近似误差

The formula calculating the first frequence of the bridge with the pile foundation is derived by using the Rayleigh Principle.

用Rayleigh法推导了桩基桥梁的第一自振频率的近似计算公式；在动力学效的原则下建立了桩—上—上部结构体系的等代简化模型，导出了动力等效嵌固深度l〓的计算公式，并与静力等效嵌固长度Z〓的计算公式进行对比分析，给出了静力公式的误差范围。

The improvements in the IAGA contained adding strengthen operator, improving evaluation index of premature, etc. Multi-phase homing project, making use of the flight properties of parafoil system in gliding and turning, was simple in control and facile in practice. Based on Frenet frame, the linear time-variable error equations of parafoil system were built.

基于Frenet坐标系推导和建立了翼伞系统线性时不变的误差方程，并运用&投影点&的思想来获得Frenet坐标系下偏差量的解析近似表达式，从而设计了用于翼伞系统航迹跟踪的传统PD控制器和增益调节型模糊PD控制器。

Both of the two-stream schemes are very accurate in clear sky conditions, with an error in heating rate of less than 0.4K/day.

对于真实大气，晴空时，两种二流近似方法都比较准确，加热率的误差小于0.4 K/day。

Finally, we establish rational spectral formation of discrete with regard to time and space, and gained the error estimate in the finite-time in the abstract.

最后，我们构造了同时关于时间空间方向离散的谱格式，并从理论上建立了在有限时间上的全离散格式近似解的误差估计。

According to the post-tensioning method in prestressed concrete members,the calculation method of prestress losses caused by the deformation anchorage device,slip of tendon and joint compression was big in the error and narrow in the scope of application.

针对后张法预应力混凝土构件中由锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算方法适用范围较窄和误差较大的缺点，基于变形协调条件，通过分段近似计算方法，建立了锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算公式，并与实际预应力混凝土T形截面简支梁的计算结果进行了比较。

They are differentiated twice with approximate ideal differentiators to obtain the corrected accelerogram.

本文通过对数字强震仪系统使用的力平衡加速度计的仪器响应误差进行分析，提出了一个校正仪器响应失真的处理方法，即对未校正记录做低通滤波后运用近似理想微分器做两次微分得到校正加速度记录。

The correct coefficient of temperature difference can be taken as one, when this method is used to calculate the heat transfer coefficients of shield section.

结果表明，CRK法的计算误差小于传统计算方法，在进行遮蔽段传热计算时，错流温差校正系数可近似按l处理。

They are derived in a cl...

在所有的情况下，近似解的最大误差均小于2～3米。

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。