该流星群速度可达每秒66公里。
The shooting stars are falling at a speed of 66 km per second.
结果表明：群速度延迟使三倍频光脉冲展宽；
The results show that group-velocity mismatch broadens the width of third-harmonic pulse.
离差和群速的概念。
当介质的密度增加时（包含更多的原子），群速度就降低。
When the medium density increases (with more atoms), the slow group velocity decreases.
并对此种光栅的反射谱，时延及群速度色散进行了理论分析；
The reflection spectrum, time delay, and group velocity dispersion (GVD) of the gratings are analyzed.
因此，负群速度只是表观速度，能流的研究结果也证明了这一点。
Thus the negative group velocity is simply an apparent velocity as we shall show from the study of energy flow.
对轴上光场的相速度和群速度以及电子能量增益等物理特征作了讨论。
Some physical characteristics, such as phase and group velocities of the axial optical field, and energy gain of electrons etc.
本文阐述工作于正、负群速色散区中的光脉冲注入锁模的物理机制的区别。
The article discusses the differences in physical mechanism of mode locking by laser pulse injection between the dispersion region at positive group velocity and that at negative group velocity.
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。
The group velocity(U) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.
结果表明，波的传播速度并不等于能流速度，而与复群速度的实部近似相等。
The results show that the propagation speed of the wave is not equal to the speed of energy flux, but nearly equal to the real part of the complex group velocity.
然后连续利用多元函数级数展开，导出群角表示的相速度和群速度近似公式。
Then series expansions of multi-variable functions are applied to the derived approximations in terms of phase angles to generate the approximations in terms of group angles.
本建议定义一次群速率和一次群速率以上国际数字通道的差错性能参数和指标。
This Recommendation defines error performance parameters and objectives for international digital paths which operate at or above the primary rate.
研究结果显示，在频率域内，面波衰减系数分布与群速度分布具有一定的相关性。
The correlation property between the distribution of attenuation factor and that of the group velocity is indicated, in this study.
为了验证理论分析，设计了射频调制法测试介质膜滤波器群速度延时的实验装置。
To validate the theoretical analysis, a test system for group velocity delay was set up based on RF modulation.
在上所述的情况中，太赫兹脉冲的有效传输受限于高损耗，或导波的群速度色散。
In all the above cases, the utility for transport of terahertz pulses is limited by the high loss, or by the group velocity dispersion of the guided waves.
然后从色散介质中相速度与群速度的关系，讨论了相速度和群速度超光速的可能性。
Then the possibility of larger phase velocity and group velocity than light speed in dispersive medium is discussed.
文章研究了电磁波传播的群速与相速概念，论证了信号传送与能量传递的必然联系。
The paper studies the concepts of phase velocity and group velocity on electromagnetic wave propagation and discusses the relation between signal conveyance and energy conveyance.
要避免越来越少的平均群速度，一些跟踪仪管理员取缔这些经常被节流的标准端口。
To avoid a decreasing Average Swarm Speed, some tracker administrators are banning these often throttled standard ports.
应用等效折射率模型对折射率导模光子晶体光纤的群速度色散特性进行了详细的讨论。
The group velocity dispersion properties of photonic crystal fiber (PCF) were investigated in detail by equivalent index model.
基于标量近似理论，使用有效折射率方法对光子晶体光纤的群速度色散特性进行了详尽研究。
Based on a scalar approximation, the group-velocity-dispersion properties of photonic crystal fiber (PCF) were investigated in detail by equivalent-index model.
连系起来。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。
Taking into account of the distribution of the field and group velocity mismatch we also give the optimized size of the new detector.
分析研究了空间光孤子脉冲化后在反常群速色散的克尔非线性平面光波导中的传输特性和稳定性。
Evolution of pulses obtained by modulating spatial optical solitons in a Kerr nonlinearity planar waveguide with anomalous dispersion is investigated.
研究结果表明，群速度色散（GVD）对大啁啾脉冲的影响很小，谱宽对自聚集的影响可以忽略。
The results showed that the effect of group velocity dispersion(GVD) on the pulse with large chip was slight and the effect of spectral width on the self-focusing properties could be ignored.
研究发现，当光脉冲通过一个原子气室时，在进入前其峰即到达出口处，造成负渡越时间和负群速。
Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time, and negative group velocity.
用光束脉冲矩阵法分析了多色光学谐振腔的稳定条件；给出了计算腔内净群速度色散的准确表达式。
The stable condition of multi wavelength optical cavities is discussed by the method of ray pulse matrices, and the formula of net GVD is deduced.
本文概述了光子晶体光纤的三个突出的优点：单模传输特性、高非线性效应和可控群速度色散特性。
We introduce three unique properties of PCF which are endlessly single mode, controllable dispersion and high nonlinearity.
可以针对ati地区的地质情况，给出体波群速度和相速度变化图案，为进一步的理论研究提供便捷。
For complex structural geology of ATI areas, this research can provide the patterns of body-wave group-velocities and phase-velocities to benefit the theoretical research.
给出了轴上光场的相速度和群速度、加速电位及电子能量增益等的解析表达式，并作了数值计算和分析。
The analytical expressions for the phase and group velocities of the axial optical field, accelerating potential and energy gain etc. are derived and are used to make numerical analysis.
推演说明在弹性地层的井眼中，伪瑞利波不可能以横波速度传播，但其群速度与横波速度可以非常接近。
Theoretical deduction says that in a borehole penetrating elastic formations, pseudo Rayleigh wave does not take shear-wave velocity, but its group velocity may be very close to shear-wave velocity.
推演说明在弹性地层的井眼中，伪瑞利波不可能以横波速度传播，但其群速度与横波速度可以非常接近。
Theoretical deduction says that in a borehole penetrating elastic formations, pseudo Rayleigh wave does not take shear-wave velocity, but its group velocity may be very close to shear-wave velocity.
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