Funding for this research was provided by:
the China Manned Space Flight Technology project TG-2
the National Natural Science Foundation of China (31670864)
the National natural fund joint fund project (U1738106)
the Strategic Pioneer Projects of CAS (XDA15013900)
the National Science Foundation for Young Scientists of China (31500687)
Article History
Received: 27 February 2018
Accepted: 13 July 2018
First Online: 23 July 2018