Dedication To The Queen of my life: my mother Fawzia Fadl-allah Dear father Albagir Aljaily Brothers: Moied, Razan Family, Friends By the grace of Allah then your believe on me I progress on my study, complete my Master thesis Thanks a lot Acknowledgement I would like to express my appreciation and respect to Dr-Ahmed Elhasan Elfaki. He strives to help me succeed. My humble thanks are due to all the staff in a Sudanese Standard and Metrology Organization (SSMO); from them I saw unlimited patience, unsparing guidance, and unfailing trust.