扰动

In Chapter 4, we study the problem of output regulation for a class of switched linear systems.

第四章研究了一类带有扰动的线性开关系统的输出调节问题。

Based on the basic principles and methods of the fuzzy math, the fuzzy comprehensive evaluation system for hazard assessment of talus slope was set up.

岩堆边坡是一类具有特殊地质条件的边坡，其自稳能力较差，在外界环境及人工扰动影响下极易失稳。

The process of frequency fluctuation in the hydropower station with surge tank is impacted both by high-frequency water pressure wave and low-frequency water level fluctuation in surge tank.

在负荷变化和扰动过程中，设调压室水电站机组频率受到压力管道内水击压力波和调压室内水位波动的共同作用。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

The method parameterizes a linear time-varying system with disturbance by using Taylor series expansion.

针对存在不确定扰动的线性时变系统的轨迹跟踪控制问题，提出了基於泰勒级数的迭代学习算法。

The technocrats at China's State Administration of Foreign Exchange are not in the habit of stirring the country's capital markets.

中国国家外汇管理局的技术派官员没有扰动中国资本市场的习惯。

The influence of the variation of tem...

讨论了温度的变化对扰动大小的影响。

To study local influence of the data cases on the Score statistic for the test of varying dispersion in the nonlinear model of simplex distribution, this paper develops the local influence on the score test statistic under perturbation in the response variable and explanatory variables based on gradient method.

为了研究数据对于单形分布非线性模型变离差检验的Score统计量的局部影响，该文利用梯度方法分别研究了因变量及自变量的微小扰动对于该模型的Score检验统计量的局部影响，相应得到了度量最大局部影响的诊断统计量。

Launch dynamics and transfer matrix method of multibody system are used to develop a launch dynamics model, equations of vibration characteristics and dynamic response. The firing dispersion test method of a non-full loading fire rocket based on the idea of equal initial disturbance is presented.

应用发射动力学和多体系统传递矩阵法理论，建立了多管火箭发射动力学模型，推导出了多管火箭振动特性和动力响应方程，形成了基于等起始扰动思想的多管火箭非满管射击密集度试验方法。

The Themis satellites were launched to find the source of brief powerful geomagnetic disturbances in the Earth's atmosphere.

发射Themis卫星组的目的是寻找地球大气层中出现的短暂而强烈的地磁扰动来源。

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。