Funding for this research was provided by:
the National Natural Science Foundation of China (Grant No. (41302223)
Science and Technology Plan Projects of Chongqing Administration of Land, Resources and Housing (KJ-2015047)
Chongqing No.3 colleges and universities youth backbone teachers funding plans
Chongqing Research Program of Basic Research and Frontier Technology (cstc2016jcyjA0074, cstc2016jcyjA0933)
Article History
Received: 23 October 2017
Accepted: 17 August 2018
First Online: 30 August 2018