密度扰动

本文从相互耦合的大气流体方程和双流体等离子体方程出发，导出了赤道F区大气重力波和电子密度扰动的耦合色散关系，据此对两者的共振相互作用作了进一步的理论分析。

From the atmospheric fluid equations and two-fluid equations of ionospheric plasmas coupled with each other , the coupling dispersion relation of atmospheric gravity waves and electron density perturbations in equatorial F region is derived and the resonant interaction between these two modes in different mediums is analyzed theoretically .

小的密度扰动或对理想均匀性的偏离在这样的物质中不可避免。

The fact is that small density perturbations or departures from perfect homogeneity , are unavoidable in such a medium .

∧≠0宇宙密度扰动波波数K的计算式

∧≠ 0 the calculating formula of the cosmic density wavenumber K

NOx羽烟引起的局部电离层电子密度扰动

Electron density disturbance in local ionosphere caused by NOx Exhaust Plume

数值结果表明，在一定初始密度扰动范围内，这种不稳定性对x射线输出的总能量影响不显著，但对x射线功率随时间变化的曲线有明显的影响。

Numerical results show that x-ray energy output is not susceptive to sausage instabilities in a certain extent but x-ray power versus time is evidently dependent on the instabilities .

本文用约化扰动方法讨论了与电子束丝化扰动相关的孤立波，导出了束电子密度扰动所满足的K-dV方程。

The soliton induced by filamentary perturbation is discussed by using the reductive perturbation method . A K-dV equation for the perturbation of beam electrons is derived .

测量了HL1M装置上正弦周期调制馈气方法诱发的密度扰动，采用了简单的数值方法求解粒子输运方程来计算密度扰动，并与密度扰动的测量结果进行了比较。

Measurements of the density perturbation induced by the sinusoidal modulation of gas puff injection have been performed in the HL-1M plasma . The particle transport equations have been analyzed by using a simplified numerical method . The measuring results and the calculated ones have been compared with each other .

得出磁场激发比密度扰动的激发更易发生的结论。

A conclusion that the excitation of magnetic fields is more easier than that of density modification is obtained .

分析了二维情况下平面几何、柱几何和球几何中瑞利泰勒不稳定性发生非线性偏离的阈值问题，给出了三种几何中密度扰动振幅的定义，以及与界面扰动振幅的关系。

Nonlinear threshold of two dimensional Rayleigh Taylor ( RT ) instability is analyzed in planar and cylindrical and spherical geometries .

利用数值模型计算了小振幅内波在越过潜堤时的传播，以及由密度扰动引起的内波的产生和传播过程。

Numerical simulations are undertaken for the calculation domain with a submerged dike as well as the internal waves ' generation and propagation process induced by density perturbations .

在绝热密度扰动（假定初始扰动是绝热的）的方案中，有两种观念特别值得注意：1，宇宙密度波的观念。

Two ideas are worth notice in the adiabatic scenario ( assumed that the initial perturbations are adiabatic ): 1 . The idea of the cosmic density wave .

在加低杂波（245GHz）前、后，电子密度扰动和极向电场扰动的幅度及其关联性变化不大。

Experimental results show that LHW ( 2.45GHz ) does not cause great changes in the amplitude of electron density or poloidal electric field fluctuation , neither the correlativity between them .

从相对论量子流体动力学方程出发，推导出含有相对论量子修正项的激光尾场电子数密度扰动和加速场所满足的方程。

Based on the relativistic quantum hydrodynamic equations and the Poisson equation , the perturbation of electron number density and electric field of laser wakefields containing relativistic quantum effects are derived .

目前所流行的、关于大尺度结构的理论，基本上是以膨胀宇宙论和密度扰动的理论为基础的理论。

At present , the current theories of the formation of the large-scale structure are essentially gravitational clustering theories based on the theories of the expansion of the universe and of density perturbations .

当用外加泵浦电场驱动在垂直方向有密度扰动的线性非均匀等离子体时，在临界面附近扰动波谷处会激发二维朗缪尔孤立子。

When a linearly nonuniform plasma which has density perturbation in perpendicular direction is driven by pump electrical field , a two dimensional Langmuir soliton will be existed at perturbation trough near critical poi t.

漂移波引起的等离子体密度扰动相对幅度约20%，交换模引起的等离子体密度相对扰动幅度约5%。

Effects of the hot electron component on the saturated amplitudes are discussed . The amplitude of perturbed density of the drift wave is about 20 % , and that of the interchange mode is about 5 % .

对于两成分宇宙，如果密度扰动的增长时标及衰减时标满足适当的关系，则该扰动能在一种成分中触发增长扰动，而在另一成分中却是衰减的。

For a two-component universe , if the time scales of growth and damping for a density perturbation satisfy some suitable relations , the perturbation can trigger growing response in one component , but damping in the other .

就Payne-Whitham模型方程，建议了能够对不同初始密度下扰动的传播和发展进行合理数值模拟的自由项和离散方式。

This paper also proposes the free term and discrete way which can conduct reasonable numerical simulation on the spreading and developing of disturbance under different conditions of initial density based on the equation of Payne-Whitham model .

当飞行体运动时，通过飞行体与等离子体的相互作用，使周围等离子体密度产生扰动。

Through the interactions the moving bodies make the density of plasma around them disturb .

地面入射的大功率无线电波能加热电离层等离子体，引起电离层电子温度和密度的扰动，实现电离层的地面人工变态。

The terrestrial ionospheric plasma can be heated by a powerful ground-based high-frequency radio wave , which results in the disturbance of the electron temperature and density .

这组方程描述了高频调制场和电子、离子密度低频扰动之间的非线性耦合。

Through two-fluid and two-time-scale approximation , the dominating equations , which show the non-linear coupling between high frequency modulational field and the density disturbance of electrons and ions , are obtained .

泥舱沉积模型中估算了泥舱内的沙床密度，未受扰动的沉降速度。

In the hopper sedimentation models , it estimated the density of sand bed in the hopper , undisturbed settling velocity .

仿真结果证明所设计的闭环导引律正确、可行，而且能够补偿大气密度大范围的扰动。

The simulation result also verifies that the designed guidance law is correct and feasible , and it is able to compensate the disturb of atmosphere density in a large range .