扰动

To weaken the influences of the position-dependent periodic disturbances and parameter uncertainties, the robust repetitive controller was designed, which associated structure singular value theory with the discrete-time repetitive control theory. The problem of robust repetitive control was transformed into one of H∞ optimal control using linear fractional transformation. The robust repetitive controller was achieved using D-K iteration procedure and made the servo system have stability, robustness and tracking performance.

为了削弱周期性扰动及参数变化不确定性的影响，将重复控制和结构奇异值理论相结合，利用线性分式变换(linear fractional transformation，LFT)将鲁棒重复控制问题转换成H∞最优控制问题，采用D-K迭代法设计鲁棒重复控制器(robust repetitive controller，RRC)，实现系统的稳定性和鲁棒性，提高系统的跟踪特性。

Linear model ; measure ; perturbation ; curvature / local influence analysis

线性模型；度量；扰动；曲率／局部影响分析

In chapter 2, the effects of the linewidth, spectral distribution and amplitude-or phasemodulation of the light-source are analyzed in detail.

对腔的损耗、入射光频宽和扰动影响大小作了分析比较，并给出这一分析的定量表达式。

The results show that,the influence of parameter variations of natural gas on the whole liquefaction system of perturbations is little.

原料天然气的各项参数发生变化时，所产生的扰动对整个液化系统的影响较小。

Therefore, compared to the case without spiral arm perturbation, the curve F∝ log M, which is a measure of the formation rate of more massive clouds in the whole disk, is just displaced upwards and the amount of GMCs with intermediate mass, i.e., those with mass in the range between 10 5 and 10 6 M ⊙, will hardly be affected.

因此在整个星系盘上，与没有旋臂扰动情况相比，F∝logM的曲线只是相应地往上有一平移，而对形成的中间质量的巨分子云的数量基本没有影响

The paper provides a new dimension-reduced method of sensitivity analysis for stochastic user equilibrium assignment model based on the relation between its Lagrange function and logarithmic barrier function combined with a Courant quadratic penalty term. The advantage of this method is of smaller dimension than general sensitivity analysis and reducing the complexity.

基于随机用户平衡分配扰动模型的Lagrange函数及带柯朗二次惩罚项的对数边际函数之间的关系给出了一种的新的降维灵敏度分析方法，与通常所说的灵敏度分析相比它的优点是大大减小了计算的维数，降低了复杂性。

Feedforward control of the disturbance Looper than good feedback.

前馈控制对活套的扰动比反馈好。

The vertical distribution of the low-frequency coastal flow is related to disturbing factors.

低频流的垂直分布和扰动因子有关。

In order to effectively decrease integral saturation, lower down the sensitivity to noise, make the piezoelectric micro motion worktable response quickly with small overshoot and get high accuracy under control system, the control arithmetic with feed-forward compensated integral and weighted differentiated PID has been created.

为有效地减小积分饱和并降低对扰动的敏感性，使压电微动工作台在控制系统的作用下，响应快，超调小，稳态精度高，构造了一种带有迟滞非线性模型前馈补偿的弱积分与加权微分PID控制算法。

Luzon Strait is the region where the perturbation energy increases and the frontal instability is especially active.

作为西边界的豁口的吕宋海峡是扰动能量增长的区域，尤其是锋面不稳定活跃的区间。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。