群速度

Taking into account of the distribution of the field and group velocity mismatch we also give the optimized size of the new detector.

根据辐射场在晶体中分布与超快脉冲群速度失配，还给出了探测器制作的尺寸要求。

Though this model maybe still work well in many observations, it will bring about two insurmountable problems about Q and the group velocity.

虽然该理论能够比较好的说明某些观测现象，但仍存在两个无法逾越的困难：Q值问题和群速度太大的问题。

The main contents include studying purpose, researching object, the introduction about this course; governing equations, boundary conditions for an inviscid irrotational flow, linearized approximation for small-amplitude waves; illuminations of wave factors and relevant physical variables; the propagating waves in deep and shallow water; discussion of physical meanings of group velocity.

包括学习目的、研究对象、主要内容简介；控制方程，描述无粘、无旋运动的边界条件，对边界条件的线性化近似；波要素和有关物理量的介绍；深水和浅水条件下的行波问题；讨论群速度的物理意义。

We also introduce the K · P perturbation theory to expand the energy E to specific point k0 and bring the group velocity and effective mass into our discussion.

接著我们引用K· P 微扰近似的方法在特定k0展开能量E将群速度和等效质量带入我的讨论中。

The new method is based on the approximate expression of phase angle in terms of ray angle.

本文基于以射线角近似表示相角的思想，提出了一种弱各向异性条件下，群速度射线角近似表示的新方法。

The results show that the quintic nonlinearity plays a role similar to the case of neglecting the group-velocity mismatch in modifying the modulation instability, namely, the positive and negative quintic nonlinearities can still enhance and weaken the modulation instability, respectively.

结果表明，五阶非线性对调制不稳定性的影响与忽略群速度失配的情形是类似的，即正负五阶非线性分别能够增强和减弱调制不稳定性。

The relationship of the probe transmissivity with different probe detuning and coupling Rabi frequency was obtained.

分析了自旋子能级非均匀线宽及光学跃迁非均匀线宽对电磁感应透明和群速度减慢的影响，这两个线宽的增加不同程度地抑制了电磁感应透明。

For example, all previous theoretical predictions and experimental observations have been questioned by Valanju et,wherein the authors claim that the presence of dispersion prevents power transmitted at RHM-LHM interface from refracting at a negative angle, which means the refraction of group velocity n_g carrying the physics information isall along positive refraction, but "negative refractive material " means only the refraction of phase velocity np is negative.

涉及最多的是负折射现象在物理上的因果率，例如Valanju等人通过一些理论计算认为所谓的"负折射率材料"只是相速的折射率n_p可以是负的，而携带物理信号的群速度的折射率n_g永远是正的，由此引发了许多争议。

In addition, the nonlinear processes such as cross-phase modulation, non-degenerate two-photon absorption, and stimulated Raman scattering must also be considered for double wavelengths propagating in waveguide.

在归纳分析了SOI对光信号处理的研究进展的基础上，进一步完善了超快脉冲在脊形硅波导中演变时所满足的线性和非线性传输方程，在此非线性方程中包括波导线性损耗、群速度色散和三阶色散等线性效应；同时也包含了自相位调制、简并双光子吸收、自由载流子吸收和自由载流子色散等非线性过程；当双光场在波导中传输时，脉冲之间的交叉相位调制、非简并双光子吸收和受激拉曼散射效应等非线性效应也被考虑。

With the "four-city areas" of the rapid construction and development, chemicals, textiles, mechanical and electrical, food, the five pillars of the pharmaceutical industry and businesses gather pace Cluster significantly speed up the pace, continued extension of the chain pillar industries, supporting industries to improve the environment.

随着&一城四区&的快速建设和发展，化工、纺织、机电、食品、制药五大支柱产业的集聚步伐和企业集群速度明显加快，支柱产业链不断延伸，产业配套环境日益改善。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。