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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:4

Article
Luminescent Plates Doped with Stilbene 420 Dye for Enhanced Silicon Solar Cell Performance: Down-Conversion

Authors: S.H. Al Shaikh Hussin
Pages: 3-8
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Abstract

The luminescent plates down-converting (DC) have the potential to generate more than one low-energy photon for every incident high energy photon by adding laser dyes that have the ability to absorb high energy photons that act in ultra-violet region such as stilbene 420 dye and emit low-energy photons in the visible region and so enhanced conversion efficiency from 2.88% to 3.82% and so achieved an increase in conversion efficiency up to 32.69% .That means the (DC) convert the high-energy solar photons to multiple photons having energy grater than of silicon band gap .The luminescent plates have been prepared by doping the epoxy resin with stilbene 420 dye that is dissolved in methanol in concentration of 1.8×10-3mol/L and different thickness. The optical properties of luminescent plates in silicon solar cell was studied and discussed in door and out door showing an increase in conversion efficiency with the increase in luminescent plates thickness.


Article
Transmission of Compressed Video Signals through Spread Spectrum Channel

Authors: A.K. Alasmari
Pages: 9-16
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Abstract

This research studies the feasibility of devising a compression scheme for video sequences that is robust to fading errors in a spread spectrum environment. Schemes like subband coding and pyramid coding are inherently well suited for SS-CDMA environment and thus, pyramid coding is the chosen spatial decomposition scheme. Interframe coding using the two tap short symmetric filters reduces the complexity of motion adaptation techniques used in the MPEG standards. The various temporal low bands are vector quantized using the frequency sensitive competitive learning algorithm. For the temporal high bands, a simple method of geometric vector quantization is implemented. The coded bands are tested for robustness over a multi-path-fading channel at a vehicle speed of 65 mph. The simulation of channel is done according to the specifications of North American Digital Cellular Standard IS-95. The reconstruction of the coded bands results in image frames with average PSNR of 26 dB and average bit rate of 0.25 bpp. The subjective quality of these images is found to be satisfactory.


Article
A CPW-Fed Printed Monopole Ultra-Wideband Antenna with E-Shaped Notched Band Slot

Authors: E.S. Ahmed
Pages: 17-21
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Abstract

A coplanar waveguide (CPW) fed printed monopole ultra-wideband antenna with E-shaped notched band slot is presented. This antenna is fed by a 50 ohm CPW line and it is fabricated on the FR-4 substrate with a thickness of 1.5 mm and relative dielectric constant of 4.4. Two modifications are introduced on this antenna to improve its operating bandwidth. The first one is to remove a 90o angles from the two upper corners of the ground plane by blending them in a radius of 10mm. The second modification is to chamfer the feed edges at the patch. All simulations in this work were carried out by using CST Microwave StudioTM package. Compared with the recently proposed antennas, the proposed antenna has wide bandwidth with acceptable returned losses, compact in size and easy design, easy controllable band-notch characteristics and good gain characteristics over the entire desired bandwidth.


Article
Optical and Electrical Properties of Zinc Oxide Films Prepared by Spray Pyrolysis

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Abstract

The structural, optical and electrical properties of ZnO:In thin films prepared by spray pyrolysis method are examined. The used spray solution (0.2M) was prepared by adding indium chloride InCl3 to the precursor of zinc acetate dissloved in mixed solution 80% H2O: 20%CH3OH. The XRD patterns for incorporated ZnO film with different concenteration of indium shows three addional peaks (100), (101) and (110) over the only one (002) appeared in pure ZnO. The intensities of these peaks are increased gradually with indium concentration while the (002) peak decrease to its minimum value at 3% In. The resistivity of ZnO films was improved by doping from 2.25x102 E.cm for undoped to the minimum value at 2% doping concentration 2.6x10-2 E.cm. The optical bandgap of all films has no change by In addition and shows sharp absorption edge at 380nm.

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