الفهرس 
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Abstract
After passing through the fruitful journey of my thesis and accomplishing my work, I would like to primarily thank God for leading me to the path of knowledge. I also wish to express my gratitude to several people who have provided me with great support and advice. Without the support, I gained from my professors, colleagues, and family I would not have been able to reach this current stage of success. Their continuous patience, understanding, and care were the recipes for my accomplishments.
I would like to express my deepest gratitude to my supervisor Prof. Dr. Hamdy Sadik Ahmed for his continuous support, encouragement, helping me to whom I could not reach with my own efforts and understanding throughout this long and challenging journey. Also, I would like to express my gratitude to Dr. Fatma Mostafa Elnekhaily for helping me through the thesis process, valuable advice, constant effort, and continuous encouragement throughout the whole research. Words aren’t enough to thank them for their great support and limitless help. I am grateful to them for their collaboration on this thesis process. In addition to my advisors, I would like to thank the rest of my thesis committee: Prof. Dr. Hossam El din El Borombaly and Prof. Dr. Mohamed Alaa Mandour for their encouragement and insightful comments.
My family and friends, you are one of the pillars of my life. I would like to express my gratitude to my father Architect Kamal Hamed, my mother, and my sisters for their endless love and support, which they always make me feel. Thank you to my husband for his precious advice, endless support, and his encouragement during the years of study. Most importantly, I would like to thank my daughter for her sole presence and pure love which is my source of happiness. Above all, I am grateful to all my family members and friends for being always there for me.