最新刊期
卷 ， 期 1 ， 1978
- 摘要：A new design of a UHF power divider is suggested, by which the power may be distributed to any N branches in any desired ratios. The equations used to find the values of the wave impedances of the dividing sections and the impedance-transforming sections as well as the isolating resistances are given. In these equations, an arbitrary constant coefficient is contained, which may be selected freely. Furthermore, the methods of finding the wave impedances of the branched coaxial strip lines used as the dividing line sections are also given.2|92|2更新时间：2025-12-08
- 摘要：The typified programming technique for numerical control, described in this paper, is established on the basis of characteristic analysis of geometric configurations and dimensions of any two-dimensional patterns. A great deal of facts have proved that through this typified technique the numerical control programming of complex, special and non-circular curve patterns can be efficiently solved by the mere use of common computing tools, instead of expensive general electronic computers.2|25|0更新时间：2025-12-08
- 摘要：A study of the low temperature epitaxy process for GaAs has been made together with evaluation of the quality of the epitaxial layers obtained. The surface morphology, growth rate, residual impurity level, electronic mobility deep impurity level and carrier concentration profile for low temperature epitaxy are discussed and compared with those for high temperature epitaxy. The results indicate that the low temperature epitaxy process is an acceptable method for the preparation of device quality GaAs layers.2|40|4更新时间：2025-12-08
- 摘要：This paper presents new ideas and methods for constructing the transfer function, solving the open-circuit impedance parameters, etc. The classical Darlington’s realization theory has been generalized to include arbitrary generator and load impedances （Non-Foster positive-real functions）. The previous researches on realization theory of reactance two-port networks are the special cases of this theory.From the theoretical point of view, the results presented in this paper are the general realization theory of reactance two-port networks. From the practical point of view, this theory extends greatly the range of applications.2|32|3更新时间：2025-12-08
- 摘要：This paper describes an ultraviolet photopreionized highpressure CO2 laser. This laser employs a cable-coupled, parallel-discharge preioniized circuit and a main discharge circuit, which share a common power supply. It has a number of advantages, such as less energy dissipation, good stability, simplicity of configuration and so on. This laser can be operated at 8-12 atm with a peak power output of about 20 MW. Continuous tuning over total frequency range of 100cm-1 on the P and R branches of 9.4μand 10.4μ vibrational-rotational bands of CO2 has been achieved. Preliminary studies of continuous tuning and frequency pulling are performed.2|40|13更新时间：2025-12-08
- 摘要：This paper describes the design and implementation of the core language in the software generating system NDHD as well as its application status. This system is based on the ideas of system programming language and bootstrapping technique. The essence of the system is the selfcompiler AC0 of the core language L0 （in 655 machine language）. By applying bootstrapping technique, the selfcompilers of the succeeding languages L1, L2, …? Ln may be automatically generated in turn. At present selfcompilers of the first and second generations have been successfully generated by this system. The results indicate that not only production rate has been increased by four times, but also compiler capabilities can be easily extended. The data structure, control structure, program structure, input-output components in L0 as well as the compiling algorithms used in AC0 have been briefly described2|19|3更新时间：2025-12-08
