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.
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.
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.
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.
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.
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.
在近简并的封闭三能级V系统中，一束弱激光探测场的群速度可以通过控制一单色驱动场的强度实现慢光速到超光速的转换。
This paper reveals that the group velocity of a weak laser probe field can be manipulated by controlling the intensity of the driving field applied to a near-degenerate closed three-level V system.
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.
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.
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.
提出自结合方法，导出波传播的限定条件，在找到相应的正交序列后，完全得到弹性波导系统中解析形式的频散方程、群速度方程和稳态响应。
After finding the orthogonal sets corresponding to the guided-wave restriction condition, the analytic dispersive equation, group velocity equation and steady response are obtained simultaneously.
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.
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.
对BBO晶体的材料特性，有效非线性系数，以及BBO晶体的走离角与空间走离效应，群速度失配与时间走离效应进行了讨论。
The properties of nonlinear crystal BBO is presented. The walk-off Angle and the spatial walk-off effect, the group velocity mismatch and the temporal walk-off effect are discussed.
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.
在理论分析的基础上，建立了杆条群速度及角度散布参数预估的工程分析模型。
With the theoretical analysis and experiment dada of document, the engineering model of rod dispersing velocity and angel is build.
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.
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.
分析结果表明，带楔角的取样反射镜与后续光路中使用楔形真空窗口构成了一对棱镜，产生负的群速度色散。
The result shows that the edged sampling mirror and the edged vacuum window can be treated as a pair of prisms, which generates negative group velocity dispersion.
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.
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.
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.
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.
论述了光纤群速度色散、偏振模色散及光纤中各种非线性效应对光波分复用系统性能的影响，并给出了为减小其影响而应采取的措施。
The effects of group velocity dispersion, polarization mode dispersion and nonlinearity in fiber on the performance of wavelength division multiplexing system are analyzed in detail.
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.
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.
本文研究了半导体超晶格热电材料的声子谱、群速度和热导率等热输运问题，重点通过对声学声子群速度特性的研究来理解超晶格材料的导热性质。
In this paper, the heat transport characteristics such as the phonon spectrum, the group velocity and the thermal conductivity of the semiconductor superlattice thermoelectric materials were studied.
由于载流子引起的群速度色散效应，使远离饱和区工作的TW-SLA会对有频率啁啾的光脉冲产生展宽或压缩。
The chirped pulses will be compressed or broadened because of carrier-induced group-velocity dispersion when TW-SLA operates far below saturation.
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