1. Assistant Professor, Dept. of Civil Engineering, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Jawahar Nagar, Shameerpet (mandal), R. R. District, Hyderabad, Andhra Pradesh 500 078, India (corresponding author).
2. TEES Research Professor, Dept. of Biological and Agricultural Engineering, Texas A&M Univ., 302 B Scoates Hall, Mail Stop 2117, College Station, TX 77843-2117.