1. School of Science, Beijing University of Civil Engineering and Architecture, Beijing 100044, P. R. China
2. Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, P. R. China
3. Department of Computer Science, Bahria University, Islamabad 44000, Pakistan
4. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia