最新刊期
卷 ， 期 1 ， 1987
- 摘要：A general method is presented for generating the directed k-tree polynomial of the directed graph associated to an active electrical network by means of its multi-level vertex tearing and its corresponding directed k-hypertree polynomial. Using it the scale of electrical networks which can be topologically analysed by a computer will be increased, and the result expressions are terse. Furthermore, for the special case k=l, e = 2, the recursive formulas are presented for generating the directed hypertree polynomials of a hypergraph having two hyperedges. Using it the directed tree polynomial of a directed graph G can be found conveniently and efficiently. Its expansion gives all directed trees of the graph G.0|40|11更新时间：2025-12-08
- 摘要：<正> 把门类众多的电子产品,最优化地组成一个能够承担和完成某种信息的获取、汇总、传输、存储、交换和利用,并能对抗诸种干扰的实用工程系统,是我国现代化经济建设、国防建设所面临的重要任务。电子信息产业及其从业人员将是其中的主力。 这类工程不仅涉及多种资源的开发,和要靠信息论、控制论、运筹学、系统科学、思维科学和计算机科学的支持,而且要求一切与此有关的部门的密切配合。为了促进这一在纵向上和横向上高度综合的新兴学科的发展,并发挥有关科技工作者和经济工作者横向联系的优势,中国电子学会近年来一直在酝酿和组建能适应这一要求的学术团体。0|6|0更新时间：2025-12-08
- 摘要：The effective constitutive parameters of forests at high frequency range is analyzed. It is found that because of the occurence of resonance at high frequency range in tree trunks, magnetic energy can be stored and the effective permeability of the tree trunks needs not be determined conventionally to be unity. For vertically polarized waves, the effective permeability is found to be not significantly different from unity. For horizontally polarized waves, however, both the real and imaginary parts of the magnetic susceptibility, in a typical example, is about 10-4 and the imaginary part of electric susceptibility is about 10-3 and the real part of that is about 0.05.0|36|2更新时间：2025-12-08
- 摘要：An experiment on cross-polarization, fading and space diversity was conducted at 7.6 GHz over 29.07km path and the radiosonde was made in the mid-path. The experimental results show that the multipath fading and depolarization are serious in the central plains of China, the effect of depolarization on system performance is much more important than fading of signal level for double polarization frequency reuse communication system, the deep fading and depolurization in clear-air are caused by multipath due to atmospheric layer without the surface reflection, the high correlation and linear relaton with slope not to equal to-1 exist between the cross-polar discrimination XPD and Co-polar attenuation CPA, a significant improvement for deterioration of XPD and CPA can be obtained by space diversity .The experimental results agree well with the theoretical calculations on probability distribution of XPD and CPA.0|70|1更新时间：2025-12-08
- 摘要：A re-recognition algorithm is developed for vectorization of loops with logical IF statements and block IF statements. Many of fairly general and complicated loops are successfully decided to be vectorizable, and they will reach their separate vectorized object program segments, if this algorithm coordinates with the re-writing technique.0|21|4更新时间：2025-12-08
- 摘要：After analysing user requirement, system working conditions and the practical life of coding schemes, this paper discusses how to select, improve, develope and standardize the Chinese coding schemes, describes some methods and gives a practical example.0|51|4更新时间：2025-12-08
- 摘要：<正> 中国电子学会信息论专业学会于1986年11月19—22日在广东省电子学会成立三十周年之际,在华南工学院召开了“信息论新方向讨论会”。 这次会议的特点是方向新、内容新、学术味浓。51名代表中有教授、副教授30人,博士、硕士研究生11人。会上宣读的论文,既有国外信息论发展的最新动态,也有国内研究的最新0|41|0更新时间：2025-12-08
- 摘要：InGaAs Hall devices were firstly produced by planar technology. In the case of same carrier concentration, the sensitivity of InGaAs has increased by fifty percent as compared with GaAs Hall devices. Because InGaAs has a sufficiently high carrier mobility, it has small temperature dependence of its characteristics at a wide temperature range between -50 and 200℃, although it has a narrower bandgap. It has lower contact potential barrier. Magnetic flux densities of InGaAs Hall device were determined up to 80 kG at 4.2 K.0|17|0更新时间：2025-12-08
- 摘要：The dispersion characteristic of the ring-plane slow-wave circuit for mm wave TWT is worked out by the variational method. The establishment of the variational equation and its solution are discussed. The numerical calculation is performed on the computer. Theoretical values obtained show good agreement with the experimental results of our cold measurements. This theoretical method can be used for the analysis and design of the ring-plane circuit.0|17|2更新时间：2025-12-08
