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Indonesian Journal of Physics (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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Method to Estimate Mechanical Properties of Glulam on Flexure Testing Based on Its Laminae Characteristics and Position Effendi Tri Bahtiar; Naresworo Nugroho; Muh Yusram Massijaya; Han Roliandi; Rentry Augusti; Adi Satriawan
Indonesian Journal of Physics Vol 22 No 2 (2011): Vol. 22 No. 2, April 2011
Publisher : Institut Teknologi Bandung

Glulam strength is affected by its laminae characteristics and position. Modulus of Elasticity and Modulus of Rupture of layer system (including glulam) is usually estimated by Transformed cross section (TCS) method recently. But, TCS does not follow the principal due to its contrary assumption related with the reduction of material’s plane area for laminae with lower E value and the extension of its plane area for laminae with higher E value. In fact the material properties are independent from its shape and size. Therefore, new calculation method is required. As the relevance, this paper discusses the formulation of a new method to determine the E and SR for glulam based on its laminae properties and position. E and SR calculated by TCS and new method give identical values. The new method confirms the independence of E and SR which could not be fulfilled by TCS. According to this fact, TCS could be replaced by new method. The theoretical E value was higher than its coresponding empirical value, but it has high correlation (R2=68.53%). On the contrary, the theoretical SR value was not significantly different from its coresponding empirical values, but they have poor correlation (R2=27.93%). This condition happened because of finger joint effect on the compression and tension side of the sample. Incorporating the finger joint effect into regression analysis, the equation provides very good prediction. The coefficients of determination were 99.58% and 97.19%, for E and SR respectively.

Calculation Procedure for Dynamic Condition of Ion Composition in Cell Walls Altered by Proton Fluxes Idam Arif
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

The calculation procedure has been developed to determine the dynamic condition of the ion composition in cell walls during proton extrusion, known as the Weak Acid Donnan Manning (WADM) model for fluxes. In this model, the walls of plant cells are considered as a system containing weak acid polymers where the interaction of ions obeys the Manning condensation theory and the Donnan theory. When protons are transported across the walls during proton fluxes, the transported proton will interact with the wall ions and alter the ion composition. This depends on the wall parameters such as the concentration of ionisable sites, the pK of the wall weak acid, and the wall linear charge density parameter. When the linear charge density parameter is still higher than the reciprocal of the highest valence of the involve cations, the transported protons during proton fluxes will decrease the wall pH, alter the ion composition in the wall Donnan free space and water free space, and release the condensed cations. Therefore some of the proton fluxes are represented by the flux of the condensed cations outside the walls. However when the linear charge density parameter is less than the reciprocal of the highest valence of the involve cations, there is no condensed cations in the walls so that the transported protons only alter the ion composition in the wall Donnan free space and water free space.

Synthesis of Rutile-Rich Corundum/Rutile Functionally-Graded Materials with Different Precursors Suminar Pratapa; Khusnul Umaroh; Frissa Erina Herdiyanti
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

Synthesis of corundum/rutileFGMS had been done with five repeated infiltrations. Preforms were made from corundum powder which were presintered at 1000°C for 1 hour to obtain green body porosity of around 54%. The infiltration was performed by repeatedly fully immersing the preforms in TiCl3 and Ti(SO4)2 solutions (approximately 20% w/v). The infiltrated preforms were then calcined at 1200°C for 2 hours. Phase characterisation using X-Ray Diffractometry (XRD) indicated that peak intensity of rutile increased with number of infiltration. Further observation showed that maximum gain of rutile was obtained from preforms which were fully immersed in the TiCl3-containing solution. Phase composition study at various depths for the TiCl3-containing samples using XRD showed that the content of rutile decreased with depth from 54% at the surface, 32% at 0.2 mm, 20% at 0.4 mm and 17% at 0.6 mm, while that for corundum increased complementarily. The phase composition results implied that synthesis of rutile-rich corundum/rutile functionally-graded materials has been successful using such precursor with multiple infiltration.

Effect of a Transverse Magnetic Field on Buoyancy-Driven Flow and Heat Transfer in a Porous Trapezoidal Enclosure Habibis Saleh; Ishak Hashim
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

The effect of a magnetic field on buoyancy-driven flow and heat transfer in a trapezoidal enclosure filled with a fluid-saturated porous medium is studied numerically using the finite difference method. The inclined sloping boundaries are treated by adopting staircase-like zigzag lines. The sloping walls are maintained isothermally at different temperatures. The top and bottom horizontal straight walls are kept adiabatic. The results indicate that the heat is transferred almost entirely by pure conduction with a sufficiently large magnetic field. Utilitizing the square geometry is more effective to suppress the heat transfer rate than the trapezoidal geometry.

Synthesis and Characterization of Bi2TixV1-xO5.5-δ as Electrolyte Material in Solid Oxide Fuel Cell Bambang Prijamboedi; Citra Deliana Dewi Sundari; Rolan Rusli; Ismunandar Ismunandar
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

Oxide materials of Bi2TixV1-xO5,5-δ have been synthesized by means of conventional solid state reaction method. Substitution of Ti atom for the V sites leads to the formation of single phase Bi2TixV1-xO5,5-δ material with I4/mmm space group of tetragonal structure as well as gives results in large grain size and good sinterability of the ceramic material. With Ti concentration of x = 0.2, sample without the presence of porous could be obtained. The ionic conductivity of Bi2TixV1-xO5,5-δ increases significantly with the presence of Ti atoms. This Ti substitution also reduces phase transition temperatures in Bi2TixV1-xO5,5-δ materials. The conductivity data and scanning electron microscope images show that the Ti concentration in Bi2TixV1-xO5,5-δ could be applied as much as x = 0.2, which is higher than reported before and it still gives better properties.

