The course also examines approximation methods: WKB method, variational principle, and perturbation theory.

...perturbations in Jupiter's gravitational field.

木星重力场的微小变化

And using perturbation moment theory, the variances of random differential equations material point shift were gotten.

通过小噪声摄动理论, 建立了小噪声随机微分方程.

Coordinate perturbation method, a novel optimization method, is recommended here.

本文提出了一种新的最优化算法 —— 坐标扰动法.

Robust stabilization of a class of linear system with nonlinear perturbation is discussed in this paper.

摘要主要讨论了一类非线性扰动不确定时滞系统的鲁棒镇定问题.

The parameter uncertainty is considered during the design and the controller is robust to parameter perturbations.

在设计时考虑了系统参数不确定性,从而控制律具有一定的鲁棒性.

In order to keep variations negligibly small, only small perturbations will be considered.

为了使变分小到可以忽略的程度, 仅考虑微小的扰动.

Perturbations of cardiac repolarization increase the risk for life-threatening arrhythmias and sudden cardiac death.

心脏复极过程的紊乱,会增高危及生命的心律失常及猝死的发生.

Perturbations of varied nature and time delays are unavoidable in real systems.

在实际系统中总是存在着各种干扰和一定的时滞.

From fluid equations, the differential equations governing the low frequency electrostatic perturbations are deduced.

从流体方程组出发, 导出了描述低频静电扰动的微分方程组.

All perturbations from normal, including vital signs and unusual symptoms, must be addressed.

必须排除对对正常所有状态如生命体征和异常症状的所有干扰.

Patterns and data of phase perturbations are given.

文中给出了计算实例及相位扰动量数据.

Angular perturbations tend to increase instead of decrease.

角扰动倾向于增加而不是减少.

This is the chief thing : not to be perturbed.

最要紧的一件事就是要沉住气.

Mother was much perturbed by my illness.

母亲为我的病甚感烦恼不安.

Never in his life had he been so perturbed.

他生平从没那么惊慌失措.

She had been perturbed by the premature announcement of his engagement.

她由于他过早地宣布婚约而心神不安.

The molecular electronic wave function is perturbed.

分子的电子波函数受到了微扰.

I was perturbed at such developments.

我为这事态的进展大为焦虑不安.

We were perturbed to hear of his disappearance.

我们听说他失踪了,都很不安.

She didn't seem to be perturbed by the setback.

她似乎并不为这次挫折感到不安.