الفهرس 
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Abstract
All gratitude is due to God Almighty who guided am
aided me to bring-forth to light this thesis.
My cordial gratitudes are dedicated to Prof. Dr. A.I.
Abdel I’at^ah for suggesting the point of research as we.1 I. as his valuable guidance, constant encouragement, and con¬structive advice during the implementation of this work.
t 1 wish also to express my sincere thanks to Dr. N.M.
r
j Farrag for his kind help.
•• •: V;
I would like to express my deep thanks to the staff of Elec. Eng. Dept. for their interest and for freely offered facilities.
It is pleasure to express nay great thanks to Eng. Adel Abdalla Tawfek for his unfailing help.
Thanks are/also to the staff and technicians of the
Elec. Eng. Laboratory.