1. Professor, Advisor to the Assistant Provost for Research, Dept. of Civil and Environmental Engineering, UAE Univ., P.O. Box 17555, Al Ain, United Arab Emirates. E-mail: Mohamed.A@uaeu.ac.ae
2. Project Manager, PMK Group, Consulting and Environmental Engineers, 629 Springfield Rd., Kenilworth, NY 07033.
3. Webster Professor of Mining Engineering, Director of Mining Engineering Program, Dept. of Mining and Metallurgical Engineering, McGill Univ., 3450 University Street, Montreal, Quebec, H3A 2A7 Canada.