扰动

In order to simulate the global characteristics of wave propagation in solar chromosphere-corona, by employing a 2-dimensional MHD simulation subjected to a self-consistent non-isothermal, non-uniform initial state in spherical geometry, we study numerically the global propagation process of disturbances initiated by a pressure pulse implemented at the bottom of chromosphere.

在球坐标中一自洽的非等温非均匀等离子体初态下，应用二维理想磁流体动力学全球模拟，对色球底部压力脉冲引起扰动传播的全球问题进行了数值研究。

The computation on a sort of integrals of the product of spherical harmonics and trigonometric functions

采用二阶边界扰动原理，求取了用球谐函数表示的平衡装置静电场电势分布，从而推导出静电场干扰力矩公式。

NGC 6621 is the larger of the two, and is a very disturbed spiral galaxy.

NGC 6621是较大的一个，也是一个被强烈扰动的漩涡星系。

The fluctuation of internal property in a system is an unavoidable disturbance which does not cause change of the state for a stable equilibrium system.

处于稳定平衡态的系统，其内部物性量的涨落是一种不可避免的扰动，不会引起其状态的变化。

Stable and Unstable Orbit: An orbit is unstable if slight perturbations will cause the spacecraft moving on the orbit to leave the orbit and move far away.

稳定和不稳定轨道：不稳定的轨道上，如果稍有扰动将导致飞船在轨移动到离开轨道和移动远。

Diagram of the value of a given system state variable against time, following a disturbance.

系统出现扰动后，某一给定的系统状态变量随时间的变化曲线。

The decay of a stationary perturbation from the Couette-Poiseuille flow in the downstream is sought.

对0到2000之间的雷诺数，计算了平稳扰动的Couette－Poiseuille流的下游特征值，其特征方程类似于Orr－Sommerfeld方程。

To obtain the approximate solution, the pressure acting on the gate is divided into two parts, one is the fluctuating pressure of the flow underneath the stationary gate, which is investigated with experiment; the other is the hydrodynamic pressure due to the vibration, which is equivalent to the attached mass matrix, damping matrix and stiffness matrix of the equation.

为了获得方程的近似解，本文将作用在闸门上的水动力荷载分为两个部分，一是闸门无振动时的水流压力，用水力模型试验测定；二是由于闸门振动引起流场扰动的动水压力，通过运动方程中的附加质量阵，附加阻尼阵和附加刚度阵来等效。

Let the road excitation be a stationary random process with zero mean.

假定路面扰动是均值为零的平稳高斯随机过程。

When the plane wave returns and crosses the molecule, it produces an interference pattern with the stationary part of the electron wave function, like two trains of water waves crossing and forming a checkerboard disturbance.

一旦平面波折返并横越过分子，它便会与待在轨道上的电子波产生干涉图样，就像是两道水波相遇所形成的西洋棋盘般明暗交错的扰动。

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。