Ringkasan. Hampir semua fosil-fosil hominidae berumur Plestosen Bawah dan Plestosen Tengah dipula Djawa merupaka penemuan-penemuan dipermukaan tanah. Hal ini menjebabkan penentuan umur relatip fosil-fosil itu suatu hal jang spekulatip. Pithecanthropus C merupakan pula suatu penemuan diatas permukaan tanah dari lapisan-lapisan Putjangan diderah Sangiran (Djawa Tengah, Indonesia) jang berumur Plestosen Bawah. Didalam batuan jang melekat pada rahang bawah Pithecanthropus itu terdapat fauna foraminifera ketjil. Berdasarkan perbandingan antara fauna foraminifera ketjil ini dengan fauna foraminifer ketjil jang terdapat didalam lapisan-lapisan Putjangan diatas, maka dapatlah ditentukan posisi stratigrafi rahang bawah itu didalam lapisan-lapisan Putjangan tersebut, sehingga dengan demikian dapat diperkirakan bahwa umur relatip Pithecanthropus C itu adalah Plestosen Bawah Muda.
Tjatatan Mengenai Beberapa Hama Padi dari Indonesia Soelaksono Sastrodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 4 (1970)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Dari sedjumlah besar binatang jang berpotensi sebagai hama, hanja terdapat kurang dari sepuluh species jang betul-betul mempunjai arti ekonomi (hama). Penggerek batang (Tryporyza), walang sangit (Leptocirisa) dan tikus (Rattus) merupakan tiga hama utama dari padi. Ketiga hama ini dan hama padi lainnja jang kurang penting terdapat didaerah sawah diseluruh Indonesia. Penggerek batang seringkali mendjadi wabah (outbreaks) terutama didaerah utara dari pulau Djawa. Tikus mendjadi wabah baik didataran rendah maupun didataran tinggi, sedang "outbreaks" dari walang sangit terbatas didaerah utara Djawa Barat. Sebagai patokan dari "outbreaks" dipakai angka kerusakan 5000 IIA tanaman padi. Abstract. There are less than ten important rice crop pests out of a large number of general known pests. Rice stem borers (Tryporyza), rice bugs (Leptocorisa) and field rats (rattus) caused serious damages on rice crops. These three important pests and other less important ones were found at rice fields throughout Indonesia. The outbreaks of rice stem borers occurred at the northern part of Java almost yearly. The outbreaks of field rats were more widespread either at lowland or highland, whereas the outbreaks of the rice bugs were restricted to the northern part of West Java. The adapted value for outbreaks was 5000 HA damages on rice crop.
Infrared Survey of Giant M Stars Bambang Hidajat
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 3 (1969)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. A spectrocospic survey in an area of 5 squares degrees, located in the general direction of the Palomar-Groningen Variable-Star Field 2 , yields 263 Giant M stars. A test of completeness shows than the survey was complete down visual magnitude 16 for early giant M stars and to visual magnitude 17 for late giant M stars. The space density distribution of the stars is presented.Ichtisar. Survey setjara spektroskopis bintang raksasa M, didaerah seluas 5 deradjat persegi, kearah Palomar-Groningen Variable-Star Field no. 2, menghasilkan 263 bintang2 raksasa kelas M. Sebuah test statistic menundjukkan bahwa survey tersebut lengkap sampai magnitude 16, untuk bintang M-azeal, dan sampai magnitude 17, untung bintang2 M-tua. Distribusi bintang2 tersebut didalam ruang djuga dihitung dan dibitjarakan.
Some Ambiguous Features for Geologic Interpretation H.D. Tjia
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 3 (1969)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Among geologic features, which do not indicate phenomena claimed by textbooks, are triangular facet developed on steeply inclined dipslopes, sensation of coarseness that does indicate the sense of fault displacement, and orientation of long pebble-axes perpendicular to transport direction, examples of these features are demonstrated.Ichtisar. Penulis telah mendjumpai beberapa gedjala geologi jang mempunjai arti berlainan dari pada jang biasa dikemukakan oleh "tectbooks"; antara lain ditemukan facet-facet segitiga jang terbentuk pada dipslope tjuram, kesan kasar sepandjang slickendside jang menundjukkan arah gerak sesar, dan sumbu-sumbu memandjang dari batuguling jang berkedudukan tegak terhadap arah pengangkutan. 
