最新刊期
卷 ， 期 5 ， 1988
- 摘要：The complicated periodic bifurcations and chaotic behaviors revealed in a nonlinear electronic system. One class of periodic and dhaotic states alternating sequence and similar structures in different levels is observed experimently. A theorem on the similar structures is presented. A method to classify periodic and chaotic alternating sequences by their levels for a class of nonlinear dynamical systems is suggested. The structure regularity for each level periodic sequence and the relationships between periodic and chaotic states of diffe-rent levels are predicted.2|23|6更新时间：2025-12-08
- 摘要：In this paper, the surface field and potential distribution of a p-n junction with floating field limiting rings （FFLR） is derived by making use of cylindrical solutions of Poi-sson’s eq. and Laplace’s eq.,where the latter is used to take account of surface charge effect. The results show that positive surface charges induce increases of maxima electric field and voltage drops between the main junction and the first ring as well as between the neighbor rings. The former results by other authors are also explained by using this theory. The formulas obtained are helpful to the design of FFLR in high voltage devices.2|183|5更新时间：2025-12-08
- 摘要：An ion chromatographic method for determination of trace quantoty of anions in electronic grade water, high purity gases, e. g. N2, H2, O2, Ar and He; special gases, e. g. SiH4, PH3, CO2, HC1 and CH4; various kinds of resins, plastics, reverse osmosis membranes and ultrafiltration membranes has been proposed. The detection limit is 0.1, 0.05, 0.5. 0.5, and 0.1 ppb for F-, Cl-, NO3-, HPO42- and SO42-, respectively.In this study the anion analytical method with detection limit lower than 0.5 ppb without using concentration coloum is reported for the first time.A rapid, reliable and accurate ion chromatographic method has been established and adopted as a National arbitration method for Electronic grade water standard.2|52|1更新时间：2025-12-08
- 摘要：In this paper a theory on the non-uniformity of characteristic impedance of coaxial cables with helical corrugated inner-and outer-conductors is proposed. From a model of conductors with slowly varying quasi-circular section, by means of the domain variational ap-proach and Riccati equation, the approximate analytic expression for calculating the characteristic impedance and the voltage reflection coefficient are derived. Many problems on cable design, manufacture and connection are analysed.2|38|0更新时间：2025-12-08
- 摘要：In this paper a theoretic analysis is given, which indicates that information transmission density and transmission rate can be increased within a limited transmission frequency band by using symmetric ternary PCM technique. In addition, on the basis of applying SCMAIC, some function modules such as multiplexor, non-linear encoder and non-linear decoder, which are used in this ternary PCM system, are designed.2|20|3更新时间：2025-12-08
- 摘要：It is proved in this paper that the W-JS system is incomplete. A system named SW-JS1 without common knowledge is established with its reliability, completeness and compact theorem proved. It is explained that the puzzle of "Mr. S and Mr. P" can be formulated in this system. The relation of inference between the formal system w and the formal system SW is also described.2|13|0更新时间：2025-12-08
- 摘要：A novel finline transition structure is presented in this paper. The basic configuration takes the form of a wedge-shaped notch cut in the finline substrate along the finline longitudinal axis. The wedge-shaped notch together with the finline taper provides a impedance match between the air-filled waveguide and finline. The optimal depths of the wedge-shaped notch for different tapered transition lengths have been determined by trial and error. About a 10-dB improvement in return loss has been obtained over most of the X-band as compared with the ordinary tapered transition structure.2|42|0更新时间：2025-12-08
- 摘要：A configuration about D/A convertoor has been described by means of a unified offset-voltage at zero point electronic analog switch which is able to overcome the difficulties in manufacturing the ordinary non-offset-voltage at zero point electronic switch and other disadvantages. This paper offers a way to achieve the above-mentioned configuration by using the Multicell Type Logic （DYL） Linear AND-OR Gate and other additional devices. The electronic switch, a key device, can be easily made at low cost. Its output resistance can be offset and its working speed can be very high. The experimental results of 8-bit Linear AND -OR Gate D/A convertor show: Linear error<±1/2L. S. B., the setting time is about 5ns.The paper also analyses the output resistance of the DYL unified offsetvoltage at zero pointelectronic analog switch, the condition of making zero temperature coefficient and the work precision.2|40|9更新时间：2025-12-08
- 摘要：Based on the generalized theory of wide electron beams focusing set up by one of the authors, the present paper takes a further step to investigate the electron motion around a curved optical axis in the electrostatic and magnetic fields described by electrostatic potential and scalar or vector magnetic potential, using the contravariant and covariant forms of Newton’s equation and Lorentz force, as well as the generalized variational principle, in which the Frenet-Serret local coordinate systems both fixed and twisted along the principal trajectory are used. In this paper the different forms of equations for electron motion and electron trajectory in most general case are given.2|75|0更新时间：2025-12-08
