国家科技支撑计划项目2006BAC01A16,2011BAC09B01National Key Technology Research and Development Program of the Ministry of Science and Technology of China2006BAC01A16,2011BAC09B01;重庆市自然科学基金重点项目CSTC2009BA0002Key Program of the Natural Science Foundation of ChongqingCSTC2009BA0002