1. Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, Minnesota 55455, TSI Inc., 500 Cardigan Road, P.O. Box 64384, St. Paul, Minnesota 55126, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan, Johnson Matthey Catalysts, Orchard Road, Royston, Herts, England SG8 5HE