Affiliation: | a Faculty of Science, Xi’an Jiaotong University, Xi’an 710049, PR Chinab Faculty of Science, Xi’an University of Architecture and Technology, Xi’an 710054, PR Chinac Department of Mathematics, Baoji University of Arts and Sciences, Baoji 721007, PR Chinad Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive N.W. Calgary, Alberta T2N 1N4, Canada |