- 摘要：The characteristics of the inclined single slot and coupled parallel two slots cut in the top wall of the symmetrical full shielded stripline are analysed by using the Fourier Transform and Galerkin’s method. The formulae of the field distribution in the slots and the secondary field distribution in the stripline are given. Under the typical conditions, the com puted results are compared with the experimental results.2|36|0更新时间：2025-12-08
- 摘要：A simple and direct method is proposed in this paper for the design of digital optical fibre transmission systems. A computer source programme has been programmed, which can aid designers to determine system parameters simply and directly based on the trade-off between technology and economy, so as to obtain a reasonable system design. Practical design examples by this programme are presented and the good agreement between the theoretical calculations and the measured results shows the method to be feasible and effective.2|53|1更新时间：2025-12-08
- 摘要：In this paper a cascade synthesis method of networks with transmission zeros in the left half of the S plane is developed and the networks are realized with one-order and two-order subnetworks. Based on these, a new method for the realization of double terminated networks is put up using no inductor.2|30|0更新时间：2025-12-08
- 摘要：The mth-order correlation-immunity on a combining function is generalized for any real-value combininng function defined in Vn （F2） in this paper. The characteristic function of a error-correcting code C is considered and it is shown that there are some relations between the minimum weight of nonzero code word and the correlation-immunity of characteristic spectrum Sfr（ω）. Finally, we obtain the result for linear codes.2|24|1更新时间：2025-12-08
- 摘要：In this paper, the advances in time-domain microwaves and it’s research area are described. Then the mathematic methods and measurement of time-domain microwaves are also discussed.2|40|9更新时间：2025-12-08
- 摘要：<正> 清华大学无线电系研制的一种适用于全固态三座标相控阵雷达的多功能全数字式可编程雷达信号处理机,于1988年6月30日通过了国家教委主持的部委级技术鉴定。该信号处理机具有以下特点: 1.功能齐全 信号处理机包含了脉冲数可变的自适应目标显示（AMTI）,数字脉冲压缩（PC）,动目标检溯器（MTD）,数字积累（DI）和恒虚警处2|15|0更新时间：2025-12-08
- 摘要：The properties of the longitudinal slot-pair on opposite wide walls of a rectangular waveguide are analysed. The general formulas used to find the solution of scattering fields are derived, and the equivalent parameters may thus be found as well. In the X-band, the resonant conductance and the resonant length of the slot-pair as a function of frequency and slot displacement from waveguide center line, together with the resonant length as a function of wall thickness are calculated.2|90|12更新时间：2025-12-08
- 摘要：Three new types of system configuration reliability model are introduced. The first type distinguishes from the series and redundant configuration. It quantitatively describes the reliability of the systems working in performance degradation. The second type is of the redundant system cocerning with memorized properties. So far as memorized properties is ignored. The third type of models is of new de-pependent configuration. Their system reliability are not only related with the number of working units but also related to their location in the system.2|90|6更新时间：2025-12-08
- 摘要：The image processing technology is used to analyse the X-ray picture and the B-ultrasonic picture of the breast tumor for extracting the features of tumor. The classification of the breast tumor is made by the method of fuzzy recognition to get correct results. It is a fast way of recognition with high rate of correct diagnosis and could eliminate doctor’s influences.2|19|1更新时间：2025-12-08
- 摘要：The unified calculation formula of sampling type phased-locked receiver precision is propo-nd by means of uГu3 transform method for LF and VLF radio navigation engineering.2|53|2更新时间：2025-12-08
- 摘要：In combination with practice, this artical summurizes a comparatively practical method to-take the hierarchical grouping and the key point of a system, gives a discussion.of difficult points for use and applicable scope.2|11|0更新时间：2025-12-08
- 摘要：This paper presents a structure of a control using an Intel-8749 monolithic microcomputer. The structure can be used in mobile centerless network composed of duplex radio equipment. Also, the design of software and hardware to hunt down a free channel and local call signal is analysed.2|14|0更新时间：2025-12-08
- 摘要：The TEM wave transmission lines with helical inner conductor and their slow wave velocity are solved by means of the equivalent transformation. Parameters of several helical transmission lines are given.2|66|0更新时间：2025-12-08
- 摘要：A design and implementation of a dynamic clutter chart （DCC） [or radar is described. The DCC mainly consists of three kind of integral and average circuits for processing radar range or azimuth and scan information. According to the type of clutter regions, the relative output is chosen from MTI, CFAR and gerneral video signal. The agreement between DCC and original video chart is encouraging.2|149|0更新时间：2025-12-08
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