Funding for this research was provided by:
National Natural Science Foundation of China (Grant No. 21203041)
Natural Science Foundation of Heilongjiang province in China (Grant No. B2016004)
Fundamental Research Funds for the Central Universities in China (Grant No. HIT. NSRIF. 2017033)
he open project of Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education (Grand No. KF20151105)
Article History
Received: 5 April 2018
Accepted: 27 June 2018
First Online: 9 July 2018
Compliance with ethical standards
:
: There are no conflicts of interest to declare.