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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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Development of Visible Light Absorption Measurement for Concentrated Dye Solution based on Attenuated Total Reflection Technique and Improvement on its Analysis Method Hendro Hendro; Mitra Djamal; Wirawan Wirawan; Rahmat Hidayat
Indonesian Journal of Physics Vol 19 No 2 (2008): Vol. 19 No. 2, April 2008
Publisher : Institut Teknologi Bandung

An absorption measurement working in ATR (Attenuated Total Reflection) mode has been design for characterization of concentrate dye solution. The system consists of a visible light system as polychromatic wave source, an ATR plate made up from glass or polymer, a spectrometer with a CCD detector. The system is connected to a computer for measurement and data processing. Some commercial inks measured by this ATR system showed absorption spectra which are in agreement with the color of the inks. The absorption parameter will be determined from the incident and reflection beam intensities measured at incident angle larger than the critical angle. We have also carried out Poynting vector analysis and we will show that the energy flow in the normal direction of the interface is not zero. The energy flow, however, decreases along the normal direction of the interface, indicating energy loss due to light absorption in the sample medium. The amount of energy loss depends on the attenuation index or absorption parameters, which is important for formulating the relation between the measured intensities and absorption parameters.

A Preliminary Result of Seismoelectric Responses Study on Shallow Fluid-Saturated Layer: Numerical Modeling Using Transfer Function Approach Alamta Singarimbun; Harry Mahardika; Wahyu Srigutomo; Umar Fauzi
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

Seismoelectric phenomena occurs when a seismic wave propagating in a fluid-saturated medium and crossing an interface of different fluid-saturated mediums that induces electrical field or cause radiation of an electromagnetic wave where only the electric part is being measured. In this paper, we present our research progress on seismoelectric imaging of shallow fluid-saturated layers. The progress mainly discusses on our finite-difference algorithm which provides an alternative method to simulate seismic wave propagation in fluid saturated porous media generating electric fields through an electrokinetic mechanism called seismoelectric coupling. The target of this numerical simulation is to see whether the seismoelectric responses of coseismic field and interface boundary effect can be image on the seismoelectrogram. The simulation begins with the calculation of seismic displacement by using the classical homogeneous formulation. Next, we calculate the seismoelectric responses using the seismoelectric transfer function. The algorithm is then used to simulate seismoelectric responses created from various conditions of finite-infinite and finite-infinite sand-clay model, surface to downhole and crosshole configurations.

Automatic and Real-time Processing of Tilt Records for Prediction of Explosions at Semeru Volcano, East Java, Indonesia Hery Kuswandarto; Muhamad Hendrasto; Masato Iguchi
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

Eruptive activity of Semeru Volcano, East Java, Indonesia, is characterized by intermittent occurrence of strombolian and vulcanian types in intervals of 15 – 45 minutes. The explosive eruptions accompany explosion earthquakes and tilt changes of ground around the summit crater. Prior to the explosions (16 – 300 s before), gradual upward tilts of the crater side were detected with amounts of 0.3 – 20 nrad. The upward tilts turned to downward after start of explosive eruptions and tilt decreased by 0.7 – 50 nrad for 30 – 70 s. In order to detect the precursory tilt changes in real time automatically by using the tilt record, software coded by Visual Basic was developed. The software receives UDP packet data from A/D converter for the tiltmeter and shows the record on PC display. The software judge stages of volcanic activity (pre-eruption or eruption) based on the tilt change. In a test, 72% of increase in tilts prior to explosions was successfully detected.

Focal Mechanism of Volcano-tectonic Earthquakes at Merapi Volcano, Indonesia Sri Hidayati; Antonius Ratdomopurbo; Kazuhiro Ishihara; Masato Iguchi
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

Merapi (2968 m), located in central Java, is one of the most active and dangerous volcanoes in Indonesia. The volcano has repeated episodes of dome growth and collapse, producing pyroclastic flows during historical time. Volcano-tectonic (VT) earthquakes have been classified into deep (VTA) and shallow one (VTB). Since August 2000, number of VT events (M=1.0-1.6) had increased, and pyroclastic flows have successively occurred from the middle of January, 2001. The focal zone vertically extends to about 4 km deep beneath the summit. VTA events are located at the depth 2.2-4.1 km and the VTB ones at the depth shallower than 1.3 km. An aseismic zone is observed around 1.3-2.2 km deep between the hypocenter zones of the two types of VT earthquakes, interpreted as shallow magma storage. Focal mechanism of VT events was estimated by using both polarity and amplitude of P-wave first motions at 4 seismic stations, assuming double couple mechanism and homogenous medium. Determined focal mechanisms for VTA events are of normal-fault types. VTA events might originate by increase in horizontal tension when magma rose up from deeper portion. Orientation of their T-axes is nearly horizontal in NEE-SWW direction which might be affected by the E-W regional tectonic stress. As for the VTB, normal fault types dominate the deep VTB zone, while at the shallow part, both reverse fault and normal fault types are originated. The pressure increases at shallow magma storage may cause generation of deep VTB events of normal fault types. As VTB events frequently originated, corresponding to increase of multiphase (MP) events which are related to growth of lava dome, shallow VTB events of reverse fault type might be generated by horizontal compression related to pressure decrease in magma conduit due to extrusion of lava and gases, and occasionally by pressure increase at the shallow part due to accumulation of magma or volcanic gases.

