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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. 10 No. 3 (1976)" : 3 Documents clear
Beberapa Aspek Biologis Ikan Genggehek, Mistacoleucus marcinatus (C.V.) (Cyprinidae) dari Waduk Jatiluhur, Jawa Barat H.S. Hardjasasmita; T. Wiati Surjono; Hardjono Hardjono
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Penelitian mengenai beberapa aspek biologis ikan genggehek, Mystacoleucus marginatus (CV) dari waduk (danau buatan) Jatiluhur dekat Purwakarta, Jawa Barat, telah dilakukan pada tahun 1974 dan awal tahun 1975. Plankton hewani dan nabati bersama-sama dengan detritus adalah obyek-obyek makana yang sering didapat di dalam saluran pencernaan makanan ikan genggehek. Hubungan antara kematangan gonad dan panjang standar ikan menunjukkan kolerasi positip yang kuat. Telah ditentukan ukuran minimum ikan jantan dan betina yang sudah mulai dewasa atau sudah pernah berbiak; demikian pula persamaan garis regresi hubungan panjang berat. A study on some biological aspects of the genggehek fish (Mistacoleucus marginatus (C.V.)) has been carried out at the Jatiluhur man-made lake near Purwakarta, West Java, in the year of 1974 and early 1975. Zooplankton, phytoplankton and detritus are the main food objects found in the digestive tract of the genggehek fish. The maturity of the gonad has good positive correlation with the standard length of the fish. The minimum size of the nature fishes and the length-weight relation has been also determined. 
On Certain Aspect of Leaf Development in Aren (Arenga pinnata L) E.B. Hidajat; B.I. Utomo
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. In Arenga pinnata fold formation leading to the establishment of the future pinnae occurs by differential growth. During the development the abaxial ridges grow more rapidly than the axial ones resulting in a bending of the ridges to the adaxial side while the direction changes from horizontal, to oblique vertical. This leads to a crowding up of the adaxial ridges adaxial to the rachis. A covering or haut develops then extension growth of the nonplicate lamina over the adaxial ridges mentioned there by uniting them in a composite structure. The two parts fuse along the central meeting line, forming one continuous covering. The huge tubular ligule is initiated at the fourth or fifth primordium. At the 7th primordium the ligule encloses all younger leaf primordial. Its highest growth activity is reached about 2 primordia before the sword and the maximum size is held by the primordium before the latter. Penetration of the ligule by the sword initiates its disintegration in a basipetal direction, stops adaxial to the petiole base but proceeds at a slower pace ventrally. 
Oscillation Theorems for Second Order Delay Equations Sahala Nababan
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Recently, oscillation criteria for certain second order delay differential equations have been substantially studied by [2], [3], [5], and others. In this paper, we generalize and extend some of their results to a more general delay differential equation of the type (r(t)y'(t))' + F (t,y(t),y(g(t))) = 0t ≥ α > 0

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