Xutao Liao  ^1,2, Tianqiu Hong¹, Mingwu Yang³ and Dongjia Liu¹

¹School of Resources & Environmental Engineering, Hefei University of Technology, Hefei 230009, P.R. China
²Anhui Urban Construction Design Institute Co., Ltd., Hefei 230051, P.R. China
³School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, P.R. China

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