Affiliation: | 1. Department of Mathematics, University of Science and Technology of China,Hefei 230026, P.R.China;State Key Laboratory of Fire Science of University of Science and Technology of China, Hefei 230027, P.R.China 2. State Key Laboratory of Fire Science of University of Science and Technology of China, Hefei 230027, P.R.China 3. Department of Mathematics, University of Science and Technology of China,Hefei 230026, P.R.China;School of Basic Science, Chinese University of Mining and Technology,Beijing 100083, P.R.China 4. Department of Mathematics, University of Science and Technology of China,Hefei 230026, P.R.China |