**Author details**

Le Dai Vuong1 \*, Vo Thanh Tung2 and Phan Dinh Gio2

1 Faculty of Chemical and Environmental Engineering, Hue Industrial College, Hue City, Vietnam

2 Department of Physics, College of Sciences, Hue University, Vietnam

\*Address all correspondence to: ledaivuongqb@gmail.com

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
