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Indonesian Journal of Physics (IJP)

ijp
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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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Characterization of Subsurface Coal Using Seismic Tomography : a Case Study in Muara Enim South Sumatera Bagus E. B. Nurhandoko; Syahrul Mubarok; Indriani Sukmana; Fajril Ambia; Budi Sulistyanto; Syafrizal Syafrizal; Y. Wiyanto; Hussein Rudiyanto
Indonesian Journal of Physics Vol 20 No 2 (2009): Vol. 20 No. 2, April 2009
Publisher : Institut Teknologi Bandung

In recent years, coal as well as coal bed methane becomes important energy resources. Therefore, the characterization of coal seam is also important in predicting the quality, porosity and pore’s fluid of CBM’s reservoir. Seismic wave is very important parameter to characterize reservoir’s properties of coal bed methane as well as quality of coal. In this paper, we show methodology to image the subsurface velocity using seismic tomography. It is very useful for characterizing the coal’s seam as well as to detect the position of intrusion body. A case study was carried out in Suban Block, Muara Enim Sumatera. This coal mining block contains igneous rock intrusion which becoming main control of coal’s quality. Coal which is close with intrusion body usually has better quality than far zone. To acquire the data, we used 48 channels of seismic recorder controlled by telemetry for controlling the shot and first break. Then, data are processed by Fresnel interpolated wave-path (FIW) wide-band inversion tomography. The results show that the intrusion body can be imaged clearly and the seam coal can be delineated from well information. The information in well controls are quite match with tomography results.

Effect of Alkali Compound on Morphology and Luminescence Intensity of Europium-doped Yttria Astuti Astuti; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Luminescent particles of europium-doped yttria (Y2O3:Eu) have been synthesized by heating nitrous precursors in a solution of polyethylene glycol (PEG) matrix containing alkali compound (LiOH, NaCl, KCl, and CaCl2). High luminescence intensity at around 612 nm contributed by electron transitions in Eu3+(5D0 → 7F0, 5D0 → 7F1,5D0 → 7F2, and 5D0 → 7F3) were observed. The highest intensity was observed in samples prepared using Li compound, but he smallest particle size was observed in samples prepared using Ca compound. This approach is promising for production of submicrometer down to nanometer-sized Y2O3:Eu particles that have both small in particle sizes and high luminescence intensity which is potential for use in development of luminescence ink that can be adapted to the current ink jet printing technology.

Application of TALYS code for Calculation of Fission Cross Section and Fission Yield of Several Heavy Nuclides Yuda S. Perkasa; Rizal Kurniadi; Abdul Waris
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Nuclear data evaluation for fission cross section and fission yield had been performed by many investigators using different models of approximation theoretically. These models are encapsulated and implemented into computer codes to perform more robust nuclear reaction data calculations. TALYS is one of most successful nuclear reaction codes that used to determine fission cross section and fission yield. In this paper, TALYS code was used to calculate some fission reaction including Am-241 (n,f), Th-232 (n,f), and U-235 (n,f). These calculations are performed using different set of reaction mechanism and optical model parameter adjustment, such as fission barrier parameter, level density parameter, transmission mechanism, and so on. Reaction mechanism and parameter adjustment are selected based on reaction characteristics to obtain more accurate and reasonable result. The accuracy of calculation result are heavily depend on the reaction mechanism selection and parameter adjustment. All obtained results have been compared with ENDF nuclear data library.

