Funding for this research was provided by:
National Natural Science Foundation of China (61701134)
Natural Science Foundation of Heilongjiang Province, China (F2017004)
National Key Research and Development Program of China (No. 2016YFF010280)
Fundamental Research Funds for the Central Universities of China (HEUCFM180801, HEUCFM180802)
Ph.D. Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities of China (HEUGIP201708)
Article History
Received: 26 December 2017
Revised: 17 August 2018
Accepted: 17 August 2018
First Online: 23 August 2018