A novel kind of polymeric solid electrolyte,PVAEO_16,which possesses both ion conduction and electrochromic characteristics,was synthesized.Its anion conductivity was 1.9× 10^(-6)S·cm^(-1)(25℃).PVAEO_(16)—...A novel kind of polymeric solid electrolyte,PVAEO_16,which possesses both ion conduction and electrochromic characteristics,was synthesized.Its anion conductivity was 1.9× 10^(-6)S·cm^(-1)(25℃).PVAEO_(16)—based ECD could display reversibly the color of yellow and bluish violet over 1.7 V.The color—changing response time was 0.6 s and 1.3 s(±2.0V),re- spectively.The storage time of bluish violet under open circuit was more than 16 hours.展开更多
Transient behavior of three-dimensional semiconductor device with heat conduc- tion is described by a coupled mathematical system of four quasi-linear partial differential equations with initial-boundary value conditi...Transient behavior of three-dimensional semiconductor device with heat conduc- tion is described by a coupled mathematical system of four quasi-linear partial differential equations with initial-boundary value conditions. The electric potential is defined by an ellip- tic equation and it appears in the following three equations via the electric field intensity. The electron concentration and the hole concentration are determined by convection-dominated diffusion equations and the temperature is interpreted by a heat conduction equation. A mixed finite volume element approximation, keeping physical conservation law, is used to get numerical values of the electric potential and the accuracy is improved one order. Two con- centrations and the heat conduction are computed by a fractional step method combined with second-order upwind differences. This method can overcome numerical oscillation, dispersion and decreases computational complexity. Then a three-dimensional problem is solved by computing three successive one-dimensional problems where the method of speedup is used and the computational work is greatly shortened. An optimal second-order error estimate in L2 norm is derived by using prior estimate theory and other special techniques of partial differential equations. This type of mass-conservative parallel method is important and is most valuable in numerical analysis and application of semiconductor device.展开更多
Nanocrystalline CdTe thin films were prepared by asymmetric rectangular pulse electrodeposition in organic solution at 110 degreesC. STM image shows a porous network morphology constructed by interconnected spherical ...Nanocrystalline CdTe thin films were prepared by asymmetric rectangular pulse electrodeposition in organic solution at 110 degreesC. STM image shows a porous network morphology constructed by interconnected spherical CdTe crystallites with a mean diameter of 4.2 nm. A pronounced size quantization was indicated in the action and absorption spectra. Potentials dependence dual conductive behavior was revealed in the photocurrent-potential (I-V) curves.展开更多
Electrical impedance measurements were performed on fine-grained concrete with low volume content of conductive steel and carbon fibres, either as a mono or as a hybrid system. The influences were investigated of the...Electrical impedance measurements were performed on fine-grained concrete with low volume content of conductive steel and carbon fibres, either as a mono or as a hybrid system. The influences were investigated of the applied frequencies, of fibre combinations and of the age of the composites on the impedance. The results show that when the applied frequency is increased from 0.98 Hz to 1000 Hz, the impedance of the fibre composites significantly decreases. At the same time, impedance difference between plain concrete and fibre-reinforced concrete is enhanced. Dramatic drop of impedance takes place over the low frequency range, i.e. 0.98 to approximately 31 Hz. Impedance also depends on the volume content of hybrid fibres. The cementitious composite with the highest content of hybrid fibres (1.0% steel fibres and 0.2% carbon fibres by volume) has the lowest impedance at all measuring frequencies. 0.6% fibres by volume seem to be a turning point, from which the variation of impedance slows down with the fibre content increases. On the other hand, the impedance increment of the fibre-reinforced composites slows down with the age after 28 days, comparing to plain concrete. (Author abstract) 8 Refs.展开更多
基金The project is supported by National Natural Seience Foundation of China.
文摘A novel kind of polymeric solid electrolyte,PVAEO_16,which possesses both ion conduction and electrochromic characteristics,was synthesized.Its anion conductivity was 1.9× 10^(-6)S·cm^(-1)(25℃).PVAEO_(16)—based ECD could display reversibly the color of yellow and bluish violet over 1.7 V.The color—changing response time was 0.6 s and 1.3 s(±2.0V),re- spectively.The storage time of bluish violet under open circuit was more than 16 hours.
基金supported by National Natural Science Foundation of China(11101244,11271231)National Tackling Key Problems Program(20050200069)Doctorate Foundation of the Ministry of Education of China(20030422047)
文摘Transient behavior of three-dimensional semiconductor device with heat conduc- tion is described by a coupled mathematical system of four quasi-linear partial differential equations with initial-boundary value conditions. The electric potential is defined by an ellip- tic equation and it appears in the following three equations via the electric field intensity. The electron concentration and the hole concentration are determined by convection-dominated diffusion equations and the temperature is interpreted by a heat conduction equation. A mixed finite volume element approximation, keeping physical conservation law, is used to get numerical values of the electric potential and the accuracy is improved one order. Two con- centrations and the heat conduction are computed by a fractional step method combined with second-order upwind differences. This method can overcome numerical oscillation, dispersion and decreases computational complexity. Then a three-dimensional problem is solved by computing three successive one-dimensional problems where the method of speedup is used and the computational work is greatly shortened. An optimal second-order error estimate in L2 norm is derived by using prior estimate theory and other special techniques of partial differential equations. This type of mass-conservative parallel method is important and is most valuable in numerical analysis and application of semiconductor device.
文摘Nanocrystalline CdTe thin films were prepared by asymmetric rectangular pulse electrodeposition in organic solution at 110 degreesC. STM image shows a porous network morphology constructed by interconnected spherical CdTe crystallites with a mean diameter of 4.2 nm. A pronounced size quantization was indicated in the action and absorption spectra. Potentials dependence dual conductive behavior was revealed in the photocurrent-potential (I-V) curves.
文摘Electrical impedance measurements were performed on fine-grained concrete with low volume content of conductive steel and carbon fibres, either as a mono or as a hybrid system. The influences were investigated of the applied frequencies, of fibre combinations and of the age of the composites on the impedance. The results show that when the applied frequency is increased from 0.98 Hz to 1000 Hz, the impedance of the fibre composites significantly decreases. At the same time, impedance difference between plain concrete and fibre-reinforced concrete is enhanced. Dramatic drop of impedance takes place over the low frequency range, i.e. 0.98 to approximately 31 Hz. Impedance also depends on the volume content of hybrid fibres. The cementitious composite with the highest content of hybrid fibres (1.0% steel fibres and 0.2% carbon fibres by volume) has the lowest impedance at all measuring frequencies. 0.6% fibres by volume seem to be a turning point, from which the variation of impedance slows down with the fibre content increases. On the other hand, the impedance increment of the fibre-reinforced composites slows down with the age after 28 days, comparing to plain concrete. (Author abstract) 8 Refs.
