最新刊期
卷 ， 期 4 ， 1982
- 摘要：An approach to frequency stability analysis using signal processing models （or systems） based on the stochastic signal processing theory is proposed, and the following are derived: unit impulse responses, tranfer functions, autocorrelations of the unit impulse responses, power or energy transfer functions of systems and subsystems; auto-covariances and power spectral density of the stochastic signals at every point in the systems; formulas of evaluating N sampling variances <σy2（N, T0, T）>or serveral main stochastic signals with the power law spectral type; and the theoretical, engineering and relative error formulas for the Allan variance.It is also pointed out that the Allan variance formulas in some literature [3,8,9-11] for calculating the flicker phase noise are improper.2|150|8更新时间：2025-12-08
- 摘要：A theoretical analysis of the laser resonator with a rectangular hollow dielectric waveguide and external reflector as well as some numerical results of that are presented in this paper. Special features of this method are as follows: 1. A complicated propagation process has been represented by transformation matrix. Thus, analysis of the lowest order mode of the complicated resonator is reduced to a problem solving for maximum eigenvalue from a complex matrix equation; 2. An approximate multi-mode theory is employed to describe more completely and accurately the mode construction, propagation characteristic of the cavity mode as well as the effects of higher order mode; 3. According to the diffraction principle and the theory of ray optics, a simple equation of the equivalent system is derived to replace the iterative diffraction integral to describe the propagation of the radiation field in free space outside the waveguide, so that the computation is much simplefied.More than ten figures are shown as a result of numerical computation for some typical resonators of CO2 waveguide laser and reflect the relations between the resonator geometry and mode characteristic from various aspects. The loss property of the fundamental mode in a matched resonator is identical with reference [3], and the characteristic of the cavity mode of an ideally matched resonator approaches that of the fundamental mode, and both are identical with the result from the single-mode theory. Emphasis is laid on the following subjects, such as: the effect of the light spot size at the waveguide entrance on the coupling efficiency; the dependence of mode properties on parameters of the spherical mirror; characteristics of the lowest loss mode composition and the mode selectivity; the behavior of the near field characteristic with the flat mirror system; the influence of the guide geometry and the optical constant of dielectric materials on the loss properties of resonator modes, ect. Some new ideas are suggested and some useful conclusions are drawn which are helpful in the research and development of gas waveguide laser.2|59|3更新时间：2025-12-08
- 摘要：This paper demonstrates that the solution of Maxwell’s equations in prolate spheroidal coordinates, when excited fields are not axially symmetric, can also be obtained by the method of separation of variables after introducing a good transformation, thus providing a solution of forced oscillation of a metallic prolate spheroid.2|227|1更新时间：2025-12-08
- 摘要：Switched-capacitor one-order and two-order sections may be used in various types of cascade filters. A leap-frog low-pass filter may be transformed into a band-pass or band-stop filter, if the integrators in the prototype filter are replaced by the corresponding switched-capacitor two-order sections. This paper presents a systematic design method for switched-capacitor one-order and two-order sections using bilinear transformation. In order to maximize the output dynamic range, the optimal circuit parameters are selected. The computation and comparison of the sensitivities for the two-order sections are discussed in detail.5|82|1更新时间：2025-12-08
- 摘要：<正> 中国电子学会计算机学会与北京电子学会于4月8～11日在北京召开了全国16位微计算机选型讨论会。来自17个省、3个直辖市75个单位的300多名代表参加了会议。其中,所长、厂长15人,高级技术人员25人,中级技术人员185人,管理干部及其他人员83人。 大会听取了关于8086、Z-8000、6800、LSI 11/23以及骊山微电子公司研制的77Ⅱ16位微计算4|12|0更新时间：2025-12-08
- 摘要：The behaviour in vicinity of resonances is considered for cylindrical cavity-backed aperture. It is pointed out that there exist three kinds of resonances in the cavity,i.e. two aperture-cavity resonances and one natural cavity resonance. The first aperture-cavity resonance is the most serious one. In this paper, the condition for suppressing aperture-cavity resonances is given as ξ<1. Numerical examples are given for copper cavity with narrow slot-aperture on 3m band and field distributions in the cavity are drawn.2|46|5更新时间：2025-12-08
