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Harijono Djojodihardjo
Mechanical Engineering Department, Bandung Institute of Technology
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics

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Vinti's Surface Density as a Means of Representing the Earth's Disturbance Potential Harijono Djojodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 4 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Vinti's method of representing the potential of the earth in two parts, with the first part represented by spheroidal potential and the second part being the earth disturbance potential, is outlined. The earth's disturbance potential is then represented as a surface distribution σ of mass density of variable sign over a sphere S just clearing the earth. The feasibility of the method is evaluated by calculating the distribution of o from satellite determination of the harmonic coefficients. Ringkasan. Suatu metoda untuk menyatakan potensial bumi berdasarkan teori Vinti diuraikan. Menurut metoda ini, potensial bumi dinyatakan sebagai jumlah potensial utama, yang diperoleh sebagai potensial spheroid, dan potensial gangguan, yang dinyatakan sebagai distribusi kerapatan masa permukaan pada suatu bola yang tepat menyelubungi bumi. Kegunaan metoda ini diuji dengan menghitung distribusi σ dengan menggunakan koefisien-koefisien harmonik yang ditentukan dari analisa data satelit.
Some Notes on the Design, Construction and Performance of the Low-Speed Wind-Tunnel at ITB Harijono Djojodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 3 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. A concise description of the design and construction of the low speed wind-tunnel at Institut Teknologi Bandung and the calculation of its energy losses are presented. Some tests have been undertaken to evaluate its performance, in particular to evaluate the flow pattern at the test-section and the power input for a specific range of wind velocity at the test-section. The maximum velocity achieved at the test-section was 30 m/sec with corresponding Reynolds number of 2 x 104 per cm.  Ringkasan. Konstruksi dan perhitungan kerugian energi  pada terowongan angin kecepatan rendah di ITB diuraikan secara garis besar. Selanjutnya dipaparkan hasil-hasil penilaian performance dari terowongan angin ini, terutama mengenai keadaan aliran pada testsectiondan hubungan antara daya input pada motor dengan kecepatan aliran pada test-section. Kecepatan angin sebesar 30 m/det dapat diperoleh pada test-section, dengan bilangan Reynolds sebesar 2 x 104 per cm model.
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