1. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR 97330 e-mail:
2. School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99163
3. Industrial & Systems Engineering, University of Washington, Seattle, WA 98195
4. Department of Mechanical Engineering, Washington State University, Vancouver, WA 98686
5. Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403