扰动

Numerical results of the energy, the velocity distribution, the mean free path, the mean collision time, the heat capacity and the self-diffusion coefficient agree well with the theoretical/experimental data.

本文用分子动力学方法模拟了系统的热力学参数和输运系数，并探讨了扰动在介质中的传播机理，最后分析和讨论了汽液界面中的相变现象。

For pratical reasons, the method of increasing the number of iteration m so as to enhance the security can only be used in the case that parameters can match exactly, like a digital encryption system.

本文对以上的离散实际混沌加密系统采用多精度自扰动的离散化策略，从而避免了传统的离散化方法所带来的缺陷，使这类数字混沌加密系统走向实用。

Based on the above researches, a method of generation of special ensemble perturbation for weather regime transition is studied.

进而在此基础上，针对天气环流转型的预报，研究了特殊的集合扰动产生方法。

However,the physical base and initial perturbation method of ensemble mesoscale prediction is the new problem that ensemble.

中小尺度灾害天气集合预报的物理基础和初值扰动方法是集合预报面临的新问题。

Perturbation method of boundary geometry is used in rectangular waveguides with one-dimension perturbed walls and mode analyses are made.

用边界形状摄动法研究具有一维扰动壁的矩形波导问题并对其进行了模式分析。

Specifically,- By using Melnikov method of perturbation criteria, the conditions of periodicparamtric perturbations to control chaos in Lorenz system are discussed.

具体可以分为：-利用微扰判据的Melnikov方法讨论周期扰动参数引导Lorenz混沌系统进入低周期轨道的参数条件。

For a single machine infinite bus power system with STATCOM connected at the electrical mid point of the equivalent transmission line, a unified and extended linear state space system model is firstly formulated by linearizing around the typical operating point.

针对单机无穷大母线联络线中间带静止同步补偿器的电力系统，建立了统一的状态空间模型；并在此基础上，应用信息结构约束下的LQ最优控制理论和算法，得到输出反馈的STATCOM与机组励磁的最优分散协调控制器；应用数字仿真研究它们在系统受到大小扰动下的控制性能和特点，并与传统的电压偏差PID励磁调节器进行了比较。

In midlatitude, the ionospheric response to southward turnings in summer and equinox and by night is stronger, which fades out with latitude decreases. During the recovery phase the irregular fluctuation in the ionosphere comes forth. In low-latitude, the disturbance caused by the turnings is strong in summer and equinox and weak in winter, although it tends to be immersing into the background disturbances.

在中纬，发生在夏分季和夜间的翻转能造成较强的电离层负响应，其幅度随纬度的降低而变弱，在恢复过程中存在不规则振荡；在低纬，南向翻转引起的电离层响应在夏分季较强，在冬季则较弱，且易被淹没在电离层自身的扰动中。

Secondly, the monitoring and diagnostic integration concept was proposed for the hybrid system, based on this assumption, the monitor and diagnosis technology for running process of DMF recovering vaporizer was analyzed. The hybrid Petri nets information model describing the miscellany characterization for production process and controller model for diagnosis and decision were given. The combined propagation condition between equipment failure and heavy disturbance of continuous parameters was also discussed. The simulation results suggest that the methods in this work are valid.

其次，论文针对混杂系统提出了监控与诊断的集成概念，在此基础上进行了DMF回收蒸发罐运行过程的监控与诊断；建立了描述生产过程混杂特性的HPN信息模型和用于诊断决策的控制器模型，探讨了设备故障和连续参数大的扰动的合成传播问题，仿真结果说明了本文设计方法的有效性。

Simulation results show that AC servo system based on proposed mixed control strategy can satisfy the systems need of speediness、Stability and robustness preferably.

仿真结果表明，应用本文所设计的RBF神经网络与PID复合控制器能获得较高的动态和稳态性能，并对参数变化和负载扰动具有良好的鲁棒性，可很好地满足系统的高性能指标要求。

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。