1. Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
2. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
3. Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA
4. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA
5. U.S. Naval Research Laboratory, Washington, DC 20375, USA
6. Center for Integrated Mobility Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA