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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:4

Article
Empirical and Simulation of Thermal Insulator of SWCNTs – Ceramic/Polymer Nanocomposites

Authors: I.F. Hussen
Pages: 3-9
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Abstract

Ablation rate and thermal conductivity coefficient for phenol formaldehyde type resole resin reinforced with single well carbon nanotubes (SWCNTs) and porcelain have been studied via oxy–acetylene flame and Lee’s disc, techniques respectively. Thermal conductivity results show, that the values increase progressively by succession of volume fraction of SWCNTs. Ablation rate behaves inversely, where it drops at high volume fraction of SWCNTs. Simulation of thermal conductivity results, which are calculated according to microstructures model and when we compared it, with the experimental results, it can be observed, that the experimental results, were located in between the parallel direction values and random direction values for SWCNTs, with respect to heat flux direction. Ablation simulation results values coming higher than experimental results values, this could be explained, as the interface affect of nanocomposites, which had high strength and strong bond force.


Article
Analytical Calculation of Heat Conduction in Two-Phase Heterogeneous Materials

Authors: M.A. Salman --- S.G. Zhirov --- A.A. Koptelov
Pages: 11-15
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Abstract

The method of the calculation of the heat conduction of the two-phase heterogeneous materials, where the filler’s participles of the cubic form by the at random fashion distributed in the matrix’s volume is considered. The given method of the effective heat conduction of the heterogeneous materials is based on the probability principles of the analysis of their structure. Such approach allows not only predict the average magnitudes of the heat conduction of the binary or many-component compositions but also to determine the bounds where their measured valuations will be realized with the given of the degree of certainty. The received formulas are applied in a wide range volume correlation changes and heat conduction of the separated components and also typical sizes of the researched samples.


Article
Novel Optical Fiber Sensor Based on SGMS Fiber Structure for Measuring Refractive Index of Liquids and Gases

Authors: J.K. Hmood
Pages: 17-21
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Abstract

In this paper a single mode-gap-multimode-single mode fiber structure (SGMS) as refractive index sensor is demonstrated. A beam propagation method (BPM) for the circular symmetry waveguide is employed for numerical simulations of the light propagation performance in such fiber devices. The multimode interference effect is revealed to design optical fiber sensor with reasonable linearity in wide range of refractive indices. A simple way to predict and analyze the spectral response of the SGMS structure is presented with the derived approximated formulations. The proposed sensor is realized by using standard optical fibers. Results indicate that the proposed SGMS structure can be exploited for measuring a broad refractive index range with reasonable high resolution. The results achieved for refractive indices in the range of 1.1 to 1.43 have best linearity with correlation coefficient 0.9991 at wavelength of 1550 nm. Therefore, it can be suggested that the SGMS structure fibers are attractive for measuring refractive index of both gases and aqueous solutions such as chemical liquids, biological, and biochemical sensing.


Article
Design and Simulation of Q-Switching and Mode-Locking Nonlinear Mirror for Frequency-Doubled DPSS Nd:YAG Laser Output

Authors: A.A. Alsharify
Pages: 23-27
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Abstract

In this work, multilayer reflection coating analysis has been employed for designing and simulating nonlinear mirror to be used for Q-switching and mode-locking of frequency-doubled DPSS Nd:YAG laser using composite crystal (DPM010X). It was found that the optical reflection greatly depends on the type of the nonlinear crystal and dichroic material used, the type of the refractive index (ordinary or extra-ordinary), direction of propagation inside the nonlinear material, optical thickness and the number of anti-reflection coating layer used. The calculated refracted index was found to be 2.232 for the 1064nm wavelength for LINBO3 crystal and 1.655 for 1064nm for the BBO crystal. The results show that the reflectivity reaches the best value when the refractive index difference between the anti-reflection coating layers is small, and increasing the number of such layer. The calculated phase-match angle is equal to 13.75177°.


Article
Light-Beam-Induced-Current Analysis of Thin-Film Polycrystalline Solar Cells

Authors: G.A. Elsayed --- R.M. Basyouni
Pages: 29-32
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Abstract

Light-beam-induced-current (LBIC) measurements are providing a direct link between the spatial non-uniformities inherent in thin-film polycrystalline solar cells, such as CdTe and CIGS, and the overall performance of these cells. LBIC is uniquely equipped to produce quantitative maps of local quantum efficiency with relative ease. Spatial resolution of 1 m at 1-sun intensity, and return to the same area after other measurements, is routinely achieved. A wavelength range of 638nm to 857nm is available with diode lasers. The LBIC measurements demonstrate that several types of effects that alter cell performance can be traced to specific local-area features. Examples of such effects include defects related to edges, grids, or scribes, spatial variations in alloying, and local changes due to high-temperature stress.


Article
Development of NVD's Using XR5TM IIT Technique and III-V Photocathode Under Night Sky Conditions

Authors: Q.A. Alnasar
Pages: 33-36
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Abstract

Image intensifier system (IIS) or night vision devices (NVD) are the imaging systems built up by using an image intensifier tube consisting of a photocathode, an anode in form of a phosphorous screen, and other optional components. Spectral sensitivity of the IIS depends on design but generally IIS used for external surveillance conditions are sensitive to radiation from (400 to 800) nm and sometimes up to 900nm. In this work the technical specifications of XR5TM image intensifier is used under different night sky conditions to evaluate the distance of vision for the NVD. Photocathodes have been developed using III-V materials with different concentrations; such materials have very high sensitivity in the near-infrared spectral region. The longest distance vision of (2120, 656) m can be obtained at full moon of 0.1 lux.

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