It is not speed, but variations in speed that cause density waves.
并不是速度高低引起了拥堵波，而是速度的不一致性。
Last go-round, M82's gravity likely raised density waves rippling around M81, resulting in the richness of M81's spiral arms.
最近一个周期中，M82的重力增强了M81周围密度波的脉动，导致M81的旋臂更浓密。
Gravity, however, causes density waves to move out through the galaxy which in turn triggers the formation of hot, bright young stars, producing the ring that we see in this picture.
引力会使密度波穿透星系，继而形成炽热、耀眼的年轻恒星，产生我们在图片中看到的光环。
Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy just above NGC 474 is causing density waves to ripple though the galactic giant.
另一种说法是，壳状结构如同是池塘中的波纹，是NGC 474与位在其上的螺旋星系正在进行的碰撞所产生的密度波搅动而激起的。
Normally, such electron acceleration is difficult or impossible because the plasmasphere's high plasma density prevents the chorus waves from efficiently interacting with particles.
由于等离子层中等离子的高浓度会阻止哨声波与粒子之间相互影响的有效性，故通常此类的电子加速是很难或几乎是不可能实现的。
The contour currents colliding with the overlapped low density normal seawater can create internal waves of large scale at the interface of the thermohaline.
在等深流与上覆低密度水体之间的界面上具备产生大规模界面内波的条件；
The simulated variable density log map shows many important features of reflected waves, which are the base for identification of the reflected wave.
用模拟的变密度波形图显示了裂缝反射波的许多特点，这些特点是正确地识别和处理反射波的重要根据；
The simulation of total energy flow and the density of states show that the dodecagonal QPC has photonic gap for TM polarized electromagnetic waves.
能流和态密度的计算结果都表示十二重准晶光子晶体具有光子带隙。
Higher order waves generated by a moving source in a two-layer inviscid, incompressible fluid of finite depth with small density difference were studied.
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。
In case of low crack density (less than 6%), the relationship between crack densities and velocities of the fast and slow shear waves agrees well with theoretical prediction.
在低裂缝密度(小于6 %)时，裂缝密度和横波快慢波速度的关系与理论预测相符。
The distributions of. temperature T, density N and velocity V are given using the equations coupling the MHD waves with the coronal atmosphere.
本文利用MHD波与日冕大气耦合的磁流体动力学方程组，计算得到冕洞内的日冕大气的温度T、密度N和流速V的分布。
The outer core of the earth, being in the plasma state with high temperature, high pressure, high density, and immersed in a strong toroidal magnetic field, can support varieties of plasma waves.
地球外核处于高温、高压、高密度的等离子体状态，可以支持多种磁流体波的激发和传播。
A common desert phenomenon is the mirage, an optical illusion caused when lights waves are bent or refracted by layers of air that are different in density.
海市蜃楼是沙漠里一种常见现象。它是光波在遇到不同密度的空气层而发生折射时引起的一种光幻象。
Furthermore, using the distribution of energy-density of solitary waves, some functional properties of biological membranes are explained.
此外，利用孤立波的能量密度分布解释了生物膜的某些功能特性。
The ability of the ionosphere to reflect these waves is dependent upon normal variations in the electron density at different levels.
电离层反射电波的能力取决于不同高度上电子密度的正常差别。
In-depth study, we research on how to use logging data such as sound waves, density, natural gamma to obtain rock parameters, and study how to use indoor core test to amendment it.
深入研究了如何利用声波、密度、自然伽马等测井资料确定岩石力学参数的方法，并研究了如何利用室内岩心试验对测井资料进行简单的修正。
Over time, the density of reflections arriving at your ears builds more and more until the individual waves are indistinguishable.
随着时间的推移，反射的密度到达耳朵构建越来越多，直到个体是没有区别的。
The finite amplitude solitary waves in stratified fluids of finite depth, in which the density varies with depth in lower layer but keeps uniform in upper layer, are investigated.
本文采用理论分析和符号运算相结合的方法研究有限深分层流体有限振幅内孤立波。
The finite amplitude solitary waves in stratified fluids of finite depth, in which the density varies with depth in lower layer but keeps uniform in upper layer, are investigated.
本文采用理论分析和符号运算相结合的方法研究有限深分层流体有限振幅内孤立波。
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