1. Woodruff School of Mechanical Engineering; Georgia Institute of Technology; Atlanta GA USA 30332
2. Institut fur Kunststoffverarbeitung; RWTH Aachen; Pontstraße 49 52062 Aachen Germany
3. Institut fur Experimentalphysik II; Ruhr-Universitat Bochum; Universitatsstraße 150; 44801 Bochum Germany