近似误差

In wood industry,based on massy experimental data or approximately mathematical models,single planar capacitance sensors have been used for measuring wood moisture content and are consequently difficult to error analysis and control.

在木材工业中，木材含水率检测应用的单一平面电容传感器都是采用大量实验或近似数学模型实现检测的，难以控制和分析误差。

The transition matrix analytic solution of perturbation equations which was widely used in inertial guidance engineering are derived.

忽略数学模型的细节所招致的最大误差小于0.1%。在此基础上得到引力异常造成落点偏差的近似解。

It consists of analysising the ill-posed property by means of Fourier Transform,geting its stable solution through constructing the Mollificator and offering the error estimate of the Mollification solutio...

包括以Fourier变换为工具分析其不适定性，通过构造缓镇子获得其稳定的近似解，并给出了缓镇解的误差估计及数值实现过程。

The approximate solutions have advantages of simplicity,practicality,and higher accuracy,which is of practical value in calculating nonlinear oscillations .

利用线化和校正法所求得的近似解与数值解比较，具有简单实用、精度高、相对误差低等优点，在求解非线性振动中具有一定的实用价值。

The question of searching characteristic points or straight lines on moving rigid body is decomposed into two relatively independent sub-questions. The first one is to evaluate the characteristic of points and straight lines on moving rigid body, whose mathematics model is a kind of special non-differential max-mini optimal problem with inequality constraints. By the method of Saddle-point Programming and maximum entropy, the problem can be transformed as a differential optimal problem with single objective. The second oner is to search approximative character points or straight lines on moving rigid body within design space, whose mathematic model is nonlinear and non-differential problem with multiple constraints.

本文将在运动刚体上寻找特征点或直线的优化问题分解为两个相对独立的子问题，一是对运动刚体上点或直线的特征性评定，其实质是平面曲线的圆度或直线度的评定问题，优化模型是以最大误差为最小作为优化目标的约束不可微的优化问题，本文采用鞍点规划和极大熵方法，将其转化为单目标可微优化模型；二是在设计空间内，寻找运动刚体上特征性评定指标最小的近似特征点或直线，其优化模型是非线性、多约束的不可微优化问题，本文提出用遗传算法和BFGS局部搜索法相结合来求解。

To reduce the error between the interpolation function regaining the sampled signal and interpolation function ha by Shannon sampling theorem, this paper suggests that the common linear interpolation is replaced by a second order approximation of the parabolic interpolation.

为减小恢复被采信号所用的内插函数与山农采样定理要求的内插函数ha之间的误差，提出了用抛物线内插--ha的二阶近似代替常规的线性内插。

In this paper, based on the 1st order Taylor's expansion approximation interpolation, a realtime parametric curve interpolation algorithm is proposed in this paper, which can automatically adjust feedrate to confine the contour error within a given tolerance.

本文在一阶泰勒展开近似插补方法的基础上，给出了一种能够自动调整进给速度，将轮廓误差限定在允许范围之内的参数曲线的实时插补方法。

The polynomial truncation criterion is given to judge the error for the polynomial approximation.

提出对于NARLMA模型的神经网络结构进行多项式展开以实现系统的逐次分析，给出多项式截断准则，判定多项式近似的误差。

We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.

讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。

Nevertheless, FDTD algorithm is implemented in rectangular mesh of Cartesian coordinates system. The curved boundaries must be approximated by staircases.

然而，FDTD算法是在直角坐标系的Yee网格下展开的，对弯曲界面只能用阶梯近似，从而带来很大误差。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。