1. Sustainable Process TechnologyUniversity of Twente Drienerlolaan 5 Enschede 7522 NB The Netherlands
2. Department of Mechanics of Solids, Surfaces and Systems (MS3)University of Twente P.O. box 217 7500 AE Enschede The Netherlands
3. Shell Projects and Technology Grasweg 31 1031 HW Amsterdam The Netherlands