This study was supported by the National Natural Science Foundation of China (No. 31071886/31372157),and the Program for Liaoning Excellent Talents in University (LJQ2013114).
This study was supported bythe National Natural Sciences Foundation of China(NSFC-30670239 ,30470213 ,30499341);the National Science Fundfor Fostering Talents in Basic Research(NSFC-J0630964) ;the Knowledge Innovation Program of Chinese Academy of Sciences(KSCX2-YW-Z-008 ,KSCX3-IOZ-0614);partly also by the Beijing Natural Science Foundation(6052017)