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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
 1 
Search results for , issue "Vol. 11 No. 3 (1978)" : 3 Documents clear
Ontogeny of Apothecia of Sclerotinia Sclerotiorum (Lib.) De Bary Buddy Dani Kosasih
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 3 (1978)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Pertumbuhan morfologi dan struktur dari pada "apothecia" Sclerotinia sclerotiorum (Lib.) de Bary telah dipelajari dengan berbagai cara. Apothecia dibentuk dari sel-sel bakal yang letaknya di dalam sclerotium, terdiri dari sel-sel kecil (kira-kira bergaris tengah 0,5-2,5μm), berdinding tipis, dan berkaitan satu dengan yang lainnya  sehingga membentuk parenkima semu. Setelah kira-kira  20 hari, maka sel-sel bakal tersebut akan muncul ke permukaan sclerotium. Mula-mula sekali merupakan penonjolan, berwarna kuning kecoklat-coklatan, kemudian berubah menjadi bentuk batang dengan ujung yang sedikit meruncing dan pertumbuhannya biasanya mengarah ke sumber cahaya. Selanjutnya bagian ujungnya berubah menjadi bentuk cawan yang melebar (apothecia).
Pengaruh Endoxan-Asta terhadap Pertumbuhan Embrio Ayam yang Disuntikkan pada Macam-macam Umur Pengeraman Sri Sudarwati; Tien Wiati Suryono
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 3 (1978)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. The influence of Endoxan-Asta (cyclophosphamide) on the development of chicken embryos has been investigated by injecting the substance into the yolk sac of 2-,3-, 4-, 5-,6-, and 7-day old embryos. The 4- and 5-day old embryos were found to be the most affected by injecting 0,04 mg Endoxan per egg. The younger the embryo when Endoxan is administered, its influence of the development of long bones of the leg is shifted for the tarso-metatarsus to the tibio-tarsus (towards the bones which are situated more proximally). In all experiments done, ectopia viscerum is the most obvious malformation. It has been proven clearly, that Endoxan caused stunted growth.
Penutupan dengan Asbes Dapat Memperbaiki Sifat Mekanik dari Sambungan Baja dengan Las Busur Listrik Trisno Trisno; A. Sulaiman; H. Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 3 (1978)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Sifat-sifat mekanik yang penting dari sambungan las adalah kekuatan dan keuletan. Kedua sifat ini dapat diuji dengan pengujian tarik, pengujian takik dan pengujian kekerasan. Kedua sifat utama tersebut sangat tergantung dari perlakuan lanjut yang dikenakan pada sambungan yang dimaksud. Di dalam penelitian ini dibandingkan pengaruh dari tiga perlakuan lanjut terhadap kedua sifat mekanik tersebut di atas pada sambungan las baja dengan busur listrik. Ketiga perlakuan lanjut yang dimaksud adalah: (a) tanpa perlakuan apa-apa, (b) dipanaskan dalam tungku pada temperature 650'C selama setengah jam dan diikuti dengan pendinginan di dalam tungu dan (c) ditutup dengan asbes segera setelah selesai pengelasan lapisan las yang terakhir. Hasil penelitian menunjukkan bahwa penutupan dengan asbes menghasilkan sifat-sifat mekanik yang lebih baik dari pada pengelasan yang tidak diikuti dengan perlakuan apa-apa, walaupun belum menyamai hasil dari pengelasan yang mendapat perlakuan lanjut dengan pemanasan di dalam tungku. Abstract. The important mechanical properties in welding technology are strength and ductility of the welded joint. These two properties can be examined through tensile testing, impact testing and hardness testing. It has been known that those two properties are influenced by the post treatment imposed to the welded joint. In this work, those properties were studied on electric arc welded joints of steel plates which have undergone three different post treatments. The three treatments are: (a) without post treatment,  (b) heated in the furnace at 650° C for half an hour followed by furnace cooling and (c) covering the weld with asbest immediately after the last pass of welding process. Results of the study shows that covering the weld with asbests produces better mechanical properties than that without treatment, eventhough  it is still inferior compared to the one which has been heated in the furnace. Due to the incomplexity and uncostly of the asbest-covered post treatment, it is necessary to study further the development of this treatment process for practical use.

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