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INDONESIA
BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
Arjuna Subject : -
Articles 7 Documents
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Search results for , issue "Vol 14, No 2 (2011): Berkala Fisika" : 7 Documents clear
Cover April 2011 April 2011, Cover
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cover Berkala Fisika, Vol. 14, No. 2, April 2011
Kajian Spektrum Sinar-X 6 MV Menggunakan Simulasi Monte Carlo Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

X-ray spectra produced by Elekta Linac for 6 MV beam  have been evaluated using Monte Carlo simulation. In this simulation, Linac head was modeled using BEAMnrc code. X-ray sepctra, fluence vs position, and energy fluence vs position were determined using BEAMDP code. In this simulation, the SSD (source skin distance) was 90 cm and the field size of radiation was 10 x 10 cm2. Energy electrons arriving at the target (incident electron) was varied 5.7 MeV, 6.0 MeV, 6.3 MeV and 6.6 MeV. As for the radial intensity, FWHM values ​​varied 1.0 mm, namely 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm. X-ray spectra were determined at the surface of the phantom. Iit was found that the curve 6 MV X-ray spectra has a shape not symmetry with an average energy of about 2 MeV. In the spectra there is no energy X-ray radiation value exceeds the kinetic energy of incident electrons. X-ray spectra is not affected by the width of electron beam striking on the target. if the electron energy increases, it will generate increased fluence and energy fluence, but no effect on the penumbra region (the edge of field size). If the electron beam width increases, it will result in the radiation field edge becomes less sharp or penumbra widening. Keywords — Monte Carlo Simulation, X-ray spectra, Linear Accelerator
PENGARUH PENAMBAHAN POLIMER EMULSI VINYL ACECATE CO ACRYLIC PADA TANAH LEMPUNG TERHADAP UJI PERMEABILITAS MELALUI CONSTANT HEAD PERMEABILITY TEST Halauddin, Halauddin; Suhendra, Suhendra
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Permeability is rate of movement an fluid in soil through a media  have relation pore micro and macro way, happen of vertical and horizontal. Permeability of soil depend on pore mean size measure influenced by particle size measure distribution, viscosity, particle form and soil structure. Smaller soil particle size measure, smaller also pore size measure and progressively lower ability of the soil to overcome fluid. This research aim to know the level of permeability coefficient value of soil residing in gristle area slide by pass Bengkulu Kepahiang by using method permeameter of permeability head constant by comparing given by permeability value is emulsion polymer and do not give by type emulsion polymer of  poly vinyl acetate co acrylic (PVA). This research have done in laboratory have the character of pure experiment and conducted sometime. From result of research, obtained that: value permeability of biggest soil before given by emulsion polymer of PVA there are at location III equal to 8,62.10-3 cm/s, and value permeability of smallest soil before given by emulsion polymer there are at location I equal to 3,87.10-3 cm/s. While value permeability of biggest soil after given by emulsion polymer of PVA there are at location V equal to 0,96.10-3 cm/s, and value permeability of smallest soil after given by emulsion polymer there are at location IX equal to 0,10.10-3 cm/s.   Keywords: Permeability, constant head permeability, pore of size,  polymer of emulsion and                     poly vinyl acetate co acrylic (PVA).
Pengaruh Laju Molar Mn Larutan Terhadap Mikrostruktur Lapisan Tipis GaN:Mn yang Dideposisi di atas Substrat Si Menggunakan Metode Sol-Gel Sutanto, Heri; Hidayanto, Eko; Nurhasanah, Iis; Istadi, Istadi
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

A thin layer of material deposition of GaN: Mn by sol-gel method has done using spin-coating technique. Solution of gallium-citrate-amine maganese-Ga2O3 synthesized using as a source of Ga and Mn MnO2 as the source. Solution varied with the mole fraction solution of 60-80% Mn. Brown crystals that formed subsequently dissolved in ethylenediamine to form a gel. Subsequent gel superimposed on top of Si substrates with a spin-coater at a rate of 1100 rpm. Layers formed at temperatures of 900oC and then disintering in UHP N 2 gas environment to form the decomposition of GaN: Mn. The results of spectral analysis of energy dispersive X-ray (EDX) showed incorporation of Mn into the GaN mole fraction increased with the addition of a solution of Mn in the solution used. EDX Test results show that thin films of GaN: Mn impurity contained carbon (C) up to 36.71%. Image scanning electron microscopy (SEM) a thin layer of GaN: Mn shows in general have been obtained surface roughness (rms) morphology of the layer reaches the order of nanometers up to 24.36 nm. From the results already obtained show that the sol-gel deposition method has been able to produce a thin layer of magnetic semiconductors with a nearly homogeneous surface morphology. Thus the sol-gel method could be developed for alternative methods of deposition of thin layers that are economical and simple. Key words: GaN: Mn, CSD, Thin Layer, Mn incorporation.
UJI KECEPATAN REKONSTRUKSI CITRA PADA CT-SCAN METODE BACK-PROJECTION (BP) DAN METODE FILTERED BACK-PROJECTION (FBP) DENGAN PEMFILTERAN PADA DOMAIN SPASIAL Ngurah Sutapa, Gusti; Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

Conventional X-ray have many limitations in describing the object being imaged because of overlap on multiple objects on a single line of projection. To overcome this limitation, the object was expossed in several directions, and then the projections from several directions was reconstructed to get cross-section image. The reconstruction method was widely used filtered back projection method as the development of a simple back projection. In this study will be evaluated the speed of the reconstruction for the back projection method and filtered back projection in the spatial domain. It was conducted for the projection angle from 0 to 180 degree, with interval  25, 20, 15, 10 and 5 degrees. In this research the number pixels was 50x50. It was found that the smaller of the interval of the angle projections, then it will get better results, but it takes longer. From back projection and filtered back projection methods, was obtained if the interval of the angle projections a half times smaller, it will take nearly twice as long of time. It was found that the time difference between back-projection and filtered back projection methods is less than 0.1 seconds. Keywords: Image reconstruction, back-projection, filtered back-projection, convolution
THE ELECTRIC FIELD FORMULATIONS IN THE PLANE-KNIFE CONFIGURATIONS Yoyo Wardaya, Asep; Nur, Muhammad
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

In this paper, we calculate enormous electric field produced by the plane-knife configuration of the plasma generator. The value of electric field is calculated by two ways of configurations, the first is the almost perpendicular form of the Capasitor plates and second the perpendicular one. The result of calculation is the plates perpendicular form will produce higher electric fields than the almost perpendicular case. Key words : Plasma generator,  plane-knife configuration , electric field.
PENENTUAN STRUKTUR KRISTAL AlMg2 ALLOY DENGAN DIFRAKSI NEUTRON Ismul Hadi, Arif; Sumariyah, Sumariyah; Dahlan, M.; Mohtar, Mohtar
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

The determination of crystallography structure of AlMg2 alloy has been done by neutron diffraction. In fabrication process, it was addressed by rolling phases. The first by hot rolling with thickness follows: 8.35 mm; 7.00 mm; 5.6 mm; 2.60 mm; 1.65 mm ± 0.05 at  425 0C temperature extended by cold rolling: 1.65 mm to 1.30 mm ± 0,07 thickness at normal temperature. Counting of the data was started by activate of detector from 110 to 400 angle with 0.075 overstep and preset monitor count of 60,000 at 26 MW. Processing of the data using of microcomputer 16 bit NEC PC-9801 VM2. The results show that the AlMg2 alloy structure are FCC system with lattice parameter (a) = 4.0817 A0.   Keywords: AlMg2 alloy, neutron diffraction, and FCC

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