1. Research Assistant, Dept. of Material Science and Engineering, Univ. of Texas at Arlington, Nedderman Hall 417, 416 Yates St., Arlington, TX 76019.
2. Postdoctoral Researcher, Dept. of Civil Engineering, Univ. of Texas at Arlington, Nedderman Hall 417, 416 Yates St., Arlington, TX 76019.
3. Professor, Dept. of Civil Engineering, Univ. of Texas at Arlington, Nedderman Hall 417, 416 Yates St., Arlington, TX 76019.
4. Professor, Dept. of Material Science and Engineering, Univ. of Texas at Arlington, Nedderman Hall 417, 416 Yates St., Arlington, TX 76019 (corresponding author).