1. Graduate Research Assistant, Dept. of Agricultural and Biosystems Engineering, The Univ. of Arizona, Tucson, AZ, 85721. E-mail: pedromer@email.arizona.edu
2. Research Scientist, Sandia National Laboratories, P.O. Box 5800, MS-0735, Albuquerque, NM, 87185-0735. E-mail: ckho@sandia.gov
3. Professor, Agricultural and Biosystems Engineering, The Univ. of Arizona, Tucson, AZ, 85721. E-mail: cchoi@arizona.edu