1. Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 314, Leonhard Building, University Park, Pennsylvania 16802, USA
2. Kettering Laboratories, Department of Chemical and Materials Engineering, University of Dayton, Room 508A, Ohio 45469, USA
3. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson AFB, 3005 Hobson Way, Building 651/253, Ohio 45433, USA