Calculation of Level Density Parameter of Nuclear Reaction Using Neural Network Rizal Kurniadi; Yuda Satya Perkasa; Abdul Waris; Suwoto Suwoto
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Level density parameter (LDP) calculation is dependent upon shell correction value, which usually is obtained by using Strutinsky method. The Strutinsky method is method that uses energy levels from certain potential as main input. Therefore for each mass number it strongly needs the energy levels calculation. The energy levels computation is time-consuming process; hence, the new application of computation technique is needed to reduce computation time. This paper explains the application of neural network in LDP calculation. Based on knowledge from box type and harmonic potentials, LDP is predicted by using arbitrary potential

Magnetic Anisotropy and the Paleosecular Variation Record in Stalagmites from Njirak Cave, East Java: The Effect of Detrital Magnetite Emplaced in Small Cavities by Flooding Events Satria Bijaksana; Siti Zulaikah; Joseph Paul Hodych
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Magnetic anisotropy and remanence were measured for 33 samples from the axis of two stalagmites from Njirak Cave in East Java. All 33 samples were stepwise demagnetized with alternating fields, but only 16 were stable enough to yield reliable characteristic remanence directions. These directions differ, especially in declination, from the present Earth’s field direction and agree for samples of about the same age from both stalagmites, suggesting that the Earth’s field at Njirak Cave maintained a declination averaging 23° and an inclination averaging −23° for most of the past 2,500 years. Anisotropy of magnetic susceptibility is high, averaging 5.8%. The minimum susceptibility axes are nearly horizontal with scattered declinations; whereas the maximum susceptibility axes tend to be steeply inclined (average inclination is 51°). This implies that the long axes of the mainly multi-domain magnetite grains tend to be steeply inclined (rather than horizontal, as expected if the magnetite were in horizontal detrital layers). We suggest that this is due to the magnetite being in flood-emplaced detritus adhering to the steeply-inclined sides of small (2 to 5 mm) cavities that cut across and are sealed off by the stalagmites’ horizontal calcite growth layers. Steeply inclined maximum susceptibility axes should help detect such stalagmites, whose quality of paleosecular variation record may be lowered by magnetite-bearing cavities.

Imaging Subsurface Fracture and Void using Wide-Band Inversion of Fresnel Interpolated Wavepath Seismic Tomography Bagus E. B. Nurhandoko
Indonesian Journal of Physics Vol 20 No 3 (2009): Vol. 20 No. 3, July 2009
Publisher : Institut Teknologi Bandung

Studying existence of fracture, void as well as fault in subsurface are important and it has wide applications. In addition, fracture and void play important role in reservoir productivity as well as in geotechnical application. The problem in imaging fracture and void in subsurface, however, is resolution. It needs high-resolution imaging method laterally as well as vertically. The seismic velocity imaging, however, usually has poor lateral resolution. Seismic tomography provides better resolution than conventional velocity analysis methods. Conventional raypath seismic tomography, however, needs dense as well as high angle and wide measurement configuration that is high cost in field data acquisition. I propose to use Fresnel interpolated wavepath (FIW) wide-band inversion. FIW is an interpolation between imaginary part of Rhytov scattering wavepath and raypath. Then, FIW is combined with wide band inversion procedure to handle sparseness configuration of measurement. By this method, smooth constraint is implemented more naturally by based on wave's spectrum. Furthermore, it can produce more stable inversion procedure. In this paper, Wide-band inversion of FIW tomography is tested into various seismic field data in order to image void, fault and fracture. The results showed that tomography based on FIW could handle the limitation of configuration angle, sparseness configuration and resulting good image. We use many difficult cases of field data such as: subsurface tunnel imaging and also void-fracture imaging in volcanic rock

Bounds on the Higgs mass in the standard model for one-loop and two-loop effective potentials and their perturbative validity Partha Pratim Pal; Subrata Chakraborty
Indonesian Journal of Physics Vol 20 No 4 (2009): Vol. 20 No. 4, October 2009
Publisher : Institut Teknologi Bandung

The purpose of this paper is to obtain the bounds on the Higgs mass in the Standard Model for one and two–loops Higgs potential, which includes the contributions of scalar, vector and fermion loops at one –loop and two-loop levels for a bound on the coupling constant λ given in the work of P. Kielanowski and S.R.Juarez W as 0.369 ≤ λ ≤ 0.613. On the basis of these studies, we obtain the upper and lower bounds on the Higgs mass as 143 GeV ≤ mH ≤ 200 GeV. These results will be very useful to LHC experiments for the detection of the Higgs particle and are matching with the results obtained by a few contemporary workers. We also find that the condition for perturbative validity given by Miller is satisfied, when the Higgs mass is calculated perturbatively from the effective potential given by the mass less φ 4 theory at one and two-loop level.

