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直流发射
相关语句
  dc emitting
     DC emitting characteristics of single crystal LaB_6 thermionic cathode
     单晶LaB_6热阴极直流发射特性实验研究
短句来源
     Following experiment falls into two successive phases, which explores experimentally the DC emitting characteristic of single crystal LaB_6, and experiments on the design parameters.
     进行了两轮实验,第一轮为获得LaB_6热阴极直流发射特性数据,第二轮借助实验考查设计是否达到预期指标;
短句来源
     A diode-type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB_6 thermionic cathode.
     实验利用二极管型电子枪研究了单晶LaB6热阴极的直流发射特性。
短句来源
     A diode-type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB6 thermionic cathode. The emitting area is a planar 2mm-diameter , achieving transmitted currents up to 175 mA and the current density 5.57A/cm2. Comparing the measured current with Longo theory, which is accurate and applicable in the regime of practical operation.
     实验利用二极管型电子枪研究了单晶LaB6热阴极的直流发射特性,阴阳极间距5mm,从φ2发射体上测得175 mA直流束流(阴极温度~1870K、阴阳极电压6.5kv、空间电荷限制状态),电流密度为5.57A/cm2, 并用Longo方程拟合,比以往单纯用Child或Richardson-Dushman公式分析更符合实际。
  “直流发射”译为未确定词的双语例句
     The emitting area is a planar 2 mm-diameter, achieving transmitted currents up to 175 mA and a current density of 5.6 A/cm2. Comparing the measured current with fit result by Longo equation, Longo equation fitting is more accurate than the other methods, and applicable for practical operation.
     阴阳极间距5mm,从直径为2mm发射体上测得175mA直流束流(阴极温度约为1870K、阴阳极电压6.5kV、空间电荷限制状态),电流密度为5.57A/cm2。 采用Longo方程拟合直流发射电流,该方法比以往单纯用Child或RichardsonDushman公式更符合实际。
短句来源
     The heating power for the LaB_6 cathode was only 173 W when the temperature of LaB_6 cathode was as high as 1 873 K,in which an electron beam source was employed as the heater.
     采用电子束轰击的方式加热LaB6发射体,当阴极温度为1 873 K时,加热功率为173 W,直流发射电流密度达到40A/cm2。
短句来源
     DC current density of the dispenser cathodes coated with Os-W alloy and Os-W/Re were compared. It is found that the cathode with Os-W/Re shows better emission performance than the cathode with Os-W alloy.
     通过对Os-W双元合金膜钡钨阴极和Os-W/Re双层膜钡钨阴极发射特性的比较,发现Os-W/Re双层膜阴极的直流发射性能好于Os-W合金膜阴极.
短句来源
     Having knowledge about character data of DC operating and the effect on emitting ability of vacuum, then there is experimental foundation for electron gun design and operation.
     第一轮实验详细研究了单晶LaB_6热阴极的直流发射特性,获得了直流运行状态的发射特性数据(不同温度下的Ⅰ-Ⅴ特性曲线),引入Longo公式,并用该公式解释实验数据,还观测了环境(真空度和杂质)对发射能力的影响,为枪设计及运行提供了实验依据。
短句来源
     which is similar to pressed the Ba-W cathode. Although operating temperature is only 760 ℃,this new cathode can obtain emitting current density (DC) 3 A/cm2 .
     该方法能使阴极工作温度在只有 760℃条件下 ,却能支取直流发射 3A cm2 高电流密度的氧化物阴极。
短句来源
  相似匹配句对
     Direct Current Arc Atomic Emission Detected by a Handheld CCD
     微型CCD-直流电弧原子发射光谱仪的研制
短句来源
     Failure to Launch
     发射失败
短句来源
     Basic Direct Current Circuits
     直流电路
短句来源
     A Laser DC Power Supply Using VICOR Power Modules
     基于VICOR功率模块的激光发射直流电源
短句来源
     Launch window
     发射窗口
短句来源
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In this paper the relationships between small-signal h-parameters and elements of the natural equivalent circuit of the common emitter configuration of junction transistors are studied. From experimental results of h-parameters of two typieal alloyed PNP transistors (one 2N104 and one п-6 transistor) the relationship of h-parameters and elements of natural equivalent circuit vs operating frequency and d. c. operating condition (d.c. emitter current and d.e. collector voltage) are evaluated. Results thus obtained...

