1. Ph.D. Candidate, Dept. of Mechanical Science and Engineering, Univ. of Illinois at Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801.
2. Professor, Dept. of Mechanical Engineering, Khalifa Univ. of Science, Technology, and Research, Al Saada St., Abu Dhabi 127788, UAE; and Associate Professor, Dept. of Mechanical Science and Engineering, Univ. of Illinois at Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801 (corresponding author).