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Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA
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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 313 Documents
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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.
Fabrication of High Quality Thin Film of PPV Derivative Polymers Using a Spincoating Method F. Fitrilawati; M.O. M.O. Tjia; J. Ziegler; C. Bubeck
Indonesian Journal of Physics Vol 12 No 2 (2001): Vol. 12 No. 2, April 2001
Publisher : Institut Teknologi Bandung

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Abstract

We report in this work the results of fabricating high quality MEH-PPV and MEH-PPB thin films using spincoating method by proper choice of a solvent, weight concentration and spinning speed. It is found that the films prepared from toluene solutions of weight concentration around 5 % at spinning speeds of 2000 rpm show the highest quality of uniform thickness of d = 540 nm for MEH-PPV and d = 450 nm for MEH-PPB with normalized surface roughness (Ra/d) of 0.3 % for MEH-PPV and MEH-PPB.
Effect of Growth Temperature on Crystalline Structure of YBa2Cu3O7-δ Thin Films Deposited by MOCVD Method Using a Vertical Reactor with a Flow Guide Eko H. Sujiono; T. Saragi; P. Arifin; M. Barmawi
Indonesian Journal of Physics Vol 12 No 2 (2001): Vol. 12 No. 2, April 2001
Publisher : Institut Teknologi Bandung

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Abstract

Effect of growth temperature on crystalline structure of YBCO thin films have been studied by a MOCVD method using a vertical reactor with a flow guide. At growth temperature between 600°C and 675°C, the films are composed of a mixture of a-axis and c-axis oriented phases, while at growth temperature of 700°C or higher, the a-axis-oriented phase disappears. At these growth temperatures, only c-axis-oriented phases are existing on the films. Film grown at 680°C or higher have the composition of Y : Ba : Cu is 1 : 2 : 3, as confirmed from EDAX spectra. Films deposited at 700°C have critical temperature around 87.4 K.
Simulasi Penyebaran CO2 di Semarang Dengan Software LADM Sumaryati Sumaryati; Saipul Hamdi; Nurlaini Nurlaini; Dessy Gusnita
Indonesian Journal of Physics Vol 12 No 2 (2001): Vol. 12 No. 2, April 2001
Publisher : Institut Teknologi Bandung

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Abstract

Simulation of CO2 dispersion has been carried out for Semarang region and its surrounding which covers area of (50 x 50) km2, in September 1998 (represent dry season), by using software of LADM that developed by CSIRO, Australia. Aerology data, except wind data, for this simulation is observed by launching radiosonde at Ahmad Yani airport area (110,4°E and 7,0°S), and this location is taken as center of the simulation. Wind data is obtained from Meteorological and Geophysics Agency. By simulating two CO2 emission sources that placed in Ungaran regent and north east of Semarang, close by bus terminal of Terboyo, it is found that the CO2 dispersion pattern tends to spread northwards and north-westwards; covering northern and north western of Semarang, Java sea and Kendal Regency. Based on the CO2 dispersion pattern given by LADM and by considering field conditions including topography and CO2 emission sources therefore are measurements of CO2 in six sites in the same season in 1999. Jomblom bay (Kendal), Tanjung Mas harbor, and Graha Padma Settlement represent the spreaded area of CO2 (polluted area of LADM version) that borne in Semarang city. While Candi, Gubug (Grobogan) and Dan Sat Brimob complex represent the unspreaded area of CO2 (cleaned area of LADM version). Dan Sat Brimob and Tanjung Mas harbor are located closed by CO2 emission sources (road and industry). The other sites have no significant pollutant emission sources, thus the CO2 emission sources can be neglected in the sites. Analyzing of measurement of CO2 in the sites show correlation with the dispersion of CO2 pattern of LADM.
Visualisasi Pola Frinji Berbasis Interferometri Optik pada Pengujian Statis dan Dinamis Pelat Aluminium Edi Tri Astuti
Indonesian Journal of Physics Vol 12 No 2 (2001): Vol. 12 No. 2, April 2001
Publisher : Institut Teknologi Bandung

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Abstract

Research on optical interferometry has been applied to examine object deformations caused by static & dynamic loading. This method makes use of coherent beam phase alteration recorded in image recording system. In general, the system consists of three systems i.e. optical system, image recording system, and image processing system. Optical system (optical set-up) will determine the deformation shape, image recording system which function as recording before (initial condition) and after deformation. Image processing system will determine the deformation. By means of static & dynamic tests on aluminum plate, it is shown that this system can lends itself to determine object deformation and has light beam order of accuracy. Therefore, deformation distribution can be quantitatively interpreted by analyzing the fringe pattern.
Inversi Data Magnetotellurik 1-D Menggunakan Metoda Simulated Annealing Akhmad Syaripudin; Hendra Grandis
Indonesian Journal of Physics Vol 12 No 2 (2001): Vol. 12 No. 2, April 2001
Publisher : Institut Teknologi Bandung

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Abstract

This paper describes a non-linear inversion method employing simulated annealing technique that imitates a thermodynamic process in which a substance is cooled down slowly to achieve an equilibrium state with a minimum energy. The method was applied to invert 1-D magnetotelluric data in which the model parameter is resistivity varied with depth. Model perturbations carried out in search for a minimum data misfit. Inversions of synthetic and field data showed satisfactory results. By considering equivalence problems, synthetic models were resolved relatively well with data misfit around 10%. Inversions of field data showed subsurface resistivity distribution that agrees well with the geological condition of the surveyed area.

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