- 摘要：This paper presents a method of calculation of the noise figure of power travelling wave tubes which employ a conical Pierce gun to produce the electron beam. Under the assumption that the electron beam is single-velocity and one-dimensional, the transmission equation of space charge wave set up in the conical electron beam is derived and the process of noise impedance transformation is obtained. Theoretical calculations show that changing the convergence angle, the radius of curvature, the anode voltage and the length of the drift region can reduce the noise figure of a power travelling wave tube. Theoretical results presented in this paper are examined with the experimental noise figure values of a few of practical tubes.2|68|4更新时间：2025-12-08
- 摘要：<正> 中国电子学会代表团一行十二人,应电气电子工程师学会（IEEE）的邀请,由副理事长兼秘书长孙俊人同志率领,于今年五月五日至廾八日访问了美国。 这是我电子学会的首次访美,也是对IEEE去年十月首次访华的回访。代表团在美期间,访问了旧金山、洛山矶、华盛顿、波士顿和纽约五个城市,受到了IEEE总部及各地分部领导成员及电子学界同行的热烈欢迎和友好接待。美国国会参议员爱德华·肯尼迪和美国总统科学顾问普雷斯会见了全团人员。美国广大电子科学工作者和工程技术人员对我学会“积极开展国际间学术交流”表示欢迎,纷纷表示“在美国,人们强烈地希望了解中国,希望加强交往。”2|19|0更新时间：2025-12-08
- 摘要：Characteristic equation for boundary conditions of cylindrical systems with corrugated wall is solved and characteristic values for various modes of HE11-HE15, EH11-EH15, TM0.1-TM0.16 are obtained. A family of curves, which are easy to use, are plotted, and from them single-mode operation areas for HE11, EH11 and TM0.1, which are quite useful for mode-selection design, are found, Practice has shown, that they can provide valuable data to design high-efficiency feeds.2|48|8更新时间：2025-12-08
- 摘要：Some experimental results are described for Schottky barriers made on silicon by using barrier metals such as Zr, Ti, Ta, Mo, TaZr and MoCr. The preliminary experimental results have shown that the Zr-Si barrier has a very low barrier height and is suitable for fabrication of detector diodes. A MoCr-Si barrier treated at proper temperature is applied to the fabrication of an 8mm mixer diode, which has a high reliability and an overall noise figure of about 7dB.2|25|0更新时间：2025-12-08
- 摘要：this paper suggests that in the analysis of the complex phase locked loops all the components of a phase locked loop be treated, equivalently as a phase discriminator except the voltage controlled oscillator and the loop filter. This view is in conformity with the general principles of automatic control systems and convenient to analyze the problems of complex loops by making extensive use of the theory of typical phase locked loop. This paper gives the characteristics of equivalent phase discriminators in some complex loops, and therefore, it is possible to evaluate some of their performances. As an example of the applications of EPD method, the locking ability of various narrow band phase locked loops to each frequency component in the spectrum of an input signal is discussed, and some problems are clarified.2|42|0更新时间：2025-12-08
- 摘要：<正> ZnO:Zn由于它对电子的亲和能大于其发光中光的激活能,又由于它在真空解吸的条件下电导较高,“死电压”很低,因而能够被能量甚低、甚至零能量的电子激发发光。它的这一特性已在早年被用来制作荧光数码管,使得这种管子在数码显示中获得极为广泛的应用。最近它又被成功地应用于矩阵式多行字符显示。现在,我们的科研实践还表明它还能用来显示电视图象。由于它具有高达二十万N1的脉冲亮度,驱动电压低,驱动电流小,反应速度快和稳定可靠等优点,因而可能是实现平板电视的一条很有希望的新途径。2|14|3更新时间：2025-12-08
- 摘要：<正> 这是一种采用新配方的大功率电阻器。它具有高比功率（达1.6W/cm2）,耐高温（表面工作温度允许达500℃）,和较低电阻值（2Ω）的优点;作为大功率、耐浪涌、耐高温电阻器,它已受到用户的欢迎。下面是该电阻器技术指标、材料组成和生产流程的梗概。2|67|1更新时间：2025-12-08
- 摘要：<正> 目前干式光刻技术已取得了许多重要成果,但是唯独显影还停留在湿法阶段,仍是一道必不可少的关键工序。由于显影液对光刻胶薄膜的溶胀作用,胶膜图形总会有所畸变,胶膜致密性总会有所降低。线条愈细,负胶还会使线条出现一种类似向外抽筋的现象,正胶还会使线条断裂。这些对于光刻分辨率和针孔密度都是特别有害的,显影时留下的一层不易发觉的残膜,更会招致严重的恶果。2|46|2更新时间：2025-12-08
- 摘要：<正> 自1975年8月美国首次报导电子束泵浦惰性气体卤化物准分子激光器以后,引起了人们的重视。我们于今年年初研制了用高能电子束泵浦的XeF激光器之后,最近又用同样的激励手段成功地获得了KrF激光输出。3|21|0更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0