This paper presents a curvilinear boundary quadrilateral element for the problem of thin plate of bending with curvilinear boundary. A coordinate transformation of two dimensions is performed in the calculation of FEM...This paper presents a curvilinear boundary quadrilateral element for the problem of thin plate of bending with curvilinear boundary. A coordinate transformation of two dimensions is performed in the calculation of FEM. The introduction of an additional stiffness matrix based on the generalized variational principles results in high accuracy and less computation time. The numerical results agree with the analytical solution very well.展开更多
According to Ref.[1],four kinds of new magnet-sensitive solid-state transducers have been developed with new elements (magnetic diode couple and magnetic transistor). They are (1) single magnetic transistor transducer...According to Ref.[1],four kinds of new magnet-sensitive solid-state transducers have been developed with new elements (magnetic diode couple and magnetic transistor). They are (1) single magnetic transistor transducer,(2) magnetic diode couple transducer, (3) magnetic diode and magnetic transistor combined transducer and (4) bridge circuit of double magnetic diode couple transducer.Their practical circuits are introduced in this paper.Their performances are tested experimentally and compared in the form of experimental curves and empirical formulas.These four transducers are superior to the transducers given in Ref.[4-7] in multifunction and universality,especially in the ability to measure very low speed.展开更多
This paper presents a posteriori residual error estimator for the new mixed el-ement scheme for second order elliptic problem on anisotropic meshes. The reliability and efficiency of our estimator are established with...This paper presents a posteriori residual error estimator for the new mixed el-ement scheme for second order elliptic problem on anisotropic meshes. The reliability and efficiency of our estimator are established without any regularity assumption on the mesh.展开更多
Based on an improved orthogonal expansion in an element, a new error expression of n-degree finite element approximation uh to two-point boundary value problem is derived, and then superconvergence of two order for bo...Based on an improved orthogonal expansion in an element, a new error expression of n-degree finite element approximation uh to two-point boundary value problem is derived, and then superconvergence of two order for both function and derivatives are obtained.展开更多
文摘This paper presents a curvilinear boundary quadrilateral element for the problem of thin plate of bending with curvilinear boundary. A coordinate transformation of two dimensions is performed in the calculation of FEM. The introduction of an additional stiffness matrix based on the generalized variational principles results in high accuracy and less computation time. The numerical results agree with the analytical solution very well.
文摘According to Ref.[1],four kinds of new magnet-sensitive solid-state transducers have been developed with new elements (magnetic diode couple and magnetic transistor). They are (1) single magnetic transistor transducer,(2) magnetic diode couple transducer, (3) magnetic diode and magnetic transistor combined transducer and (4) bridge circuit of double magnetic diode couple transducer.Their practical circuits are introduced in this paper.Their performances are tested experimentally and compared in the form of experimental curves and empirical formulas.These four transducers are superior to the transducers given in Ref.[4-7] in multifunction and universality,especially in the ability to measure very low speed.
文摘This paper presents a posteriori residual error estimator for the new mixed el-ement scheme for second order elliptic problem on anisotropic meshes. The reliability and efficiency of our estimator are established without any regularity assumption on the mesh.
基金This work was supported by The Special Funds for State Major Basic Research Projects(No. G1999032804)The National Natural Science Foundation of China(Grant No.10471038)
文摘Based on an improved orthogonal expansion in an element, a new error expression of n-degree finite element approximation uh to two-point boundary value problem is derived, and then superconvergence of two order for both function and derivatives are obtained.
