The colliding galaxies would have created a powerful density wave that would have swept out the material into an expanding ring, stimulating star formation.
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。
In this paper we discuss the spiral structure of dish galaxies in three-dimension according to the density wave theory.
本文从密度波理论出发，讨论三维盘状星系的旋臂结构。
Doping can excite a charge density wave weakening the spin density wave against the stability of the ferromagnetic state.
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。
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。
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.
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。
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.
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。
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.
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。
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.
高频脉动属于声波型脉动，低频脉动属于密度波型脉动。
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.
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。
This paper describes the experimental study of two phase density wave oscillation in natural circulation loop. The oscillation curves under different conditions are obtained.
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。
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.
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。
The rock acoustic parameters in this paper include wave amplitude, spectral amplitude, spectral area, spectral density, wave velocity and attenuation coefficient etc.
这些岩石声学参数为波幅、谱幅、谱面积、谱密度、波速度、衰减系数等。
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.
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.
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。
应用推荐