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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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The dB and gK Stars Near the Direction of the Galactic Center B. Hidajat; I. Radiman
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 2 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. An objective prism survey of the Palomar-Groningen Variable-Stars Field no. 3 has been undertaken in order to determine the stellar space distribution of dB and gK stars. A concentration of dB stars has been found at the distances between 150 to 250 pcs. The color excess in this direction is found to remain very low. It only reaches 0m12 at r = 0.5 kpc and remains constant thereafter.  Ringkasan. Suatu survey dengan prisma obyektip pada arah Palomar-Groningen Variable-Stars Field no. 3 telah diadakan guna menentukan distribusi ruang bintang-bintang dB dan gK. Sebuah konsentrasi bintang-bintang dB ditemukan pada jarak antara 150 sampai 250 pc. Harga Ekses Warna pada arah ini didapati cukup rendah. Ekses tersebut besarnya hanya mencapai Om12 pada r = 0.5 kpc dan tidak banyak berubah pada jarak-jarak yang lebih besar.
Simple Method to Calculate the Oscillating Lift on a Circular Cylinder in Potential Flow Harijono Djojodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 2 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. A simple potential flow model is presented to calculate the oscillating lift on a circular cylinder. In essence, the time dependent lift acting on a cylinder is due to the presence of a vortex shed off the separation point on the cylinder. The vortex strength and its trajectory is predicted employing the condition of zero force on the vortex and its feeding vortex sheet. The vortex breaks away from the cylinder and is convected by the fluid after the vortex strength reaches a maximum value, and another vortex is shed at the other side of the cylinder. Oscillating lift with the right order of magnitude of available experimental results was predicted. For subcritical flow, good agreement is obtained between the predicted Strouhal number and that found experimentally.  Ringkasan. Suatu model aliran potensial sederhana diuraikan untuk menghitung gaya angkat yang berosilasi pada silinder lingkaran. Pada dasarnya, gaya angkat yang berosilasi ini disebabkan karena adanya vortex yang dilepaskan oleh silinder dari titik pemisahan. Kekuatan vortex dan lintasannya dihitung dengan menggunakan syarat bahwa gaya pada vortex dan bidang vortex yang menumbuhkannya harus sama dengan nol. Vortex ini terputus dari silinder pada waktu kekuatannya mencapai maksimum, dan vortex yang lain mulai dilepaskan pada sisi silinder yang lain. Hasil perhitungan menunjukkan harga gaya angkat maksimum yang mendekati harga yang diperoleh secara eksperimentil. Demikian pula, untuk aliran subkritis, diperoleh hasil perhitungan bilangan Strouhal yang mendekati harga yang diperoleh secara eksperimen.
Tinjauan Ulang Mengenai Biokimia DNA dan RNA serta Biosintesa Protein P. Soedigdo
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 2 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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No Abstract. 
Geothermy and its Future in Indonesia M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The basic concept of a commercial steamfield is discussed and defined in this paper. Based on this discussion potential areas are indicated in a map. It is found that not less 24 geotherrnal areas are prospectable. However, it is found that very little is known about the exact potential of Indonesia in the field of geothermy. Anticipating the rising demand in electricity within the context of the broader industrialisation program of Indonesia and the limitation of its fossil fuel reserve, it is suggested that all possibilities for utilising different kinds of energy, including geothermy should be explored as far as possible. Ringkasan. Konsep dasar dari suatu medan uap alam komersil diperbincangkan dan didefinisikan. Berdasarkan pada diskusi tersebut daerah-derah dengan potensi geothermy dicantumkan ke dalam peta. Ternyata bahwa tak kurang dari 24 medan hyperthermal tersebar di seluruh wilayah Indonesia yang berkemungkinan untuk dapat dieksplorasikan lebih lanjut. Saying sekali bahwa sangat sedikit yang diketahui mengenai potensi Indonesia sesuangguhnya dalam bidang ini. Menghadapi permintaan tenaga listrik yang semakin menanjak dalam rangka pengembangan program industrialisasi Indonesia, dan terbatasnya persediaan bahan bakar fossil, pengarang menganjurkan agar semua segi dan kemungkinan pemanfaatan segala macam sumber energi , termasuk geothermy, dijajaki sejauh mungkin.
Mesodermal Competence of the Presumptive Ecto-Neuroderm at Various Developmental Stages, in Xenopus laevis (Daudin) Sri Sudarwati
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. A comparative study on the reactive capacity of the presumptive ecto-neuroderm on mesoderm formation with increase of age has been done in Xenopus Laevis. It was proved that before gastrulation, mesoderm induction mainly produces dorsal mesodermal structures. During the gastrulation process the product of differentiation tends to shift from dorsaL to ventral mesodermal structures. The presumptive ecto-neuroderm has has already a competence for mesoderm formation at the early blastula stage and this competence starts to fade out at the horse-shoe-shaped blastopore stage.  Ringkasan. Suatu studi perbandingan mengenai kapasitas berreaksi dalam membentuk mesoderm dari presumptive ekto-neuroderm dengan bertambahnya umur, telah dilakukan pada Xenopus laevis. Telah dibuktikan, bahwa sebelum gastrulasi induksi mesoderm terutama menghasilkan struktur-struktur mesoderm dorsal. Selama proses gastrulasi berlangsung, hasil differensiasi cenderung untuk menggeser dari struktur-struktur mesoderm dorsal ke struktur-struktur mesoderm ventral. Presumptif ekto-neuroderm telah mempunyai kompetensi untuk membentuk mesoderm pada stadium blastula muda dan kompetensi tersebut mulai menghilang pada stadium blastoporus berbentuk sepatu kuda. 
Efek Stimulatif dari Bacteria terhadap Pembentukan Tubuh-Buah Djamur Padi (Volvariella volvacea (Fr.) Sing.) U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Ringkasan. Penelitian terhadap ada tidaknya efek stimulatif dari bakteria tertentu terhadap pembentukan tubuh-buah djamur padi (Volvariella volvacea (Fr.) Sing.) telah dilakukan dalam kondisi semi steril. Ternjata bahwa adanja bakteria tertentu merangsang pembentukan tubuh-buah djamur padi. Abstract. A study has been made on the stimulative effect of certain specific bacteria upon fruit body formation of rice straw mushroom (Volvariella volvacea (Fr.) Sing.) under semi-sterile condition. It was shown that the presence of specific bacteria stimulated fruit body formation of rice straw mushroom. 
Penentuan Deradjat pada Pembusukan pada Udang P. Soedigdo; Rochestri Ijad; Tan Hwie Liep
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Ringkasan. Pembusukan pada udang adalah suatu akibat kerdja enzima2 hidrolitik berasal dari udang sendiri dan djuga dari bakter2 jang ada pada udang. Hasil penelitian menjatakan bahwa aktivitas spesifik SH-protease udang ber-angsur2 menurun selama proses pembusukan, sehingga sifat ini baik untuk dipakai sebagai kriteria pembusukan udang. Aktivitas enzima ditentukan pada 37oC selama 20 menit dengan 1% kasein dalam 0,1 M buffer fostat pH 8 sebagai substrat dan siteina (0,02 M) sebagai activator. Sebagai larutan enzima dipakai homogenat udang dalam 0,1 M buffer fosfat pH 8. Berdasarkan atas sifat penurunan aktivitas spesifik SH-protase dan kenaikan pH dan kadar trimetilamina udang pada proses pembusukan, maka dapatlah disusun suatu penggolongan deradjat kesegaran udang. Hal ini dapat penting untuk keperluan2 dalam praktek.Abstract. Spoilage of shrimps is largely caused by enzyme action especially by shrimp proteases in addition to microbial action which is also enzymatic in nature. It was found that when spoilage is in progress the specific activity of the shrimp SH-proteases is remarkably decreased. It appeared that this is a suitable criterion for the determination of the degree of spoilage. Enzyme activity determinations were carried out at 37°C with 1% of casein in 0.1 M phosphate buffer of pH S as the substrate and cysteine (0.02 W as the activator). Shrimp homogenate was used as the enzyme solution which was prepared in 0.1 M phosphate buffer of pH 8 at 0-4°C. Based on the decrease of SH-protease activity and on the increase of pH and volatile base (trimethylamine etc.) content a classification of the freshness of shrimps can be made, which might be useful for practical purposes.
Pengamatan Okultasi Beta Scorpio oleh Planit Jupiter B. Hidajat
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 4 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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The occultation of the multiple star Beta Scorpio by Jupiter was observed visually and photographically with the 24"-twin telescope of the Bosscha Observatory. The photographic records obtained by S.M. Larson, using the instrument of the Bosscha Observatory, provided support to a scale height greater than 8 km. The Lembang visual measurement is shown to be consistent with other observations, taken from other observatories. 
Penghambatan Respirasi Djaringan oleh Ekstrak Daun Sambiloto, Andrographis paniculata Nees P. Soedigdo; An An Kurniasari; Thung Loan Kiao; Soekeni Soedigdo
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 4 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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It was shown recently that crude extracts prepared from the leaves of Andrographis paniculata Nees have a significant hypoglycaemic effect when given orally to rabbits as well as to normal and diabetic persons (2). In the course of further investigations, the effect of the extract on cell respiration was studied. Bovine heart muscle homogenates were used for the experiments. Oxygen uptake was followed in a Warburg apparatus at 30°C with air as the gas phase. In the absence of added substrate the homogenate showed a considerable oxygen uptake, most probably due to the oxidation of endogenous substrates. It appeared that this oxygen consumption was inhibited by the crude extract added at various concentrations. Whether this effect was caused by the hypoglycaemic substance is still unanswered. Work is in progress to isolate the physiologically active compounds. 
Some Notes on the Energy Metabolism of Gadus callarias and Gadus virens in Relation to Body Size Mahhargo Suprapto
Journal of Mathematical and Fundamental Sciences Vol. 6 No. 4 (1972)
Publisher : Institute for Research and Community Services (LPPM) ITB

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The present work of oxygen consumption in Gadus callarias and Gadus virens shows that there is a connection between the body size and the acclimation time required for reaching a "normal" level of metabolism after being transferred to another aquarium (fig. : 1, 2, 3 & 4). The oxygen consumption under standard condition shows that there is a clear linear regression between the two variable used. However, the significant coefficient does not exclude the possibility of a difference in oxygen consumption in relation to the weight between small fish and bigger ones. 

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