基于Simulink大功率电子管放大器仿真

选用4616V4型四极电子管,单管输出350kW,采用两路并行放大链路,设计了一套输出功率350kW×2的大功率电子管功率源系统。基于四极电子管的恒流特性曲线及实验数据,拟合输出功率与阳极电压、输入功率的关系曲线,利用Origin软件拟合函数,建立数学模型,并利用闭环比例-积分(PI)反馈控制,稳定输出电压,通过Simulink仿真探寻最佳工作点,较低的阳极电压以及近饱和的输入功率既能有效增大工作频率,又能满足高功率输出的要求,仿真结果与实际联机调试数据对比,误差低于5%,根据仿真数据得到的结论与13点分析法一致,可以有效指导探寻最佳工作点。     

用电子管做等离子体诊断实验

用电子管代替气体放电管做等离子体诊断实验,分别使用X-Y自动记录仪和万用表进行测量,计算得出等离子体参量,并与使用放电管得出的等离子参量做比较,证明了用电子管代替气体放电管的可行性.     

邮票上的物理学史(74)--电子学

电子学是一门应用科学,用来研究和利用电子在真空、气体和固体中的运动及其和电磁波的相互作用,特别是制成各种电子器件,为信息、能源和材料科学服务．前面说过,电子学和无线电波的研究和应用是分不开的,二者合起来构成无线电电子学．我们分成了两节来介绍,前面已介绍过无线电,本节专门讨论电子器件的发展,一是因为内容大多,二是因为晶体管是在固体能带论和半导体物理学的指导下发明的,在凝聚态物理学之后来讲更合适．     

从电子器件的换代来看计算机的发展

 电子计算机的诞生与发展,极大地推进了现代科学技术的发展。从第一台计算机诞生到今天,计算机已经历了四代,而四代机的划分是以电子器件的换代为主体特征。电子管的发明和第一代电子管数字计算机（1946～1958年）1883年,美国发明家爱迪生（T.A.Edison,1847～1931）发现了热的灯丝发射电荷的现象,并被称之为“爱迪生效应”。1889年,英国著名物理学家汤姆孙（J.J.Thomson,1856～1940）解释了这种现象,并把带电的粒子称为“电子”,同年,英国伦敦大学电工学教授弗莱明（S.J.A.Fleming,1849～1945）开始认真研究爱迪生效应,并且于1904年研制出检测电波用的     

两种全晶体管超声波清洗器鉴定投产

上海超声波仪器厂,近来研制成功CQ50和CQ250两种全晶体管化超声波清洗器.经一些科研和工厂单位试用,效果良好;噪声小,效率高,耗电省.在上海市电子仪器设备公司支持下,于1982年12月通过鉴定,并批量投入生产. CQ50和CQ250超声波清洗器,采用两个功率晶体管作为超声频电源,转换效率高.和电子管式的     

用火焰检测电子管检测火焰的实验方法

介绍了采用新型传感元件GP-16火焰检测电子管实现非接触式火焰检测的方法。并给出了完成其功能的电路图．     

A novel 10-nm physical gate length double-gate junction field effect transisto

A novel double-gate （DG） junction field effect transistor （JFET） with depletion operation mode is proposed in this paper. Compared with the conventional DG MOSFET, the novel DG JFET can achieve excellent performance with square body design, which relaxes the requirement on silicon film thickness of DG devices. Moreover, due to the structural symmetry, both p-type and n-type devices can be realized on exactly the same structure, which greatly simplifies integration. It can reduce the delay by about 60% in comparison with the conventional DG MOSFETs.     

Magnetically Tunable Terahertz Switch and Band-Pass Filter

A novel design of a tunable terahertz switch and band-pass filter using liquid-crystal-filled photonic crystal waveguide is demonstrated. The effects of magnetic field on the photonic bandgaps and transmitting properties of a THz wave are investigated by using the plane wave expansion method and finite difference time domain method. The efficient photonic bandgap tuning is predicted such that the two-dimensional liquid-crystal-filled photonie crystal waveguide can serve as a switch and continuously tunable band-pass filter with controlling of the magnetic field.     

HCS-140碳硫仪故障检修

介绍了几例HCS-140高频红外碳硫仪故障检修方法.     

The pressure field in the liquid column in the tube-arrest method

We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining the theoretical analysis with the experimental observation to be a slightly varied version of water hammer. With relatively clean liquid, the magnitude of the tension peak generating the TSB is likely to reach of several millions Pa. It is also shown that the so generated cavitation bubble originating from the gas-containing bulk liquid is in ‘violent’ motion.