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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
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Search results for , issue "Vol. 2 No. 3 (1963)" : 3 Documents clear
Photometry of the Galactic Cluster NGC 6649 Pik Sin The; Curt Roslund
Journal of Mathematical and Fundamental Sciences Vol. 2 No. 3 (1963)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Dengan mengggunakan teknik fotoelektrik dan fotografik diberikanlah magnitudo dan warna daripada 80 bintang dalam gugus galaktik NGC 6649, dalam UBV Johnson. Dengan menggunakan reflektor 60 intji di Observatorium Boyden telah didapatkan observasi fotoelektrik dalam 3 warna. Untuk fotometri forografik telah diambil katja2 potret dalam 2 warna dengan menggunakan teleskop Schmidt 20-28 intji di Lembang. Modulus djarak visuil semu daripada NGC 6649 adalah 14,2 mag, ekses warnanja ialah 1,2 mag, dan modulus sesungguhnja ialah 10,6 mag., sesuai dengan djarak 1300 parsek. Observasi fotoelektrik membuktikan bahwa salah sebuah bintang dalam NGC 6649 mungkin adalah sebuah bintang berubah Cepheid Abstract. By using photoelectric and photographic techniques magnitudes and colours in the Jhonson UBC system are given for eighty stars in the galactic cluster NGC 6649. Photoelectric three-colour observations were made with the 60 inch reflector at the Boyden Observatory. Photographic plates taken in two colours with the 20-28 inch Scmidht type telescope at Lembang were used for photographic photometry. The apparent visual distance modulus of NGC 6649 is 14.2 mag., the colour excess is1.2 mag. and the true modulus, corresponding to a distance of 1300 parsecs. The photoelectric observation show that one of the stars in the cluster of NGC 6649 is a possible Cepheid variable. 
On the Nearest Real Singularities of a Single Loop Feynman Diagram M. Barmawi
Journal of Mathematical and Fundamental Sciences Vol. 2 No. 3 (1963)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Disini dibahas sarat-sarat untuk singularitas riel terdekat dari amplitude proses2 jang ditundjukkan oleh suatu diagram Feynman dengan satu lingkaran tertutup jang umumnja menjatakan produksi dari partikel2. Telah ditundjukkan bahwa sarat Landau dan positipnja parameter Feynman jang bersangkutan tidak tjukup. Sarat selandjutnja jang masih harus dipenuhi ternjata merupakan perluasan dari sarat Karplus, Sommerfield dan Wichmann jang diketemukan untuk "fungsi tiga titik". Selandjutnya akibat sarat tambahan ini dibahas, dimana ditundjukkan pula hubungannja dengan "dugaan" (conjecture) dari Nambu dan Blankenbeckler jang ternjata umumnja tak benar. Pembahasan ini djuga dapat dipergunakan pada diagram Feynman jang sembarang. Abstract. The nearest singularities of production amplitude corresponding to a single loop Feynman diagram is discussed. It is shown that Landau condition and the positiveness of the Feynman parameter is not sufficient for the part of Landau curve to be the nearest real singularity. The additional condition is the generalized Karplus, Sommerfield and Wichmann condition, originally found in the 3-point function. The consequences of this additional condition is discussed and related to Blanken-beckler-Nambu conjecture. The discussion is also applicable to an arbitrary Feynman diagram.
Correction of Background Effect in Photographic Photometry K. Purbosiswojo
Journal of Mathematical and Fundamental Sciences Vol. 2 No. 3 (1963)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Suatu metoda untuk memperbaiki hasil2 fotometri jang diperoleh dengan mempergunakan photometer Eichner telah disadjikan dibawah ini. Penggunaan metoda tsb. telah ditjobakan pada gugus bintang NGC 6530 untuk fotometer di Observatorium Warner and Swasey. Metoda ini djuga dapat digunakan pada bagian2 dari katja potret jang kepekatan emulsi daripada latar belakangnja ber-beda2.Abstract. A method to correct photographic magnitudes of stars embedded in nebulosities measured by making use of Eichner-photometers is presented. An application of the method was carried out on the Galactic Cluster NGC 6530 for the photometer of Warner and Swasey Observatory. The method is also applicable on parts of photographic plates which background-emulsion densities differ from that of the region of the standard sequence 

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