Funding for this research was provided by:
National Natural Science Foundation of China (61501494, 61471389, 61671464, and 61701523)
Natural Science Foundation of Jilin Province (2017JM6025)
Natural Science Foundation of Shaanxi Provincial Department of Education (2017KJX-24)
the Young Talent fund of University Association for Science and Technology in Shaanxi (20170107)
National Defense Foundation of China (2201078)
Aviation Science Foundation of China (20161996009)
Text and Data Mining valid from 2018-11-29
Received: 8 September 2018
Accepted: 19 November 2018
First Online: 29 November 2018
: The authors declare that they have no competing interests.
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