Abstract

This research was partially supported by National Key Research Program of China (grant number 2016YFC0701400), National Natural Science Foundation of China (grant number 51338004), and the Discovery Grant program of the Natural Science and Engineering Research Council (NSERC) Canada. The study was conducted during the first author’s visiting research at Ryerson University. The funding support from the China Scholarship Council (CSC) for the first author is also gratefully acknowledged.

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