Purdue University Fuel Research (IMAGE) Purdue University Caption Discrete element method (DEM) computer models have been developed for describing biomass transport through a compression feed screw. This image shows mathematical simulation of biomass particles in feed screw at steady state. Credit Purdue University/Michael Ladisch Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.