逸出功

Tantalum is an ideal material for hot cathode. It has a low electronic work function, high melting-point, low evaporativity, and good mechanical, high-temperature, chemical properties. Especially in a PCVD ambient for diamond film deposition, its surface is transformed into tantalum carbide which has a much higher melting-point, lower evaporativity and better properties of electron emission.

钽是一种理想的热阴极材料，它具有电子逸出功低、熔点高、蒸发率小、良好的机械性能、高温性能、化学稳定性等优异特点，尤其是在辉光放电PCVD制备金刚石膜的特殊气氛中形成的碳化钽表面层，具有比钽更高的熔点、更低的蒸发率和更好的热电子发射特性。

5 And 1. 2-1. 3 respectively. The results showed that the graphite like carbon film had higher work function and lower secondary electron emission coefficient than those of DLC film.

总的来说，两者均具有较大的逸出功及较小的二次电子发射系数，后者的逸出功大于前者、二次电子发射系数小于前者。

The content and existence of surplus RE on the surface are the key point. It determines the thermionic emission performance and the work function of the materials directly.

表层超额稀土的存在和含量是材料热发射的关键，直接影响着材料的热发射性能和逸出功。

The power of its electronic transgression is 2.7ev, 40% less than that of pure tungsten electrode. With a low arc derivation voltage. It's easy to cause arc of high stability. Its current capacity is elevated 30% while its rate of burn spoilage drops low, making it more durable.

电子逸出功约2.7ev，比纯钨低40%，引弧电压低，易起弧，电弧稳定，载流能力提高30%，烧损率低，寿命延长。

We have come to the following conclusions:(1) the existence of the monoatomic layer is conditional, it depends upon the temperature, surface structure and purity of the substrate as well as upon the vacuum environment;(2) the appearance, and sometimes disappearance, of the emission peaks is a problem for further study, and it can not be explained simply by the monoatomic layer...

关于时而能、时而又不能观察到的电子发射峰值，是一个有待于进一步明确的现象，不能简单地用单原子层和偶极子理论来解释；3。吸附了外界原子或分子使电子发射增加的事实，并不是由于偶极矩降低了基底的逸出功，发射的电子来源于被吸附物质的价电子；4。实验证明&L&阴极是Ba-O-W系统，它既不是单原子层，也不是单分子层，也不适用偶极子理论。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。