Date of Acceptance:22/10/2015 This research recieved funds from the National Natural Science Foundation of China (Grant Nos. 61377067, 10575016, 11262006) and the Fundamental Research Funds for the Central Universities. W.L. was supported by the project of high school of Jiangxi province (Grant No. KJLD14047), and the training plan of young scientists of Jiangxi province.
展开▼