1. School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, Louisiana 70803, United States
2. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
3. Key Biomass Energy Laboratory of Henan Province, Zhengzhou, 450008 Henan, China
4. Department of Forest Products, Korea Forest Research Institute, Seoul 130-712, Korea