After trace Sm^3＋ ions and Gd^3＋ ions doping, the emission intensity of red phosphors Y2O2S： Eu^3 ＋ was enhanced and the voltage character （relation between emission intensity and excitation voltage） was improve...After trace Sm^3＋ ions and Gd^3＋ ions doping, the emission intensity of red phosphors Y2O2S： Eu^3 ＋ was enhanced and the voltage character （relation between emission intensity and excitation voltage） was improved while the other properties of physics and chemistry were not changed. The origins of enhancement and improvement are discussed. Probably the distortion and the defect of crystals are decreased by the substitution of Gd^3＋ for Y^3＋ instead of Eu^3＋ for Y^3＋ , and thus the Eu^3＋ crystal field is improved, and radiationless process and energy loss resulted from crystal defect are weakened, which leads to increased luminescence intensity and voltage character improvement. The overlapping fluorescent spectra of Y2O2S： Sm^3＋ emission and Y2O2S：Eu^3＋ excitation as well as Eu^3 ＋ excitation spectra transitions spectra lead to energy transfer from Sm^3 ＋ sensitization of Sm^3＋ ions fectively. containing Sm^3＋ excitation the possibility of resonance ions to Eu^3＋ ions, and the to Eu^3＋ ions is achieved effectively.展开更多
The predominant linguistic thought in the West for the most part of the century has been one of separating language from its content. This line was pursued at first for the sake of securing a place for linguistics as ...The predominant linguistic thought in the West for the most part of the century has been one of separating language from its content. This line was pursued at first for the sake of securing a place for linguistics as an independent discipline. For Saussurc, language was no longer identified with thought, but linguistic system itself was understood as consisting of signs which are combinations of form and content. Under the strong influence展开更多
With the improved moving least-squares (IMLS) approximation, an orthogonal function system with a weight function is used as the basis function. The combination of the element-free Galerkin (EFG) method and the IMLS a...With the improved moving least-squares (IMLS) approximation, an orthogonal function system with a weight function is used as the basis function. The combination of the element-free Galerkin (EFG) method and the IMLS approximation leads to the development of the improved element-free Galerkin (IEFG) method. In this paper, the IEFG method is applied to study the partial differential equations that control the heat flow in three-dimensional space. With the IEFG technique, the Galerkin weak form is employed to develop the discretized system equations, and the penalty method is applied to impose the essential boundary conditions. The traditional difference method for two-point boundary value problems is selected for the time discretization. As the transient heat conduction equations and the boundary and initial conditions are time dependent, the scaling parameter, number of nodes and time step length are considered in a convergence study.展开更多
The moving least-square approximation is discussed first.Sometimes the method can form an ill-conditioned equation system,and thus the solution cannot be obtained correctly.A Hilbert space is presented on which an ort...The moving least-square approximation is discussed first.Sometimes the method can form an ill-conditioned equation system,and thus the solution cannot be obtained correctly.A Hilbert space is presented on which an orthogonal function system mixed a weight function is defined.Next the improved moving least-square approximation is discussed in detail.The improved method has higher computational efficiency and precision than the old method,and cannot form an ill-conditioned equation system.A boundary element-free method(BEFM)for elastodynamics problems is presented by combining the boundary integral equation method for elastodynamics and the improved moving least-square approximation.The boundary element-free method is a meshless method of boundary integral equation and is a direct numerical method compared with others,in which the basic unknowns are the real solutions of the nodal variables and the boundary conditions can be applied easily.The boundary element-free method has a higher computational efficiency and precision.In addition,the numerical procedure of the boundary element-free method for elastodynamics problems is presented in this paper.Finally,some numerical examples are given.展开更多
