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Iraqi Journal of Applied Physics Letters

الرسائل العراقية في الفيزياء التطبيقية

ISSN: 1999656X
Publisher: iraqi society for alternative and renewable energy sources and techniques
Faculty:
Language: English

This journal is Open Access

About

Iraqi Journal of Applied Physics (IJAPLett) is a scientific periodical sponsored and
published by the Iraqi Society for Alternative and Renewable Energy Sources and
Techniques (I.S.A.R.E.S.T.). The Editorial Board is responsible for the scientific content
and other editorial matters relating to the Journal. Manuscripts submitted are first screened
by the editors; those on subject matters within the scope of the IJAPLett are sent to an
expert referee for evaluation and may be sent to a second reviewer if necessary. This
screening process helps to assure an appropriate focus as well as high scientific quality of
the Journal. The IJAPLett welcomes submission of papers and letters in applied physics
and related fields of science, engineering and technology. They should have something in
common with what we now publish on inanimate materials and processes therein:
structures, transport, physical, electrical, dielectric, magnetic, and optical properties. Our
basic criterion stated below will continue to apply: papers must contain science, especially
physics, and there must be an application. We advise authors submitting papers to suggest
the names of at least two possible reviewers, with full information on addresses, phone and
e-mail. Suggestions of reviewers are welcome regardless of the subject.

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Contact info

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

Table of content: 2008 volume:1 issue:1

Article
Characterization of D.C. Sputtering System

Authors: A.S. Jabbar --- A.J. Haider --- A.M. Mousa
Pages: 3-9
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Abstract

DC sputtering system was designed and fabricated and it used for deposition cadmium films. The optimum conditions for deposition was determined experimentally under different voltages, pressures, and inter - electrode distances. XRD spectra show a clear indication of (hcp) peaks which belongs to pure cadmium metal.


Article
Modeling of the Preheating Effect on Keyhole Laser Welding Efficiency

Authors: K.S. Khashan --- O.A. Hamadi
Pages: 10-15
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Abstract

In this work, results of a mathematical analysis of the role of workpiece preheating in laser keyhole welding were presented. This analysis considered the steady-state welding as well as certain range of boundary conditions over which preheating effect would be indicated. This work is an attempt to interpret the role of preheating to increase welding depth and perform keyhole welding with high quality using physical and thermal properties of steel alloys.


Article
Effects of CaO–B2O3 Glass on Sintering and Microwave Properties of Cordierite Ceramics for Low-Temperature Cofired

Authors: A.M. Jasim --- H.J. Hameed
Pages: 16-20
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Abstract

The densification behavior and dielectric properties of cordierite ceramics adding three different proportions of CaO–B2O3 glass were investigated. The cordierite ceramics were prepared from the waste of porous ceramics. Their crystalline phases, densification parameters, dielectric properties, and microstructure were addressed. The densities of all samples firstly increased and then decreased. The crystalline phase of samples was cordierite. It was considered that CaO–B2O3 glass and cordierite ceramic did not react in the process of sintering. With 10, 15, 20 wt% CaO–B2O3 glass added, the maximal densities of samples were 2.46, 2.42, and 2.33 g/cm3, respectively, obtained at 1060, 1000, and 940°C. The materials had a low dielectric constant and a low dielectric loss [~5, tan ~(2-3) x10-3, at about 10GHz]. The sample, with 15wt% CaO–B2O3 glass added, sintered at 1020°C (binder burning temperature at 500°C, with a heating rate of 3°C/min) had better properties (~5.14, tan=2.23x10-3 at 10.328 GHz).


Article
Computation of Optical Energy Gap of Cu2O Thin Film: Theoretical Estimation

Authors: N.F. Habubi --- K.A. Mishjil --- H.G. Rashid --- B.G. Rasheed
Pages: 21-23
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Abstract

Thin films of cuprous oxide Cu2O have been prepared using spray pyrolsis technique. Experimentally, the optical energy gap of Cu2O was about 2.2eV. To achieve and estimate an accurate Eg value, there was problem in the selection of exact tangent point. To overcome this problem, Newton-Raphson method and mean-value theorem were used. It was found that the mean-value theorem can predict correlated nearly satisfactory Eg value than the other method.


Article
Underwater Sensing Characteristics of a ZnO Thin Film Sensor Prepared by Spray Pyrolysis

Authors: A.J. Mohammad
Pages: 24-27
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Abstract

In this work, ZnO thin films were prepared by spray pyrolysis technique to fabricate underwater sensors. Results explained that the preparation conditions affect the sensing characteristics and the attenuation in the underwater environment is dependent of distance from sensing signal source and its frequency. The prepared sensor was tested in a water environment containing crude oil and it exhibited reasonable results to sense the oil amount.


Article
Study on Compensation of Thermal Stresses in the Fabrication Process of Thin-Film Transistor

Authors: A.A. Khalaf --- M.O. Ghafil --- S.M. Alrawi
Pages: 28-30
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Abstract

It is essential to align masks without tolerance in every deposition step when fabricating thin-film transistors (TFTs) on a polymer substrate. However, the shrinkage of the polymer substrate due to thermal effect may arise during the deposition process. We observed the variation of shrinkage as a function of the annealing temperature. It was found that the substrates keep shrinking up to a critical temperature and stay the same above that point. The thermal treatment was conducted on substrates polycarbonate (PC), the polyarylate (PAR), and poly(ether sulfone) (PES). After predeposition annealing, the shrinkage was prevented but deformation was observed on the surface. An inorganic thin film with a different thermal expansion coefficient was employed to remove the deformation and this resulted in the elimination of strain.

Keywords

Thin film --- Shrinkage --- Deformation --- Misalign --- Annealing


Article
Characterization of Quantum Well Diode Pumped Nd:YVO4 Using V-Shape Technique

Authors: A.J. Haider --- H.M. Hikmet
Pages: 31-34
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Abstract

V-shape face pumping scheme was used, a comparison between the bulk and the QW laser was made when used as pumping sources in CW mode to a Nd:YVO4 disk crystal, the output power obtained for the bulk diode laser was 29mW, and when using the QW diode laser the maximum output power obtained was 58mW. In pulsed mode when using internally triggered bulk diode laser with prf=1.3kHz, the maximum emitted peak power was found to be 40mW, with a resonator length L=13cm, while for external triggering with prf=3Hz, the maximum output peak power was found to be 145mW.

Table of content: volume:1 issue:1