基金National Natural Science Foundation of China(30870657,30970775,81101106,61108081)Chinese National Programs for High Technology Research and Development(2009AA02Z413)+2 种基金Tianjin Municipal Government of China(09JCZDJC18200,10JCZDJC17300)Tianjin Natural Science Foundation of China(12JCQNJC09400)Ph.D.Programs Foundation of Ministry of Education of China(20100032120064 and 20110032120069)