误差

Retrace error of nonnull aspheric testing is analyzed in detail with conclusions that retrace error has much to do with the aperture, relative aperture and surface shape error of the apsheric under test.

分析了非球面非零位检测系统中的回程误差问题，得出了回程误差与被测非球面口径、相对口径以及非球面本身面形误差均紧密相关的结论。

The error is described by weighted average variance-covariance of root mean square error in curve normal direction, and error in the direction with maximum error respectively.

曲线上任意点的误差由端点及距离误差传播导出的误差之加权平均值的协方差表示。

As one key part, the effects caused by rounding error are analyzed mathematically and it is concluded that the effects can be degraded by an appropriate selection of coefficients in the iteration formula.

然后分析了该算法量化误差中的舍入误差所带来的影响，并提出该误差可以通过对迭代方程中的系数进行合适取值来降低。

This paper aims at the construction safety and work requirement of underground runnel, and integrates the new technology of modern engineering survey in order to discuss the shield tunnel survey and the underground deformation monitoring.

本文针对地铁隧道安全施工和运营需求，结合现代工程测量新技术，从理论和方法上探讨盾构隧道测量和地铁变形监测，介绍了盾构法地铁隧道贯通误差的分配特点，测距仪竖井高程传递的方法与中误差公式，推导了全站仪三维变形测量中自由设站法和附合导线法的相关误差方程式，提出了解决地铁隧道不均匀沉降的初步设想。

Estimation of parameters for general liner functional model with singular covariance. First, the Rao decomposition of the sample variance and the known singular measure error variance are presented and then the square measure error with singular variance and the standardized condition are got.

首先讨论了样本协方差与已知的奇异度量误差方差的Rao分解，给出了含有奇异方差广义逆的二次度量误差和模型的标准化条件，证明了二次度量误差与广义逆的选取无关。

H. Lan . The position control of electrohydraulic servomechanism via a novel variable structure control.

当误差较大时，控制系统的主要目的是尽快消除误差，此时误差的权重系数应取大些。

The phase mismatch error is the main error source of sound intensity measurement system.

相位失配误差是声强测量系统的主要误差源，仅靠提高仪器的精度很难消除这一误差。

The matter that statistical error produces is very complex, error sort is various, consequently, the control of statistical error is a very complex project.

统计误差产生的原因十分复杂，误差种类繁多，因而，统计误差的控制是一项非常复杂的工程。

To improve the pointing accuracy of the telescope mount and the capability of daylight tracking, it is necessary to do more study on the error of telescope axes. The present thesis analyses many kinds of factors that cause the pointing error of telescope mount, and discusses the method for correcting the pointing error by setting up telescope mount model in detail.

本文详细分析了望远镜机架指向产生偏差的各种因素，讨论了通过建立望远镜机架指向误差模型的方法来修正望远镜机架指向误差的方法，通过使用CCD观测恒星来求解望远镜机架指向误差模型参数。

About the theory of the model errors, there are many theoretical problems to be solved, and many disscusional fields to be expanded and perfected.

但是测量平差中的模型误差的理论还有许多问题有待完善、扩展、深入，如函数模型可扩展到附有条件模型、概括函数模型、非线性模型；随机模型可扩展到相关、秩亏等情况；误差理论可扩展到线性近似误差。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。