Journal of Kerbala University

1

علي عبد العباس البكري

Pages: 101-111 English

Densities (ρ) and viscosities (η) of urea in Ammonium phosphate solution at different temperature (298.15, 303.15and308.15) K have been measured. The results were used to determine the apparent molar volumes (∅v) and limiting partial molar volumes (∅v°), slop (Sν), Gibbs energy of activation for viscous flow of solution ∆G∗1, 2 and Jones – Doles B coefficients. The results show that solvated Urea shows different types of solute – solute interactions as a result of its dissociation spatially at low concentrations. The results also show that the solvated urea has the property of breaking structure of liquid ammonium phosphate solution with increasing temperature.

Abstract

تضمنت هذه الدراسة قياس كثافة ولزوجة اليوريا مع فوسفات الأمونيوم في المحلول المائي بدرجات حرارية مختلفة ((298.15,303.15and 308.15مطلقة. استخدمت هذه النتائج لحساب الحجم المولالي الظاهري ϕν ، الحجم المولالي الظاهري المحددϕν°،الميل Sν، طاقة كبس للانسياب اللزج للمحلول ∆G∗1,2 ومعامل جونس دول –B .حيث بينت النتائج إن اليوريا تظهر أنواع مختلفة من تداخلات مذاب – مذاب كنتيجة لتفككها عند التراكيز الواطئة، كذلك فان اليوريا تسلك كعامل مهدم لتركيب محلول فوسفات الامونيوم السائل مع زيادة درجة الحرارة .

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Optical characteristics of ZnO:Al thin films prepared by magnetron sputtering

Najiba Abdulla Hassan, Mustafa Shakir Hashim, Reem Saadi Khaleel

Pages: 224-230 English

Methak. S. Mohammad

Pages: 276-281 English

In this paper ,the proposed system was presented and it divided into two parts . First one is the designer or ( Administrator ) part who can control on all options of the system in managing and updating all information included in the data base of the system .The second is the user part who can navigate in all environments of the system to give the required knowledge. Very important subject was selected to include it in the secure e-learning system which is (wireless networks) because it is very important topic in the computer and communication world . The capabilities of the system are (add , delete, update, search) for data base of the system . The security was supported in the system by using the password technique. The system includes audio (music) effect to make the user more relax when he browses the pages.The system was designed by using Apache server , PHP, HTML, Web Page Maker , and MYSQL for data base .

Abstract

في هذا البحث فأن النظام المقترح قد قسم الى قسمين : الأول هو جزء المصمم أو( المدير) وهذا بدوره يستطيع السيطرة والتحكم في جميع خيارات وامكانيات النظام في ادارة وتحديث جميع المعلومات الموجودة في قاعدة بيانات النظام. أما الجزء الثاني فهو جزء المستخدم الذي يمكّن المستخدم الراغب في التعلم من التنقل في جميع بيئات النظام لإكتساب المعرفة اللازمة. لقد تم اختيار موضوع مهم جداً في هذا النظام لتعليمه وهو موضوع الشبكات اللاسلكية في مجال الحاسبات والاتصالات . يتضمن النظام امكانيات عديدة وهي ( الاضافة ، الحذف ، التحديث ، وخدمة البحث) في قاعدة بيانات النظام. دعم النظام بأمنية عالية باستخدام تقنية كلمة السر. أضيفت للنظام تأثيرات صوتية موسيقية لجعل المستخدم أكثر راحة خلال عملية الاستراض في النظام. صمم النظام باستخدام Apache server, PHP, HTML, Web Page Maker و MySQLلبناء قاعدة البيانات.

29

A Decision – Theoretic Bayesian Approach For Selecting the Best of Gamma Populations With General Loss Function

Samira Faisal Hathot

Pages: 318-325 English

Full Text Issues

30

Effect of Different Polymerization curing times and Water Temperatures on Transverse Strength of Self-Cure Acrylic Resin Material

ليلى موسى عودة النداوي

Pages: 326-332 English

Full Text Issues

Abstract

The self-cured acrylic resin is inferior to heat cured acrylic resin from stand point of strength and degree of polymerization. Many attempts have been made to improve these properties.
Because heat affects maturity of the chemical reaction of acrylic resin therefore its maintenance during polymerization will affect the mechanical properties of cured resin. This study was carried out to evaluate the effect of different curing time and heat application during polymerization of the self-cured acrylic resin on transverse strength compared with that polymerized in air at 23C ± 5C.
Nineteen (90) Self-cured acrylic resin specimens were prepared and divided as follow:- (10) specimens polymerized in air at 23C  5C under press (bench curing) as a control group. (40) specimens polymerized in water at 20C, 40C, 60C, and 80C, under (30 psi) pressure for 15 minutes . (40) specimens polymerized in water at 20C, 40C, 60C, and 80C, under (30 psi) pressure for 30 minutes. All specimens were tested for transverse strength.
Results showed that self-cured acrylic resin specimens polymerized in 15 minutes has a significant lower transverse strength than polymerized in 30 minutes. The transverse strength of the test specimens polymerized in water at 20C lower than control group, while all degree of polymerization improved transverse strength, however, in 80C highest transverse strength compared with the other temperatures control group.
It can be concluded that increasing curing time and water temperature during polymerization will improve transverse strength of self-cured acrylic resin.

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Fuzzy Neural Design of Power Systems Stabilizers

Ibrahim F Jasim

Pages: 333-345 English

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