Based on the moving least-square(MLS)approximation,the complex variable moving least-square approximation(CVMLS)is discussed in this paper.The complex variable moving least-square approximation cannot form ill-conditi...Based on the moving least-square(MLS)approximation,the complex variable moving least-square approximation(CVMLS)is discussed in this paper.The complex variable moving least-square approximation cannot form ill-conditioned equations,and has greater precision and computational efficiency.Using the analytical solution near the tip of a crack,the trial functions in the complex variable moving least-square approxi-mation are extended,and the corresponding approximation function is obtained.And from the minimum potential energy principle,a complex variable meshless method for fracture problems is presented,and the formulae of the complex variable meshless method are obtained.The complex variable meshless method in this paper has greater precision and computational efficiency than the conventional meshless method.Some examples are given.展开更多
The paper begins by discussing the interpolating moving least-squares(IMLS)method.Then the formulae of the IMLS method obtained by Lancaster are revised.On the basis of the boundary element-free method(BEFM),combining...The paper begins by discussing the interpolating moving least-squares(IMLS)method.Then the formulae of the IMLS method obtained by Lancaster are revised.On the basis of the boundary element-free method(BEFM),combining the boundary integral equation method with the IMLS method improved in this paper,the interpolating boundary element-free method(IBEFM)for two-dimensional elasticity problems is presented,and the corresponding formulae of the IBEFM for two-dimensional elasticity problems are obtained.In the IMLS method in this paper,the shape function satisfies the property of Kroneckerδfunction,and then in the IBEFM the boundary conditions can be applied directly and easily.The IBEFM is a direct meshless boundary integral equation method in which the basic unknown quantity is the real solution to the nodal variables.Thus it gives a greater computational precision.Numerical examples are presented to demonstrate the method.展开更多
On the basis of reproducing kernel particle method(RKPM),using complex variable theory,the complex variable reproducing kernel particle method(CVRKPM)is discussed in this paper.The advantage of the CVRKPM is that the ...On the basis of reproducing kernel particle method(RKPM),using complex variable theory,the complex variable reproducing kernel particle method(CVRKPM)is discussed in this paper.The advantage of the CVRKPM is that the correction function of a two-dimensional problem is formed with one-dimensional basis function when the shape function is formed.Then the CVRKPM is applied to solve two-dimensional elasto-plasticity problems.The Galerkin weak form is employed to obtain the discretized system equation,the penalty method is used to apply the essential boundary conditions.And then,the CVRKPM for two-dimensional elasto-plasticity problems is formed,the corresponding formulae are obtained,and the Newton-Raphson method is used in the numerical implementation.Three numerical examples are given to show that this method in this paper is effective for elasto-plasticity analysis.展开更多
This paper presents an interpolating element-free Galerkin(IEFG) method for solving the two-dimensional(2D) elastic large deformation problems. By using the improved interpolating moving least-squares method to form s...This paper presents an interpolating element-free Galerkin(IEFG) method for solving the two-dimensional(2D) elastic large deformation problems. By using the improved interpolating moving least-squares method to form shape function, and using the Galerkin weak form of 2D elastic large deformation problems to obtain the discrete equations, we obtain the formulae of the IEFG method for 2D elastic large deformation problems. As the displacement boundary conditions can be applied directly, the IEFG method can acquire higher computational efficiency and accuracy than the traditional element-free Galerkin(EFG)method, which is based on the moving least-squares approximation and can not apply the displacement boundary conditions directly. To analyze the influences of node distribution, scale parameter of influence domain and the loading step on the numerical solutions of the IEFG method, three numerical examples are proposed. The IEFG method has almost the same high accuracy as the EFG method, and for some 2D elastic large deformation problems the IEFG method even has higher computational accuracy.展开更多
