Funding for this research was provided by:
National Natural Science Foundation of China (No. 51802273)
Foundation of Sichuan Educational Committee (No. 14ZB0050)
School Technology Fund of Southwest Petroleum University (No. 2013XJZ016)
College Students' Innovative Entrepreneurial Training Projects in Sichuan Province (No. 201710615067, No. 201810615090)
Key Project of Southwest Petroleum University Open Experiments (No. KSZ17111, NO. KSZ17112, NO. KSZ17083)
Ordinary Project of Southwest Petroleum University Open Experiments (No. KSP17086)
Article History
Received: 3 December 2018
Accepted: 27 April 2019
First Online: 1 June 2019
Compliance with ethical standards
: The author(s) declare that they have no competing interests.