误差常数

One bases on function value and another bases on arithmetic average difference quotient. In this paper, the author mainly studies the approximation properties of both the function value and the derivative of two kinds of splines interpolation mentioned before, and the optimal error constants are obtained finally.

文中分别就这两类插值样条的函数值及一阶导数的逼近性质展开讨论，相应得出这两种插值函数在被插函数分别为一阶连续可导和二阶连续可导情况下的最佳误差常数。

Simulation results show that, for the fixed sampling frequency, the error rises with the frequency increasing of periodic signal, and decreases with the attenuation time constant increasing of non-periodic signal. The sampling frequency determines the upper limit of appropriate frequency band directly. The research provides the basis for the selection of cutoff frequency in filter design.

仿真结果表明，在采样频率确定时，对于周期信号，计算误差随频率的增加而增大，而对于非周期信号，计算误差随衰减时间常数的增大而减小，采样频率大小决定了插值法用于分布参数模型的适用频带上限，该研究为滤波器设计中截止频率的选择提供了依据。

The paper discusses the theory of speed controlling after interpolating and how do the factor that mostly include cutting speed,time constant of speed controlling and vector angle of conterminous CNC segment affects arriving precision.

文章论述了后加减速的原理及进给速度、加减速时间常数、上下程序段之间的矢量夹角对轮廓误差的影响，给出了数据采样插补应用后加减速时依据矢量夹角控制轮廓误差的一种方法，并对矢量夹角的计算给出了详细解析。

These changes are mainly for the following reasons: With the Earth Observatory plate movement; Earth deformation; station plumb line changes; station external conditions, weather conditions change; instruments and observer error, as well as stars form stellar declination, on their own, the annual optical aberration constant and nutation constant errors.

这种变化主要由于以下几种原因：观测站随地球板块的运动；地球形变；测站铅垂线的变化；测站的外界条件、气候条件的变化；仪器和观测者的误差以及星表的恒星赤纬、自行、周年光行差常数和章动常数的误差。

The results are revealed that reading error of the thermocouple in the course of dynamic response is mainly ca...

结果显示：在动态响应过程中热电偶读数误差主要决定于热电偶测头以及热电偶隔热罩的辐射热损失，并且它的辐射热损失又受热电偶测头的滞后时间常数τ0 的限制；随着动态响应过程的进行，热电偶读数的误差急剧变化；当τ=3τ0时，基本上可以认为动态响应过程结束，但升温变化时误差更大。

Some valuable results are obtained in this dissertation, the most important are as follows:(1) The uncertainty in the determination of 〓Cs dc hyperfine polarizability constant κ is taken into account in the correction of blackbody ac Stark shift and it will bring out a fractional frequency uncertainty of about 4×10〓 to the correction.

本文还得到一些具有创新意义的研究结果，最主要的有：（1）我们首次考虑了直流极化率常数κ的测量误差对黑体辐射斯塔克频移修正误差的影响，经计算发现，由κ的测量误差导致的频移误差约为4×10〓，是黑体辐射斯塔克频移的主要误差来源。

In order to ensure the consistency of the closed-loop system performances, before the AFC is applied, a supervisory controller is used to drive initial tracking errors to a preset closed area, and then the AFC can drive the tracking errors of the closed-loop system to pre-specified neighborhood in the presence of unknown approximation errors of the fuzzy logic system.

为保证系统性能的一致性，在启动自适应模糊控制器前，采用监督控制将初始跟踪误差镇定到给定范围。自适应模糊控制器可在存在模糊逻辑系统逼近误差的情况下，使系统跟踪误差小于预先给定的任意常数。

A measurement method of the reflection coefficient of the radome electrical thickness has been introduced.

利用短路波导法测量了材料介电常数和损耗角正切，测量结果显示：介电常数测量的精度和稳定度较高，损耗正切的测量误差较大。

In order to resolve the problem of unconvenient to test and having high error rate during the time constant testing,a new test system of time constant for thermal detector is designed in this article.

为了解决目前热敏探测器时间常数测试中存在的测试不方便，测量误差大的问题，设计了一种新型的热敏探测器时间常数测试系统。

The measurement comprehensive precision evaluating formula considering the weight of baseline observation is put forward in the paper.By checking calculation and analysis,the views on those problems have been proved to be reasonable and representative,and it can be used to revise and to complete the corresponding standards.

其中的( 1 )和( 2 )类误差在仪器检测时表现为加、乘常数及其检测误差，它是文献［1，2，3］规定的必检项目，也是影响测距精度的主要误差源，因此必须对新的和使用中的EDM 的常数进行定期检测，并用检测值对距离观测值施加有效的改正，以保证和提高距离测量的精度。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。