1. Faculty of Engineering; Univ. of Southern Denmark; Niels Bohrs Alle 1 5230 Odense Denmark
2. AgroTech A/S, Institute for Agro Technology and Food Innovation; Udkaersvej 15 DK-8200 Aarhus N Denmark
3. Dep. of Agricultural Engineering, Research Centre Bygholm, Faculty of Agricultural Sciences; Univ. of Aarhus; Schüttesvej 17 DK-8700 Horsens Denmark