1. University
of Southern Denmark, Institute of Chemical Engineering, Biotechnology and
Environmental Technology, Niels Bohrs Allé 1, DK-5230 Odense
M, Denmark
2. Dipartimento
di Ingegneria Meccanica,
Chimica e dei Materiali, Universitá degli Studi di Cagliari, Via Marengo 2, 09123 Cagliari, Italy