1. McCoy College of Science, Mathematics & Engineering, Midwestern State University, a Member of the Texas Tech University System, Wichita Falls, TX 76308, USA
2. Materials & Manufacturing Systems Research Laboratory, GM R&D, 30470 Harley Earl Blvd., Warren, MI 48092, USA
3. Echometer Company, 5001 Ditto Ln, Wichita Falls, TX 76302, USA