Based on the experimental data of KY 3F 10∶Tm 3+ reported by Diaf, K ushida′s spectral overlap model (SOM) of energy transfer between J-multipl ets was studied. Firstly, with the help of the Inokuti-Hirayama an...Based on the experimental data of KY 3F 10∶Tm 3+ reported by Diaf, K ushida′s spectral overlap model (SOM) of energy transfer between J-multipl ets was studied. Firstly, with the help of the Inokuti-Hirayama and Yokota-Tan imoto models, the luminescence decay curve of 3H 4 of Tm 3+ ion was fitted, and the fitted values of corresponding interaction parameters C D A of energy transfer and C DD of energy migration were obtained. Seco ndly, by compared with Kushida′s SOM in which the relevant Judd-Ofelt approxim ative transition rates are known, the average overlap integrals of S DD and S DA were obtained. For S DD, how to treat the contributi on of the electronic-dipole (ED) crystal field transition forbidden by C 4v site symmetry in the calculation of S DD was discussed. For S DA we suggested that, by including the contribution of the phonon sideba nds in the analysis of oscillator strength of transition, Kushida′s SOM of ED- ED resonant energy transfer rate can be extended to non-resonant phonon-assist ed D-A energy transfer. The strengths and widths of phonon sidebands in this ex ample were discussed, and the results were reasonably good.展开更多
Fluorescence resonance energy transfer(FRET)is an important photophysical mechanism whichfinds many applications in biophotonics,particularly in biological sensing and imaging.It is well known,there are two major fact...Fluorescence resonance energy transfer(FRET)is an important photophysical mechanism whichfinds many applications in biophotonics,particularly in biological sensing and imaging.It is well known,there are two major factors that determine the efficiency of FRET.One is the distance between the donor and the acceptor,and the other is the overlap of the donor's emission and the acceptor's absorption spectra.However,while the distance-modulation of FRET is very popular,the spectral-overlap-modulation draws much less attention.In this talk,I would like to illustrate the importance of the strategy of spectral-overlapmodulation.The presentation will include our works on the construction of highly efficient FRET systems featuring the short and rigid linker between the donor and acceptor moieties,and several typical examples of spectral-overlap-modulation strategy applied in the development of ratiometric sensors.展开更多
A new fuzzy support vector machine algorithm with dual membership values based on spectral clustering method is pro- posed to overcome the shortcoming of the normal support vector machine algorithm, which divides the ...A new fuzzy support vector machine algorithm with dual membership values based on spectral clustering method is pro- posed to overcome the shortcoming of the normal support vector machine algorithm, which divides the training datasets into two absolutely exclusive classes in the binary classification, ignoring the possibility of ＂overlapping＂ region between the two training classes. The proposed method handles sample ＂overlap＂ effi- ciently with spectral clustering, overcoming the disadvantages of over-fitting well, and improving the data mining efficiency greatly. Simulation provides clear evidences to the new method.展开更多
文摘Based on the experimental data of KY 3F 10∶Tm 3+ reported by Diaf, K ushida′s spectral overlap model (SOM) of energy transfer between J-multipl ets was studied. Firstly, with the help of the Inokuti-Hirayama and Yokota-Tan imoto models, the luminescence decay curve of 3H 4 of Tm 3+ ion was fitted, and the fitted values of corresponding interaction parameters C D A of energy transfer and C DD of energy migration were obtained. Seco ndly, by compared with Kushida′s SOM in which the relevant Judd-Ofelt approxim ative transition rates are known, the average overlap integrals of S DD and S DA were obtained. For S DD, how to treat the contributi on of the electronic-dipole (ED) crystal field transition forbidden by C 4v site symmetry in the calculation of S DD was discussed. For S DA we suggested that, by including the contribution of the phonon sideba nds in the analysis of oscillator strength of transition, Kushida′s SOM of ED- ED resonant energy transfer rate can be extended to non-resonant phonon-assist ed D-A energy transfer. The strengths and widths of phonon sidebands in this ex ample were discussed, and the results were reasonably good.
基金We thank National Natural Science Foundation of China(No.21174022)Specialized Research Fund for the Doctoral Program of Higher Education(No.20110041110009)forfinancial support.And we also thank Prof.Xuhong Qian(East China University of Science and Technology)and Prof.Xiaojun Peng(Dalian University of Technology)for their helpful discussions.
文摘Fluorescence resonance energy transfer(FRET)is an important photophysical mechanism whichfinds many applications in biophotonics,particularly in biological sensing and imaging.It is well known,there are two major factors that determine the efficiency of FRET.One is the distance between the donor and the acceptor,and the other is the overlap of the donor's emission and the acceptor's absorption spectra.However,while the distance-modulation of FRET is very popular,the spectral-overlap-modulation draws much less attention.In this talk,I would like to illustrate the importance of the strategy of spectral-overlapmodulation.The presentation will include our works on the construction of highly efficient FRET systems featuring the short and rigid linker between the donor and acceptor moieties,and several typical examples of spectral-overlap-modulation strategy applied in the development of ratiometric sensors.
基金supported by the National Natural Science Foundation of China (7083100170821061)
文摘A new fuzzy support vector machine algorithm with dual membership values based on spectral clustering method is pro- posed to overcome the shortcoming of the normal support vector machine algorithm, which divides the training datasets into two absolutely exclusive classes in the binary classification, ignoring the possibility of ＂overlapping＂ region between the two training classes. The proposed method handles sample ＂overlap＂ effi- ciently with spectral clustering, overcoming the disadvantages of over-fitting well, and improving the data mining efficiency greatly. Simulation provides clear evidences to the new method.
