Denne afhandling era f De Ingeniør-,Natur- og Sundhedsvidenskabelige Fakulteter ved Aalborg Universtet antaget til forsvar for doktorgraden I Teknik. Farsvaret finder sted i Auditoriet, Aal borg Universitet Esbjerg fredag den 12. Juni 2009 kl. 13..præcis Aalborg den 6. Maj 2009 Frede Blaabjerg Dekan This thesis has been accepted by the Faculties of Engineering, Science and Medicine at Aalborg University for public defense in fulfillment of the requirements for the doctoral degree in technology. The defense will take place in lecture room at Esbjerg Institute of Technology on Friday, June 12, 2009 at 1.00 p.m., punctually. Aalborg, May 6, 2009 Frede Blaabjerg Dean