The Change in Physical Properties of Bi2Ca2Co2O8 Thermoelectric Materials Induced by Pb and Rare-Earth Dopings Inge Magdalena Sutjahja
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

We report in this paper the change in the physical properties due to dopant effect in Bi2Sr2Co2O8 parent compound system. The doped samples consists of Pb-doped samples (Bi2Sr2Co2O8, x = 0, 0.5, 1.0, 1.5, and 2.0) and RE-doped samples (Bi2-xPbxCa1.9RE0.1Co2O8, RE = Y, La, Pr, Sm, Eu, Gd, and Ho). The structure of this layered oxide system consist of an alternate stack of CoO2 layer and Bi2Sr2O4 block along the c-axis with misfit structure along b-direction. From the analysis of XRD data it is found that the c-axis parameter reduced significantly in the RE-doped samples compared with those of Pb-doped samples, while the value of misfit degree almost the same. The changes in these lattice structures are accompanied by variation in the spin-state of Co-ions and electrical conductivity. We argue that these structural changes and its effect on the electrical transport properties as well as control of the magnetism plays a pivotal role in determining the thermopower in this class of magnetic thermoelectric materials through the entropy of the charge carriers. This, in turn, will determine the thermoelectric performance for application.

Energy of One-Dimensional Diatomic Elastic Granular Gas:Theory and Molecular Dynamics Simulation Siti Nurul Khotimah; Sparisoma Viridi; Widayani Widayani; Abdul Waris
Indonesian Journal of Physics Vol 22 No 3 (2011): Vol. 22 No. 3, July 2011
Publisher : Institut Teknologi Bandung

One-dimensional ideal diatomic gas is simulated through possible types of motions of its molecule. Energy of each type of its motion is calculated by both theoretical and numerical methods. Analytical calculation of kinetic energy of an atom in translational-vibrational motion is not simple, but it can be solved by numerical method using molecular dynamic simulation. This paper justifies that the kinetic energy of a diatomic molecule can be determined by two different approaches which give the same results. In the first approach, the kinetic energy is calculated as a summation of kinetic energy of each atom. In the second approach, the kinetic energy is calculated as a summation of kinetic energy of translational and vibrational motions.

Construction of a generic reference material for gamma ray spectrometric analysis J. M. Kebwaro; N.O. Hashim; A. O. Mustapha
Indonesian Journal of Physics Vol 22 No 4 (2011): Vol. 22 No. 4, October 2011
Publisher : Institut Teknologi Bandung

An artificial reference material (RGMIX) has been constructed from three IAEA materials (RGU-1, RGTH-1, RGK-1). The material is analogous of an environmental radioactive material. The material is systematically analysed on a NaI(Tl) detector using the method of spectrum decomposition. The spectrum of the sample is similar to that of a geological material.

Conductivity Effect on the Capacitance Measurement of a Parallel-Plate Capacitive Sensor System Peyman Azimi Anaraki
Indonesian Journal of Physics Vol 22 No 4 (2011): Vol. 22 No. 4, October 2011
Publisher : Institut Teknologi Bandung

In this article design and operation of a parallel-plate capacitive sensor based on the dielectric capacitance and conductance change of the gap medium is reported. The designed system was used to determine characteristics of different water liquids as a result of the capacitance variations. The air gap capacitance is measured and then by filling the gap with a liquid the capacitance is monitored for different liquids. Proposed sensor is used for the distilled, tap, boiled, and salt water measurements and the capacitance results are compared. A big difference about 45.5µF in capacitance values for the salt and distilled water shows a high sensitivity, which can be used to recognize different water liquids. The experimental results are promising for water liquids and verify the successful operation of such a device as a liquid sensor, a useful method for checking the electrical quality of the water that is required for different applications.

Dynamical Evolution of Sub-km Sized Main-belt Asteroids with Involving Thermal Radiation Effects Budi Dermawan; A. Fermita
Indonesian Journal of Physics Vol 22 No 4 (2011): Vol. 22 No. 4, October 2011
Publisher : Institut Teknologi Bandung

Inconsistencies between asteroid’s evolutionary model and observational results have been convincingly explained by thermal radiation effects that cause asteroids to experience orbital drifts. To investigate influences of the effects, we conducted 10 million yr orbital integration of hypothetical sub-km sized Main-belt asteroids. Numerical integration was run to propagate orbital dynamics of the asteroids by taking into account typical physical parameters of regolith- and basaltic-type surfaces of asteroids. Delivery processes from the Main-belt asteroids to near-Earth space are occurred by the aids of planetary orbital resonances and gravitational perturbations. In general, we find that thermal radiation effects play as an important role in the early evolution (< 1 million yr), which guide the asteroids to follow different evolutionary paths than those of without involving the effects. This study indicates that asteroids whose surface belongs to basaltic-type have higher orbital mobility.

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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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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