Funding for this research was provided by:
The Natural Science Foundation of Heilongjiang Province (A201207)
The Science and Technology Innovation Team in Higher Education Institutions of Heilongjiang Province (2014TD005)
The Innovation Project for University Students of Heilongjiang Province (201610236006)
Article History
Received: 11 January 2017
Revised: 6 June 2017
Accepted: 21 August 2017
First Online: 13 March 2018