1. Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
2. Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong
3. Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi'an Shaanxi 710072 P. R. China