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It is my great pleasure and delightful duty to express my sincere thanks, gratitude and appreciation to my supervisor Prof. Alaa Sheta fer his support, patience and help. I have know Pref. Alas during the last two years as a determined and principle centered person. His overly enthusiasm and integral view on research and his mission for providing only high—quality work and not less, has made a deep impression on me. I owe him lots of gratitude to get this work done. He could not even realize how much I have learned from him.