最新刊期
卷 ， 期 6 ， 1982
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A New Method for Judging whether a Polynomial of Degree k over GF（2m） Has k Distinct Roots in GF（2m）
摘要：In the complete decoding of binary BCH codes, it is very important to judge whether or not a polynomial of degree k over GF（2m） has k distinct roots in GF （2m）[1]. This paper presents a new method which can be used for all k and m. This method requires only O（m·k2） times of addition or multiplication over GF（2m） to judge whether or not a polynomial of degree k has k distinct roots in GF （2m）. In particular, when k = 2, this method is equivalent to judgement for tr（σ2/σ12） = 0.2|20|0更新时间：2025-12-08 - 摘要：Along with the development of software engineering, modularization has become an important trend in programming. This paper discusses some issues on the module-design in programming languages. We focus our attention on the following points: Viewpoints for defining modules, classification of modules, representation of interface between modules, constituent parts of module bodies, scope and visibility rules, and module declarations in the system programming language XCY-2.2|37|1更新时间：2025-12-08
- 摘要：<正> 中国电子学会信息论专业学会主办的这次学术讨论会于1982年9月16至20日在北京举行。 会议收到论文37篇,出席的代表共53人。 会议由程民德教授主持,他指出,自1980年初在广州召开“Walsh函数应用讨论会”以来,在理论和应用方面都取得了一些进展;强调今后要踏踏实实地做工作,不能随风倒。胡征教授和苏维宜讲师分别做了2|31|0更新时间：2025-12-08
- 摘要：In this paper, a linear bounded automaton is used to describe the reconfiguration of microprocessor multiple-modular redundancy system. Some mathematical modes of non-stuck failure and correlative failure are proposed, so that the reliability of such systems can be analyzed. It is pointed out in this paper that （ 1 ） the stuck-liked failure rate of modular isand （ 2 ） the correlative failure rate of 1-modulars isA five-modular system with reconfiguration is used as an example to compute the reliability of the system.2|24|0更新时间：2025-12-08
- 摘要：<正> 几年来,贵州凯里国营宇光电工厂对耦合腔行波管的研制和试用方面作了大量工作。他们从理论计算、制管工艺,抑制自激振荡方面进行探讨,找到了有效的抑制方法,取得了较满意的结果。成功地研制出了X波段水冷式周期永磁聚焦耦合腔行波管（见图1）,其输出功率大于25kW,瞬时带宽达12％,增益大于32dB、工作比为0.5％。后又根据用户要求、研制出更高频率的风冷式耦合腔行波管系列（见图2）,其输出功率分别为10kW和15kW,瞬时带宽为10％、增益大于33dB、工作比为1％。2|54|0更新时间：2025-12-08
- 摘要：the TM-mode cyclotron maser instability for a hollow relativistic electron beam propagating parallel to a uniform axial magnetic field is investigated in this paper. By the method of local field expansion, the maser dispersion equation has been obtained within the framework of linear Vlasov-Maxwell equations, and the maser dispersion equation has been calculated using a digital computer. The cyclotron maser mechanism for TM-modes has been analysed. It is shown that the azimuthal bunching of electron is caused by the relativistic effect and the energy exchange between waves and bunched electrons results mainly from interaction between axial electric field and axial velocity of the electron beam. When wave group velocity Vg equals electron axial velocity V, the system remains stable. Axial bunching and non-relativistical instability are also discussed.2|25|7更新时间：2025-12-08
- 摘要：In analysing the capability of the heat dissipation of the helical slow wave structure elastically （or expansively） supported by round dielectric rods, two difficulties are encountered: one is how to calculate the contact area and the other is how to determine the interface thermal resistance. So far only very few papers have dealt with this subject.An attempt is made to solve these two difficulties in this paper. A model is constructed. The formula related to the distorted force with the interference is derived. The contact area between the rods and the helix （or the barrel） can be calculated using the analytic results of elastic mechanics. As a result of the analysis, it is believed that the interface thermal resis tance is actually caused by the reduction of the effective contact area due to a bad contact. Therefore it can be taken into consideration by introducing an area correction factor.Various factors, such as the geometric size, the physical properties of the materials, the interference and the expansive correction, are taken into account in the computer programming and a lot of calculations have been done.The theoretical calculation is in close agreement to the experimental results. Some useful data for the practical design of heat dissipation are obtained.2|72|20更新时间：2025-12-08
- 摘要：Starting with the relativistic motion equation of electron, we have derived both the nonlinear oscillatory equation and the coupled equations on a slow time scale which describe the interaction between electrons and wave, with a cylindrical cavity model adopted. The numerical simulations of the nonlinear interaction have been made for two different magnetic fields. The electron trajectories and their distribution in phase space are plotted. The results obtained elucidate the nonlinear beam-wave interaction processes and the electron bunching features in various magnetic fields.2|32|2更新时间：2025-12-08
