1. Department
of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
2. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
3. Department
of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
4. Fort Lewis College, Durango, Colorado 81301, United States
5. The
Energy Institute, Colorado State University, Fort Collins, Colorado 80523, United States