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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 4 Documents
 1 
Search results for , issue "Vol. 3 No. 4 (1965)" : 4 Documents clear
A Photometric Study of the Galactic Cluster NGC 6124 Pik Sin The
Journal of Mathematical and Fundamental Sciences Vol. 3 No. 4 (1965)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Magnitudes and colours on the B, V system are determined for stars in the galactic cluster NGC 6124, based on a photoelectric sequence measured by Koelbloed and an extension of this toward faint stars. The distance of the cluster is about 580 pcs. and the age somewhat more than 108 years. Ichtisar. Magnitudo dan warna dalam sistim B. V daripada bintang2 dalam gugus galaktik NGC 6124 telah ditentukan berdasarkan suatu deret photoelektrik jang diukur oleh Koelbloed dan perluasannja kepada bintang-bintang jang lemah tjahanja. Djarak daripada gugus itu telah ditentukan kira2 580 pc. dan usianja kira2 108 tahun lebih sedikit.
To Grow Single Crystals of 6061 Alumunium Alloy Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 3 No. 4 (1965)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Single crystals of 6061 alumunium alloy can be produced by "strain anneal" method from wire  of 2mm diameter. With this method 70% of the test specimens grown into single crystals of length of 2.5 cm. Ichtisar. Kristal tunggal dari paduan aluminium 6061 dapat dihasilkan dengan tjara "strain anneal" dari kawat jang berdiameter 2 mm. Dengan tjara ini 70% dari kawat-kawat tersebut tumbuh mendjadi kristal tunggal jang pandjangnja 2,5 cm.
Evaluation of the Spectrophotometric Determination of Zinc with Methylene Blue and Thiocyanate Isjrin Noerdin
Journal of Mathematical and Fundamental Sciences Vol. 3 No. 4 (1965)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The reaction of zinc with methylene blue and thiocyanate is developed to a highly sensitive spectrophotometric  determination of zinc in which the unknown zinc is reacted with methylene blue and thicyanate, giving insoluble complex. This is filtered off and the decrease in the amount of zinc present, is measured. Suitable masking agents prevent interference of most common ions, even when present in large amounts, except with cobalt, copper, cadmium and mercury which do not interfere if present in small amounts only. In simplicity, sensitivity and freedom from interference this method compares favorably with dithizone and zincon methods.Ichtisar. Reaksi seng dengan biru metilena dan tiosianat diperkembangkan mendjadi suatu penentuan spektrofotometris jang sangat pekak untuk seng dalam mana seng itu direaksikan dengan biru metilena dan tiosianat dengan menghasilkan suatu kompleks jang tak larut. Kompleks ini disaring dan berkurangnja djumlah seng diukur.  Dengan zat penkompleks jang sesuai dapat dihilangkan gangguan dari kebanjakan ion jang umum terdapat walaupun djumlahnja besar, ketjuali untuk Cobalt, tembaga dan raksa, ion2 mana hanja tidak akan mengganggu kalau djumlahnja ketjil. Ditilik dari segi kesederhanaan, kepekaan dan kebebasan dari gangguan tjara ini menguntungkan djika dibandingkan dengan tjara2 detbezon dan zincon.
Generator Pulsa Arus Mak Sioe Tho
Journal of Mathematical and Fundamental Sciences Vol. 3 No. 4 (1965)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Dalam penjelidikan mengenai karakteristik suatu arrester, selain mengetahui karakteristik tembus terhadap tegangan pulsa djuga perlu diselidiki sifat2 tahanan non linearnja (lazim dipergunakan Si C) terhadap pulsa arus menentukan tegangan tinggalnja (Rest spanning). Untuk kepentingan ini dipergunakan pulsa arus 5 x 10 μ sec ataupun 10 x 20 μ sec. Disini akan dibahas mengenai parameter2 rangkaian dan faktor2 jang penting diperhatikan dalam perentjanaan suatu generator pulsa arus. Abstract. In order to obtain the performance characteristic of an arrester, besides knowing the breakdown voltage of its gaps it is also necessary to know the behaviour of the non linear value element (usually Si C) with respect to current surges to get a picture of its rest voltage. For this purpose  5 x 10 μ sec or 10 x 20 μ sec current surges are used. The circuit parameters, and some important factors concerning the design of a current surges generator are discussed here.

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