This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0)
(https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the
work is properly cited.
* Address correspondence to this author at the Yan Ta Road No.126, School
of Environment Science & Engineering, Chang’an University, Xi’an
710054, China; Tel: +8613032918202; E-mail: firstname.lastname@example.org