Construction and Operating CO2 Laser System with Heat Distribution Technique
Construction and Operating CO2 Laser System with Heat Distribution Technique
Volume 25, Issue 6 , August 2007, Page 247-255

https://doi.org/10.30684/etj.25.6.1

Abstract
  In this work ، a CW CO2 laser system was constructed and operated. This system employs an intermediate heat sink unit in order to increase cooling rate of the active medium, which ...  Read More ...
Synthesis Of Nucleosides Analogues Substituted With Oxy Amino Acetylenic Derivatives
Synthesis Of Nucleosides Analogues Substituted With Oxy Amino Acetylenic Derivatives

M. AL-Zahawyi Hala

Volume 25, Issue 6 , August 2007, Page 702-710

https://doi.org/10.30684/etj.25.6.2

Abstract
  This work describes the synthesis of 5-(5'-(4-disubstituted amino-butyn-2-yl)oxy-b-D-ribofuranose) uracil.For the synthesis of these compounds, 5-(b-D-ribofuranose) uracil wasconverted ...  Read More ...
Study on Improvement of Casting Conditions for Some Aluminum Bronze Alloys
Study on Improvement of Casting Conditions for Some Aluminum Bronze Alloys

A. Ajeel Sami; N. Ibrahiem Ahmed

Volume 25, Issue 6 , August 2007, Page 711-727

https://doi.org/10.30684/etj.25.6.3

Abstract
  Two types of aluminium bronze alloys have been studied to determine theproper methods of melting and casting in two different conditions; with treatingmaterials as (Albral 2, Logas ...  Read More ...
Numerical Simulation Of Two Dimensional Transient Natural Convection Heat Transfer From Isothermal Horizontal Cylindrical Annuli
Numerical Simulation Of Two Dimensional Transient Natural Convection Heat Transfer From Isothermal Horizontal Cylindrical Annuli

K. Hassan Ayad; M. A. Al-lateef Jasim

Volume 25, Issue 6 , August 2007, Page 728-745

https://doi.org/10.30684/etj.25.6.4

Abstract
  Numerical solutions are presented for the transient natural convection heattransfer problem in horizontal isothermal cylindrical annuli, enclosed in heatedinner and cooled outer cylinders. ...  Read More ...
Effect of Airplane Tail Aspect Ratio on Lateral- Directional Stability
Effect of Airplane Tail Aspect Ratio on Lateral- Directional Stability

A.R. Yass Mohammed

Volume 25, Issue 6 , August 2007, Page 746-756

https://doi.org/10.30684/etj.25.6.5

Abstract
  For lateral-directional stability analysis, the horizontal tail geometricparameters effect has not been considered. In the present work, the effect ofhorizontal tail aspect ratio on ...  Read More ...
Mathematical Modeling Of Multi Component Batch Extractive Distillation
Mathematical Modeling Of Multi Component Batch Extractive Distillation

M. Shakoor Zaidoon; A. Al-Naimi Safa

Volume 25, Issue 6 , August 2007, Page 757-774

https://doi.org/10.30684/etj.25.6.6

Abstract
  A dynamic model has been developed to study the dynamic behavior of multicomponent batch extractive distillation column. The set of equationsgoverning (material bvalance, heat balance, ...  Read More ...
Comparative Study Between Newtonian And Non Newtonian Lubricants In Journal Bearing Using Variable Viscosity
Comparative Study Between Newtonian And Non Newtonian Lubricants In Journal Bearing Using Variable Viscosity

Ali Muhsin Ibrahem; A. Al–Ameer Ali

Volume 25, Issue 6 , August 2007, Page 775-796

https://doi.org/10.30684/etj.25.6.7

Abstract
  The focus of this investigation is to study the effect of lubricant viscosityvariation on the performance of the finite width plain journal bearing withNewtonian and non–Newtonian ...  Read More ...
Study on Temperature and Etching Effects on Silicon Oxide Formation Using Laser Ellipsometric Method
Study on Temperature and Etching Effects on Silicon Oxide Formation Using Laser Ellipsometric Method

Z. Yahiya Khalid; . Al-Baldawi AmmarM; H. Jraiz Ammar

Volume 25, Issue 6 , August 2007, Page 797-807

https://doi.org/10.30684/etj.25.6.8

Abstract
  In this paper, a laser ellipsometric method is implemented to study theformation of oxide films on silicon substrate at room temperature in air. Twolasers, He-Ne and semiconductor diode, ...  Read More ...
Phase Transformations of Hadfield Manganese Steels
Phase Transformations of Hadfield Manganese Steels

D. Subhi Akeel; A. Abdulrazaq Omar

Volume 25, Issue 6 , August 2007, Page 808-814

https://doi.org/10.30684/etj.25.6.9

Abstract
  In the present work, the effect of different silicon percentages that wereadded to Hadfield manganese steel on the microstructure, phases and hardnessare investigated. The results show ...  Read More ...
Studying Critical Flash Over of Different Types of High Voltage Insulator
Studying Critical Flash Over of Different Types of High Voltage Insulator

A. Ajeel Sami; T. Younis Mokdad

Volume 25, Issue 6 , August 2007, Page 815-827

https://doi.org/10.30684/etj.25.6.10

Abstract
  The critical flashover CFO of an insulation structure is commonly used todescribe the insulation structure lightening impulse strength. In this work,first CFO of polymer and porcelain ...  Read More ...