But if it is to be perturbation to distinguish it from the same background, then the need for a separate background lighting, so there will be a so-called background light.
但是如果要想把被摄者同背景区别开来的话，则有必要对背景进行单独照明，于是就有了所谓的背景光。
Perturbation calculation will be required to rapidly determine the changes of reactivity caused by core neutron cross sections perturbation in reactor physics design and analysis.
在反应堆物理设计和分析时，经常要进行微扰计算，以快速分析堆芯中子截面扰动下反应性的变化量。
However, when its denominator was expanded in a Taylor series, a size consistent perturbation expansion was obtained, for the size inconsistent terms turned out to be cancelled out.
但将它的分母作泰勒展开，经过重新整理，将那些大小不一致的项消去后，得到的新微扰展开式是逐项大小一致的。
The optimal control and simulation method for systems with stochastic perturbation were investigated in the case that control effort is to be considered under internal model control (IMC) structure.
在内模控制（IMC）结构下对控制能量存在约束时一类随机摄动系统的最优控制及其仿真方法作了探讨。
In this paper we address the GHP and propose a finite perturbation analysis (FPA) technique that can be used to dynamically solve the problem.
在本文中，采取地面保持策略，并引入有限扰动分析，来解决航班的动态分配。
Based on this framework, we address the GHP and propose a finite perturbation analysis (FPA) technique that can be used to dynamically solve the problem.
基于这个框架，给出了GHP的一个有限扰动分析(FPA)方案来动态解决等待时间问题。
In order to discuss the stability of these solutions, a perturbation must be add to these solutions, and the evolution of the perturbation should be analysed.
为了讨论这些解的稳定性，必须在这些解的基础上叠加一个小扰动，并分析小扰动的演化。
When the system close -loop controlling is realized for lower frequency perturbation, the approximate diffraction limited line spread function can again be achieved on the image plane.
对于低频扰动，当系统实现闭环控制后，像面上线扩散函数已接近衍射极限。
However, the perturbation methods for distinct or repeated eigenvalues can not be directly used to deal with the vibration modes with close eigenvalues.
然而，已有的孤立特征值摄动法和重特征值摄动法都难于用来解决密集模态的摄动问题。
If mass or stiffness perturbation is considered to be a harmonic excitation, one has obtained a forced vibration equation to the original structure.
将质量和刚度摄动看成是对原结构的简谐激励，获得原结构广义坐标的受迫振动方程。
In this paper, a method is developed, which may be called the method of mode perturbation, to analyze the characteristics of vibration of complicated beams.
针对低矮小开口剪切型剪力墙，研究基于直接模态摄动法原理的结构动力特性的半解析分析方法。
This study illustrated that the theorem could be also applied in a case where the sources and sinks are on the circle by means of the regular perturbation method.
经典圆定理只证明了奇点位于圆外的情况，本文用正则摄动法证明了源和汇位于圆上时，圆定理也是适用的。
The accuracy of extrapolation will be raised in calculating the perturbation elements with the improved initial values.
利用改进后的初值进行摄动外推，其精度可明显提高。
Two impulsive control strategys for formation keeping were put forward with regard to the problem that satellites formation could be destroyed under J2 perturbation.
针对卫星编队轨道构形在J2摄动干扰作用下被破坏的问题，给出了两种构形保持脉冲控制策略。
The symplectic conservative perturbation for a transfer symplectic matrix should be based on the canonical transformation method.
辛矩阵只能在乘法群下保辛，故传递辛矩阵的保辛摄动必须采用正则变换的乘法。
When atoms and molecules are radiated by ultra intense laser pulse, a series of new non-linear phenomena which can't be interpreted by perturbation theory appears.
实验表明在超强超短激光脉冲的作用下，原子分子会出现一系列微扰理论无法解释的新现象。
Under coulostatic perturbation, the transition process may be described by a group of linear differential equations, the key of deriving the equations is to determine the value of start condition.
恒电量微扰下的过渡过程可用一组线性微分方程组表示，求解的关键是确定其初始条件值。
The perturbations of each control point can be obtained minimizing the energy function. The weights of control points are applied to adjust the perturbation.
采用曲线的能量最小原理，可以求出每个控制顶点的扰动量，给每个控制顶点赋予一个权重，以调节扰动量的大小。
The perturbation approximation should be symplectic conservative.
摄动法近似应当保辛。
But if the cone Angle is assumed to be small then a boundary perturbation scheme can be developed. The asymptotic analytical solution of this flow is shown in this paper.
但在小锥角条件下，采用摄动理论的边界摄动方法，我们获得了该流动的渐近分析解。
It is pointed out that the wave function of system can be exactly solved if the perturbation only depends on the time, and the exact expression of transition probability amplitude can be obtained.
本文通过计算指出，若微扰只与时间有关，则体系的波函数可以精确求解，从而得到跃迁概率振幅的精确表达式。
The shape, width and peak of the power gain spectra of modulation instability will be influenced by the size relationship of the perturbation frequencies of the two waves.
两光波扰动频率的大小关系会影响不稳定增益谱的谱宽、峰值和形状。
The results show that the effect of second-order perturbation results on the natural frequency of arch bridge can be ignored.
结果表明二阶摄动结果对拱桥固有频率的影响可以忽略；
By the perturbation method, the formula of the critical temperature difference may be found and the error of which may also be estimated.
采用摄动理论，本文导出了路面板临界铺设温差的渐近表达式并给出了误差分析。
In physics, both fast process and slow process exist in a system, this kind of system can be analyzed and controlled using singular perturbation strategy.
物理上包含快过程和慢过程的系统可以用奇异摄动方法分析和控制。
The frequency stability, amplitude stability and harmonic content can be deduced from the second order perturbation solution of that equation.
方程的二阶近似解显示出非线性效应对振荡频率稳定度、振幅稳定度及波形正弦纯度的影响。
Usually these equations can be solved using the method of perturbation approximation in quantum mechanics.
通常利用量子力学的时间微扰法可求得这类方程一次近似解的黄金定律。
The uncertainty may be solved by the perturbation method to the motion equations of the dynamic system.
这些不确定性可以归结为对动力学系统运动方程序的摄动。
The first three terms of the perturbation are obtained, which can be used for two or three photon resonant processes.
计算到三阶微扰项，其结果可用于双光子及三光子共振过程。
When uses the way of some kind of fixed installs, it would be possible in the greatest to reduce the error that produces from the perturbation of flow field through the adjustment the angle.
当采用某种固定的安装方式时，通过调整超声波流量计的安装角度可以在最大程度上降低因为流场扰动产生的误差。
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