Standard practice for definition and determination of thermionic constants of electron emitters 电子发射极的热离子常数定义和测定的标准实施规范
Standard practice for testing nitrogen phosphorus thermionic ionization detectors for use in gas chromatography 气相色谱法用氮磷热离子电离探测器测试的标准实施规程
Scandate cathode has outstanding properties of high emission at low work temperature . it ’ s the only thermionic cathode which can suffice to the development of new electronic device ’ s requirement 含钪扩散阴极具有极其优异的低温高电流密度的电子发射的能力,是目前唯一能满足新型电子器件发展要求的热阴极材料。
All of that changed back in the thermionic valve or " vacuum tube " days with the introduction of the ibm s 360 line of computers , in 1964 . suddenly , code didn t have to be thrown away and reimplemented every time you bought a new computer 这种情况的变化要回溯到1964年引入ibm s / 360产品线的电子管年代:突然之间,我们不需要每次新买一台计算机时都丢弃原来的代码并重新设计代码了。
With the development of high power microwave tube , the theoretical and experiment investigation of the high performance cathode have been conducted . the research work includes how to prepare the high performance cathode and the effect of the based metal on the cathode emission , the measurement of the inner and surface fine structures of the cathode , the discussion of emission mechanism of thermionic cathode . after a lot of experiment , we finally determined the cathode preparation with an excellent emission 为了适应大功率微波管的发展,本文展开了对高性能(大电流密度、长寿命)阴极的研究,研究工作包括阴极制备工艺、钡钨阴极基金属对阴极发射性能影响、以及钡钨阴极基底内部结构无损检测及表面形貌检测、钡钨阴极发射机理探讨及应用四个方面的实验和理论的研究。
This project which is based on the demand of increasing the electron tube ’ s qualities totally and reducing the manufacture cost has done a large amount of investigative work as follows to improve and perfect the technologies for the important part of electron tube manufacture ? the grid surface processing : on the surface processing of the molybdenum grid , the primary purpose is to reduce thermionic emission and secondary electronic emission of the grid . by the constantly experiment and grabbling the different technology routes , we have successfully developed these new technologies on the tac and zrc electrophoresis and electroplating platinum black of the grid , and made its surface cladding quality very stable and reliable 本课题是基于整体提高电子管的质量和降低生产成本的要求,对电子管生产中的重要部分? ?栅极的表面处理技术进行改进和完善,主要在以下方面进行了深入研究:在钼栅极表面处理方面,主要为实现降低栅极的热电子发射和二次电子发射,通过不同工艺路线的不断试验和摸索,成功开发出栅极电泳tac 、 zrc和电镀铂黑的新工艺,使栅极的涂覆质量稳定可靠。
Least square method is used to eliminate linearity errors of system as result of asymmetric illumination and fitting . averaging method of neighborhood and medium filtering method are used to effectively overcome thermionic noise as result of courses of image transferring , gathering and quantization and so on 对由于光照不均以及安装等存在的系统线性误差,采用最小二乘法线性拟合加以消除;对由于图像采集、传输、量化过程中产生的热电子噪声,利用了邻域平均和加权中值滤波方法来有效地减小。
However , the most commonly used x - ray sources didn " t change much no matter in structure or theory , still using thermionic cathodes as electron sources . such conventional x - ray tubes have some defaults , such as big volume , low frequency response , demanding for supply to cathode that was also brittle 目前使用的x光源的基本特点是采用热电子发射形式即采用热灯丝作为电子发射源,在高压加速下轰击阳极产生x射线,这样的光源体积较大,需要加热阴极的电源,且对频率响应慢。
As a nondestructive technique to measure the inner fine structure of the cathode , the ict has the unique advantage . we discussed the emission mechanism of thermionic cathode , and tried to explain the excellent performance of mixed metal cathode by richardson formula and muller ' s computational model 4 )就当前钡钨阴极发射机理的两个主要理论模型作了自己的探讨,并初探了钡钨阴极中钡的供应机制及发射寿命预测的问题,而且用理查逊公式的推导和muller计算机模拟法解释了混合基钡钨阴极的优良性能。