系统误差

Simulation results show that the system has better control performance and estimation effect , but the influence of parameters variation on speed estimation error is evident .

仿真结果表明该系统有较好的控制性能和辨识效果，但参数变化对速度辨识误差有明显的影响。

Basing on the analysis of Park model and the vector diagram of hydro generator and taking its actual wiring in the power system into account,this paper develop an accurate method—Newton analytical method,to calculate the static stability boundary condition.

本文通过对水轮发电机派克方程和矢量图的分析，并考虑其在电力系统中的实际联结情况，建立一种精确的水轮发电机静态稳定边界计算方法———牛顿解析法，用此方法对多台机组静态稳定边界点所有参数的计算结果与试验实测值进行比较，误差很小，达到了足够的准确度。

The paper reviews the various techniques commonly used in the kinetic measurement for metal hydrides,including volumetric method and thermal analysis method.

本文概述了测定金属氢化物反应动力学常用的各种实验技术，包括定容法和热分析法等，分析了不同实验系统测量误差的产生和消除，总结了各种技术的特点和不足，并对新技术的发展趋势进行了展望。

This paper systematically researched this sort of nonuniformly sampled signals'digital spectrum structure, signal-to-noise ratio , the response of D/A converter with nonuniformly sampled signals, the algorithm for estimating timing offsets, the relationship between the discrete time expression of the total energy and the continuous time expression, the estimation of the average power, the algorithm of recovery and application in designing and analyzing the digital waveform synthesizer.

本文全面系统地研究了这类周期性非均匀采样信号的数字谱结构，信噪比表达式，数模转换器对非均匀采样信号输入的响应，误差校正算法，时域与频域的能量对应关系，对功率测量的影响，内插恢复算法，以及在设计和分析数字波形合成器中的应用。

According to this result, an optimal procedure can be employed to determine these parameters in the kinematic design of PKM, which enable the desired ratio of workspace volume, well-conditioned dexterity, and desired velocity capability to be simultaneously achieved without occurrence of strut interference.

本文以基于6-TPS Stewart平台的并联机床为研究对象，研究了该类机床数控系统中有关运动控制的一些关键问题，并针对在运动控制中引发的微分运动分析与综合、解轨迹上的非线性特性及其引起的插补原理性误差等并联机床的运动学性能问题进行了研究。

Zero phase error tracking control method can improve the tracking performance of servo system, but there still exists problems such as weak robustness and gain error.

零相差跟踪控制方法可以提高伺服系统跟踪性能，但仍存在鲁棒性不强和增益误差的间题。

The zoom lens of this system has been introduced, and measure error has been discussed in detail.

本文详细介绍了该系统的微距摄影测量型电动变焦镜头，并对测量误差进行了分析。

Thus,the methods of error correction and mathematical treatment for two alveoli levels detection data were presented.

针对在水平仪检测数据订正与数学处理方法方面出现的问题，分别提出了对这2种气泡水平仪系统读数误差的确定方法和检测数据的数学处理方法。

There are no distinct differences between ancestral character state and descendant character state in some characters. 4. Only one outgroup can't give enough information to tell what the ancestor looks like. It make us not to understand how a lot of charactors evolved. 5. The matsutake group is polyphyletic. 6. The character coding is not precise enough. 7. Some characters are not homology. The result of molecular systematic study on the matstuake group shows the group is not monophyletic. The matsutake group is more closed to Tricholoma than Armillaria. ITS sequence of Catathelasma ventricosum is nearly identical to that of the matsutake group, although apparently they are very different from each other in morphological characters.

对松口蘑群通过形态学特征进行系统发育关系分析造成很大的干扰的原因有：松口蘑的种类大多形态特征比较简单，可提供进行分析的特征不多；某些性状在一些状态之间的反复转化，造成分析上的误差；在进化过程中某些性状无明显的祖征和衍征，在分析过程中很难确定进化极性；选择外群时应该用一个特定类群进行整体理解后，确定各个性状的极性，不要只用单种作为外群；松口蘑群是一个多系群；进行比较的性状不一定是同源的；数量性状编码过于粗放，反映不出真实的情况。

On the other hand, the dynamics in the mean motion resonances in the main asteroidal belt (the Kirkwood gaps and also accumulations of asteroids in definite region) is still not well understood.

而我们之所以选择映射方法是因为映射方法与解析计算和直接数值积分相比，有着速度快、无积累误差、理论分析简单等优点，适于研究动力系统的长期演化问题。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。