1. Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto M5S 3G8, Ontario, Canada
2. Department of Civil and Environmental Engineering, University of Alberta, 9211 - 116 Street NW, Edmonton, Alberta T6G 1H9, Canada
3. Schlumberger-Doll Research, 1 Hampshire Street, Cambridge, Massachusetts 02139, United States