1. College of Mechanical Engineering, Guangxi University, Nanning, Guangxi 530004, P. R. China
2. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, P. R. China
3. Key Laboratory for Power Machinery and Engineering of MOE, Shanghai Jiao Tong University, Shanghai 200240, PR China
4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China