1. School of Science, Nanjing Forestry University, Nanjing, Jiangsu 210037,
P. R. China
2. College of
Information Science
and Technology, Nanjing Forestry University, Nanjing, Jiangsu 210037, P. R. China
3. School of Wood Science and Technology, Nanjing Forestry University, Nanjing, Jiangsu 210037,
P. R. China
4. Department
of Applied Physics, Nanjing University of Science and Technology, Nanjing,
Jiangsu 210094, P. R. China