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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: 2011 volume:7 issue:2

Article
Dipole Antenna with Fractal Koch Curve Geometry for Multiple Frequency Applications

Authors: A.A. Sabri --- F.J. Jibrael --- S.D. Sateaa
Pages: 3-9
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Abstract

This paper presents the analysis, simulation, and design of a small size, low profile, multi-band third iteration quadratic Koch fractal dipole antenna. The proposed antenna design, analysis and characterization have been performed using the method of moments (MoM) technique. The new designed antenna has operating frequencies of 960 MHz, 1514 MHz, 2914 MHz, 3274 MHz, and 3480 MHz with acceptable bandwidth, which has useful applications in wireless communication systems, and at these frequencies the proposed antenna has reflection coefficient < -10 dB (vswr < 2). The radiation characteristics, vswr, gain, radiation efficiency, and reflection coefficient of the proposed antenna are described and simulated using 4nec2 software package.


Article
HAZ and Melt Limits of 3-D CO2 Laser welding

Authors: A.K. Hamoudi --- W.K. Hamoudi --- S.A. Salih
Pages: 11-17
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Abstract

An analytical and numerical 3-D model for keyhole CO2 laser welding of thick C/Mn steel sheets is constructed to study the heat affected zone (HAZ) and melt limits. Simulation results are compared with experimental investigations under variety of laser material processing conditions. The model combines a moving point source for the top part of the weld and a moving line source for the parallel sided region of the weld. The good match of theoretical and experimental results makes the model a good tool to predict the HAZ volume in which microstructure changes may occur. Such prediction is useful in the investigation of hardening and the cracks formation during laser welding.


Article
Development of an Inverted Optical Tweezers with Full Motional Control

Authors: H. Sridar
Pages: 19-25
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Abstract

A working optical tweezers setup was created and optimized by maximizing the gradient force. Yeast cells were successfully trapped and manipulated three-dimensionally. The trap’s radius of control was approximately 5μm and the stability of the trap lasted greater than an hour. Thirty percent power efficiency was achieved by careful alignment procedures. The tweezers exerted a 0.9pN force when manipulating particles on the xy-plane and a 0.4pN force when manipulating particles up the z-axis. Both forces were within the required range for optical manipulation techniques in the biological field


Article
Nanostructure Dopants TiO2 Films for Gas Sensing

Authors: A.J. Haider --- R.M.S. Alhaddad --- K.Z. Yahya
Pages: 27-31
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Abstract

Nanostructure TiO2 doped with noble metals such as (Ag, Pt, Pd, Ni) thin films were prepared by Pulsed Laser Deposition (PLD) on SiO2 and Si (111) substrates. The thin films structures were determined by X-ray Diffraction (XRD). XRD pattern shows an increase in the average size of the crystalline grains with the range (11.6-25) nm in the all film samples. The morphology properties were determined from Atomic Force Microscopy (AFM), which shows that the grain size of the nanoparticles observed at the surface depend on the type of metal dopant.TiO2 doped with 3 % Pt metal has the smallest grain size of (11.6nm ) and RMS roughness values of (28 nm). The produced thin films in this study have been exposed to 50 ppm CO gas concentration.TiO2 doped with noble metal has sensitivity of higher than pure TiO2 .TiO2 doped with Pt metal deposited on Si (111) has 23 % maximum sensitivity to CO gas with optimum operation temperature of 250°C.


Article
Nano/Micro Surface Texturing and Enhancing of Photovoltaic Cells Efficiency by Using UV Femtosecond Laser Pulses

Authors: K.A. Alnaimee
Pages: 33-36
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Abstract

A fast laser texturing technique has been utilized to produce micro/nano surface textures in Silicon by means of UV femtosecond laser. We have prepared good absorber surface for photovoltaic cells. The textured Silicon surface absorbs the incident light greater than the non-textured surface. The results show a photovoltaic current increase about 21.3% in toe dimension laser textured area.

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