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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 334 Documents
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Permeability Estimation Based on Pore Radius and Its Distribution Umar Fauzi
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

Hydraulic permeability may be expressed as a function of pore radius. A simple capillary model shows that permeability is proportional to the square of pore radius. This model may be extended by including pore size distribution, so statistical parameters of its pore radius distribution can be considered in permeability estimation. Another recent approach, the so-called effective medium approximation uses pore radius distribution as an input parameter for permeability calculation. Permeability can be estimated with the help of the above approaches as far as the pore radius and its distribution are available. Pore radius distribution can be generated using digital image processing. By defining pore radius as the ratio of image pore area and its circumference, pore size distribution of rock image can then be created. Estimation of permeability by means of the effective medium approximation gives better results than the simple capillary model as well as its extended formulae. Definition of pore radius has however significant influence on the results of estimation, since different definitions of pore radius produces different distributions.
Aplikasi Persamaan Peng–Robinson Dalam Memperkirakan Korelasi Konstanta Kesetimbangan Sistem Gas Kondensat Alamta Singarimbun; Amiruddin Takda; Tutuka Ariadji
Indonesian Journal of Physics Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002
Publisher : Institut Teknologi Bandung

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Abstract

The pressure of gas condensate reservoir will decrease at the production process. The reduction of pressure under dew point causes gases to condensate into two phase systems i.e. vapor-liquid and its composition. The prediction of phase equilibrium constant of vapor liquid and its compositions is obtained by applying Peng-Robinson equation. Especially for component of hepthane plus (C7+), a new correlation is proposed to determine equilibrium constant gas-liquid and its composition. The data used in this study was field data from several gas wells in Sumatera and Java. The results are an equilibrium constant and a composition as a function of pressure, temperature, specific gravity and molecule weight. The use of a new correlation to other components of gas condensate system (C1–C6 and CO2–N2), gives a good agreement with the standard data in a PVT chart.
Simulasi Reaktor MOCVD Dengan Menggunakan FEMLAB Budi Mulyanti; Fitri S. Arsyad; Soegianto S; M. Barmawi; Sri Jatno W
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Numerical simulation is presented in order to have optimal growth parameters when thin film GaN is grown in the MOCVD reactor. The simulation is performed by changing the growth parameters such as diffusivities and flow rates of gases, and the reactor’s geometries. Gases that are used in this simulation are trimethyl gallium (TMGa) and ammonia (NH3) as source gases and nitrogen (N2) as a carrier gas. The uniform thin film is obtained from this simulation, when the growth parameters are 0.1 m2s-1, 10-3ms-1, and 3.5 cm for gas diffusivity, gas flow rate and distance between reactor neck and substrate, respectively.
Fraktal dan Variabilitas dalam Siklus Bintik Matahari Dhani Herdiwijaya; Baju Indradjaja
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Monthly sunspot numbers during period 1749 to 2000 were used to determine their fractal properties. Lomb’s algoritm and Morlet wavelet were applied to detect the distinct period of 11 year. By using Detrended Fluctuations Analysis (DFA), fractal dimension was measured. It is shown that during the last two centiries, 11-year wavelet amplitude showed doubled increment, in contrast with Gleissberg period. The evolution of fractal dimension varied in between 0.5 to 1.5, which imply that sunspot number time series are nonstationary and correlated to each other within 132-year period. The detected cross-over feature at D=1.3 corresponds to 11-year period and granulation size.
Pemodelan Inversi Non-Linier dalam Geofisika Menggunakan Algoritma Rantai Markov Hendra Grandis
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

In the frame of Bayesian inference, the inverse problem solution is described by posterior probability density function (PDF) in the model space. Estimation of PDF in a multidimensional space is based on a Markov chain having invariant probability identical to the posterior PDF of the model. Extensive exploration of the model space using a stochastic technique is expected to circumvent local minima. The Markov chain algorithm has been applied to non-linear inversion of magnetotelluric (MT) data using 1-D and 2-D models with satisfactory results, i.e. synthetic models have been recovered.
Fluks Poynting Gelombang Whistler Titiek Setiawati
Indonesian Journal of Physics Vol 13 No 3 (2002): Vol. 13 No.3, Juli 2002
Publisher : Institut Teknologi Bandung

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Abstract

The whistler wave which exists in the ionosphere and magnetosphere spans in the VLF and ELF. During its propagation the wave can undergo an attenuation. The attenuation that is represented as Poynting flux is derived from the electric and magnetic fields components along with their conjugate components. Poynting flux profile in the lower ionosphere (D layer) can be simulated by using the modification of the full wave method.
Model Estimasi Kondisi Kering Berdasarkan Data Hujan Lima Harian R. Kartika Lestari; Bayong Tjasyono HK
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Present weather condition depends on the previous weather conditions. In this paper, we discuss the probability of dry condition using a second order Markov chain probability model. The results are the mathematical equations and graphics of four conditions of the probability of dry pentad (5-day) by knowing two previous pentads. All of the graphics have same models, but the equations are different in coefficients. The result is that probability of KKK is greater than the probability of dry pentad knowing previous two pentads are not whole dry. The maximum probability of dry pentad (KKK) occurs from 40th pentad up to 60th pentad or in the middle of July up to the end of October.
Model Frekuensi Kritis Lapisan Ionosfer Pada Kawasan Timur Indonesia Habirun Habirun; Anwar Santoso
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

The ionospheric layer have been influenced by the ionosphere daily variation especially variation of the result of solar effects and variation of which have been caused by moon pulling energy so that the characteristic of the foF2 critical frequency ionospheric layer characteristics a certain pattern. Besides that disturbance, the ionospheric layer can also be influenced by pertubation of the earth’s magnetic field variation and local time. Therefore on this description will be discussed of the foF2 critical frequency ionospheric layer model on Indonesia east region with using to polinom tree order model. The model calculation is based on geographic latitude that correlated to earth’s magnetic field variation and local time.
Penentuan MUF Menggunakan Model Sederhana Ionosfer Regional Indonesia Buldan Muslim
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Indonesian simplified ionospheric regional model (ISIRM) is modified of simplified ionospheric regional model (SIRM) which was originally developed for modeling the most relevant ionospheric characteristics over Europe for radiocommunication purposes. The model, based mainly on a Fourier expansion of a reference previous data set, have a good agreement at midlatitude region. This paper describe the modeling of (ISIRM) based on ionospheric data observation at low latitude around Indonesian region: Manila, Singapura, Vanimo, and Darwin, for two of important ionospheric parameter needed for maxmimum usable frequency (MUF) determination i.e: foF2 and M(3000)F2. The MUF from ISIRM is also compared with MUF observation from Manado-Sumedang Oblique ionosonde.
Metoda Web Komputasi Untuk Perhitungan Intensitas Bencana Kekeringan Di Wilayah Indonesia Plato Martuani Siregar; The Houw Liong; Bayong Tj H.K
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Meteorological computation needs networking of database in synoptic analysis,that computated by single computer is wided to networking because it’s needed information for data processing that simultaneously,past,and accurately for weather prediction. Computation by internet is applied in CGI Language and database manajement by MySQL. All of atmospheric dynamics equation is implemented by CGI (php or perl programming). Computations of drought intensity use rain factor or drought index that develoved by climate elements,i.e,temperatures and rain fall. Value of drought index is less than 5.0 for drought condition,which rain fall in mm and temperature in Kelvin. El Niño event causes drought in Eastern and Southern of Indonesian region than non-El Niño year. El Niño gives drought for Indonesian region,but not all of drought caused by El Niño event,those are other factor for instantce east monsoon.

Page 4 of 34 | Total Record : 334

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