1. Department of Biological Systems Engineering Washington State University Pullman WA 99163 U.S.A.
2. Department of Agricultural Engineering, College of Food and Agriculture Sciences King Saud University P.O. Box 2460 Riyadh 11451 Saudi Arabia
3. Postharvest Laboratory, Department of Horticulture and Landscape Architecture Washington State University Pullman WA 99164‐6414 U.S.A.
4. The U.S. Army Combat Capabilities Development Command Soldier Center Natick MA 01760 U.S.A.