- 摘要：; This paper presents a method, called the standard-transformation and direct-plott ing method by the author, that utilizes the standard transformation of random variables to unify all kinds of control charts to a "universal control chart" with limits; UCL = 3, CL = 0, LCL=-3, and uses a direct plotting table or curves easily prepared before to relieve the workers from any calculation when they plot in the charts daily. Apparently, this method is very convenient in practice.In the cases that the size of the sample is not a fixed value, the limits of the current x, x, p and u control charts are concave-convex in shape, and therefore it is not only inconvenient to plot them but also difficult to judge if there are assignable causes. As to the pn control chart, because its central line is a function of n, we have to give it up in the n-var-ying situations. But the method proposed by this paper can avoid the drawbacks mentioned above, and increase the accuracy of alarm of the control charts, thus wide applications are ensured.2|44|7更新时间：2025-12-08
- 摘要：By practical analysis and calculation of an existing solid-state phased array radar, this paper derives a mathematical model of the reliability of the antenna array composed of dependent units constructed in five amplificative layers, and accounting for the in fluence of the final power accumulative network. Using expanding methods, it is not difficult to derive the mathematical model of the reliability of the antenna array with any amplificative layer. When the power dispersive and accumulative network of the antenna array and the combined power source can not be included in the assumed amplificative unit, it may be taken as a new layer in construction. The formulas derived thereby are all applicable to analyzing and designing the redundancy of the antenna array unit of the solid-state phased array radar.2|83|6更新时间：2025-12-08
- 摘要：Some formulas for ferrite tensor permeability in both demagnetized state and partially magnetized state are derived, which is based on the statistical theory on domains, and these theoretical formulas show good agreement with the experimental results. A concept of eigen line-width （or effective line-width in demagnetized state） is proposed, and the condition to avoid zero-field loss peak is presented. It is shown that YCaV-In substituted and YIG-Al substituted possess lower eigen line-width and are low-loss microwave ferrite materials.2|183|6更新时间：2025-12-08
- 摘要：The wall voltage is first expressed by a Fourier series, and an equation of electron motion in AC plasma display cell is then established. The expression of firing condition, dielectric constant and electrical conductivity of AC plasma display cell can be derived from the equation’s solution. Computed results show that the dielectric constant of a cell increases when the cell discharges most intensively, a new explanation why the cell capacitance increases at the most intensive discharges. It is theoretically proved that the discharge of the cell obeys Paschen’s law. Experimental and theoretical values are in good agreement.2|30|3更新时间：2025-12-08
- 摘要：: The purpose of this comprehensive review is to trace some problems of the theoretical analysis of modified dual reflector antenna and to emphasize the approximativeness of some methods. The paper considers the problems of engineering design for shaping dual reflector antenna, and places some emphasis on the problems of the monopulse Cassegrain antenna using optically shaping reflector approach.2|48|1更新时间：2025-12-08
- 摘要：The D/A and A/D conversion based on floatingpoint number proposed in this paper is an extension of the existing D/A and A/D conversion. Its principle, implementation, accuracy, characteristics and scope of application are discussed, and an example is given of the realization of such conversion on Microcomputer System 14500.2|32|0更新时间：2025-12-08
- 摘要：The detection performance of the generalized sign （GS） detector and its two simplified schemes in Weibull clutter for a finite number of pulses is studied through a Monte Carlo computer simulation. A large number of quantitative results are given and the effects of the shape parameter of Weibull clutter, the target fluctuating characteristics, and the parameter of the detectors are discussed in detail.2|42|3更新时间：2025-12-08
- 摘要：The Dirac-Symbol Method is reviewed briefly. In this paper, we define the dyadic Green’s functions as the generalized vector operators, the dyadic S function being the unit operator. Their Dirac-Symbol representations are then given. With the rectangular waveguide as a specific example, we may see that it is simpler to derive dyadic Green’s functions of electromagnetic field by Dirac-Symbol Method.2|40|0更新时间：2025-12-08
- 摘要：The band reflection type cavity stabilized Gunn oscillator （BRCO） coupled line length theory of the reference [1] has been modified. The optimum coupled line length of nλg/2±λg/8 so obtained is in good agreement with the experimental results. Based on this modified expression, a simplified design and test procedures have been suggested, and a high stable solid state oscillator with power stability and frequency stability of 2.55×10-3 and 5.8×10-6 respectively at 50GHz has been successfully developed.2|15|0更新时间：2025-12-08
- 摘要：A directional coupler optical modulator has been fabricated with Ti-diffused LiNbO3 waveguide for the first time in our country. Modulation experiments were made at the optical wavelength of 0.6328 μm, using modulation signals of 4 kHz, 50 kHz and 620 kHz. The modulation characteristics were: an extinction ratio of -16.4 dB, a capacitance of 3.48 pF and a 3 dB bandwidth of 1.8 GHz.2|51|1更新时间：2025-12-08
- 摘要：A method to measure the discharge current in piate-transmission-line-driven gas lasers is described, and some measurement results are given in the paper.2|17|0更新时间：2025-12-08
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