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- Finally, according to the dispersion compensation theory, we use single mode fiber with negative group velocity dispersion (GVD) to compress the mode-locked EDFL output with positively chirped pulse. 最后，根据色散补偿的原理，将正啾频量的输出脉冲利用单模光纤引入的负啾频量去达到脉冲压缩的效果。
- Negative Group Velocity Dispersion Mirror 负群速差色散镜
- Negative Group Velocity in the Band Gap Range 禁带区域内负的群速度
- negative group velocity 负群速度
- Negative group velocity(NGV) 负群速
- Key words: Left - handed medium （LHM） ; Negative refraction index （NRI） ; Group refraction ; Negative group velocity（NGV） ; Negative energy; Effective permittivity; Effective permeability 作者简介:黄志洵（1936-），男（汉族），北京市人，中国传媒大学教授、博士生导师。
- A simple analysis is made of the superluminal group velocity. 分析了电磁波传播时的超光速群速。
- Superluminal Group Velocity and Effective Velocity of Information Transfer[J]. 引用该论文 郭奇志;谭维翰.
- The group velocity is estimated as 1/35 of the light speed in vacuum. 群速度估计为真空光速的1/35。
- Experiment on the characteristics of superluminal group velocity[J]. 引用该论文 滕李虎;周渭;冯宝英;偶晓娟;邹魏华.
- AML1-ETO fusion transcripts were not detected in cases of t (8; 21) negative group. t(8:21)‘组，CD19、CD34的表达明显高于t(8:21)一组(p<0.;05)，CD19、34共表达率为58
- The group velocity is the speed at which modulated signals would be transmitted. 群速度就是将调制信号发送出去的速度。
- VCL, VSL, VAP of CT positive group were significantly lower than that of CT negative group (P<0.01). 沙眼衣原体感染组精子运动参数VCL、VSL、VAP均显著低于非衣原体感染组（P<0.;01）。
- There was no significant difference in PI between CD 1 negative group before TAC and the control group. CD1阴性组化疗前的PI值与正常对照组比较无显著差异。
- There was no significant difference of apoptosis index between Fas antigen positive and negative group. Fas抗原阳性与阴性组间凋亡程度无显著差异。
- Group Velocity (Simulation output image created using MATLAB? Software.) (Provided by Prof. Chiang C. Mei. 波群速度（使用MATLAB?软体产生的模拟输出影像）。
- In UU positive group, the percentage of abnormal semen liquation is 31.7%.In UU negative group, it is 7.3%. 而非支原体感染组（124例）精液液化时间异常为9例，异常率为7.;3%25。
- Some "fishhook" curves are also given which appear from the third group velocity curve. 并给出了从第三支群速度曲线开始出现的若干条鱼钩状曲线。
- The reflection spectrum, time delay, and group velocity dispersion (GVD) of the gratings are analyzed. 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 rate of neonatal asphyxia in the CST negative group, CSE suspected group and CST positive group was 1.17%? 4.05%and 50 00%respectively. CST正常组、可疑组和阳性组新生儿窒息发生率分别为1.;17%25、4
