1. MOE Key Laboratory of Regional Energy and Environmental Systems Optimization, Resources and Environmental Research Academy, North China Electric Power University, Beijing 102206, China
2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
3. Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington St, Bldg D, Rm D215, P.O. Box 15000, Halifax, NS B3H 4R2, Canada