函数变量

In a'variable structure system', the control law is a discontinuous function of the state variables when the trajectory crosses a prescribed hypersurface in the state space.

在一个变结构系统中，控制律是当状态轨迹经过规定的超平面时状态变量的不连续函数。

Wang and VanRzin presents a class of smooth weight function estimators for discrete distribution.

Wang和VanRzin提出了离散分布随机变量的光滑权函数的估计类。

Tension of cables belongs to the optimization problem of discrete variable therefore the object function can not be explicit expressed. To solve this problem, the genetic algorithm was applied in optimizing calculation.

索张拉属于离散变量的优化问题，且目标函数无法形成显式，本文将遗传算法引入到优化计算中，解决了这一难题。

The stability of the established discriminant function and the reliability of the results of the evaluation were enhanced.

对实例评价结果表明：通过筛选引入判别方程变量的后验概率均达到90%以上，对判别分类有显著影响，从而提高了所建立的判别函数的稳定性和评价结果的可靠性。

The performance function was decomposed into disjoint sets of variables to address the combinatorial explosion challenge caused by configuration variations.

该方法通过將性能函数分解为互不相交的变量子集，解决了因配置多样性產生的组合问题。

We use the Taylor series expansion method to get the second-order approximate expression of the confidence region of the parameters, and then according to the principle of minimizing the volume of the confidence region, this paper carries out experimental design for the regression model, and then fixes the point range in the domain of definition of design variable for the model function so as to select the designing point, which can minimize the volume of the confidence region.

文章首先计算指数族非线性模型的回归参数β在1-α置信水平下的置信域的体积，为了便于计算，需把置信域投影到切空间中去，投影后的置信域是一个椭球体，用Taylor展开方法对此椭球体的体积进行二阶近似，推出原参数置信域的体积的近似表达式，然后对回归模型进行试验设计，根据置信域体积最小准则，在模型函数的设计变量的定义域上确定点列，选取使置信域体积达到最小的设计点。

PartⅡ,Applying the developed and extended direct algebraic methods that presented in recent years and based on the 2+1 dimensional variable separation solutions,abundant Jacobi elliptic function doubly periodic waves and periodic propagating wave patterns for many 2+1 dimensional nonlinear wave models are obtained,and in long wave limit solitary waves are derived as well.

第二部分，本文拓展和推广(来源：a2AB7aC论文网www.abclunwen.com)了新近发展的几种典型的直接代数方法和基于分离变量解的间接方法，获得多个2+1维非线性波动模型丰富的雅克比椭圆函数双周期波解和周期传播波模式，并得到长波极限情形下存在的非线性孤立波。

Utilizing plane sectorial domain Hamilton system function via variable substitutes and eigenfunction expansion method, an analytical element is proposed in this paper for the crack analysis of reinforced concrete structures combining the bridging model and Dugdale model. Combined with finite element, nolinear crack problems of reinforced concrete structure can be analyzed.

利用平面扇形域哈密顿体系方程，通过分离变量法及共轭辛本征函数向量展开法，结合Dugdale模型和桥联力模型，推导了钢筋混凝土结构裂纹尖端的解析元列式，将此解析元与普通有限元结合，可用于分析钢筋混凝土的非线性断裂问题。

anisotropic medium, elliptic cylinder, scattering, mathieu functions, elliptic coordinates, dynamic stress concentration factor

本文利用椭圆坐标中的变量分离方法，由Mathieu函数给出了各向异性介质中椭圆柱面对SH波散射

Implying a multivariate equality constraint in switching function, a genetic algorithm based improved mathematical model for fault location of distribution network is built.

将一个多变量等式约束条件隐含于开关函数中，基于遗传算法建立了改进的配电网故障定位数学模型。

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。