1. Visiting Fellow, National Research Council of Cananda, 1200 Montreal Rd., Bldg. M-20, Ottawa, Canada, K1A 0R6; formerly, Independent Consultant, 3721 Khayyam Ave. # 2, Orlando, FL 32826.
2. Associate Professor, Civil and Environmental Engineering, Univ. of Central Florida, P.O. Box 162450, Orlando, FL 32816.
3. Process Engineer, Timmons Group, 711 N. Courthouse Rd., Richmond, VA 23236.
4. Professor, Civil and Environmental Engineering, Univ. of Central Florida, P.O. Box 162450, Orlando, FL 32816.