1. Department of Mechanical Engineering, National University of Singapore, 21 Lower Kent Ridge Rd, 117575, Singapore
2. National University of Singapore Suzhou Research Institute, Suzhou 215123, P. R. China
3. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, ul. Wybickiego 7, 31-261 Krakow, Poland
4. School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, P. R. China