Direct mechanical energy measures of hammer mill comminution of switchgrass,wheat straw,and corn stover and analysis of their particle size distributions
1. Centre of Research for Energy Resources and Consumptions, University of Zaragoza, Mariano Esquillor 15, E-50018 Zaragoza, Spain;2. Department of Mechanical Engineering, University of Zaragoza, Maria de Luna, E-50018 Zaragoza, Spain