He, C.
Xu, B.
Chen, S.
Zhao, J.
Funding for this research was provided by:
National Natural Science Foundation of China (21477095, 21107106)
Postdoctoral Science Foundation of China (2014M550498)
Postdoctoral Science Foundation of Shaanxi Province
Natural Science Basic Research Plan in Shaanxi Province of China (2015JM2047)