1. Guangxi Key Laboratory of Ocean Engineering Equipment and Technology, Qinzhou 535011, P.R. China
2. Key Laboratory of Beibu Gulf Offshore Engineering Equipment and Technology, Beibu Gulf University, Education Department of Guangxi Zhuang Autonomous Region, Qinzhou 535011, P.R. China
3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China