This paper studies the intramolecular photoinduced electron-transfer （PET） of covalent bonded azobenzene-perylene diimide （AZO-PDI） in solvents by using steady-state and time-resolved fluorescence spectroscopy tog...This paper studies the intramolecular photoinduced electron-transfer （PET） of covalent bonded azobenzene-perylene diimide （AZO-PDI） in solvents by using steady-state and time-resolved fluorescence spectroscopy together with ultrafast transient absorption spectroscopic techniques. Fast fluorescence quenching is observed when AZO-PDI is excited at characteristic wavelengths of AZO and perylene moieties. Reductive electron-transfer with transfer rate faster than 10^11 s^-1 is found. This PET process is also consolidated by femtosecond transient absorption spectra.展开更多
This paper proposes a lane detection algorithm based on multi-structure element model of morphological.The innovative point of the algorithm lies in the facts that the flexible structure has the multi-structure elemen...This paper proposes a lane detection algorithm based on multi-structure element model of morphological.The innovative point of the algorithm lies in the facts that the flexible structure has the multi-structure elements that lane model features have,and that the algorithm adopts the morphological filtering principle to extract the pixels in the image,which is similar to the lane model.In the algorithm,the interested area is extracted by a model of trapezium from original image,which is detected by the operator of Canny,and the lanes are extracted by the structure elements,which have similar characteristics to that of lane model.Several lines are detected by Hough transformation,then the traffic lanes are reconstructed.Experiments show that this algorithm is simple and robust,and can efficiently detect the lane mask accurately and quickly.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10504001,60878019,10821062,10934001,60677002 and 10828407)the National Basic Research Program of China (Grant Nos. 2009CB930504,2007CB307001,2006CB921601 and 2006CB806007)
文摘This paper studies the intramolecular photoinduced electron-transfer （PET） of covalent bonded azobenzene-perylene diimide （AZO-PDI） in solvents by using steady-state and time-resolved fluorescence spectroscopy together with ultrafast transient absorption spectroscopic techniques. Fast fluorescence quenching is observed when AZO-PDI is excited at characteristic wavelengths of AZO and perylene moieties. Reductive electron-transfer with transfer rate faster than 10^11 s^-1 is found. This PET process is also consolidated by femtosecond transient absorption spectra.
基金supported by the National 863 Program of China(No.2007AA012300)
文摘This paper proposes a lane detection algorithm based on multi-structure element model of morphological.The innovative point of the algorithm lies in the facts that the flexible structure has the multi-structure elements that lane model features have,and that the algorithm adopts the morphological filtering principle to extract the pixels in the image,which is similar to the lane model.In the algorithm,the interested area is extracted by a model of trapezium from original image,which is detected by the operator of Canny,and the lanes are extracted by the structure elements,which have similar characteristics to that of lane model.Several lines are detected by Hough transformation,then the traffic lanes are reconstructed.Experiments show that this algorithm is simple and robust,and can efficiently detect the lane mask accurately and quickly.
