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.
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.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" - the speed at which information travels - cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
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.
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.
而群速度失配可极大地改变调制不稳定性增益谱的形状、峰值和位置。
The group-velocity mismatch can considerably change the gain spectrum of modulation instability in terms of its shape, peak value, and position.
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.
本文用单台多重滤波方法测定了经过青藏高原地区瑞利波群速度频散曲线。
The group velocity dispersion curves of Bayleigh waves through most of the Qing-hai-Xizang Plateau are obtained, using the single-station and multiple-filtering process.
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.
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.
分析了它们的稳态解，发现稳态的强度分布依赖于群速度强度与等效总能量的比值。
The stationary states are analyzed, and it is found that their intensity distribution depends strictly on the ratio of the group-velocity delay strength to the effective total energy.
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.
本建议规定了工作在低于数字系列的一次群速率的国际数字连接的差错性能参数和指标。
This Recommendation defines error performance parameters and objectives for international digital connections operating below the primary rate of the digital hierarchy.
分析了单透镜色差和群速度色散对超短脉冲高斯光束聚焦的时间分布及脉冲波面的影响 ；
The influence of lens dispersion up to second order on the spatial and temporal intensity distribution of the femtosecond Gaussian beam was analyzed.
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.
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.
本建议涉及在S和T参考点处使用的一次群速率用户—网络接口的第1层电的、格式的和通路特性。
This Recommendation is concerned with the layer 1 electrical, format and channel usage characteristics of the primary rate user-network interface at the S and T reference points.
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.
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.
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