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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 2 Documents
 1 
Search results for , issue "Vol. 19 No. 2/3 (1986)" : 2 Documents clear
Pembuatan dan Karakterisasi Ferit Heksagonal BaFe12O19 Marsongkohadi Marsongkohadi; M. Daveny Soufian; Sri Kusmanto; Kumiadi Sumaamidjaya; Achmad Arslan
Journal of Mathematical and Fundamental Sciences Vol. 19 No. 2/3 (1986)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Polikristal ferit heksagonal BaFe12O19 telah dibuat dengan cara standar pembuatan keramik. Serbuk murni BaCO3 dan Fe2O3 dengan komposisi non-stoikhiometrik BaO. n Fe2 O3 (n = 5,5, 5,7, dan 5,9) digiling dengan bola-bola baja dan dipanaskan pada suhu kalsinasi selama beberapa jam. Penambahan fluks 0,5% NaF pada campuran tersebut mengakibatkan penurunan suhu kalsinasi dengan 150'C-200'C sehingga pembentukan ferit heksagonal dapat terjadi pada suhu 900'C, bukan pada 1100'C-1200'C seperti halnya tanpa fluks. Cuplikan yang diarahkan oleh medan magnet telah dikarakterisasi dengan difraksi sinar-X, menggunakan radiasi MoKa. Cuplikan-cuplikan tersebut juga diteliti dengan difraksi neutron dengan panjang gelombang phi = 1,071 A dan dilakukan pengukuran magnetik konvensional. Semua hasilnya dibandingkan terhadap hasil pengukuran pada cuplikan BaFe12O19 buatan pabrik Sumitomo, Jepang. Hasilnya jelas menunjukkan bahwa struktur kistal dan sifat-sifat magnetik ferit yang dibuat dalam percobaan ini mendekati cuplikan Sumitomo, sehingga cuplikan tersebut berguna sebagai bahan magnet permanen. Abstract. Polycrystalline hexagonal ferrites BaFe12O19 have been prepared by standard processes of ceramics. Pure BaC03 and Fe2O3 powders of non-stoichiometric compositions Ba . n Fe203 (n = 5.5, 5.7.and 5.9) were ball-milled and calcined for several hours. Addition of 0.5% NaF flux reduced the calcining temperature by 1500C-2000C thus enabling the formation of hexagonal ferrite at 9000C instead of 1100­C - 12000C. Magnetically aligned specimens were characterized by X-ray diffraction using MoKα radiation. These specimens were also examined by neutron diffraction with λ = 1.071 A and standard magnetic measurements. All the present results were compared with those obtained from the BaFe12O19 specimens manufactured by Sumitomo, Co, Japan. The results clearly showed that the present made ferrites had crystal structures and magnetic properties fairly similar to those specimens manufactured by Sumitomo, Co and thus enabling them to be used as permanent magnet material. 
Seasonal Activity of The Cambium in the Young Branch of Swietenia Macrophylla King E.B. Hidajat; T.S. Suradinata; B.I. Utomo
Journal of Mathematical and Fundamental Sciences Vol. 19 No. 2/3 (1986)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Keragaman musim dalam aktivitas kambium pembuluh pada Swietenia macrophylla King telah diteliti mulai bulan Agustus 1983 sampai dengan Juli 1984. Di bulan Agustus aktivitas tersebut lambat dan di bulan September tampak sifat-sifat dorman. Setelah bulan-bulan kering itu aktivitas kambium kembali tampak di bulan Oktober saat curah hujan tinggi. Aktivitas terus berlangsung di bulan-bulan berikutnya dan mereda di bulan Maret. Aktivitas kambium paling tinggi berlangsung di bulan April sewaktu terjadi puncak kedua dalam curah hujan di musim hujan. Aktivitas yang tinggi ilu terjadi bersamaan dengan munculnya daun baru yang didahului oleh suatu periode gugur daun yang singkat. Aktivitas kambium mereda di bulan-bulan berikutnya. Abstract. Seasonal variation in the activity of the vascular cambium of Swietenian macrophylla King has been investigated from August 1983 to July 1984. Cambial activity is slow in August, and in September dormant features are seen. After the preceding dry months the cambium shows activity again in October when heavy rainfall occurs. The activity continues during the following months and slows down in March. The cambium is most active in April when a second peak of rainfall occurs in the rainy season. This grand activity of the cambium coincides with the emergence of a new crop of leaves which is preceded by a brief period of defoliation. Cambial activity slows down again in the following months.

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