Two strong fluorescent amphiphilic europium-dibenzoylmethane complexs Me3NC 16,H33.F(DBM)(A) and Et3NC18H37.Eu(DUM)4 (B) have heed synthesized and1 their Langmuir films have been formed at theair/water interfac.The La...Two strong fluorescent amphiphilic europium-dibenzoylmethane complexs Me3NC 16,H33.F(DBM)(A) and Et3NC18H37.Eu(DUM)4 (B) have heed synthesized and1 their Langmuir films have been formed at theair/water interfac.The Langmuir film of of A can be easily transferred onto hydrophific substrates with transferratio around unity to huild up Langmuir-Blodgett(LB)films.The LB films were characterized by UV-vis speetraand low-angle X-ray diffraction. Their fluorescence spectra and fluorescence lifetime have heen studied both insolution and highly ordered LB films.展开更多
In this paper a simple and efficient implicit finite-difference scheme is used for depth-averaged two-dimensional storm surge model. This finite-difference scheme is simpler and more efficient than the widely-used ADI...In this paper a simple and efficient implicit finite-difference scheme is used for depth-averaged two-dimensional storm surge model. This finite-difference scheme is simpler and more efficient than the widely-used ADI scheme. Accuracy analysis and stability analysis indicate that the scheme has two-order accuracy and is unconditionally stable when the grid size is constant. The present analysis results show that the scheme is of higher numerical accuracy than that introduced by Maa (1990). After tested by ideal models, a calculation example of a real typhoon surge is carried out, the results of the numerical simulation coincide well with the observed data and the accuracy is sufficient for engineering applications.展开更多
文摘Two strong fluorescent amphiphilic europium-dibenzoylmethane complexs Me3NC 16,H33.F(DBM)(A) and Et3NC18H37.Eu(DUM)4 (B) have heed synthesized and1 their Langmuir films have been formed at theair/water interfac.The Langmuir film of of A can be easily transferred onto hydrophific substrates with transferratio around unity to huild up Langmuir-Blodgett(LB)films.The LB films were characterized by UV-vis speetraand low-angle X-ray diffraction. Their fluorescence spectra and fluorescence lifetime have heen studied both insolution and highly ordered LB films.
文摘In this paper a simple and efficient implicit finite-difference scheme is used for depth-averaged two-dimensional storm surge model. This finite-difference scheme is simpler and more efficient than the widely-used ADI scheme. Accuracy analysis and stability analysis indicate that the scheme has two-order accuracy and is unconditionally stable when the grid size is constant. The present analysis results show that the scheme is of higher numerical accuracy than that introduced by Maa (1990). After tested by ideal models, a calculation example of a real typhoon surge is carried out, the results of the numerical simulation coincide well with the observed data and the accuracy is sufficient for engineering applications.
