Andreas Linderholt, Mechanical Engineering, Linnaeus University, Växjö, Sweden. Matthew S. Allen, University of Wisconsin–Madison, Madison, USA. Randall L. Mayes, Bldg 860 Room 201D, MS 0557, Sandia National Laboratory, Albuquerque, USA. Daniel Rixen, Lehrstuhl für Angewandte Mechanik, Technische Universitat Munchen, Garching, Germany.