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This Thesis was defended successfully on 2 / 2 / 2011 and approved by Defense Committee Members Signature 1. Dr .Hatem Atalla (Supervisor) 2. Prof. Dr. Jamal Abo Omar (Internal Examiner) 3. Dr. Iyad Badran (External Examiner) III Dedication To my mothers, father, sisters and brothers. To my wife and my family I dedicate this project IVdoi:10.14196/sjva.v7i5.2528 fatcat:2agntxkd4fgd7l4xto5vie2ouq