\chapter*{Acknowledgments}

I would like to give special thanks to Prof. Dr.-Ing. Michael Protogerakis for his attentive supervision of my Master Project and this thesis.

Mr. N. Stuhrmann and Mr. M. Meilchen too have my gratitude for their tireless assistance in the laboratory.

Thank you to Prof. Dr.-Ing. Ralf Beck for offering to be the second examiner of this thesis.

Finally I would like to thank XX for their proofreading of this work, and my partner I. Gvazdaityte whose everlasting support at home made this work possible.