[1] Iowa State Univ, Dept Geol & Atmospher Sci, Ames, IA 50011 USA
[2] Western Michigan Univ, Coll Arts & Sci, Kalamazoo, MI USA
[3] North Dakota State Univ, Dept Ind & Mfg Engn, Fargo, ND USA
[4] Michigan Technol Univ, Dept Chem Engn, Houghton, MI USA
[5] Univ Dayton, Coll Engn, Dayton, OH USA