1. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
3. Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
4. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611 e-mail:
5. Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118