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First and above all, I praise our God" Allah", the almighty for providing me with this opportunity and granting me the capability to proceed successfully. This thesis appears in its current form due to the assistance and guidance of several people. I would therefore like to offer my sincere thanks to all of them.

I would like to thank my academic advisor Prof. Mohammad Al-Ibrahim for granting me the knowledge and advice without which this work wouldn’t have seen light. I also would like to thank the thesis discussion committee represented by Dr. Jehad Ababneh and Dr. Bassam Harb for their active participation in the review of the thesis, and their constructive comments and suggestions.