查询词典 persistent wave

Using finite difference time domain method, the electromagnetic field distribution of THz wave is simulated in a THz 2D PC splitter and by plane wave expansion method the dispersion relation and defect modes are achieved in a THz rotated PC waveguide.5. A woodpile three-dimensional (3D) PC with face-centered-tetragonal symmetry is one of the most popular 3D PCs because of its favorable band gap characteristics. Based on the woodpile fct lattice structure, we propose a novel woodpile THz lattice structure with comparatively decreased symmetry, better band gap properties and easy fabrication by varying some structure parameters.

计算结果为利用非线性光学差频方法产生THz辐射源的实验研究提供了深入和全面的理论基础；四、利用平面波展开法，通过改变二维THz光子晶体的结构参数，对二维THz光子晶体完全带隙进行了优化，分析出两种适合工作在THz波段的二维光子晶体结构；采用时域有限差分法和平面波展开法，计算出THz波在二维光子晶体"T"型分束波导，45度旋转波导中传输的电磁场分布以及缺陷模；五、Woodpile面心立方四角结构是三维光子晶体中被研究最广泛的结构之一。

This paper discusses the mechanism of the propagation of elastic surface wave,presented a method that use the tip of atomic force microscopy and beam deflexion method to on line detect the nanometer vibration of the particle in the surface wave.

本文探讨了表面弹性波传播的机制，提出了一种利用原子力显微镜微探针与光束偏转法检测纳米振动的新方法，并利用这种方法对表面波质点的纳米振动进行了实时检测。

Many natural phenomena and physical laws can be described by time dependent nonlinear differential equations, such as heat conduction equation, sound wave and elastic wave equation, reaction diffusion and convection diffusion equation, fluid and aerodynamics equations, etc.

大多数的自然现象与物理规律都可归结为与时间相关的非线性偏微分方程，诸如热传导方程、声波与弹性波方程、反应扩散与对流扩散方程、流体与气体力学方程组等发展方程。

An ideal depolarizer can be combined with a λ/2 wave-plate and a λ/4 wave-plate rotating at different angular velocities with a certain ratio.

结果表明，让两波片以不同的角速度绕光线为轴旋转，当复合波片为一个λ/4波片和一个λ/2波片组合时，只要它们的角速度满足一定的比例时，可以组合成一个比较理想的退偏器；当复合波片为两个λ/4波片组合或为两个λ/2波片组合时，无论怎样旋转都不能组合成理想退偏器。

Methods: 30 patients were treated for chronic prostatitis with extraorgan short-wave diathermy using the KF-8000 extraorgan short wave diathermy apparatus.

对30例慢性前列腺炎患者采用KF-8000体外短波热疗机进行热疗。

Short-wave /long-wave infrared dichroic beam splitters take an important role in two-band infrared imaging optical systems.

短波红外/长波红外分色片在红外双波段成像光学系统中起着重要的作用。

For these two effective focal lengths, the spots on the image surface at zero view field, 0.7-view field and full view field are all inside the airy disc. The system MTF curve of each effective focal length are accordance with the corresponding diffraction limits curve. The biggest wave aberration is smaller than 1/4 wave lengths. The maximum field curvature and maximum f-theta system distortion respectively satisfies the precision demand of the laser marking machine in China.

系统像面在0视场、0.7视场和全视场的光斑都落在相应的爱里斑以内，系统的MTF曲线接近相应的衍射极限曲线，最大波像差小于四分之一波长，系统的最大场曲和最大f-theta相对畸变都很好地满足了国内激光打标机的精度要求。

The leading products of the company is PDM1、3KW full solid state broadcasting transmitters, DAM10、25、50、100KW digital circulate modulate medium wave broadcasting transmitters, M2W10、50、100KW digital circulate medium wave broadcasting transmitters, 100W、300W、1、3、5KW full solid state frequency modulation dimensional sound broadcasting transmitters.

公司的主导产品为PDM1KW、3KW全固态广播发射机，DAM10、25、50、100KW数字循环调制中波广播发射机，M2W10、50、100KW数字幅相调制中波广播发射机，100W、300W、1、3、5KW全固态调频立体声广播发射机、远程监控系统以及发射机辅助产品等。

P-wave: An elastic body wave in which particle motion is in the direction of propagation.

P-波：质点运动方向与波传播方向相同的弹性体波。

The definition of the definition of wavelength wavelength wavelength ----: along the direction of wave propagation in the wave graph position of relative equilibrium displacement of the adjacent same time the distance between two particles.

波长的定义波长的定义----波长：沿着波的传播方向，在波的图形中相对平衡位置的位移时刻相同的相邻的两个质点之间的距离。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。