文摘目的探究干扰小RNA(si RNA)沉默小窝蛋白-1(CAV1)基因表达对人绒毛膜癌JEG-3细胞侵袭、迁移能力的影响及其可能的作用机制。方法将人绒毛膜癌JEG-3细胞分为对照组(不进行转染)、阴性组(转染si RNA-NC)和si RNA-CAV1组(转染si RNA-CAV1)。Transwell法检测下调CAV1表达对细胞侵袭、迁移能力的影响;实时定量PCR(q RT-PCR)检测转染细胞中CAV1 m RNA的表达水平;蛋白质印迹法(Western blot)检测细胞中CAV1、丝苏氨酸蛋白激酶(AKT)、雷帕霉素靶蛋白(MTOR)、核糖体p70S6激酶(p70S6K)、磷酸化AKT(p-AKT)、磷酸化MTOR(p-MTOR)、磷酸化p70S6K(p-p70S6K)蛋白的表达水平。结果 si RNA-CAV1组JEG-3细胞中CAV1 m RNA和蛋白的相对表达量均低于对照组(P﹤0.05);si RNA-CAV1组JEG-3细胞的侵袭数目、迁移数目均低于对照组(P﹤0.05);si RNA-CAV1组JEG-3细胞中AKT、MTOR、p70S6K以及磷酸化水平均低于对照组(P﹤0.05)。结论沉默CAV1表达可以抑制人绒毛膜癌JEG-3细胞的侵袭和迁移能力,该作用与AKT/MTOR/p70S6K信号通路有关。
文摘After trace Sm^3＋ ions and Gd^3＋ ions doping, the emission intensity of red phosphors Y2O2S： Eu^3 ＋ was enhanced and the voltage character （relation between emission intensity and excitation voltage） was improved while the other properties of physics and chemistry were not changed. The origins of enhancement and improvement are discussed. Probably the distortion and the defect of crystals are decreased by the substitution of Gd^3＋ for Y^3＋ instead of Eu^3＋ for Y^3＋ , and thus the Eu^3＋ crystal field is improved, and radiationless process and energy loss resulted from crystal defect are weakened, which leads to increased luminescence intensity and voltage character improvement. The overlapping fluorescent spectra of Y2O2S： Sm^3＋ emission and Y2O2S：Eu^3＋ excitation as well as Eu^3 ＋ excitation spectra transitions spectra lead to energy transfer from Sm^3 ＋ sensitization of Sm^3＋ ions fectively. containing Sm^3＋ excitation the possibility of resonance ions to Eu^3＋ ions, and the to Eu^3＋ ions is achieved effectively.
文摘The predominant linguistic thought in the West for the most part of the century has been one of separating language from its content. This line was pursued at first for the sake of securing a place for linguistics as an independent discipline. For Saussurc, language was no longer identified with thought, but linguistic system itself was understood as consisting of signs which are combinations of form and content. Under the strong influence
基金the National Natural Science Foundation of China (Grant No. 11171208)Shanghai Leading Academic Discipline Project (Grant No. S30106)
文摘With the improved moving least-squares (IMLS) approximation, an orthogonal function system with a weight function is used as the basis function. The combination of the element-free Galerkin (EFG) method and the IMLS approximation leads to the development of the improved element-free Galerkin (IEFG) method. In this paper, the IEFG method is applied to study the partial differential equations that control the heat flow in three-dimensional space. With the IEFG technique, the Galerkin weak form is employed to develop the discretized system equations, and the penalty method is applied to impose the essential boundary conditions. The traditional difference method for two-point boundary value problems is selected for the time discretization. As the transient heat conduction equations and the boundary and initial conditions are time dependent, the scaling parameter, number of nodes and time step length are considered in a convergence study.
基金supported by the National Natural Science Foundation of China(Grant No.10571118)the Shanghai Leading Academic Discipline Project(Grant No.Y0103).
文摘The moving least-square approximation is discussed first.Sometimes the method can form an ill-conditioned equation system,and thus the solution cannot be obtained correctly.A Hilbert space is presented on which an orthogonal function system mixed a weight function is defined.Next the improved moving least-square approximation is discussed in detail.The improved method has higher computational efficiency and precision than the old method,and cannot form an ill-conditioned equation system.A boundary element-free method(BEFM)for elastodynamics problems is presented by combining the boundary integral equation method for elastodynamics and the improved moving least-square approximation.The boundary element-free method is a meshless method of boundary integral equation and is a direct numerical method compared with others,in which the basic unknowns are the real solutions of the nodal variables and the boundary conditions can be applied easily.The boundary element-free method has a higher computational efficiency and precision.In addition,the numerical procedure of the boundary element-free method for elastodynamics problems is presented in this paper.Finally,some numerical examples are given.
