电子脉冲

we use magnetron sputtering to deposit Al-AlN particle film as SED's electron-emitter. The Cr-Cu-Cr electrode was prepared by electron beam vaporize deposition. The voltage used to electroform the cracks are periodic trigonal wave and the breadth of the voltage are increasing gradually.

文章中采用铝-氮化铝薄膜材料作为SED器件的电子发射层，采用磁控溅射的方法镀电子发射层，采用电子束蒸发的方法镀铬-铜-铬材料作为电极；电形成过程中采用电压幅值恒定、周期性重复的脉冲和电压幅值渐增的电压脉冲作为电极电压。

Deducing course of the equation of electronic pulse frequency on electronic cam is narrated in this article,at the same time parts of controlling program are been supplied on electronic cam.

论述了电子凸轮通电脉冲频率关系式的推导过程，给出了电子凸轮的部分控制程序框架，揭示了电子凸轮通电脉冲频率与凸轮从动件运动规律之间的内在联系，为实现电子凸轮从动件的速度控制提供了理论依据。

In this paper the pulse measurement used to measure the pulse ionization electron current for electron impact ion source of time of flight mass spectrometer was discussed, the shortcoming of average current measurement was analyzed, and the practical measuring circuit of the pulse was given.

本文讨论了脉冲测量技术在飞行时间质谱计电子轰击离子源中测量脉冲离化电子流的应用，分析了平均电流测量方法测量脉冲离化电子流的局限性，给出了实际的脉冲测量电

The threshold of lithium tantalite under single-shot is found to be 1.84J /cm 2 and the avalanche rate was determined to be 1.01 cm 2 /J by calculation. We found that avalanche dominates the ablation process, while photoionization serves as a free electron provider.

在800nm飞秒激光脉冲作用下，钽酸锂晶体单脉冲烧蚀阈值为1.84 J /cm 2；在此基础上，我们通过建立钽酸锂晶体中导带电子密度演化微分方程，并数值求解，得到了钽酸锂的碰撞电离速率系数为1.01 cm 2 /J ，并得出在钽酸锂表面烧蚀中，光致电离提供种子电子，雪崩电离起主导作用的结论。

By comparison between SMM HXRBS observation and ground observation of Hα and CaIIK lines, especially through the combined study between SMM HXRBS observation and chromospheric flare models, the results show that: in the initial stage of impulsive phase, there is a correlative relation betweem Hα line intensity and hard X-ray emission; different spike in hard X-ray flux curve represents the burst at different location; the energy taken by non-thermal electron beam is larger than the radiative loss in chromosphere; for the flare studied here, the chromospheric evapporation is explosive; if the chromosphere is in balance between electron beam bombardment and radiative loss, the column mass density at the top of chromospheric flare model can not be taken as measure from the source of electrons and then the total material between the source of electrons and the top of chromosphere can be estimated.

通过一个具体耀斑的SMM HXRBS观测结果与同时基于地面得到的Hα和CaⅡK可见光谱观测结果对比，特别是将硬x谱观测结果与色球半经验模型联立研究，结果显示出：在脉冲相上升段，硬x发射与Hα辐射之间存在对应关系；硬x线光变曲线中不同脉冲爆发分量不太可能起源于同一位置；硬x辐射所反映的高能非热电子总携带能量大于色球总辐射损失；对所研究的耀斑而言，其色球蒸发过程是爆发性的；在详细比较了非热电子色球总沉积和色球辐射损失的基础上，指出半经验模型中色球顶部柱数密度不能看成是从非热电子源度量的，从而估计了色球顶部到非热电子源之间的总物质。

The results of study showed that there were many interference signals in discharge detection signal for the DC feeder cable, which determined by the special electric wiring of the cable. The results of laboratory simulation and field measurement showed that the main interferences involved discharge pulse generated by other equipments of the traction substation, white noise, rectifying pulse generated by the rectifying equipments, current pulse generated by the braking of the locomotive,stochastic pulse signal, and narrow-band signal generated by electric equipment.

研究结果表明直流馈出电缆的电气接线以及负荷特点决定了其放电监测中存在大量的干扰信号，干扰信号包括白噪声、交流侧放电脉冲、直流侧其它设备的放电脉冲、整流装置产生的整流脉冲、机车启动制动产生的电流脉冲、随机性干扰脉冲以及其它电子设备产生的周期性窄带信号。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state. It is cheap and can be combined with the comb laser system in my laboratory.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁，其优点在於自制的外腔雷射之费用非常便宜，也有不错的输出功率，同时在实验中我利用市售的电子零件制作了一台脉冲产生器，可控制输出的频率、脉冲宽度以及相对的相位，且可同时控制四套需要TTL脉冲控制的系统或仪器，优点除了便宜之外，也非常稳定；为了隔绝磁场，利用了磁场隔绝金属箔，我也在实验室中建立了一组气体放电系统，其系统可以用脉冲产生器来控制开关时序，最后，我建造了一个氦原子能阶的量测系统，而且费用低廉，可与本实验室的另外一门研究光梳雷射系统做结合。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁，其优点在於自制的外腔雷射之费用非常便宜，也有不错的输出功率，同时在实验中我利用市售的电子零件制作了一台脉冲产生器，可控制输出的频率、脉冲宽度以及相对的相位，且可同时控制四套需要TTL脉冲控制的系统或仪器，优点除了便宜之外，也非常稳定；为了隔绝磁场，利用了磁场隔绝金属箔，我也在实验室中建立了一组气体放电系统，其系统可以用脉冲产生器来控制开关时序，最后，我建造了一个氦原子能阶的量测系统，而且费用低廉，可与本实验室的另外一门研究光梳雷射系统做结合。

The transit time and gain characteristics of electrons which travel in the micro-channel plate gated by picoseconds high voltage pulse were simulated.

对皮秒高压脉冲驱动下微通道板中电子的渡越时间特性和增益特性进行了数值模拟，在电压脉冲波形分别为高斯形、三角形和梯形时，得到了电子渡越时间与电压脉冲宽度、幅度的关系曲线。

The transit time and gain characteristics of electrons which travel in the micro-channel plate gated by picoseconds high voltage pulse were simulated. The curves of the transit time versus the voltage pulse width and the voltage amplitude are obtained when the waveforms of the voltage pulse are Gauss, triangle and trapezoid.

对皮秒高压脉冲驱动下微通道板中电子的渡越时间特性和增益特性进行了数值模拟，在电压脉冲波形分别为高斯形、三角形和梯形时，得到了电子渡越时间与电压脉冲宽度、幅度的关系曲线。

He knows that he's one of the mostdominant players in the NBA right now.

我知道他现在是联盟里最有统治力的球员之一了。

Using analysis method of BCG , the dissertation analyzed the management of voluntary service organizations .

利用BCG分析方法对我国的志愿服务组织管理进行了分析。