Abstract:for their precious time and assistance. My special thanks go to Dr. Kay M. Brummond for her constant encouragement and help. I would also like to thank many people for their friendship and assistance during the years here while it is hard to name every individual. My very special appreciation goes to my wife Annie (Shangshi) for her love, constant support, and encouragement during all these years and our daughter Lana for her love, cooporation and understanding. I would like to thank my parents for their patie… Show more
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