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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
 1 
Search results for , issue "Vol. 4 No. 3 (1969)" : 3 Documents clear
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. 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

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

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. 

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