- 摘要：The principle of forming digital multiple receiving beams in phased array radars is discussed, using the theory of digital signal processing. The digital phase distribution network method and FFT beam forming network method are suggested. A simulating test with the DJS-130 computer is made to verify the correctness of these methods. As an example, the antenna patterns of four adjacent beams without or with receiver noise have been calculated and shown in graphs. The possible applications of these methods in phased array radar systems are also mentioned in this paper.2|362|24更新时间：2025-12-08
- 摘要：The EMP is one of the most important phenomena of nuclear explosions.The main features of EMP in the vicinity of airbursts have been researched. On the instant of an explosion, there exist both radial electric field and radiated electromagnetic field even in the source region. But the radial electric field is dominant and the radiated field is comparatively weak. This region can also be called saturated electromagnetic field region, because the electric field reaches a certain maximum value which is not a function of the weapon yields but merely depends on the parameters of the enviroment. Beyond the region,the radial electric field diminishes to zero and then the radiated electromagnetic field becomes dominant. The conditions for creating the saturated field and the various EMP wave forms are discussed in this paper. On the basis of Gilinsky’s assumption and considering the actual gamma time behavior instead of the "jump" wave, the expanding dipole model may be suggested and can give the satisfactory explanations of the detail wave shapes in the early parts of EMP.3|134|5更新时间：2025-12-08
- 摘要：The equivalent input noise voltage, offset voltage drift, common mode rejection, power source rejection and other characteristics of a common source-common grid cascade amplifier is analysed in detail. This forms the basis oi a mass-produced operational module, with its offset voltage drift lower than 1μV/??CCCCC, low frequency noise voltage （0.01-1Hz,p-p） less than l.5μ, CMRR greater than 120 dB and PSRR greater than 100 dB.2|27|4更新时间：2025-12-08
- 摘要：The crystallization as well as the structure characteristics of ordinary CVD amorphous silicon films deposited over a temperature range of 550-750℃ have been investigated by TED, SEM and X-ray diffraction analysis. The crystallization temperature is given as 680±10℃, above which the deposited films are polycrystalline with an activation energy of growth 1.78 eV. and below which the deposited films are amorphous with an activation energy of growth 0.44 eV. Microcrystalline zone of pseudo amorphous structure exists in the transition process from amorphous to polycrystalline state.2|223|17更新时间：2025-12-08
- 摘要：<正> 中国电子学会计算机专业学会人工智能专业学组于1982年4月21～25日,在杭州市浙江大学招待所召开了成立大会和首次学术报告会。 人工智能,也称机器智能,它是计算机科学和数学、语言学、心理学、逻辑学以及有关应用学科相互渗透、相互交叉而发展起来的一种新兴的边缘学科。它着重研究如何提高计算机应用的灵巧性,即如何使机算机变得更聪明,使以往在运行中某些需要人的思维加以干预才能实现的应用,能够自行完成,以期把对计算机的应用扩展到一些新的领域中去。这是当前计算机应用研究领域中的一个前缘。它的基础理论研究,总的说来的围绕着如何把某类问题形式化,其目标则是如何在计算机上实现各种应用系统。在提交会议交流的论2|26|0更新时间：2025-12-08
- 摘要：A GaAs bipolar transistor utilizing heterojunction injection and ballistic movement is proposed, from which excellent performances can be expected. As a key to its successful realization, a method to eliminate harmful influence of the GaAs surface is also given.2|14|0更新时间：2025-12-08
- 摘要：A method of designing asynchronous sequential circuits is presented. The state assignment is single transition time （STT）, and with this method, a relatively simple set of next state equations can be obtained. This set of equations may be extracted directly from the assignment without using the usual Boolean minimization procedures.2|34|5更新时间：2025-12-08
- 摘要：<正> 中国电子学会线路与系统学会于今年5月上旬在江苏省无锡市召开了第四届年会,来自全国各地的134位代表参加了这次会议。会议收到242篇论文,在会上宣读了63篇。 学术交流分“模拟和数字滤波器,电子线路”,“电路理论、计算机辅助设计”,“系统理论、图论及其它”2|8|0更新时间：2025-12-08
- 摘要：This paper presents the analysis and design method of phase-type crystal-discriminator and experimental results.2|32|0更新时间：2025-12-08
- 摘要：The relation between the loop phase error of a PLL demodulator and the angle modulation on an input signal with noise present has been developed by adopting the Booton quasi-linearization method, the out-of-lock threshold in the sense of statistics being obtained. With a given operating threshold it is possible to get a general expression for the angle modulation limits of a noisy PLL. Applying the general expression to the noise-free case gives the results which are in agreement with the experimental ones presented in literature[1].2|62|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