密度波牵涉到恒星轨道的同步化。
对电荷密度波也作了简单的介绍。
本文从密度波理论出发，讨论三维盘状星系的旋臂结构。
In this paper we discuss the spiral structure of dish galaxies in three-dimension according to the density wave theory.
高频脉动属于声波型脉动，低频脉动属于密度波型脉动。
It is shown that the flow instability with high frequency belongs to acoustic oscillation and the flow instability with low frequency is density wave instability.
本文提出了描述并联沸腾管内两相流密度波型脉动的线性均相模型。
This paper presents a linear homogeneous model describing two-phase flow instability.
得到如下一些重要结论：1。不稳定区域密度波振荡为有限的持续振荡。
The following conclusions are obtained: 1. the density wave in an unstable area develops a finite continuous oscillation.
结果表明：各个参数对密度波型脉动界限值的影响规律与实验值是一致的。
The results of the calculation indicate that the law governing the impact of various parameters on the density-wave type pulsation limit values is in agreement with that of the experimental values.
掺杂能激发电荷密度波，从而削弱了自旋密度波，最终不利于铁磁态的稳定。
Doping can excite a charge density wave weakening the spin density wave against the stability of the ferromagnetic state.
同时，从三维盘状星系密度波的稳定性讨论推出了径向速度弥散度的变化规律。
We also obtain the variation of the radial dispersion of velocities with r through the stability of the density wave in three-dimensional dishlike galaxies.
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。
Last go-round, M82's gravity likely raised density waves rippling around M81, resulting in the richness of M81's spiral arms.
碰撞的两个星系产生了强烈的密度波，把物质推到外侧的环形上，并激发了恒星的形成。
The colliding galaxies would have created a powerful density wave that would have swept out the material into an expanding ring, stimulating star formation.
密度波理论中星系激波的解大都假设为局部的，并且往往不考虑星际气体自引力的影响。
It is generally assumed the solution of galactic shock wave is local one and takes no account of gaseous self-gravitation in the theory of density wave.
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。
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.
加大堆芯出口水力提升段的质量惯性能有效地抑制可压缩性密度波振荡，提高系统的稳定性。
By increasing the inertia of riser in the core outlet, the compressible density wave oscillation can be suppressed effectively and the system stability can be enhanced.
在自然循环水回路上进行了两相流密度波不稳定性的实验研究，得到了不同工况下的实时脉动曲线。
This paper describes the experimental study of two phase density wave oscillation in natural circulation loop. The oscillation curves under different conditions are obtained.
基于密度波理论的非线性方程，用定性分析理论可导出旋涡星系的演化方向和由观测可得到的演化条件。
Based on the nonlinear equations of the theory of density wave, the evolutionary direction and the observable conditions on spiral galaxies may be derived by the qualitative analysis theory.
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.
频域近红外光谱系统利用一个高频正弦信号对光源进行调制，从而在大脑这类强散射介质中形成一种漫射光子密度波。
The frequency-domain NIRS instruments modulate the light with a RF sine wave, which generates diffuse photon density wave (DPDW) in turbid tissue like brain.
本文介绍了目前生物医学光子学领域内引人注目的新技术—扩散光子密度波技术的理论基础、 系统及国内外的最新进展。
The paper introduces the present knowledge of the theory and technology of diffusion photon density wave (DPDW) which have been focus of the recent research.
“如果赝隙真的是电荷密度波，那将是一个非常非常重大的发现。因为人们在过去几十年里都在寻求这个问题的答案。”他说。
"If it is true that the pseudogap is a charge-density wave, that would be a major, major outcome because people have been looking for this for the past decade," he said.
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。
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.
这种过剩密度的波就是声波。
出现内波是因为海洋是分层的，深层水更凉，密度高而且含盐量高，浅层水更暖和，密度小而且更淡。
Internal waves happen because the ocean is layered. Deep water is cold, dense, and salty, while shallower water is warmer, lighter, and fresher.
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.
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 contour currents colliding with the overlapped low density normal seawater can create internal waves of large scale at the interface of the thermohaline.
根据海浪波能谱，计算了舰船摇荡运动的功率谱密度和舰船的随机摇荡运动。
The power spectral density of ship's motion is calculated based on ocean wave energy spectrum and the movement spectrums of the ship's random motion are calculated and created.
目的观察高功率密度毫米波照射对大鼠免疫功能的影响。
Objective To elucidate the effects of high powered density millimeter wave irradiation on immune function of rats.
随着激光能量密度的增加，声表面波的幅度由线性变化转换为非线性变化。
With the increase of the incident power density, the amplitude of SAW changes from linear to nonlinear.
以TNT为例进行了计算，给出了其爆轰波内压力、密度、流速和声速等参数的分布。
As an example, the distribution of the detonation pressure, density, particle and sound velocity along the detonation profile are given for TNT.
目的：观察高功率密度(HPD)毫米波对晚期癌症患者癌性症状和全身改善的疗效。
Objective To observe the treatment results of cancer signs and general condition of late stage cancer patients by high power density (HPD) millimeter wave (MW).
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