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1·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。

2·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。

3·The following conclusions are obtained: 1. the density wave in an unstable area develops a finite continuous oscillation.

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。

4·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。

5·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。

6·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。

7·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。

8·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.

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。

9·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。

10·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。