Mechanical Alloying of Fe-C System Based Alloy Nurul Taufiqu Rochman
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

This paper reviews the research of the author’s group regarding mechanical alloying (MA) of Fe-C system based alloy over the last ten years. Powder mixtures of Fe-xC-yM (x and y=0~6 mass %, M: additive element such as Mn, Si, Cr) were mechanically alloyed (MAed) by using a planetary ball mill under Ar gas atmosphere for various time up to 100 h. The MAed powders then were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal analysis (DTA). First, effect of MA time on powders particles was described. Effects of other MA conditions such as temperature, rotation speed and additive elements were then discussed in detail. In the Fe-C system based alloys, amorphization of graphite powders occur first during the early stage of MA and super-saturated iron solid solution is then formed and at the same time, the crystallite size becomes smaller. The carbon content reaches its limitation (about 1.30 at %). The condition of MA gave an effect to the alloying process.

Structural Characteristics of Carbon Nanotubes Fabricated Using Simple Spray Pyrolysis Method Khairurrijal Khairurrijal; Mikrajuddin Abdullah; Memoria Rosi; Fatimah A. Noor
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

A simple spray pyrolysis method has successfully used to synthesize carbon nanotubes (CNTs). Their structural characteristics were characterized by employing field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, and X-ray diffraction (XRD) methods. FE-SEM images confirmed that the diameters of CNTs were in the range of 20 to 80 nm. The average diameter of CNTs increased considerably as the growth temperature increased (above 700 oC). The changes in growth time and ferrocene mass altered the average diameter of CNTs slightly. EDX analysis and XRD patterns indicated that Fe2O3 and Fe3O4, which originate from the oxidation of ferrocene catalyst, are the main impurities of the CNTs. The concentrations of Fe2O3 and Fe3O4 became lower and higher, respectively, for the growth temperatures higher than 700°C because Fe2O3 is the most stable at high temperatures.

Evaluation of Pb-Bi-Water Direct Contact Boiling Flow in a Vertical Circular Channel using Drift-Flux Model Novitrian Novitrian; Minoru Takahashi
Indonesian Journal of Physics Vol 19 No 4 (2008): Vol. 19 No. 4, October 2008
Publisher : Institut Teknologi Bandung

The characteristics of Pb-Bi-water boiling two-phase flow were investigated in a vertical circular channel. Water was injected into Pb-Bi to circulate Pb-Bi in a loop with an effect of steam lift pump. Pb-Bi flow rates were measured and analytically estimated using balance condition between buoyancy force and pressure losses. The drift-flux model was used to determine void fraction with assumption that bubble sizes were dependent on the fluid surface tension and density ratio of Pb-Bi to steam and water mixture. The result of analysis shows that the deviation from the experimental data was less than 20%.

Marine Seismic Tomography for Detecting Fracture and Void of Subsurface Seabed : a Theoretical Framework Development and Application of Wide-Band Fresnel Tomography Bagus E. B. Nurhandoko; Fajril Ambia; Kaswandhi Triyoso; M. Thurisina Choliq; Mahatman L. Budi; Asep Suhendi; Wahyu E. Abdianto
Indonesian Journal of Physics Vol 19 No 4 (2008): Vol. 19 No. 4, October 2008
Publisher : Institut Teknologi Bandung

Fracture as well as void can generate unstable structure in offshore building. We use seismic tomography based on scattering wave instead of conventional raypath seismic tomography. Conventional raypath tomography usually needs dense source-receiver configuration as well as wide-angle measurement. Therefore, it will be high cost in field data acquisition. We propose scattering wavepath tomography by means of 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. In this paper, we showed some applications of Wide-band inversion of FIW tomography in imaging fracture and void in marine carbonate sea bed.

Some Gauge Related Aspects in Gauge Theory Triyanta Triyanta
Indonesian Journal of Physics Vol 19 No 4 (2008): Vol. 19 No. 4, October 2008
Publisher : Institut Teknologi Bandung

Gauge freedom is one important property of gauge theory. It enables one to choose gauge fields that fulfill a certain condition for conveniences. Thus, gauge freedom leads more fruitful and interesting development of gauge theory. In this paper we will discuss some gauge condition related aspects where the generalized gauge is taken into consideration. More attention will be given to the FS gauge.

Determination of Energy Dependence Level Density Parameter and its Application in Fission Products Calculation of Pu-238 Abdul Waris; Rizal Kurniadi; Yuda S. Perkasa; Suwoto Suwoto
Indonesian Journal of Physics Vol 19 No 4 (2008): Vol. 19 No. 4, October 2008
Publisher : Institut Teknologi Bandung

The energy dependence of level density parameter has been calculated using extended wood-saxon potential. The extended version of potential has deep well parameter that is independent to the nucleon density. The potential is pure central interaction. Although the potential is different from mean field theory, it gives the better result than that of the reference input parameter library-2 (RIPL-2). The application of the level density parameter results in small discrepancies from ENDF results. This method has been adopted in example for calculating fission products of Pu-238.

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Asril Pramutadi Andi Mustari

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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
Kota bandung,

Jawa barat

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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