1. Department of Mechanical Engineering, University of California, 6141 Etcheverry Hall, Berkeley, CA 94720, USA
2. U.S. Department of Agriculture, Western Regional Research Center, 800 Buchanan St., Albany, CA 94710, USA
3. J. Mike Walker ’66 Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843, USA
4. Department of Materials Science & Engineering, Texas A&M University, 3003 TAMU, College Station, TX 77843, USA