In this paper the relationships between small-signal h-parameters and elements of the natural equivalent circuit of the common emitter configuration of junction transistors are studied. From experimental results of h-parameters of two typieal alloyed PNP transistors (one 2N104 and one п-6 transistor) the relationship of h-parameters and elements of natural equivalent circuit vs operating frequency and d. c. operating condition (d.c. emitter current and d.e. collector voltage) are evaluated. Results thus obtained ace then compared with results obtained from analysis based on calculations using physical constants of the transistor. The explanation of the behavior of the reverse open-circuit voltage amplification factor, μb0, of the common emitter circuit is given in detail. Characteristics of μbo and properties of h22 (the output admittance with input open) are correlated. This paper gives complete information about h-parameters and natural equivalent circuit of two transistors, serving as an important reference for both device men and research workers on transistor circuits.

本文研究面结合型晶体管共发射极线路的小讯号h参数与自然等效线路中元件的关系。根据两种合金管(2N104及Ⅱ-6晶体管)h参数的实验结果求出h参数与自然等效线路元件随频率及随直流运用状态(直流发射极电流及直流集电极电压)的相互关系。对实验结果与根据晶体管物理构造分析计算的结果进行了比较。对开路反向电压放大系数μ_(bc)的现象给予详细分析,并求出μ_(bc)与开路输出导纳h_(22)的相互关系。两套晶体管的h参数及自然等效线路的完整资料可供晶体管器件设计及线路研究者的使用。

This paper emphatically introduced a new manufacturing method of oxide coated cathode.which is similar to pressed the Ba-W cathode.Although operating temperature is only 760 ℃,this new cathode can obtain emitting current density (DC) 3 A/cm2 .

着重介绍类似于压制钡钨阴极的一种新型氧化物阴极的制作方法。该方法能使阴极工作温度在只有 760℃条件下 ,却能支取直流发射 3A cm2 高电流密度的氧化物阴极。

A diode-type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB_6 thermionic cathode. The emitting area is a planar 2 mm-diameter, achieving transmitted currents up to 175 mA and a current density of 5.6 A/cm2. Comparing the measured current with fit result by Longo equation, Longo equation fitting is more accurate than the other methods, and applicable for practical operation. The circumstance has an effect on the emitting ability of cathode, when the vacuum is below...

A diode-type electron gun is used to investigate the DC emitting characteristics of a single crystal LaB_6 thermionic cathode. The emitting area is a planar 2 mm-diameter, achieving transmitted currents up to 175 mA and a current density of 5.6 A/cm2. Comparing the measured current with fit result by Longo equation, Longo equation fitting is more accurate than the other methods, and applicable for practical operation. The circumstance has an effect on the emitting ability of cathode, when the vacuum is below 7×10 -4 Pa, the current density apparently decreases. The C and O in the surface of the emitter can increase the work function. Aggredation and diffusion of LaB_6 to pyrolytic graphite make the resistance of heater lower. Experimental results show that DC emitting current density is lower than pulse emitting due to the finite diffusion velocity of atom La and the surface adsorption of remainder-gas.

实验利用二极管型电子枪研究了单晶LaB6热阴极的直流发射特性。阴阳极间距5mm,从直径为2mm发射体上测得175mA直流束流(阴极温度约为1870K、阴阳极电压6.5kV、空间电荷限制状态),电流密度为5.57A/cm2。采用Longo方程拟合直流发射电流,该方法比以往单纯用Child或RichardsonDushman公式更符合实际。实验还观测了阴极工作环境和表面状态对直流发射的影响,当真空度低于7×10-4Pa时,阴极发射能力逐渐下降,阴极表面碳、氧污染使发射体功函数升高。长时间加热后,石墨上会蒸镀LaB6,由此会造成热子电阻的下降。分析表明La原子补充不及时和表面气体吸附是影响直流发射能力的主要因素。

 
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