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损耗大气
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  dissipative atmosphere
     A THEORY ON NONLINEAR INTERACTION OF GRAVITY WAVES IN A DISSIPATIVE ATMOSPHERE
     损耗大气中重力波的非线性相互作用理论
短句来源
     TRANSPORT EQUATION OF INTERNAL GRAVITY WAVES IN A DISSIPATIVE ATMOSPHERE
     损耗大气中随机重力波场的传输方程
短句来源
     NONLINEAR INTERACTION EQUATIONS OF INERTIAL GRAVITY WAVES IN A DISSIPATIVE ATMOSPHERE AND THEIR PRELIMINARY DISCUSSION
     损耗大气中惯性重力波的非线性相互作用方程及其初步讨论
短句来源
     In the light of an idea that the dynamics of gravity waves in the middle and upper atmosphere is determined jointly by nonlinear interaction and molecular disspation, a set of equations depicting the nonlinear interactions of gravity waves in a dissipative atmosphere is derived in the frame of weak nonlinear theory.
     基于中高层大气重力波动力学是由非线性过程和损耗过程共同决定的物理思想,本文采用弱非线性相互作用近似,推导出损耗大气中重力波的非线性相互作用方程.
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  “损耗大气”译为未确定词的双语例句
     The transport equation provides a basis for studying the budget and balance of gravity wave energy in the middle and upper atmosphere.
     损耗大气中重力波场的传输方程是研究中高层大气重力波能量收支平衡的出发点。
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  相似匹配句对
     Loss and refraction of laser transmitting in the atmosphere
     激光在大气传输中的损耗和折射
短句来源
     The time variation and direction variation of atmospheric loss are evaluated initially.
     初步评估了大气损耗的时空差异;
短句来源
     Maagnanimous Beijing
     大气北京
短句来源
     atmospheric corrosion
     大气腐蚀
短句来源
     The reflection loss(R.L.)
     材料反射率损耗(R.L.)
短句来源
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In the light of an idea that the dynamics of gravity waves in the middle and upper atmosphere is determined jointly by nonlinear interaction and molecular disspation, a set of equations depicting the nonlinear interactions of gravity waves in a dissipative atmosphere is derived in the frame of weak nonlinear theory. The equations can be used to study both interactions of fixed-phase and random-phase gravity wave packets. Starting from the equations we investigate the interaction of three discrete gravity wave...

In the light of an idea that the dynamics of gravity waves in the middle and upper atmosphere is determined jointly by nonlinear interaction and molecular disspation, a set of equations depicting the nonlinear interactions of gravity waves in a dissipative atmosphere is derived in the frame of weak nonlinear theory. The equations can be used to study both interactions of fixed-phase and random-phase gravity wave packets. Starting from the equations we investigate the interaction of three discrete gravity wave packets. When an intense large-scale primary gravity wave propagates through the dissipative atmosphere, it likely decays into secondary waves through three wave interactions. The amplitudes of the secondary waves grow exponentially. The molecular dissipation and frequency dismatch yield a threshold value of horizontal fluid velocity associated with primary wave, only above this threshold the exponential growth of the amplitudes of the secondary waves can set in. The threshold value takes its mininum under the condition of resonance. The frequency dismatch leads to a variation in the intrinsic frequencies of the secondary waves. The magnitude of the variation is just a half of the dismatch value.

基于中高层大气重力波动力学是由非线性过程和损耗过程共同决定的物理思想,本文采用弱非线性相互作用近似,推导出损耗大气中重力波的非线性相互作用方程.这组方程是研究固定相位和随机相位重力波相互作用问题的出发点.通过引入平均振幅,我们得到了损耗情况下离散重力波的三波相互作用方程,该方程描述了重力波波包非线性时空演变的规律.作为该方程的一个具体应用,我们考虑了由于波-波相互作用产生的不稳定性.当一大尺度大振幅的主重力波通过大气传播时,非线性相互作用可能导致两个次级波振幅随时间指数增长.由于分子损耗和频率失配,主波的振幅必须大于一个阈值,这种指数增长才可能出现.共振条件满足时,阈值变为最小.频率失配还会导致次级波本征频率发生改变,改变的大小是频率失配值的一半.

Observed atmospheric gravity wave field consists of a large number of ensemble of spectral components with various spatial and temporal scales. Nonlinear interaction may yield energy transfers among the spectral components, consequently resulting in an evolution of wave spectrum. This is called the internal transfer process in the gravity wave spectrum. Starting from the nonlinear interaction equations of gravity waves in a disspative atmosphere, a transport equation is derived by using the 'random phase approximation'....

Observed atmospheric gravity wave field consists of a large number of ensemble of spectral components with various spatial and temporal scales. Nonlinear interaction may yield energy transfers among the spectral components, consequently resulting in an evolution of wave spectrum. This is called the internal transfer process in the gravity wave spectrum. Starting from the nonlinear interaction equations of gravity waves in a disspative atmosphere, a transport equation is derived by using the 'random phase approximation'. Since the molecular dissipation is taken into account, the evolution rate of the gravity wave spectrum has been changed. The transport equation provides a basis for studying the budget and balance of gravity wave energy in the middle and upper atmosphere.

从包含分子粘性的非线性相互作用方程出发,采用随机相位近似,推导了损耗大气中重力波场的非线性传输方程。由于分子损耗的引入,谱演变的速率发生了改变,在某些情况下,还会得到与无耗条件下的传输规律相反的结论。损耗大气中重力波场的传输方程是研究中高层大气重力波能量收支平衡的出发点。

A set of the interaction equations of inertial gravity waves in a dissipative atmosphere on the basis of the weak nonlinear theory is derived. This work generalizes previous studies by including the effects of spatial propagation, viscous dissipation and continuous spectrum. It is shown that the wave dissipation rate produced by viscosity depends on the spatial scale and propagation direction of inertial gravity waves. Coriolis effect makes the interaction coefficients complex. Starting from the equations...

A set of the interaction equations of inertial gravity waves in a dissipative atmosphere on the basis of the weak nonlinear theory is derived. This work generalizes previous studies by including the effects of spatial propagation, viscous dissipation and continuous spectrum. It is shown that the wave dissipation rate produced by viscosity depends on the spatial scale and propagation direction of inertial gravity waves. Coriolis effect makes the interaction coefficients complex. Starting from the equations we examined the parametric instability of inertial gravity waves. It is indicated that there exists a threshold of primary wave amplitude. The magnitude of the threshold is proportional to the dissipation rate of secondary waves. When the primary wave amptitude exceeds the threshold, the secondary waves grow exponentially.The interaction brings about a variation in the frequencies of the secondary waves. The magnitude of the variation is proportional to the energy density of the primary wave.

根据弱相互作用理论,本文建立了损耗大气中极性重力波的非线性相互作用方程.这组方程在三个方面推广了前人的工作:考虑了波的空间传播;包含了粘滞产生的衰减;波谱可以是连续的.粘滞衰减率的大小与波的空间尺度以及传播方向有关.Coriolis力的引入使相互作用系数成为复量.根据这组方程,考察了惯性重力波的参量激发.结果表明:在共振条件满足时,主波存在一个阈值,阈值大小与次级波的损耗率成正比.当主波振幅大于这个阈值时,次级波将指数增长.在相互作用过程中,次级波的频率将发生变化,变化的大小与主波能量成正比.

 
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