查询词典 integral element

This paper stressed on the fact that electric displacement vector is a supplementary physical element,focused on a difference between D and D surface integral and on the condition of D=ε_0E_0 existence,and made a comprehensive and correct understanding for beginner.

着重说明了电位移矢量D是一个辅助物理量，强调指出D与D的面积分的意义不同，以及D=ε0E0成立的条件，从而使初学者对D建立起一个全面和正确的认识。

This article employs the method of element changing in definite integral to spread the dimension formula of plane figures .

利用定积分的换元法，推广了平面图形的面积公

The complex variable boundary element-free method is a direct numerical method of the meshless method of boundary integral equation.

复变量边界无单元法是边界积分方程的无网格方法的直接列式法，容易引入边界条件，且具有更高的精度。

For the diffractive optical element realizing beam shaping in the fractional Fourier transform domain,the transform matrix calculated by the discrete sampling points was compared with that calculated by the Fresnel integral,and the discretization error of the intensity distribution on the output plane was qualitatively obtained.

针对分数傅里叶变换衍射光学光束整形器件，比较了按离散点与按菲涅耳积分计算得到的变换矩阵间的差距，从中分析得出按离散点计算的变换矩阵引入的离散化误差与分数傅里叶变换系统参数的关系。

The beamforming is an important measure of the orientation estimation in theunderwater sound positioning. The Generalized Correlation Beamformer isstudied and the algorithms of FIM and WFIM(WeightedFourier Integral Method) are given. In most circumstances, the performance of these two algorithms is better than Delay-Sum Beamformer. The MVDR(MinimumVariance Distortionless Response) adaptive beamformers are investigated in element andbeam domain. The research results show that the beam-domain MVDR algorithm notonly increases the resolution, but also saves computer when using it to aim orientationestimation.

4水下声定位中波束形成技术是方位估计的重要手段，重点研究了广义相关波束形成算法傅氏积分方法(FIM和加权傅氏积分方法，大多情况下FIM、WFIM算法的性能优于时延—求和波束形成；研究了阵元域和波束域MVDR自适应波束形成，结果表明，利用波束域MVDR进行目标方位估计，既可以获得高精度的方位估计，又可以大大减少计算量。

The paper mainly discusses the distinguishing usage of the isoparamentric transformation idea to deal with complicated physiological structure, such method as fibrous finite element division, material parameter transformation concerned non-homogeneity, numerical integral with multi-layered composite, and inverse mapping considered complex boundary condition and loads.

本文主要介绍了等参变换思想、方法在建模分析中的特色应用，如基于纤维结构的等参有限单元离散、考虑非均匀性的材料参数等参变换、层和数值积分和考虑复杂边界条件及负载特性的逆变换等均是运用等参变换的思路来处理复杂的生理结构问题。

Initial boundary value problem of two dimensional unsteady diffusion equations is solved in this paper. By using time-dependent fundamental solution of two dimensional diffusion equations and the extension of double layer potential, we establish virtual boundary integral expression of diffusion equations. Then virtual boundary element method is used to implement the numerical computation.

本文在求解二维非定常扩散方程的初边值问题时，利用二维扩散方程与时间有关的基本解，基于双层位势的延拓，建立二维扩散方程的虚边界积分表达式，然后利用虚边界元法进行数值计算。

The meshless local Petrov-Galerkin method is a new numerical technique presented in recent years, for it doesn't need any element or mesh for the energy integral or the purpose of interpolation, and it's termed as a truly meshless method.

无网格局部Petrov-Galerkin方法是近几年发展起来的一种相对较新的数值方法，它不需要借助任何的单元或网格来进行积分或插值，是一种真正的无网格方法。

The meshless local Petrov-Galerkin method is a new numerical technique presented in recent years. It doesn't need any element or mesh for the energy integral or the purpose of interpolation. Therefore it is a truly meshless method.

无网格局部Petrov-Galerkin方法是近几年发展起来的一种无网格方法，它不需要借助任何单元或网格进行积分和插值，是一种真正的无网格方法。

In the last chap-ter,the natural integral equation and natural boundary element method forharmonic problem on exterior elliptic domain are introduced.Then,based onthis,the natural boundary reduction method for a kind of exterior problem ofanisotropic constant coefficients elliptic equation is discussed, the natural inte-gral equation and its solving method on circular boundary and elliptic bound-ary are obtained.These results can be directly applied in coupled methodand DDM for exterior boundary value problem.

最后，讨论了椭圆外区域调和问题的自然积分算子即D-N算子及自然边界元方法，并基于此研究了一类各向异性常系数椭圆型方程外问题的自然边界归化方法，首次得到其在圆周边界及椭圆边界上的自然积分方程及其求解方法，并将这些结果直接应用于外边值问题的耦合算法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。