A Comparative Study of Anopheles Gambiae Male Mosquito’s Response to Frequency Modulated [FM] and Pulse Modulated [PM] Waves at Different Acoustic Frequencies and Distances Maweu Maweu; Muia L. M; Deng A. L
Indonesian Journal of Physics Vol 20 No 4 (2009): Vol. 20 No. 4, October 2009
Publisher : Institut Teknologi Bandung

The efficiency of an electronic device meant to disrupt acoustic communication between male and female Anopheles gambiae mosquitoes was tested by recording approaches of the males towards the device as a function of distance and frequency. Different bioassays were conducted with broadcasts from the device and taped mimics of the female species wing beats at different distances and frequencies. A large number of the males, 85% remained near the broadcast speaker for a significantly longer period when the broadcast sounds of the device were at 380 Hz than at any other frequency range. The taped mimic sounds of the female mosquitoes in flight elicited a maximum response rate of 75 %. A test involving a choice between the device and taped sound mimics by male mosquitoes revealed that a high number (75 %) of them flew towards the device while 10% were attracted by the taped sounds whereas 15 % were undecided and made oscillatory motion between the two sources. Additional bioassays conducted to examine the effect of the device on non-flying males showed that almost 75 % were disturbed and approached the speaker within a distance of 0.5 m, which confirmed a radiative near-field communication for these insects.

Preliminary design study of Long-life Gas Cooled Fast Reactor With Modified CANDLE Burnup Scheme Nur Asiah A; Merry Yanti; Zaki Su’ud; Menik A.; H. Sekimoto
Indonesian Journal of Physics Vol 20 No 4 (2009): Vol. 20 No. 4, October 2009
Publisher : Institut Teknologi Bandung

In this paper, preliminary design study of Gas Cooled Fas Reactors with Natural Uranium as Fuel Cycle Input has been performed. Gas Cooled Fast Reactor is slightly modified by employing modified CANDLE burnup scheme so that it can use Natural Uranium as fuel cycle input. The natural uranium is initially put in region 1, after one cycle of 10 years of burn-up it is shifted to region 2 and the region 1 is filled by fresh natural uranium fuel. This concept is basically applied to all regions. In this case the system has been applied to many power level which results relatively flexible discharge burn-up level up from about 20%HM to 30 %HM.

A Structural Mechanics Approach for the Vibrational Analysis of Single-Layered Graphene Sheets Andika Putra; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 20 No 4 (2009): Vol. 20 No. 4, October 2009
Publisher : Institut Teknologi Bandung

A structural mechanics approach has been employed to analyze the vibrational behavior of single-layered graphene sheets. By adopting this approach, natural frequencies and mode shapes are obtained for different chirality and imposed boundary conditions. Numerical results from the implemented modeling are examined to provide predictive equations for fundamental frequencies of cantilevered and bridged graphene sheets. With the proposed equations, the natural frequencies can be predicted and are comparable to those obtained from theoretical consideration and experimental results.

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Asril Pramutadi Andi Mustari

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+6222-2500834

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Editorial Address
Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA

Location
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Jawa barat

INDONESIA

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Abstract

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Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Asril Pramutadi Andi Mustari

Contact Email IJPhysicsITB@gmail.com

Phone +6222-2500834

Journal Mail Official ijp-journal@itb.ac.id

Editorial Address Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA

Location Kota bandung, Jawa barat INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Asril Pramutadi Andi Mustari

Contact Email
IJPhysicsITB@gmail.com

Phone
+6222-2500834

Journal Mail Official
ijp-journal@itb.ac.id

Editorial Address
Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA

Location
Kota bandung,

Jawa barat

INDONESIA