I would like to express this appreciation to Professor Branimir Grgur, for his supervision, guidance, encouragements, and advice throughout the duration of study and experimental work. I would also to thanks sincere appreciation to my Mentor Professor Branimir Grgur, Professor Milica Gvozdenović and Dr. Branimir Jugović, for guideless during the work on this doctoral dissertation. Finally deep thanks to the Libyan Government, and my family, for their patent, and encouragements during my Ph.D study at Belgrade University. Thank you.