The Study of Insect Population S. Sastrodihardjo; Adianto Adianto; Liem Khian Kioe
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 3 (1969)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Insect population has been subjected to several environmental factors. Included within this environmental category are the type of food, the place to live in, the climatic conditions, etc. This study has been leading to seek of key factor in the regulation of several insect populations. First, the population of APHIS GOSSYPII on cotton plants. It is apparent that the physiological condition of the leaves is the primary regulating factor. Secondly, the size of the population depends also on the food from which the energy came. Corn meal supported large population of TRIBOLIUM CASTANEUM, followed by soy meal, rice meal, and katjang idjo (green bean) meal. However corn meal plus rice meal plus milk powder (45:45 :10), supported the largest size of TRIBOLIUM population; the fluctuation occurred on the level of 300 individuals per 10 grm medium. Furthermore, BRUCHUS PHASEOLI (another insect pest) refused to oviposit on katjang idjo meal, but thrived on katjang idjo bean. This behavioural factor is believed to be the primary regulating factor. The quality of the bean and also the thickness of the skin may further regulate the population. Finally the climatic factor effected the behavior as well as the life-cycle of several insects  caught in the vicinity of ITB campus. Ichtisar. Populasi serangga selalu terkena oleh pengaruh factor keliling. Termasuk didalam category faktor keliling ini adalah djenis makanan, tempat untuk hidup, keadaan iklim tsb. Studi ini telah mengarah kepada pentjaharian "key-faktor" jang mengatur beberapa matjam populasi serangga. Pertama-tama mengenai populasi dari APHIS GOSSYPH pada tanaman kapas. Tampak njata bahwa keadaan faali dari daun adalah factor pengatur utama. Kedua, besar dari populasi tergantung djuga dari matjam makanan dari mana energi diperoleh. Tepung djagung dapat menjokong suatu populasi besar dari TRIBOLIUM CASTANEUM, diikuti oelh tepung kedele, tepung beras dan tepung katjang idjo. Populasi TRIBOLIUM jang terbesar didapatkan pada tjampuran tepung djagung, tepung beras dan bubuk susu (45 : 45 : 10); fluktuasi terdapat disekitar 300 individu per 10 grm. Medium. Selandjutnya, BRUCHUS PHASEOLIS tidak mau bertelur pada tepung katjang idjo, tetapi dapat berlipat ganda pada bidji katjang idjo. Factor kelakuan ini diperkirakan adalah factor regulator utama. Kwalitas dari katjang2an dan tebal dari kulit bidji mungkin adalah factor pengatur selandjutnja. Achirnja, iklim setempat mempengaruhi kelakuan beserta siklus hidup dari beberapa serangga jang tertangkap disekitar kampus I.T.B. 
Orientasi Kristal Tunggal Paduan Aluminium 6061 Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 2 (1968)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Kawat-kawat kristal tunggal dari paduan Aluminium 6061 jang dihasilkan dengan tjara "strain-anneal", mempunjai orientasi kristal jang hampir sama dengan orientasi pengerdjaan dingin dari logam tersebut pada waktu pembuatan kawat.Abstract. Single crystal wires of 6061 Aluminium alloy, which are produced by "strain-anneal" method, nearly have the same orientation as the cold-work orientation of the wire. 
Effects of Chemical upon Electron Spin Resonance (ESR) Signals in Lettuce Seeds Eddy Noerhadi
Journal of Mathematical and Fundamental Sciences Vol. 4 No. 2 (1968)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

ESR spectrometric study of chemically treated lettuce seeds has been carried out. Solutions of HgCl2, Na2S, KOH, KCN, KBr, KF, KIO3, KIO4, KCl, KI, and K2S, as well as water and petroleum ether have been used. Germination power and respiratory activity of the same seeds have also been investigated. Boiled seeds and gamma irradiated seeds have also been studied. KI was found to be the most effective agent. Independence upon cation and pH was found. The effect of KI and KCN was found to be reversible. No correlation between respiratory activity and the number of free radicals seems to exist. Seed coat is affected first and later on the embryo is also induced by the penetrating solution. 

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