Funding for this research was provided by:
Youth research program in humanities and social sciences, ministry of education (18YJC910013)
Collaborative Innovation Center of Major Machine Manufacturing in Liaoning (18B010)
National Natural Science Foundation of China (71573034)
Natural Science Foundation of Liaoning Province (L17CTJ001, L17BJY042)
Applied Basic Research Key Project of Yunnan (DUFE2017Q16)
Article History
Received: 7 March 2019
Accepted: 3 July 2019
First Online: 8 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.