Cao, Danyang http://orcid.org/0000-0002-9779-9466
Liu, Jie
Funding for this research was provided by:
Beijing Natural Science Foundation (4144073)
Fund of North China University of Technology (E.S.H., 2013)
National Natural Science Foundation of China (41471303)
training project for outstanding young teachers of North China University of Technology (E.S.H., 2013)