基金This work was supported by the National Natural Science Foundation of China(10571093,10671099,10771123)the Research Foundation for Doctor Programma(20050055038)+1 种基金the Natural Science Foundation of Shandong Province(Q2007A05)the Scien-tific Research Start-up Foundation of QFNU(bsqd07028)
基金Supported by the NNSF of China(10826059,10901092)the NSF of Shandong Province of China (Q2007A05)the China Postdoctoral Science Foundation and the Scientific Research Start-up Foundation of QFNU(BSQD07028)