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.
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.
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.
使用基于密度泛函理论的第一原理平面波赝势法，研究了W原子链的结构稳定性和电子结构性质。
The structural stabilities and electronic structures of W atomic chains are studied by employing first-principles plane wave pseudopotential method based on the density functional theory.
采用逐波相乘的光谱分析法，对密度值进行了理论计算。根据目前国际密度计与色度计的生产状况，探讨了2000年图象印刷色彩测量方法的发展趋势。
The paper applies the method of spectral analysis of multiplication by waveband to caculatedensity value in theory and discusses the future of the method of printing color measurement in2000.
所有计算都是基于密度泛函理论(DFT)框架下的第一原理平面波超软赝势方法。
It was performed by adopting the first-principles calculation of plane wave ultra-soft pseudo-potential technology of based upon the Density Function Theory (DFT).
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.
本文基于局域密度泛函理论（LDF）和LMTO-ASA方法，计算了稳定的六角结构碳化钨和碳化钼的自洽能带结构，总态密度和分波态密度。
The self-consistent band structure, total and partial density of states for the stable compounds hcp-WC and MoC are calculated by the LMTO-ASA method based on Kohn-Sham's LDF theory.
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.
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.
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