1. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
3. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India
5. Departments of Mechanical and Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia