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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. 9 No. 1 (1974)" : 3 Documents clear
Pemakaian Resistor Karbon dan Dioda Sambungan P-N dalam Thermometry Suhu Rendah Marsongkohadi Marsongkohadi; A. Kreshna; Ngurah Made Agung
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Karakteristik dari resistor karbon dan diode sambungan p-n yang terdapat di pasaran, telah diteliti pada suhu antara 80°K dan 220°K. Data-data dari resistor karbon, sesuai dengan persamaan tiga-parameter dari Clement-Quinnell. Suhu yang dihitung dari persamaan ini, berbeda +- 0,5 persen dengan suhu yang diukur. Kepekaan thermometriknya adalah sedemikian rupa, sehingga jika ketelitian pengukuran tahanan 0,1 persen, maka perbedaan suhu sebesar 0,4°K pada 93°K dapat dideteksi. Reprodusibilitas dari pengukuran suhu ini lebih kurang 4 persen. Pada beberapa diola sambungan p-n yang diselidiki, karakteristik T-V pada suhu kamar sampai suhu nitrogen cair, hampir linear. Selain dari itu, diode ini menunjukkan reprodusibilitas yang baik setelah mengalami goncangan thermis. Kecuraman dari karakteristik T-V dengan arus sebagai parameter dapat diterangkan dengan menganggap bahwa sambungan p-n tersebut mengalirkan arus rekombinasi-generasi, sesuai dengan teori Sah, Noyce dan Shockley. Abstract. The characteristic of some commercially manufactured carbon resistors and p-n junction diodes are measured from 80°K to 220°K. Datas of the resistors fit the three-parameter equation of Clement-Quinnell. Temperatures calculated by this equation are within 0.5 percent, of the measured temperatures. Thermometric sensitivity is such that by measuring resistance to one part in 1000, it is possible to detect temperature changes of 0.4°K at 93°K. Temperatures are reproducible within about 4 percent, from run to run. In some p-n junction diodes, we have observed nearly linear T-V characteristic from room temperature to liquid nitrogen temperature. In addition these diodes exhibit good repeatability on temperature cycling. The slope of the T-V characteristic with current as a parameter, is explained by assuming that the device conducts primarily recombination-generation current according the theory of Sah, Noyce and Shockley. 
The Growth and Orientation of Platelet Ag3Sn Single Crystals Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Kristal-kristal tunggal Ag3Sn pipih dengan tebal 200 μm dan 5 mm pada dimensi yang lain, dapat dihasilkan dengan cara "temperature gradient" dari suatu ingot Ag-Sn dengan komposisi 40% berat Ag dan 60% berat Sn. Permukaan bidang pipih dari Kristal-kristal tunggal yang didapat mempunyai bidang kristalografi yang sama. Dengan cara difraksi sinar X, dapat ditunjukkan bahwa bidang tersebut adalah bidang (020).Platelet single crystals of Ag3Sn of 200 μm thickness and 5 mm in the other dimensions can be produced by temperature gradient method from an ingot of Ag-Sn alloy with a composition of 40 wt % Ag and 60 wt % Sn. It was found that the platelet surfaces have the some crystallographic plane. X-ray diffraction study showed that the plane is (020) plane.
Survey on Important Pests of Rice and Vegetables with Emphasis on Population Trend and its Damage Soelaksono Sastrodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Telah dilakukan pengamatan tentang komponen serangga dan arthopoda lain pada asosiasi padi dan sayuran. Didapatkan bahwa komponen tersebut masih cukup berarti dari segi rantai interaksi ekologis. Dilakukan penafsiran terhadap pola populasi penggerek batang padi serta serangga hama sayuran dengan cara sampling stadia muda dan dewasa. Diketemukan pola populasi yang tidak begitu bervariasi untuk suatu daerah yang luas di Jawa Barat. Abstract. The insects and other arthropode components of rice and vegetables association were investigated. It was found that these components were still meaningful from the aspect of ecological interaction. Estimate of rice-borers population trend and also of the vegetables pests were carried out by means of immatures and matures sampling. Apparently the variation of the population trend of rice as well as vegetable pests was small within a relatively large area in West Java. 

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