VitaProf. Dr.-Ing. H. Siegfried StiehlRetired Head of Research Group (Senior Professor until September 30, 2021)Vogt-Kölln-Straße 3022527 Hamburg, GermanyEmail: hans-siegfried.stiehl"AT"uni-hamburg.deNameTelE-MailStiehl, H. Siegfried, Prof. Dr.-Ing.hans-siegfried.stiehl"AT"uni-hamburg.de