This report summarizes research activities carried out in compliance with the extension period of the research project proposed to and funded by the A. Von Humboldt Stiftung. Outline of the activities is reported in the work plan for the fourth period of exchange of the fellowship (extension) of the first author, at the beginning of the present report. Reference is made to previous reports describing activities of former
periods. Thereafter, activities are outlined as they were carried out during the stay in Hamburg of the first author. Similarly to previous reports, this report is co-authored by Dipl.-Ing. Claas Fischer, actually Doktorand at TUHH and working on similar topics, as the reported research activities were carried out in strict cooperation.