1. Department of Chemical Engineering, Northwestern University, Evanston, IL 60208
2. Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ 08855
3. At General Electric Corporate R&D, Post Office Box 8, Schenectady, NY 12301
4. Department of Chemical Engineering, University of Colorado, Boulder, CO 80309
5. At Chevron Oil Field Research Company, Post Office Box 446, La Habra, CA 90633