但是，斯坦利认为在较高温度下，也应该有小却明显的水密度波动出现。
Stanley, however, believes there should be small but discernible traces of thisbehaviour at higher temperatures too - seen as fluctuations in water'sdensity.
结果表明：气泡是影响分选精度的重要因素，其体积分率的变化与床层密度波动密切相关。
The result shows that the bubble is an important factor influencing coal separation, and the variation of its volume fraction is closely related to the variation of density of ADMFB.
最重要的一点是在电离层的电子和其他带电粒子的密度是波动的。
One of the most important of these is a fluctuation in the density of electrons and other electrically-charged particles in the ionosphere.
在过去的七年中，这台德国装置一直在探测引力波——由诸如中子星和黑洞这样的超密度天体引发的时空波动。
For the past seven years, this German set-up has been looking for gravitational waves - ripples in space-time thrown off by super-dense astronomical objects such as neutron stars and black holes.
种群的死亡过程和繁殖过程使种群平均密度有较明显的波动，但对种群总体水平无明显影响，种群结构也无明显变化。
The death and reproduction of the population make the mean density fluctuate but do not obviously change the overall level of population number and the population structure.
研究了运动点源在无粘、不可压且具有小密度差的两层有限深流体中生成的高阶波动。
Higher order waves generated by a moving source in a two-layer inviscid, incompressible fluid of finite depth with small density difference were studied.
第二章介绍波动方程、声能、声能流密度、声强及度量方法、双传声器互谱声强测量原理。
In chapter two, wave motion equation, sound energy, sound energy flux density, sound intensity and its scaling method and the theorem of two-microphone sound intensity have been introduced.
利用不同密度分层的盐水模拟稳定层结大气条件，在水槽中成功地模拟了两层大气分层流中二维山脊引起的地形波，得到的波动图像与线性理论模式结果在定性上基本一致。
The mountain wave induced by a ridge in two-layer stratifiedfliud has been successfully simulated in a tank . The wave pattern is almost the same compared with the linear theory result qualitatively.
压力信号的功率谱密度具有频率波动范围窄、幅值大的特点；
They obey normal distributions. Distributions of power spectral density (PSD) for pressure signal display narrower frequency range and higher amplitude.
压力信号的功率谱密度具有频率波动范围窄、幅值大的特点；
They obey normal distributions. Distributions of power spectral density (PSD) for pressure signal display narrower frequency range and higher amplitude.
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