The article gives a comment and analysis on the development of the experiment of subluminal group velocity and superluminal group velocity pulse. 对慢光速、超光速光脉冲实验进展进行了评述与分析。
Analysis of The Interference Suppression Ability of Filter Group in The Pulse Doppler Radar 脉冲多普勒雷达滤波器组对干扰抑制能力分析
Once participants are immersed, adventure becomes a powerful vehicle for taking a group's pulse, breaking through stale assumptions, identifying barriers to communication, cooperation and effectiveness, and opening minds to new ideas, roles and possibilities. 一旦参与者都专心投入活动之中,历险活动便成为了解团队,打破陈腐观念的有效工具,能够明确指出沟通合作的障碍,效率低落的原因,还能敞开心胸接受新观念、新角色和新的可能性。
Influence of group velocity mismatch on pulse trapping in photonic crystal fiber 光子晶体光纤中群速度失配对脉冲俘获的影响
The influence of frequency to the inter-electrode gap in high frequency group pulse electrochemical machining 高频群脉冲电化学加工中频率对极间间隙的影响
Metheds All patients having phacoemulsification with the Alcon Legacy 20000 Everest software were assigned to 1 of 3 groups ( the burst mode group, the pulse mode group and the continuous mode group). 方法用爱尔康公司Legacy20000珠峰系统超声乳化仪,将患者分为三组,分别采用爆破、脉冲和连续3种不同超声能量模式行超声乳化白内障吸除术。
Reversed Current and Pressure Wave in High Frequency Group Pulse Electrochemical Micro-machining 高频群脉冲电化学微小型加工中的反向电流与压力波
The experimental results indicate that high frequency group pulse power supply is obviously superior to direct-current and pulse power supply because of its improvements of machining precision and machining quality for micro-manufacturing fields. 结果表明,在微小型加工领域,采用高频群脉冲电源在改善加工精度,提高加工质量方面优于直流电源和脉冲电源。
The Mathematical Model of IGBT Reverse Spike Voltage in High Frequency Group Pulse Electrochemical Machining 高频群脉冲电解加工中IGBT反向尖峰电压的数学模型
Being modulated by a group of sharp pulse, UWB sends data through an ultra wide RF and shares in the spectrum with overlapping. UWB以超短周期脉冲进行调制,并使用超宽的RF频谱带宽传递数据,可通过重叠的原则共享已占用的频谱资源;
By using an acousto-optic programmable dispersion filter ( AOPDF) it can compensate the gain narrowing and group delay dispersion in ultra-short pulse laser systems. 介绍了一种利用声光相互作用对超短脉冲激光系统中的增益窄化和群延迟色散等进行补偿的装置&可编程声光色散滤波器(AOPDF)。其基本思想最初由法国的P。
Investigative Analysis of Biological Age in Sphygmogram of Healthy Group by ZM-ⅲ Intelligent Pulse Apparatus ZM-Ⅲ型智能脉象仪对健康人群脉图生物龄的调查分析
High Frequency Group Pulse Electrochemical Machining of Ultrathin Structural Parts 超薄结构件的高频群脉冲电解加工工艺研究
The mathematical model of balanceable inter-electrode gap in high frequency group pulse electrochemical machining is presented. Based on the model, the relationship between the main pulse frequency of supply power and the balanceable inter-electrode gap is discussed. 给出了脉冲电化学加工极间平衡间隙的数学模型,并据此讨论了高频群脉冲电化学加工中,电源主脉冲频率与平衡加工间隙的关系。
The Feedback Shift Register for Group Pulse Signals Generation 产生群脉冲信号的反馈移位寄存器
Mainly weak pulse, with some tendency to become rapid pulse in Group 3, and their pulse figure parameters show that h_1 and t of both left and right Cun is lower. 肺肾气虚型以虚类脉为主,并有数的趋势,脉图参数左、右寸均为h1、t降低;
In recent years, thanks to the development in quantum coherence and quantum information technologies, people have implemented the coherent manipulation of the group velocity of the light pulse. Moreover, one has achieved the short time storage of light pulse in medium and then releases it. 近些年来,随着量子干涉与量子信息技术的发展,人们已经实现了对于光脉冲实施群速度的任意操控,乃至于将光脉冲相干地存储在介质中,然后释放出来。
Wave Group Decomposition Ultrashort Pulse in Higher-order Dispersive Medium 超短光脉冲在高阶非线性色散介质中的波群分解法
It is indicated from the results that effected by the high frequency group pulse power, higher machining quality is obtained by choosing higher main pulse frequency. 结果表明,在高频群脉冲电源作用下,选择较高的主脉冲频率,可获得良好的加工质量。
The influence of parameters of a dual-pulses current, i. e., two group of pulse current with different height and width, for electrodeposition of Ni-P alloy on the catalytic activity to hydrogen evolution in alkaline solution was investigated. 研究了双脉冲电沉积法制备Ni-P阴极的工艺,以及在这些电极上析氢的催化活性。
Methods 62 patients were randomly divided into a group receiving magnetic field electric pulse plus point stimulation ( treatment group) and a group receiving routine electropuncture ( control group). Clinical comparative observation was carried out. 方法将62例患者随机分为磁场电脉冲配合经络穴位组(治疗组)和电针组(对照组)进行临床对比观察。
The balanceable inter-electrode gap in higher frequency group-pulse electrochemical machining 高频群脉冲电解加工的极间平衡间隙
In this paper, we derived an analytical solution of the pulsed beam propagating in the second order dispersive medium. Then, the GVD ( group velocity dispersion), pulse front and the space time coupling of the pulse are analyzed. 得到了脉冲高斯光束在均匀色散介质中传播的时域解析形式,由此讨论了脉冲的群速度色散、脉冲波前和时空耦合。
The phase velocity of the wake field is equal to the group velocity of the laser pulse in plasma. 这种尾波场相速度与激光脉冲在等离子体中传播的群速度相同。
Studies of university students 'consumption are helpful to identify changes in trend values of contemporary China, to understand the potential value of the core consumer group, to grasp the pulse of the future Chinese market. 对于大学生消费观的研究有助于发现当代中国价值观念的变动趋向,了解潜在核心消费群的价值,把握未来中国市场的脉动。
The width of ultrashort pulses is very narrow and the frequency spectrum is wide, so phase matching and group velocity matching must be met at the same time, otherwise group velocity mismatch can broaden the pulse width and decrease the conversion efficiency of second harmonic. 超短脉冲宽度窄,频谱范围宽,因此相位匹配和群速度匹配要同时满足,否则群速度失配会导致二次谐波脉宽展宽并降低谐波转换效率。
Clinical study of patients with sudden deafness were randomly divided into experimental group ( pulse acupuncture group), normal acupuncture group and blank control group, before and after treatment were compared and the accompanying symptoms of hearing. 临床研究部分则将突发性耳聋患者随机分为试验组(切脉针灸组)、普通针刺组及空白对照组进行观察,对比治疗前后听力情况及伴随症状。
Then, we describe slow light with group velocity, dispersion, and pulse distortion. 其次,对慢光的群速、色散、脉冲失真等指标做了说明。
Meanwhile, this article designs the Ignition method of compensation based on the unique executing agency, i.e. Group of bees pulse rocket engine, of the posture control of EKV. 同时,针对EKV特有的姿态控制执行机构&分布式脉冲火箭发动机组,设计了补偿点火算法。