Funding for this research was provided by:
Major Research Plan of the National Natural Science Foundation of China (91538201)
National Natural Science Foundation of China (61671463)
National Natural Science Foundation of China (61571454)
Program for New Century Excellent Talents in University (NCET-11-0872)
Specific fund for Taishan Scholars Project (ts201712072)
Excellent Youth Scholar of the National Defense Science and Technology Foundation of China
Natural Science Foundation of Shandong Province (ZR2017BG014)
Article History
Received: 6 January 2018
Revised: 1 April 2018
Accepted: 27 April 2018
First Online: 7 May 2018