1. ASEE Postdoctoral Program, U.S. Naval Research Laboratory, Washington, District of Columbia 20375, United States
2. EXCET Inc., Springfield, Virginia 22151, United States
3. U.S. Naval Research Laboratory, Washington, District of Columbia 20375, United States
4. Department of Mechanical Engineering, Tufts University, 200 Boston Avenue 2600, Medford, Massachusetts 02155, United States