均差

Our company is a private enterprise which was establised in 1998, specializing in manufacturing precise filters, automatic drainer, air pressure gauge and other purify equipment parts.Our products are precisely processed by CNC machinel lathe,thus about 99.9% of the products do reach the standard level requirement .

公司建于1998年，主要生产精密过滤器、自动排水器、压差表、压差器及其它净化设备配件，公司的产品均采用CNC数控车床进行精密机械加工，产品合格率达99.9%。

It adopts the variable step length scheme to evaluate at the connection point, and adopts the implicit difference scheme to evaluate in the same rod.

3运用在均质处采用隐式差分格式、节点处采用变步长的有限差分的混合方法求解抽油杆柱的波动方程。

This method adopts the variable step length scheme to evaluate at the connection point, and adopts the implicit difference scheme to evaluate in the same rod.

在进行数值求解时，在抽油杆柱均质杆段处采用隐式差分格式，而抽油杆柱在组合杆柱相邻联结点处则采用变步长的有限差分格式。

This thesis carries on research to a class of nonlinear Schrodinger Equation with wave operator of initial value periodic problem.

本文针对一维带波动算子的Schrodinger方程周期初值问题进行数值研究，对上述方程首先构造了守恒的半离散格式，然后将p次Hermite插值方法与有限差分方法相结合构造了差分正交样条配置格式，并证明这两个格式均为稳定和收敛的格式。

In this paper,a new control method with output voltage feedback and feedforward of voltage error between two input capacitor is presented.

该文提出对两个输入电容的压差进行检测，通过输出电压反馈和压差前馈方式实现均压的新控制方式。

Results show that radial basis function and point interpolation methods possess Kronecker Delta function property, but the robustness is poor in some cases; the MLS approximation function does not possess Kronecker Delta function property, but it has good robustness. Differences among the three discretization schemes of meshless method are as follows:the collocation method requires no numerical integration and very little computational time while its robustness is poor; Galerkin method is not a truly meshless method due to the background meshes required for integration; the Petrov-Galerkin method is a truly meshless method and need numerical integration in each sub-domain, so it needs more computational time.

分析结果显示：径向基函数和点插值法均具有d 函数属性，但计算稳定性差；移动最小二乘近似函数不具有d 函数属性，但计算比较稳定；无网格方法中的3种离散方法不同之处在于：配点法不需要积分，计算量小，计算稳定性差；Galerkin方法需要借助背景网格进行积分，它不是真正的无网格方法；Petrov-Galerkin方法，是一种真正的无网格方法，它需要对每个子域进行积分，计算工作量较大。

We chose Two way ANOVA to test whether mydriatic and different analyzing optical zones will lead the the root mean square and every type of aberrations of each order to show significant differences, in the mean time, we considered the interaction between mydriatic and its optical zones.

运用双因素方差分析方法研究各阶均方根(rootmeansquare，RMS)和各种类型像差在药物作用和分析瞳孔尺寸？饬礁鲆蛩赜跋煜碌谋浠欠窬哂邢灾？同时考虑二因素的交互作用。

The temperature gradient occurs imperatively and then influences to the image quality and resolution of the space camera. Based on the theory of optical wavefront error and combining the engineering practice, the thermal optical evaluation has been done to the optical window with non symmetric temperature field. The RMS wavefront errors of the optical window have been calculated on each typical position in orbit cycle.

文中结合工程实际，以光学波像差的基本理论为基础对空间相机光学窗口的非轴对称温度场进行了热光学评价，编程计算了空间相机光学窗口在一个轨道周期内各典型位置处的均方根波像差，并把计算结果与美国"天空实验室"光学窗口的相应数据进行比较，以验证本文热光学分析的合理性、正确性。

Sset future prices can be forecasted with filtering historical simulation by drawing from standardized residual density. The problem of inappropriate risk neutral assumption could be resolved by the calibration from density transformation. The transformation is to identify the state price density per unit probability through the parameter re-estimation by minimizing the mean squared error of market and model prices.

bstract：使用残差机率分配抽样的过滤历史模拟法可以作为未来资产价格的预测，而风险中立假设不适当的问题则可透过风险测度的转换予以解决，该转换过程系将市场价格与模型价格的均方差极小化求得估计校正后的新参数，作为状态价格机率分配的转换机制。

The induced changes in log mesopic contrast sensitivity showed significant negative correlation with the changes in third-order (r =-0.490, P =.0013 without glare; r =-0.362, P =.0177 with glare; Spearman rank correlation coefficient) and fourth-order root mean square (r =-0.586, P =.0001 and r =-0.306, P =.0450, respectively).

中间视力对比敏感度log值的变化与三阶像差(r =-0.490， P =。0013 无眩光； r =-0.362， P =。0177 ，有眩光； Spearman 等级相关系数)和四阶像差(r =-0.586， P =。0001无眩光；； r =-0.306， P =。0450有眩光，)的均方根呈显著负相关。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。