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Iraqi Journal of Applied Physics

المجلة العراقية للفيزياء التطبيقية

ISSN: 18132065 23091673
Publisher: iraqi society for alternative and renewable energy sources and techniques
Faculty:
Language: English

This journal is Open Access

About

The Iraqi Journal of Applied Physics (IJAP) is a peer reviewed journal of high quality devoted to the publication of original research papers from applied physics and their broad range of applications. IJAP publishes quality original research papers, comprehensive review articles, survey articles, book reviews, dissertation abstracts in physics and its applications in the broadest sense. It is intended that the journal may act as an interdisciplinary forum for Physics and its applications. Innovative applications and material that brings together diverse areas of Physics are particularly welcome. Review articles in selected areas are published from time to time. It aims to disseminate knowledge; provide a learned reference in the field; and establish channels of communication between academic and research experts, policy makers and executives in industry, commerce and investment institutions. IJAP is a quarterly specialized periodical dedicated to publishing original papers, letters and reviews in: Applied & Nonlinear Optics, Applied Mechanics & Thermodynamics, Digital & Optical Communications, Electronic Materials & Devices, Laser Physics & Applications, Plasma Physics & Applications, Quantum Physics & Spectroscopy, Semiconductors & Optoelectronics, Solid State Physics & Applications, Alternative and Renewable Energy, Computers Networks and Applications.

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Contact info

P. O. Box 55259,
Baghdad 12001,
Iraq
Website: www.iraqiphysicsjournal.com
Email: admin@iraqiphysicsjournal.com
Email: editor_ijap@yahoo.co.uk

Table of content: 2010 volume:6 issue:2

Article
Numerical Model to Estimate the Potential Changes within Laser-Solid Surface Interaction Zone

Authors: N.I. Naji --- A.I. Ahmed
Pages: 3-11
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Abstract

In this work, a model is proposed to provide an estimation of the temporal and spatial changes of the potential within the interaction zone between laser and metal surface. The model depends on the real experimental data which were measured around the interaction zone. This model provides an estimation of the charge involved and considers the presence of the hole created by the interaction. For the first time, it provides the spatial and the temporal variation of the potential which reflects the electric forces and temperature at the interaction zone. It also gives a clear insight of the position of the Knudsen layer. The estimated maximum potential is more than ten times the potential at the surface boundary. This implies that surface potential is due to the interaction of the surface with the plasma rather than the usually believed thermionic emission.


Article
Curvelet-Based Optical Flow Estimation Algorithm Based on Central Derivatives

Authors: A.A. Sabri
Pages: 13-18
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Abstract

An approach is developed for computing optical flow in the differential framework for global models. This is achieved using schemes for the computation of the derivative using 4-point central differences filter. The proposed algorithm is compared with the most recent algorithm that is based on multiwavelet and it is found that the proposed algorithm is better than that based on multiwavelet in terms of results and required execution time. The algorithm developed in this paper is performed using MATLAB version 7 and implemented on Pentium 4, 1.7 GHz, 256 Mbyte RAM computer.


Article
Design and Analysis of Special Small Size Cross Dipole Antenna

Authors: F.J. Jibrael
Pages: 19-23
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Abstract

In this paper, a crossed dipole antenna combined with the quadratic Koch curve geometry, which has a novel configuration, is proposed and investigated for low profile and multi-band performance in communication systems. The proposed antenna has operating frequencies of 1.543GHz, 2.537GHz, 3.038GHz, 3.469GHz and 3.769GHz. The field pattern of the proposed antenna is described and simulated in the three planes: XZ-plane, YZ-plane, and XY-plane. The radiation characteristics, VSWR, reflection coefficients, and input impedance of the proposed antenna are described and simulated using the 4NEC software package.


Article
Microstructural Study of Copper-Carbon Composite Interface

Authors: A.A.R. Abdullah
Pages: 25-29
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Abstract

Graphite is a very attractive candidate for copper-metal matrix composites. However, copper does not wet graphite, which makes the production of copper-graphite composites difficult. Because of the strong possibilities of these combinations in forming highly desirable composites, copper-carbon composites prepared by hot uniaxial pressure were investigated. The copper-carbon interface is of the samples was examined microscopically using optical microscopy. The observed microstructure at copper interface is composed of copper-carbon interaction layer. The adhesion between copper and graphite was achieved. However, there is no intimate contact between copper and graphite film at interface. To determine the diffusion of carbon through copper matrix by X-ray diffraction was used.


Article
Determination of The Satellite Images Orientation Using DCT Coefficients

Authors: H.M. Abdul Jabar --- M.I. Malik
Pages: 31-34
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Abstract

In this research a new method that determine the difference in orientation between two images (windows) using the DCT coefficients as descriptors is present, where the four operators that may change the orientation between the two images (windows) is studied by analyzing the new distribution of the DCT coefficients after applying each of them or their combinations. To determine the difference in orientation using the new distribution of the DCT coefficients, a new criterion is proposed which uses the sign changing in certain DCT coefficients as a pattern for that difference, and according to the results it success to determine the difference in the orientation between two images (windows) in very fast and accurate manner that invariant to the size and the details of the image (window).

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