1. Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210
2. School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0295
3. School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0295; G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0295