| 2006~present, Professor in Polymer 
                      Science & Engineering, Tsinghua University, Beijing, 
                      China
                      2001~2005, Associate professor in Polymer 
                      Science & Engineering, Tsinghua University, Beijing, 
                      China
 2003~2004, Visiting professor in Department of Chemical 
                      & Materials Engineering, University of Alberta, Edmonton, 
                      Canada
 1999~2001, Postdoctoral fellow in Tsinghua University, Beijing, 
                      China
 1995~1996, Associate professor in Polymer Sicence, Shandong 
                      University, Jinan, China
 1987~1994, Lecturer in Department of Chemistry, Shandong 
                      University, Jinan, China
 1982~1984 Assistant Engineer in Zhengzhou Institute of Chinese 
                      Tobacco Company, Zhengzhou, China
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