1. Department of Mathematics, Huzhou University, Huzhou 313000, P. R. China
2. Hunan Provincial Key Laboratory of Mathematical Modeling and, Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, P. R. China
3. Department of Chemical Engineering, School of Engineering & Applied Science, Khazar University, Baku, Azerbaijan
4. Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran