积分元

Its discretization is based on spectral elements in space and central differences method in time. The numerical result, shows that this approximation has spectral accuracy in space and up to second-order in time.

该解法引入一阶Clayton-Engquist-Majda吸收边界条件，在空间上利用谱元方法，在时间上利用中心差分的积分方法得到波动方程的离散形式，并给出具体算例进行了验证。

To avoid the trouble to construct the basis functions, we introduce a Lagrange multiplier into the variational formulation to replace the constraint condition for the basis.

本文采用同样的思路用Galerkin 边界元方法求解带有约束条件的与第一类Fredholm 间接边界积分方程等价的变分方程，为避免构造基函数时约束条件的限制，我们采用Lagrange 乘子法，把约束条件放入变分方程中去，形成扩展的变分方程，用线形单元离散后求解。

In order to loose therequirement of continuity as possible,study the construction mechanism andproperty of C1 continuity element,enlarge the constructing area of finiteelement,explore simpler,higher efficient element,based on the weak form ofthe domain equilibrium in this paper,obtains integral continuity condition,weak continuity condition gradually,enlarge the constructing area of finiteelement indeed,concludes that their average strains are identical.

为尽可能放松连续性要求、探讨C1连续有限元的构造机理和特性、扩大有限元的构造范围、寻求简单元高效的单元，本文从区域平衡的弱形式开始，逐步得出积分连续条件、弱连续条件，扩大了有限元的构造范围，得出其平均应变相等的结论。

In order to loose therequirement of continuity as possible, study the construCtion mechanism andpropedy of Cl cofltinuity element, enlnye the construCting area of finiteelement, explore simpler, higher efficient element, based on the weak form ofthe domain equilibrium in this paper, obtains integral continuity condition,weak continuity condition gradually enlarge the construCting area of finiteelement indeed, concludes that their average stralns are identical.

为尽可能放松连续性要求、探讨C_1连续有限元的构造机理和特性、扩大有限元的构造范围、寻求简单元高效的单元，本文从区域平衡的弱形式开始，逐步得出积分连续条件、弱连续条件，扩大了有限元的构造范围，得出其平均应变相等的结论。

The biggest advantage of this mean is that don"t need to computer the perturbation matrix element by using zero level wave function, even don"t need to give out high rank amendatory result using infinite series to sum like the ordinary perturbation theory. Thus, it not only avoids many complicated integral operation, but also obtains high rank amendatory result that it is very difficult to get or cant get.

这种方法最大的优点就是不需要用零级波函数来计算微扰矩阵元，更不需要像普通微扰论那样用无穷级数求和给出高阶修正的结果，这样一来，不仅避免了许多繁复的积分运算，而且求得了普通微扰论很难得到或不可能得到的高阶修正的结果。

In this paper , we consider the Expanded Mixed Finite Element Method and mixed covolume method for the quasilinear parabolic integro-differential equation and quasilinear parabolic problem.

本文中我们采用扩展混合有限元方法和混合体积元方法数值模拟了二阶拟线性抛物型积分微分方程和二阶拟线性抛物问题。

Especially for the problem of thin body, duple regularization of both the nearly singular integrals and ill-posed inverse problems is also successful in the two-dimensional boundary element method.

特 别对二维薄体位势边界元法，成功实现了几乎奇异积分和不适定反问题的双重正则化。

According to this model, the dimensionless velocity potential of the incident acoustic field,(where, F is the velocity potential, v 0 the velocity amplitude of the vibration source, k =2 p / l the wave number), can be expressed as an integral equation over the surface of the levitator emitter and reflector, and then solved by the boundary element method.

该模型将入射声场速度势 F 的无量纲形式，（ v 0是声源振动速度峰值， k =2 p / l 是波数），表达为发射端和反射端表面上的边界积分方程，并通过边界元方法求解。

Gen 8:1 And God remembered Noah, and every living thing, and all the cattle that was with him in the ark: and God made a wind to pass over the earth, and the waters asswaged

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Considering both the intrastrand and interstrand nearest-neighbor hoppings of sites, electronic transmission coefficient of DNA is calculated, which depends on energy and interstrand hopping integral.

考虑基元间最近邻的链内和链间跃迁，我们计算了DNA的电荷迁移率随能量和链间跃迁积分的变化。

This paper discusses design and realizable methods of remote test output interface from logical design angle.

本文从逻辑设计的角度讨论遥测输出接口的设计及实现方法。

This also 星体投射plies to buildings, structures and geological features.

这也适用于建筑物和地质特征。