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Article
Calculation of the Buildup Factors for Ceramic Materials

Author: S.I. Jubair
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 1 Pages: 23-26
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Iraqi Siliceous rocks were chosen to be used as raw materials in this study which concern with bending strength and their related parameters. They are porcelinite from Safra area (western desert) and Kaolin Duakla, their powders were mixed in certain percentage, to shape compacts and sintered. The study followed with thermal and chemical treatments, which are calcination and acid washing. The effects on final compact properties such as bending strength were studied. Bending strength was calculated for sintered compacts to study the effects of calcination processes, chemical washing, weight percentage, sintering processes, loading moment were studied on this property. Where the compacts for groups are insulating materials and have good thermal conductivity by previous studies. The results indicate that some of these groups satisfy ability the required bending strength property for electrical insulator, thermal conductivity property is required to complete final stage to be used in industry.


Article
Design and Construction of a Testing Platform and Estimating Attenuation Painting Reflectivity to Laser Beam
تصميم وبناء منصة أختبار وتقييم أنعكاسية صبغات توهين أشعة الليزر

Authors: Qahtan. G. Hial قحطان كاطع حيال --- Nahida B. Hasan ناهـدة بخيت حسن --- Mohammed K. Khalaf محمد خماس خلف
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2011 Volume: 8 Issue: 2 Pages: 333-338
Publisher: Baghdad University جامعة بغداد

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Abstract

The project has been described the design and construction of a reliable optical testing platform used for evaluate the reflectivity of metal surfaces treated with special paintings required for laser beam attenuation. The platform comprises an Nd-YAG laser system which has been designed and fabricated with specifications to be compatible with their corresponding in laser range finder transmitters used for various applications. The reflectivity of various attenuating paintings, at different detection angles, has been observed. Moreover, the variation of the reflected energy with painting type and metal type to be painted has been studied experimentally. Results illustrated the existence of a definite angle, at which the reflectivity was maximum (specular reflection). On the other hand, samples with attenuation paintings have constant very low diffusive reflectivity and are independent of the detection angle.

يصف البحـــث تصميم وبناء منصة فحص بصرية معول عليها في تقييم ألانعكاسية للسطوح المطلية بصبغات خاصة مستخدمة لتوهيــن اشعة الليزر. تتضمن المنصة منظومة ليزر النيديميوم – ياگ المصممة خصيصاُ بمواصفات متوافقة مع مثيلاتها المستخدمة في مرسلات مقدرات المدى الليزريـــة.تمت ملاحظة الانعكاسية لصبغات توهين متنوعة وبزوايا كشف مختلفة. علاوة على ذلك، تم تجريبياً دراسة تغير الطاقة المنعكسة مع نوع الصبغة والمعدن المراد طلائه. أظهرت النتائج وجود زاوية محددة تكون عندها الانعكاسية أعظم مايمكن (أنعكاس مرآوي). من ناحية أخرى، العينات المطلية بصبغات التوهين تمتلك انعكاسية انتشارية متساوية،صغيرة جداً وبغض النظر عن زاوية الكشف.

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