最新刊期
卷 ， 期 2 ， 1982
- 摘要：A new precision method to measure microwave network parameters is reported in this paper. The reported five-port is developed and simplified from the basic concept of six-port[1,2] but with much simpler and quite defferent design considerations. The ambiguity problem in five-port reflectometer can be avoided via suitable hardware design for any posible value of reflection coefficient （passive or active load）. The design considerations, calibration and some experimental results of a simple five-port reflectometer are presented.2|19|0更新时间：2025-12-08
- 摘要：Starting from the fundamental equations of motion of relativistic electrons, we have deduced the equations of the relativistic cyclotron electrons, in the velocity-phase space under TE mode. These equations are suitable for numerical computations in the interaction space of gyrotrons with standing wave field, such as the gyromonotron and gyroklystron, etc.In the case of gyrotrons operating at TE011 mode with the fundamental cyclotron frequency at X band （10 GHz）, the electronic efficiency of 57% and the orbital efficiency of 72% are obtained, while for gyrotrons operating at the TE021 mode with the second harmonic frequency at Ka band （35 GHz）, the electronic efficiency of 26% and the orbital efficiency of 40% are obtained.Effects of longitudinal distribution functions of RF fields in the opened resonators, the maximum amplitude of RF fields, the radius of the cyclotron beam and the longitudinal magnetic field on the parameters of the gyrotrons mentioned above are discussed in the paper, and the corresponding computed results are given as well.2|33|0更新时间：2025-12-08
- 摘要：In this paper, the basic nature of AGC systems is explained and a new method is presented, which generalizes the expressions for the gain control characteristic of controlled amplifiers. Known as logarithmic sub-region linearization （LSL）, this method has many advantages over common sub-region linearization. Using the LSL method, it is demonstrated that any AGC system may be resolved into some linear systems in first order approximation. It is also demonstrated that the AGC systems with exponential gain control characteristic may strictly be transformed into a linear system by using any logarithmic amplifier. And practical AGC systems may strictly be transformed into some linear systems by using a logarithmic amplifier. Based on the above analyses, the conception on transfer function of AGC systems is presented. Thus, the questions of AGC systems are simplified. In this paper, the stability of some pulse AGC systems is also discussed. The equations for stability condition are derived, and the associated curves are given.3|162|4更新时间：2025-12-08
- 摘要：This paper gives an introduction to the design of a portable FORTRANIV compiler, it’s implementation on the computer DJS-21 and an experiment of transporting it to the computer TQ-16.2|9|1更新时间：2025-12-08
- 摘要：The timing simulation, which can describe the logical behaviors as well as the time relation between the behaviors occurring in the circuit, is an efficient approach to analyse logical circuits. There are some troubles in timing analysis by using two-valued and three-valued systems due to their own restrictions. A model on the basis of six-valued logic system for timing analysis is presented in this paper. The model and the simulation algorithm are detailed and the comparison between the six-valued model and other models in timing simulation are given. The response of the system is obtained by means of the time matched simulation algorithm. The program for six-valued timing simulation written in FORTRAN-4 which is developed as an important part in LOCAS system has been executed on PDP-11/34 computer, and the results for some sample circuits are found satisfactory.2|12|4更新时间：2025-12-08
- 摘要：In this paper, the method of computer analysis for L-waveguide H10-H20 mode transducer, is described in detail by means of combining the coupled wave theory with the finite element analysis The various parameters obtained from computer analysis show the agreement between theory and experiment in reference [1] and justify the reliability of the new analysis method.2|23|7更新时间：2025-12-08
- 摘要：By means of the reciprocity of electromagntic wave, relations between relevant pairs of coupling coefficients in a set of coupled-wave equations are derived. From these relations two forms of the coupled-wave equations most frequently appearing in the literatures are obtained. With the aid of perturbation approximation, the equivalence formula which relates coupling coefficients for ideal modes with coupling coefficients for local modes was obtained by Marcuse and Huang[1,2]. Now the formula is derived in the strict sense. Examples are given for using the formula.2|259|4更新时间：2025-12-08
- 摘要：A telephone network consisting of both △M and PCM digital coding channels and analog switching is advantageous in flexibility and economization, also it has satisfactory quality, so it is suitable for applications in industrial communication systems and other similar fields. This paper describes the concept, standard and method about such telephone network..2|19|0更新时间：2025-12-08
- 摘要："Function Words Analysis" is a method of parsing without knowing what the lexical words were. With this method, students in a short term （generally less than 3 months） English course can have more time practising with the analysis of complex sentences syntactically different from the Chinese language. Thus they can readily get the feel of English sentence construction and learn to read professional literature with the help of a dictionary.2|92|0更新时间：2025-12-08
- 摘要：This paper discusses a specific scheme for realizing the depression of clutter using DMTI in series with FFT.In order to depress the clutter, this system uses Tay-for weighting function with 30 terms. The sidelobe is decreased to -60 dB, the mainlobe widening factor is less than 1.1. The resolution of this system is 0.6 Hz for detecting misstle targets and 0.1 Hz for aeroplane targets.The designed system specifications agree well with the experimental results. This system has been used in an experimental radar system.2|28|0更新时间：2025-12-08
- 摘要：The quick graphic method for combined interference presented in this paper, not only is easy and quick for making graph, but is clear for distribution of interference. Using this general interference chart, all of combined interference can be found quickly and exactly, and the IF without interference can be selected as well.2|14|0更新时间：2025-12-08
- 摘要：A new circuit of active R filter which uses only resistors and operational amplifiers is presented. It has all advantages of such active R filter. The reactance elements in circuit have been eliminated, then it can be integrated. It is suitable for medium or low Q, even high frequency applied. It has very low sensitivities with respect to all passive and active parameters, the stability of circuit is very high.2|30|4更新时间：2025-12-08
- 摘要：This paper gives the false-alarm rate PFA for rank quantizer when input range samples are not independent[1]. But PFA is written in a multiple integral form, the multiplicity being equal to the number of samples. So it is difficult to calculate the PFA when the sample number is greater than 8. In this paper, a first-order Markov sequence of Rice model for narrow band noise is given, which we obtained from a DJS-6 computer, and MonteCarlo simulation method is used to determinate the detection performance lor rank detector in correlation Gaussian noise. So the sample number is not limited and it is possible to determine the probability of detection PD for constant target signals.2|54|1更新时间：2025-12-08
- 摘要：A solar blind photomultiplier which has a TeKCs photocathode and nine TeKCs dynodesis presented in this paper. It is of a circular cage structure, housed in a quartz envelope, with a side window. Its properties and applications are described.2|135|5更新时间：2025-12-08
- 摘要：By compensating Iransversal offset focus with axial offset focus, focal distance to correct monopulse paraboloidal reflector can be determined.Formulae derived indicate that phase distributions on apertures caused by transversal offset focus are almost in linear order, whilst those by axial offset focus are in quadratic order. Approximate expressions have been obtained by correcting linear phase distribution difference of transversal offset focus with the difference of axial offset focus, which can be used to determine antenna focal distance. Calculation results show very good agreement with experiments.2|33|2更新时间：2025-12-08
- 摘要：Several calculation methods for delayed sequences have been given by references [2-6] in which the algorithms for long sequences are usually either very tedious or complicated. In order to simplify them several new algorithms which generate delayed sequences from a central pseudorandom binary m sequence generator will be given in this paper.2|87|6更新时间：2025-12-08
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