Open Access
Issue
JNWPU
Volume 36, Number 3, June 2018
Page(s) 577 - 581
DOI https://doi.org/10.1051/jnwpu/20183630577
Published online 08 October 2018

© 2018 Journal of Northwestern Polytechnical University. All rights reserved.

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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