1. Visiting Researcher, Dept. of Mechanical Engineering, Univ. of Houston, Houston, TX 77004 (corresponding author).
2. Research Associate, Dept. of Mechanical Engineering, Univ. of Houston, Houston, TX 77004.
3. John and Rebecca Moores Professor, Dept. of Mechanical Engineering, Univ. of Houston, Houston, TX 77004.
4. Edwin B. and Norma S. McNeil Distinguished Professor, Dept. of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803.