近似积分

词组短语

approximate integration

与近似积分相关的网络例句 [注：此内容来源于网络，仅供参考]

The basic idea is to set a continuous solution of the region with a finite number of discrete points instead of a grid consisting of, these discrete points called grid nodes the solution of a continuous area on a given function of continuous variables used in the definition of discrete grid variable function approximation the original equation and boundary conditions in the micro-business operators to approximate differential, integral with the points and to approximate, so the original differential equations and boundary conditions are replaced by algebraic equations near Side, that is, finite difference equations , solve this equation group can get the original problem in discrete points on the approximate solution.

基本思想是把连续的定解区域用有限个离散点构成的网格来代替，这些离散点称作网格的节点；把连续定解区域上的连续变量的函数用在网格上定义的离散变量函数来近似；把原方程和定解条件中的微商用差商来近似，积分用积分和来近似，于是原微分方程和定解条件就近似地代之以代数方程组，即有限差分方程组，解此方程组就可以得到原问题在离散点上的近似解。

This makes more and more people pay more attention to studies and applications of numerical simulation in thermal recovery. In this research, we have developed a reliable mathematical model for thermal recovery, which takes a full consideration of the effect of viscos, gravitical and capillary forces on the three-phase flow of gas, water and oil, the effect of the temperature on the medium characteristics of liquid and solid, the phase equilibrium of gas-liquid in each component, heat transportation including connection, conduction and radiation as well as heat losses in both the overburn and underlying strata. In the space discreation of the mathematical model, we have proposed a new method based on the improvement of the conventional nine-points difference approximation, which has a higher difference accurancy.

本项研究以热力采油的主要机理为基础，充分考虑在粘性力、重力和毛管力作用下油水气三相流动，考虑温度对各种流体和固体介质物性的影响，考虑每一组分中汽液两相的相平衡，考虑热在地层中的传导、对流和辐射以及上下盖层的热损失，利用热力学第一定律、质量守恒定律和流体迁移定律，建立了正确可靠的注蒸汽数学模型；在对数学模型进行空间离散时，利用控制有限体积积分法，对以往的九点差分近似作了合理的改进，使其具有较高的差分近似精度：结果表明，该公式的近似精度要比以往文献中所给的九点差分近似精度高，可以认为，在油藏数值模拟中，如果遇到非均质情况，使用这种九点差分近似更合理。

The second kind of Fredholm integral equation of the single pile in layered saturated viscoelastic soil is obtained through the fundamental solutions.

然后对所得的积分方程进行Laplace变换，得到变换域内的积分方程，对变换域内的积分方程采用Schapery逆变换方法得到时域内水平单桩的近似积分方程。

The characteristic of this method lies in transforming improper integral into the usual one. Thus various kinds of usual approximate integrals can be used, and the observed data may be calculated directly and conveniently to obtain necessary numerical accuracy.

该方法的特点是把Abel变换的广义积分变化成通常的积分，这样就能够使用各种通常的近似积分公式直接从实验数据计算到所要求的数据精度。

Integral of one variable functions, improper integral and its convergence properties.

本课程的主要内容包括：1 各种极限运算，其中包括数列极限、函数极限以及上、下极限；2 一元函数的微分学，包括微分和导数的运算法则、微分中值定理及其应用等；3 一元函数的积分和广义积分及其收敛性；4 级数及其收敛性，包括数值级数的收敛性和函数项级数的各种运算和性质；5 多元函数的微分学及其应用，其中很多方面与一元函数的微分学近似，需要注意它们之间的区别；6 多元函数的积分学，包括多重积分的性质与计算，多重积分的的应用等；7 曲线、曲面积分及其应用；8 含参变量积分的计算与性质；9 Fourier 级数及其应用，等等。

Furthermore, by using the corresponding inverse Laplace integral transform and numerical solution of integral equation, the displacement and axial force as well as the shear stress of the pile are obtained.

对变换域内的积分方程采用Schapery逆变换方法得到时域内单桩的近似积分方程。数值求解所得的积分方程可以得到桩的沉降、轴力、剪力和孔压。

The non symmetric vibrating character of shaking table is an important factor influencing on shaking table separation and is also the main basis for determining correctly the parameters of shaking table .

针对这一问题，根据实测的摇床振动位移曲线，利用频率分析法和近似积分的原理，采用 E1、E2和 C参数的差动特性系数对摇床差动特性进行了综合评定。

It is derived by the origins of numerical approximation integration and introduces some important methods of numerical integration in detail in the dissertation.

本文从数值近似积分问题的产生出发，详细介绍了一些数值积分的重要方法。

More than 30 kinds of meshfree methods are reviewed in this paper in the light of weighted residual method, and different meshfree methods can be viewed as different forms of weighted residual method and/or with different approximation functions. Various kinds of meshfree approximate schemes are presented in detail, including moving least square approximation, kernel and reproducing kernel approximation, partition of unity approximation, radial basis approximation, radial point interpolation and natural neighbor interpolation.

详尽介绍了各种无网格近似方案(包括移动最小二乘近似、核近似和重构核近似、单位分解近似、径向基函数近似、点插值近似、自然邻接点插值近似等)和无网格法中常用的各类加权余量法(伽辽金格式、配点格式、局部弱形式、加权最小二乘格式和边界积分格式等)，并讨论了数值积分方法和边界条件的处理等问题。

Based on the mean spherical approximation integral equation theory, perturbation theory and group contribution concept, a new molecular thermodynamic model was established for the representation of activity coefficient of solvent in the IL-containing systems.

利用平均球近似积分方程理论、微扰理论以及基团贡献的基本思想，本文建立了一个适用于含离子液体体系中溶剂活度系数计算的新的分子热力学模型。

与近似积分相关的网络解释 [注：此内容来源于网络，仅供参考]

integral algebroidal function：整代数体函数

integral algebraic number 代数整数 | integral algebroidal function 整代数体函数 | integral approach 积分近似=>積分法

approximate formula：近似公式, 近真公式

approximate field pattern | 近似场图 | approximate formula | 近似公式, 近真公式 | approximate integration | 近似积分(法)

approximate integration：近似积分

approximate formula 近似公式 | approximate integration 近似积分 | approximate limit 近似极限

approximate integration：近似积分(法)

approximate formula | 近似公式, 近真公式 | approximate integration | 近似积分(法) | approximate kernels | 近似核

integral square error approximation：积分平方误差近似

integral square error 平方误差积分=>平方誤差積分 | integral square error approximation 积分平方误差近似 | integral square error criterion 误差平方积分准则

backward difference method：后向差分法

在求解温度场时,采用后向差分法(backward difference method)对时间积分,此方法把热流动速度利用一次方的近似法来模拟. 而在弹塑性分析中,处理应力时,使用修正型牛顿-拉福森法为基础的增量解法,同时在应力增量-应变增量的关系式中,

Solution for exact determined equations：精确确定的方程的解

Integral equations 积分方程 | Solution for exact determined equations 精确确定的方程的解 | Solution for approximately determined equations 近似确定的方程的解

kernel function：核函数

它将描述场的函数用"核函数(kernel function)逼近"近似表达为任意函数和核函数的乘积的积分(实质为将某一点的属性用另一区域的属性来描述,核函数建立这两者之间的关联),然后作"质点逼近",用一系列粒子将这个场离散化(即积分式的级数表达).

Simpson：辛普逊

2、按辛普逊(Simpson)近似积分公式计算 Q 值. 二、数学模型:1、水蒸汽饱和蒸汽压力采用 Wexier 和 Greenspan 公式公式形式为:一、程序功能、本程序适用于719机,能对各种类型的冷却塔进行热力计算. 、按辛普逊(Simpson)近似积分公式计算皿值.

variational method：变分法

为适应复杂几何形状及提高求解效率精度等问题,利用变分法(Variational Method)或加权余差函数法(Weighted residual method)把2阶微分方程按分部积分变为积分方程而求取2阶偏微分方程的弱形式的近似解,发展为有限元法.