基金the National Natural Science Foundation of China (Grant No. 60572027)the Program for New Century Excellent Talents in University of China (Grant No. NCET-05-0794)+2 种基金the Sichuan Youth Science & Technology Foundation (Grant No. 03ZQ026-033)the National Defense Pre-research Foundation of China (Grant No. 51430804QT2201)the Application Basic Foundation of Sichuan Province, China (Grant No. 2006 J13-10)