1. Professor, Dept. of Mechanical and Materials Engineering, Univ. of Nebraska, W342 Nebraska Hall, Lincoln, NE 68588-0526 (corresponding author).
2. Engineer, WJB Group, 535 Brea Canyon Rd., City of Industry, CA 91789.
3. Assistant Professor, Stark Learning Center 236, Wilkes Univ., Wilkes-Barre, PA 18766.