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INDONESIA
Indonesian Journal of Physics (IJP)
Published by Institut Teknologi Bandung
ISSN : 23018151     EISSN : 29870828     DOI : https://doi.org/10.5614/itb.ijp
Core Subject : Science, Engineering,
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
Indonesian Journal of Physics welcomes full research articles in the area of Sciences and Engineering from the following subject areas: Physics, Mathematics, Astronomy, Mechanical Engineering, Civil and Structural Engineering, Chemical Engineering, Electrical Engineering, Geotechnical Engineering, Engineering Science, Environmental Science, Materials Science, and Earth-Surface Processes. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 5 Documents
 1 
Search results for , issue "Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001" : 5 Documents clear
Progress Report On Supersymmetric Particle Searches With the D-Zero Detector AuthorJohannes V. Djoko Wirjawan
Indonesian Journal of Physics Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001
Publisher : Institut Teknologi Bandung

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Abstract

Supersymmetry which relates bosons and fermions is a new symmetry theory. Searches for supersymmetric particles at the large colliders around the world that just started in the last two decades show slow progress. Based on accumulated data of about 100 pb−1 collected with the D-Zero detector at Fermilab, no evidence of supersymmetric particles was found. Lower mass limits based on the production cross-section and the exclusion of some parameter space for squark-gluino and chargino-neutralino searches will be discussed.
Struktur Double Barrier Untuk Aplikasi Pada Divais Silikon Amorf Ida Hamidah; Wilson W. Wenas
Indonesian Journal of Physics Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001
Publisher : Institut Teknologi Bandung

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Abstract

Dalam studi ini dikaji sifat-sifat struktur double barrier pada divais silikon amorf (a-Si). Struktur double barrier dibangun dengan mengkombinasikan material a-Si:H dengan material a-SiC:H yang memiliki celah energi optik yang berbeda. Material a-Si:H berfungsi sebagai sumur kuantum di antara material a-SiC:H yang berfungsi sebagai barrier. Probabilitas tunneling yang menjadi pokok utama sifat-sifat struktur double barrier dihitung berdasarkan persamaan Schroedinger, pendekatan WKB, dan pendekatan Lorentzian. Probabilitas tunneling mencapai harga 0,12 untuk tegangan luar 10 V, tebal barrier 10 Å dan lebar sumur potensial 10 Å. Selanjutnya, hasil perhitungan probabilitas tunneling diaplikasikan pada salah satu divais a-Si yaitu Thin Film Light Emitting Diode (TFLED), untuk menghitung rapat arus tunneling dan brightness. Didapatkan bahwa semakin tinggi probabilitas tunneling, rapat arus tunneling semakin meningkat dan pada akhirnya dapat meningkatkan harga brightness dari TFLED.
Pengaruh Tekanan Dan Komposisi Massa Pereaksi II-VI Terhadap Penumbuhan Lapisan Tipis ZnO Dengan Metode MOCVD M. Thamrin; Wilson W. Wenas
Indonesian Journal of Physics Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001
Publisher : Institut Teknologi Bandung

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Abstract

Dalam penelitian ini telah berhasil dikaji dalam bentuk pemodelan dan eksperimen pengaruh tekanan dan komposisi massa pereaksi II-VI terhadap penumbuhan lapisan tipis ZnO dengan metode Metalorganic chemical vapor deposition (MOCVD) menggunakan untuk pertama kalinya gas sistem pereaksi DMZn/H2O. Hasil dari pemodelan dan eksperimen menunjukkan kesesuaian yang baik. Dari analisa laju penumbuhan lapisan tipis ZnO terhadap tekanan deposisi didapatkan bahwa laju penumbuhan meningkat secara eksponensial, sedangkan terhadap komposisi massa pereaksi II-VI, laju penumbuhan cenderung menjadi saturasi di atas nilai stoichiometri.
Identification and Enrichment of Indonesian Zeolite using Cation Flotation Method Muhammad Hikam; Endang Asijati
Indonesian Journal of Physics Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001
Publisher : Institut Teknologi Bandung

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Abstract

The cation flotation method was employed to enrich the A-modernite fraction by observing the change of the mixture density, pH, type and concentration of collector and concentration of HF as a function of the floated quantity of this A-morderite. X-ray diffraction analysis using Shimadzu XD-D1 was conducted to examine the specimens for several variations and settings. The d-spacing identifications were done by comparing the experimental data with the ICDD database and then quantitative analyses were performed. Before the treatment, the existence of A-mordenite in this natural product was confirmed, it has space group Fd3m with lattice parameters a = (24.46 ± 0.96) Å. The average weight concentration before the treatment was 41,02%. The remaining mineral was identified as epistilbite Ca3Si9Al3O24.8H2O, clinoptilolite [KNa2K2] Al2Si10O247H2O and B-mordernite [CaNa2K2]Al2Si10O24.7H2O. After the treatment, higher concentration of A-mordenite was obtained by setting a higher collector concentration, lower HF activator, and pH value to the value 5.0. The highest concentration of A-mordenite was achieved when the setting was 66.45%. The crystallographic structure remained the same since there were neither violent chemical reactions nor heating in all the processes.
The Evaluation of Crack Propagation in the Reinforced Concrete by Acoustic Emission Titin Kathrina
Indonesian Journal of Physics Vol 12 No 1 (2001): Vol. 12 No. 1, Januari 2001
Publisher : Institut Teknologi Bandung

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Abstract

Acoustic emission (AE) a non-destructive testing technique that is specially used to detect active cracks. This technique was employed to evaluate crack propagation in the reinforced concrete specimens during static loading in the four-point bend test. Cracks were detected by an array of AE sensors which were fixed on the surface of a specimen. AE signals from crack activities were then recorded and analysed by the AE computerised system. The AE results from crack activities during static loading were classified into three stages of crack mechanisms. In the first stage, the AE sources were expected to appear from micro and macro cracks in the presence of pores, voids, mortar, sand, etc. in the concrete part. In the second stage the steel bars were deformed elastically. Here AE sources were attributed to continuously macro cracking in the concrete part and slip between steel reinforcing bar and concrete. In the third stage, when the steel bars were deformed plastically, AE sources were generated by large crack in both longitudinal and shear cracks due to high level of applied loading. This experimental work showed a very sensitive AE technique to detect crack growing in the reinforced concrete structure.

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