Affiliation: | 1. Physics Department, Xi’an University of Architecture and Technology, Xi’an 710055, People''s Republic of China;2. Xi’an Technological University Industrial Center, Xi’an 710021, People''s Republic of China;1. Universidad de Sevilla (Spain), Universidad Autónoma de Chile (Chile), Department of Economic Analysis and Political Economy, Avda, Ramón y Cajal 1, 41018, Seville, Spain;2. Universidad de Sevilla, Seville, Spain;1. Energy Studies Institute, National University of Singapore, Singapore;2. School of Economics & Management, Southwest Jiaotong University, Chengdu 610100, PR China;3. Department of Industrial Systems Engineering and Management, National University of Singapore, Singapore;1. Universidad Autónoma de Chile, Chile;2. Universidad de Sevilla, Spain |