Grewal for enabling me to write my diploma thesis at the facilities of CSIRO Australia, Department of Applied Physics, Division of Manufacturing Technology. I gratefully acknowledge the continuous support from Dr. Leonard Farmer for his help in word and deed. I would also thank Ingo Westphal, who formed the base for this thesis; Curtis, who persistenly searched for every peace of literature I needed; Brenda Gale, for her advice and administrative aid; Cong, who supplied me with hardware and software; Mark, who helped me solving some mechanical problems; Narelle, who carefully read the thesis and corrected some of the countless English flaws; the entire team of CSIRO's Division of Manufacturing, who helped me wherever it could. They all deserve my grateful thanks and made my stay in Australia an experience that I wil
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