Funding for this research was provided by:
the Ph.D. Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities (HEUGIP201803)
the National Natural Science Foundation of China (51509046, 51509045, 51879047)
the Natural Science Foundation of Heilongjiang Province of China (E2017029)
the Fundamental Research Funds for the Central Universities (HEUCF180103)
Article History
Received: 22 June 2018
Accepted: 31 December 2018
First Online: 10 January 2019