Rotational isomerism effects on the optical spectra of a push-pull nonlinear optical chro-mophore 2-dicyanomethylen-3-cyano-4-f2-[E-（4-N,N-di（2-acetoxyethyl）-amino）-phenylene-（3,4-dibutyl）-thien-5]-E-vinylg-5,5-...Rotational isomerism effects on the optical spectra of a push-pull nonlinear optical chro-mophore 2-dicyanomethylen-3-cyano-4-f2-[E-（4-N,N-di（2-acetoxyethyl）-amino）-phenylene-（3,4-dibutyl）-thien-5]-E-vinylg-5,5-dimethyl-2,5-dihydrofuran （FTC） in a few solvents have been studied using the time-dependent density functional theory in combination with the polarizable continuum model. It is shown that the maximum absorption peaks of the ro-tamers have difference of nearly 30 nm both in vacuum and in solutions. The population of the rotamers changes a lot in different solvents. Based on the geometries optimized by Hartree-Fock method, the Maxwell-Boltzmann averaged absorption has been calculated and the maximum absorption peak is in good agreement with experiment. It indicates that the bond length alternation can have an important effect on the optical spectra.展开更多
异源遥感图像处理中不同传感器由于成像机理和工作原理不同,异源图像之间往往存在较大辐射差异和几何形变,使得异源图像的局部不变特征描述成为一项具有挑战性工作。针对异源遥感图像局部特征描述符可区分性不足、旋转变化的稳健性不强...异源遥感图像处理中不同传感器由于成像机理和工作原理不同,异源图像之间往往存在较大辐射差异和几何形变,使得异源图像的局部不变特征描述成为一项具有挑战性工作。针对异源遥感图像局部特征描述符可区分性不足、旋转变化的稳健性不强及计算效率较低等问题,论文展开了一系列深入研究,主要研究工作如下:(1)HOMPC(histograms of oriented magnitudes and phase congruency):可区分的异源遥感图像局部特征描述符。目前的局部特征描述符对非线性辐射差异的图像稳健性不足而导致描述符的可区分度不高。展开更多
基金ACKNOWLEDGMENTS This work was supported by Young Scientists Fund of the National Natural Science Foundation of China （No.10904085）.
文摘Rotational isomerism effects on the optical spectra of a push-pull nonlinear optical chro-mophore 2-dicyanomethylen-3-cyano-4-f2-[E-（4-N,N-di（2-acetoxyethyl）-amino）-phenylene-（3,4-dibutyl）-thien-5]-E-vinylg-5,5-dimethyl-2,5-dihydrofuran （FTC） in a few solvents have been studied using the time-dependent density functional theory in combination with the polarizable continuum model. It is shown that the maximum absorption peaks of the ro-tamers have difference of nearly 30 nm both in vacuum and in solutions. The population of the rotamers changes a lot in different solvents. Based on the geometries optimized by Hartree-Fock method, the Maxwell-Boltzmann averaged absorption has been calculated and the maximum absorption peak is in good agreement with experiment. It indicates that the bond length alternation can have an important effect on the optical spectra.
文摘异源遥感图像处理中不同传感器由于成像机理和工作原理不同,异源图像之间往往存在较大辐射差异和几何形变,使得异源图像的局部不变特征描述成为一项具有挑战性工作。针对异源遥感图像局部特征描述符可区分性不足、旋转变化的稳健性不强及计算效率较低等问题,论文展开了一系列深入研究,主要研究工作如下:(1)HOMPC(histograms of oriented magnitudes and phase congruency):可区分的异源遥感图像局部特征描述符。目前的局部特征描述符对非线性辐射差异的图像稳健性不足而导致描述符的可区分度不高。
