The electroreduction of Y(Ⅲ)on tungsten electrode in NaCl-KCl-YCl_3 melt has been investi- gated by cyclic voltammetry.Deposition of Y(Ⅲ)to Y(0)is reversible in one step.The cyclic voltammetry, convolution voltammet...The electroreduction of Y(Ⅲ)on tungsten electrode in NaCl-KCl-YCl_3 melt has been investi- gated by cyclic voltammetry.Deposition of Y(Ⅲ)to Y(0)is reversible in one step.The cyclic voltammetry, convolution voltammetry,potential-time curve after potentiostatic electrolysis and X-ray diffraction analy- sis were used to study the electrode process of Y(Ⅲ)reduced on iron electrode.Several Y-Fe intermetallic compounds are formed before the deposition of metallic yttrium.The diffusion coefficient and diffusion activation energy of Y in Y_6Fe_(23) were determined by current-time curve at potential step. The results indicate the diffusion of Y in its alloy phase is so slow that this step will control the electrode pro- cess.展开更多
A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rig...A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rigidly proven under these conditions that 1+1-dimensional spatial solitons can exist in Kerr media but 2+1-dimensional solitons cannot. A new form of the general equation for 1+1-dimensional solitons in Kerr media is put forward and some of its solutions have been obtained.展开更多
The fluorescent decays and spectra of pump power density dependent emission demonstrated that the excitation power density was enhanced in Rh640 dye solution containing scattering nanoparticles.Lasing in disordered sc...The fluorescent decays and spectra of pump power density dependent emission demonstrated that the excitation power density was enhanced in Rh640 dye solution containing scattering nanoparticles.Lasing in disordered scattering medium with low threshold,narrow bandwidth,and short duration was observed.The mechanism of this enhancement,together with the lasing properties of low threshold and narrow bandwidth,was discussed.展开更多
基金The project supported by the National Natural Science Foundation of China
文摘The electroreduction of Y(Ⅲ)on tungsten electrode in NaCl-KCl-YCl_3 melt has been investi- gated by cyclic voltammetry.Deposition of Y(Ⅲ)to Y(0)is reversible in one step.The cyclic voltammetry, convolution voltammetry,potential-time curve after potentiostatic electrolysis and X-ray diffraction analy- sis were used to study the electrode process of Y(Ⅲ)reduced on iron electrode.Several Y-Fe intermetallic compounds are formed before the deposition of metallic yttrium.The diffusion coefficient and diffusion activation energy of Y in Y_6Fe_(23) were determined by current-time curve at potential step. The results indicate the diffusion of Y in its alloy phase is so slow that this step will control the electrode pro- cess.
基金Supported by the National Natural Science Foundation of China under Grant No.69789801。
文摘A new vector theory which concerns the necessary and sufficient conditions of the self-trapping of a linearly polarized light beam in Kerr media is presented after a generalization of Fermat's principle. It is rigidly proven under these conditions that 1+1-dimensional spatial solitons can exist in Kerr media but 2+1-dimensional solitons cannot. A new form of the general equation for 1+1-dimensional solitons in Kerr media is put forward and some of its solutions have been obtained.
基金Supported by the National Natural Science Foundation of China under Grant No.19574077the National Reseach Project of 863-416 High Technology,and the Guangdong Natural Science Foundation.
文摘The fluorescent decays and spectra of pump power density dependent emission demonstrated that the excitation power density was enhanced in Rh640 dye solution containing scattering nanoparticles.Lasing in disordered scattering medium with low threshold,narrow bandwidth,and short duration was observed.The mechanism of this enhancement,together with the lasing properties of low threshold and narrow bandwidth,was discussed.
