灯丝阴极

In electronics, a vacuum tube or thermionic valve or just valve, is a device generally used to amplify, switch or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.

真空管是一种电子设备，由抽真空的容器组成，它具有发射电子的阴极（旁热式是由灯丝加热，直热式则灯丝就是阴极）和工作时通常加上高压的阳极。阴极和阳极之间，自阴极算起，第一个电极称为栅极，再增加一个电极则称为帘栅极。

The good characteristics of the deflection system of electron gun can be obtained by optimizing the velocity and the location of emitting electron beam and by the aclinic emission of the electron beam, that can be achieved by making the end of the anode and the middle part of the cathode level.

研究结果表明：电子枪阳极板端点与阴极灯丝中心点保持水平可满足电子水平出射；非均匀分布的磁场对e型电子枪中电子束具有良好的聚焦作用；所设计的偏转聚焦系统在电子束流为50~100 mA时，束斑小于3 mm。

Methods Small focus and low power X-ray tube is chosen and cooled together with high voltage circuit in oil. The power supply of filament, high voltage for anode and controlling circuit are designed.

选择小焦点小功率 X 射线管，设计阴极灯丝供电电路，阳极高压电路和控制电路。

In ancient times, when vacuum tubes were still in use, the A battery (often about 6 volts) heated the filament or cathode to boil off electrons, the B battery, positive with respect to the cathode, sucked the negative electrons to the plate, while the C battery, a few volts negative with respect to the cathode, tended to repel the electrons back toward the cathode.

古时候，还在使用真空管时，A电池（通常为6V）通过加热灯丝或阴极来蒸发电子，B电池，正极连接阴极，将负电子吸引到极板上，而C电池，只有几伏，负极连接阴极，将电子击回阴极。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。