文摘Based on the moving least-square(MLS)approximation,the complex variable moving least-square approximation(CVMLS)is discussed in this paper.The complex variable moving least-square approximation cannot form ill-conditioned equations,and has greater precision and computational efficiency.Using the analytical solution near the tip of a crack,the trial functions in the complex variable moving least-square approxi-mation are extended,and the corresponding approximation function is obtained.And from the minimum potential energy principle,a complex variable meshless method for fracture problems is presented,and the formulae of the complex variable meshless method are obtained.The complex variable meshless method in this paper has greater precision and computational efficiency than the conventional meshless method.Some examples are given.
基金supported by the National Natural Science Foundation of China(Grant No.10871124)the Innovation Program of Shanghai Municipal Education Commission(Grant No.09ZZ99)the ShanghaiLeading Academic Discipline Project(Grant No.J50103)
文摘The paper begins by discussing the interpolating moving least-squares(IMLS)method.Then the formulae of the IMLS method obtained by Lancaster are revised.On the basis of the boundary element-free method(BEFM),combining the boundary integral equation method with the IMLS method improved in this paper,the interpolating boundary element-free method(IBEFM)for two-dimensional elasticity problems is presented,and the corresponding formulae of the IBEFM for two-dimensional elasticity problems are obtained.In the IMLS method in this paper,the shape function satisfies the property of Kroneckerδfunction,and then in the IBEFM the boundary conditions can be applied directly and easily.The IBEFM is a direct meshless boundary integral equation method in which the basic unknown quantity is the real solution to the nodal variables.Thus it gives a greater computational precision.Numerical examples are presented to demonstrate the method.
基金supported by the National Natural Science Foundation of China(Grant Nos.10571118 and 10871124)Innovation Program of Shanghai Municipal Education Commission(Grant No.09ZZ99)
文摘On the basis of reproducing kernel particle method(RKPM),using complex variable theory,the complex variable reproducing kernel particle method(CVRKPM)is discussed in this paper.The advantage of the CVRKPM is that the correction function of a two-dimensional problem is formed with one-dimensional basis function when the shape function is formed.Then the CVRKPM is applied to solve two-dimensional elasto-plasticity problems.The Galerkin weak form is employed to obtain the discretized system equation,the penalty method is used to apply the essential boundary conditions.And then,the CVRKPM for two-dimensional elasto-plasticity problems is formed,the corresponding formulae are obtained,and the Newton-Raphson method is used in the numerical implementation.Three numerical examples are given to show that this method in this paper is effective for elasto-plasticity analysis.
基金supported by the National Natural Science Foundation of China (Grant No. 11571223)。
文摘This paper presents an interpolating element-free Galerkin(IEFG) method for solving the two-dimensional(2D) elastic large deformation problems. By using the improved interpolating moving least-squares method to form shape function, and using the Galerkin weak form of 2D elastic large deformation problems to obtain the discrete equations, we obtain the formulae of the IEFG method for 2D elastic large deformation problems. As the displacement boundary conditions can be applied directly, the IEFG method can acquire higher computational efficiency and accuracy than the traditional element-free Galerkin(EFG)method, which is based on the moving least-squares approximation and can not apply the displacement boundary conditions directly. To analyze the influences of node distribution, scale parameter of influence domain and the loading step on the numerical solutions of the IEFG method, three numerical examples are proposed. The IEFG method has almost the same high accuracy as the EFG method, and for some 2D elastic large deformation problems the IEFG method even has higher computational accuracy.
