热阴极

For PPM, the magnetic field distribution and the ripple rule of electron beam in periodic focusing magnetic field is studied.

分析了阴极电子初始热速度对电子注成形和电子注质量的影响以及栅控电子枪的设计问题。

The carbon based materials have low electron affinity even negative electron affinity,and have the good ability of eradiating electrons in electric field.

其中非晶碳膜具有好的化学稳定性和热稳定性、高的熔点和热导率、小的介电常数、大的载流子迁移率和高的击穿电压，是一种很有前途的场发射冷阴极材料。

Such an assumption is not suitable to a silicon emitter under certain field emission current due to the high electric and thermal resistance of silicon.

对于硅锥阴极，由于其电导率和热导率都远小于金属，在一定的发射电流下，等位、等温假设存在明显缺陷。

It has no direct influence on the deposition of diamond films, but is a key region for the sustain of high current glow discharge.

在阴极的表面上，由于正离子轰击的二次电子发射和热电子发射两个过程，共同产生了初始电子。

Aring; of nanometre LaOx particle . On the basis of the results of the previous chapters , a new thermionic emission mechanism was put forward.

薄膜"发射新观点，解释金属薄膜型阴极的热电子发射机理，更深入地揭示热电子发射的内在规律。"

At last, arc reignition characteristic is defined for multiple-narrow slot chamber, and the mechanism of arc reignition process is analyzed. A mathematical model which forecasts the arc reignition process is improved for the first time by combining the striking theory of cathode layer with"black box"model for forecasting arc thermal reignition.

最后，通过试验确定了多纵缝陶土灭弧室中电弧重燃特性，对其机理进行了研究，并首次将阴极层击穿理论和预测电弧热重燃的黑盒模型相结合，建立了模拟陶土灭弧室中弧隙由电击穿到热重燃过程的电弧数学模型。

Adopting cathode protection of the zinc materials as an effective protection method, which already applied more and more in many field. For example, Hot-dip galvanisation, galvanization, electric arc spray zinc 、sherardizing, etc. But that method are with lots of shortcomings. For example, hard to apply

采用锌材料阴极防护的方式，作为一种有效的钢铁防护手段，已经得到越来越多的应用，诸如热浸镀锌、电镀锌、电弧喷锌、热喷锌等工艺手段，但鉴于这些工艺存在施工难度大、环境污染重、能耗高、锌层受损难修复等弊端，使得发展受限。

The carbonizing temperature, carbonizing time and the pressure of benzene (C6H6) are the decisive factors.

结果表明：在1723K，苯的压强为1.5×10-2Pa，碳化6min后Mo-La2O3阴极碳化度达到19.7%，碳化层为疏松多孔的Mo2C组织，有利于阴极热电子发射。

The mass and energy change speed of the TiB2 coating paste for aluminum electrolysis during its solidification and carbonization process was studied by the DTG and DDTA, and a reasonable heating program of solidification and carbonization was established. On this basis, the effect of heating program on the properties of TiB2 cathode coating was investigated.

摘 要：采用DTG， DDTA等热分析手段，研究了高温固化、炭化过程中，铝电解用TiB2阴极涂层糊料的质量和能量的变化速率，制定了涂层的变速固化、炭化升温制度；在此基础上，研究了升温制度对TiB2阴极涂层性能的影响。

Aring; of nanometre LaOx particle . On the basis of the results of the previous chapters , a new thermionic emission mechanism was put forward.

薄膜&发射新观点，解释金属薄膜型阴极的热电子发射机理，更深入地揭示热电子发射的内在规律。&

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。