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K. Purbosiswojo
Bosscha Observatory, Lembang (Java)
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics

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Beberapa Tjatatan Mengenai Roket K. Purbosiswojo
Journal of Mathematical and Fundamental Sciences Vol. 3 No. 1 (1964)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ichtisar. Dalam karangan ini didjelaskan beberapa persamaan untuk roket ideal. Dalam roket ideal ini termasuk roket jang pengurangan bahan bakarnja tiap waktu adalah konstan dan roket jang gaja dorongnja konstan dalam segala keadaan tekanan udarannja statis dan ketinggian roket dari permukaan air laut. Abstract. In this paper some equations for idealized rockets are discussed. This type of rockets include those which rate of mass-change is constant and those which thrust is constant in any kind of condition of static pressure and altitude.
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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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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