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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: 2008 volume:4 issue:4

Article
Determination of Thermal Conductivity of Compact Graphite Iron

Authors: S.F. Alsaffar --- K.I. Khalaf --- A.N. Abo Raghif
Pages: 3-6
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Abstract

It is presented an experimental study about thermal conductivity in gray iron and compacted graphite iron. Thermal conductivity of the specimen is measured by a comparative method with stationary axial heat flow according to ASTM E 1225. The investigated specimen is put in a stack in tight thermal contact with two reference materials of same diameter. The upper reference specimen is coupled to a heat source, the lower reference to a heat sink. A guard heater and other experimental setup minimize radial heat losses. Reference material is electrolytic iron with certified thermal conductivity. It was tested 2 gray irons, the first alloyed with CuSnCr and the second with CuSnCrMo. Two grades of compacted graphite iron were also tested, CGI 350 and CGI 450. The tests were conducted up to 400°C.


Article
Effects of Deposition Parameters on Chemically Deposited PbS Thin Films

Authors: A.M. Mousa --- S.B. Ali
Pages: 7-11
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Abstract

Lead sulfide thin films were deposited by chemical bath deposition onto glass substrates. Depending on the percentage of the constituent bath salts and bath temperature, films with polycrystalline or amorphous structure were obtained. The influence of bath temperature and bath percentage on optical transmittance in the NIR region and structure was investigated. It was found that thickness goes on decreasing as the concentration of lead acetate increases. XRD revealed that the film deposited at 20°C displays no obvious characteristic reflection peaks which could be detected. Large grains are obtained when both deposition time and temperature are increased.


Article
Performance Comparison of InP-Based Phototransistors to PIN and UTC Photodiodes

Authors: C. Gonzalez
Pages: 13-17
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Abstract

The main characteristics of vertically illuminated InP/InGaAs-based heterojunction bipolar phototransistors (photo-HBT) developed at OPTO+ (Alcatel) were presented. Also, the design and fabrication of photo-HBT-based monolithically integrated circuits such as optoelectronic amplifier and mixers are described. Comparisons of some performances between photo-HBTs, PIN and UTC photodiodes are commented.


Article
Optical Properties of Silicon Nanoparticles Produced by Nd:YAG Laser Ablation

Authors: B.G. Rasheed --- M.A. Ibrahem
Pages: 19-23
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Abstract

Silicon nanoparticles films have been fabricated by laser ablation process using pulsed Nd:YAG laser. Various laser parameters were examined to produce films of different properties such as the laser energy, laser fluence, and the target-substrate distance. The experimental results have been fitted with the theoretical quantum confinement model to analyze the photoluminescence spectra and estimate the nanoparticle sizes and their distribution. From the optical transmission studies, we found that the band gap of the prepared nanostructured films was in the range (1.5-2.4)eV due to the existence of various nanoparticle sizes in the deposited film. Furthermore, the photoluminescence PL spectra indicate that the estimated band gap lies between (1.6-2.4)eV. While, the corresponding nanoparticle sizes contributing the PL emission were in the range (22-38)Å.


Article
Fractal Nanotechnology (Invited Paper)

Authors: G. Ceroflini --- D. Narduci --- P. Amato --- E. Romano
Pages: 25-29
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Abstract

Self-similar patterns are frequently observed in Nature. Their reproduction is possible on a length scale 102–105 nm with lithographic methods, but seems impossible on the nanometer length scale. It is shown that this goal may be achieved via a multiplicative variant of the multi-spacer patterning technology, in this way permitting the controlled preparation of fractal surfaces.


Article
Preparation and Characterization of Self-Assembled n-ZnS Thin Films

Authors: C. Mehta --- J.M. Abbas --- G.S.S. Saini --- S.K. Tripathi
Pages: 31-34
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Abstract

We have synthesized ZnS nano-crystalline (n-ZnS) powder using zinc acetate and thiourea from chemical route at different pH. The average crystal size is determined as 3-5 nm with the help of X-ray diffraction. The formation of ZnS has been confirmed with the help of infrared (IR) spectroscopy by observing bands corresponding to the multi phonon absorption. IR spectrum also confirms presence of the capping agent on ZnS. Thin films of ZnS have also been deposited on glass and quartz substrates from the solution using self-aggregation approach. Refractive index (n) of the films is also determined. The optical band gap is calculated from the Tauc’s extrapolation and is found to be dependent on pH of the bath solution. Electrical conductivity measurements have been done on these thin films and the activation energy has been calculated.


Article
(3-5) μm and (8-12) μm Wavelengths Ultra-Short Tunable Laser Pulses Using Optical Parametric Oscillation Technique

Authors: A.A. Al- Dergazly --- F.F. Rasheed --- S.M. Jumaa
Pages: 35-39
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Abstract

A computational investigation has been carried out on optical parametric oscillation (OPO) technique. Non-collinear phase matching between the pumping wave and the two generated signal and idler waves has been taken into consideration. In order to separate the two generated waves a design has been put forward for a resonator for each wave within the same cavity and interrelated by mirror that transmits the pumped laser beam. The cavity configuration takes into account the three types of phase matching between the three waves. Solid state lasers were considered for pumping the nonlinear crystal. Furthermore, attention has been paid on the solid state Er:YAG laser for pumping the positive uniaxial AgGaSe2 crystal to generate a signal wave of (8-12)μm wavelength so the generated idler wave from 3.82 to 4.55μm wavelength.

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