脉冲

In this article, the OH radials produced by positive and bi-directional pulse corona discharge in a wire-pla...

一、OH(A~2∑→X~2Π 0-0)自由基的发射光谱利用发射光谱技术在大气压下测量了在氮气、水蒸气混合气体中线-板式正脉冲、双向窄脉冲电晕放电产生的OH(A~2∑→X~2Π 0-0)自由基的发射光谱及在潮湿空气中正脉冲电晕放电OH自由基的发射光谱。

High frequency pulse tube refrigerator model based on physical mechanisms consider comprehensively working mechanism of pulse tube refrigerator.

基于物理机制的高频脉冲管制冷机模型全面考虑了脉冲管制冷机的工作机理，为高频脉冲管制冷机的优化计算提供了一个快速有力的工具。

First, the effects of magnetic RAM relaxation time and the rise-time of incident pulse signal on reflection signal are discussed, the relationship between the rise-time of incident pulse and relaxation time based on the energy of reflection signal is revealed. Then, the effects of magnetic hysteric, susceptibilities and saturation upon reflection signal are analyzed, the results reveal the reflection of RAM target and UWB signal design. In the meantime, dielectric relaxation time effect about dielectric RAM target is analyzed simply, and the effects of relaxation time and the width of incident pulse upon reflection signal are probed. Finally, a few RAM targets are measured in the chamber using the impulse radar experiment system which is developed by the team of anti-stealth impulse radar on Department of Electrical Engineering, National University of Defense Technology. The experimental results show the similarity of the rule of echos with the theory. From the compared results of different tagets, we concluded, compared with 15% wideband sinusoidal signal, the impulse signal has increased 10～12dB energy from the same loaded RAM target; this, in turn, shows the nonlinear effects of RAM to the echoes, and the potentiality of the impulse signal to RAM targets.

首先分析了磁性RAM的弛豫时间及入射脉冲信号的上升时间对反射信号的影响，从反射信号能量角度出发，给出了入射脉冲上升时间与弛豫时间的关系；接着分析了磁性RAM的磁滞特性、磁化率及磁化强度对反射信号的影响，给出了RAM目标辐射和有关UWB信号设计的一般性结论；其次，对介电RAM的弛豫时间效应作了简单的分析，探讨了介电弛豫时间及入射脉冲宽度对反射信号的影响；最后利用国防科技大学电子技术系&反隐身冲激雷达技术研究组&研制的冲激雷达实验系统，在微波暗室中对几种不同的RAM目标进行了测量，结果表明：其反射波形的基本规律与上述理论分析相一致；从各种不同目标回波的能量对比结果得出，涂覆RAM目标对冲激信号的吸收比15％带宽的正弦信号要小10～12dB，证实了RAM的非线性效应对回波的影响，也证实了冲激信号反隐身的潜力。

In chapter 3,we discuss the existence of solutions for impulsive differential equations with two-point boundary condition.

通过使用脉冲不等式和分析方法，得到了一阶脉冲微分方程周期边值问题新的比较结果，借助所给的新的上下解，结合单调迭代技巧，建立了一阶脉冲微分方程周期边值问题极值解的存在结果。

The technique problems such as quick charging of high voltage capacitor, uniform discharge in high pressure large aperture zone, uniform flow of high pressure gas, and laser resonator, high energy pulse output and high repetition pulse output, were solved by applications of ultraviolet preionization, two-circuit series and parallel discharge structure of graphite Ernst electrode, folded resonator that embodies super-thin water-cooled non-deforming mirror, closed circle direct cooling system of double loop and high-voltage high-current switch power supply.

采用紫外预电离双路Ernst石墨电极串并联放电结构、超薄水冷不变形镜折叠腔、双回路直冷式封闭循环流动系统和高压大电流快脉冲开关电源等技术，解决了高功率高压电容充电、高气压大体积均匀辉光放电、高气压高速均匀流场、激光谐振腔和高脉冲能量、高重复频率脉冲激光输出等技术难题。

Finally,the paper puts forward the prospect of laser-triggered surface flashover switch.

最后，指出对窄脉冲电压下的激光沿面闪络开关，激光脉冲与电压脉冲的同步是一个很关键的问题，有待深入研究。

The single a machine that should design to adopt serieses MCS-51s primarily conduct and actions main a measurement for, passing spreading feeling machine to the current of air measuring, its change is homologous pulse signal, this pulse signal through A/ D conversion with D/ A conversion after produce the certain electric voltage signal, will show the inceptive pulse signal a discharge for representing to come out at the same time.

而主要注重对其流量的检测并加以显示。该设计主要采用了MCS-51系列的单片机作为主要的芯片，通过传感器对燃气流量的测定，将其转变为相应的脉冲信号，这个脉冲信号经过A/D转换和D/A转化之后产生一定的电压信号，同时会将起初的脉冲信号所代表的流量显示出来。

By using Fourier Optics a theoretical model based on single-pass compression is set up for the study of the pulse-front distortion. For the first time the effects of the pulse-front distortion on the spatial-temporal properties of the output pulse from the compressors.

利用傅立叶光学方法，建立了一个基于单程压缩构型的研究脉冲前沿畸变效应的理论模型，首次分析不同种脉冲前沿畸变效应对于压缩器输出脉冲的近场时空特性的影响。

It is included the energy spectrum and angular distribution of hot electrons generated by ultrashort laser-solid interaction, the effect to electron behavior of electrical conductivity of target material, the hot electron activities and plasma characteristics in various plasma scale length, the rule of electron movement related to the high harmonic generation in gas, the excelled calculation about the condition of high harmonic generation, the study of electron spectrum and ion spectrum generated by Coulomb explosion in laser cluster interaction.

其中包括超短脉冲激光与固体靶作用中超热电子的能谱和角度分布，靶材料的电导率对电子行为的影响以及在不同的密度标长条件下超热电子和与电子相关的等离子体特征；超短脉冲激光与气体靶相互作用中与高次谐波相关的电子的具体运动规律和产生短波长高次谐波的优化条件；超短脉冲激光与团簇原子相互作用中通过对电子的隧道电离而引起的库仑爆炸等。

On the basis of analyzing the mechanism of the hydraulic pulse, the rock-breaking mechanism of themechanical cut-out hydraulic pulse is discussed by using transient flow theory, the working principle and its structural characters of SLPMC mechanical cut-out hydraulic pulse tool are introduced.

在分析水力脉冲产生机理的基础上，探讨了基于瞬变流理论的机械阻断式水力脉冲破岩机理，介绍了SLPMC机械阻断式水力脉冲工具的工作原理及结构特点，简单叙述了该工具在胜利油田进行的2口井的现场试验情况。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。