- 摘要：The problems of using packaged diodes with large junction area for milimeter wave integrated mixers are discussed. A cavity stabilized integrated Gunn oscillator is given and analyzed. A high performance 8mm wave integrated front-end has been developed with minimum double side band noise figure of 3.6 dB, frequency temperature coefficient of 3×10-6 /℃, spectra line width of 500 Hz and very high shock-resistivity. Such unit has been produced by small amounts and working well in many systems.0|30|3更新时间：2025-12-08
- 摘要：A partitioned method of optimizing extraction of MOS3 model parameters for small size MOSFET in program SPICE-ⅡG is discussed. The oaper includes: input date to be measured, partitioning methodology, and optimizing method of model parameters. The method is very simple and its convergence is better. The differences between measurement and calculation are less than 16%.0|37|0更新时间：2025-12-08
- 摘要：The error-rate performance of the high-speed QPSK digital satellite communication system with cochannel large capacity FDM-PM signal interference is studied by means of computer simulation. On the basis of the satellite signal’s narrowband transmission characters, base-band equivalent models of the satellite high-speed QPSK modem system, TWT no-nlinearity, large capacity FDM-FM interfering signal and noise are derived and realized in the computer. A computer simulation system is constructed, which is suitable for studying the error-rate performance of the high-speed QPSK digital satellite communication system under interference and noise. Using this equivalent system, the transmission error-rates of the high- speed QPSK satellite signal are simulated under varying signal-to-interference ratios and varying signal-to-noise ratios, the error-rate performance curves with up-link and down-link large-capacity FDM-FM signal interference are obtained, and the simulasion results are discussed.0|27|0更新时间：2025-12-08
- 摘要：The three-dimensional numerical analysis of the combination multipole field-rotationally symmetric field systems is discussed. Some practical methods are presented. A computer program used to analyse the combination systems has been developed. Some novel features of multipole lens are shown through several examples, in which unsymmetric voltages are applied to the lens. The elementary properties of the system combining a multipole len with a round len are studied.0|26|0更新时间：2025-12-08
- 摘要：The paper-discusses the method and laboratory models for the accurate measurement of the group delay distortion in the telephone network, microwave network and trunk network for data transmission. Loop measurements are discussed. A program-controlled approach using microprocessors is presented, and laboratory models are described and evaluated. The use of a microprocessor results in a low-cost, yet accurate and reliable group delay meter.0|19|1更新时间：2025-12-08
- 摘要：The theory of error correction in scattering parameter measurement is discussed and a further improvement is suggested. The corresponding calibration techniques and ma-thematic models are given. Using μC onto NA accomplishes the error correction and the analysis shows good agreement with the practical results.0|38|2更新时间：2025-12-08
- 摘要：The approach to obtain a variety information of the radio anechoic chamber is presented. On the basis of geometric optics, the representation of fields in radio chamber in the three dimensional case is derived, from which the reflectivity and cross polarization coefficient concerning with both the transmitter and receiver antenna patterns can be obtained. In addition, according to the region of the transmitting and receiving points, the position of the reflected zone on each of the six walls is sought out. Consequently the arrangement of the absorbers on each wall can be selected and arranged to be more reasonable and economical. The numerical and graphical results are given.0|156|6更新时间：2025-12-08
- 摘要：<正> 中国电子学会通信学会和中国通信学会光通信专业委员会联合举办的全国第三届光纤通信学术会议,于1976年11月11日～14日在桂林电子部第34研究所召开。 这次会议收到论文500多篇,经审定收入论文集的有251篇。会议分基础理论、数字光纤传输、模拟光纤通信系统及网络、半导体激光器及探测器、无源器件、传感及测量、光纤光缆、测量和应用七个组进行学术报告和讨论。0|7|0更新时间：2025-12-08
- 摘要：The frequency stability is studied by using the stochastic signal processing theory and a new variance definition in the time domain, the Generilized Allan Variance σp2,q（T） is given. It is proved that the variances including the Allan Variance and the Modified Allan Variance are all the special cases of σp2,q（T）. For the power law spectral noises, the signal processing models for calculating σp2,q（T） from Sy（f） and its calculation formulas are obtained, the conversion formulas between σ32,2 （T） and Sy（f） are derives, the calculation formulas of the other variances in the time domain from σ32,2（T） are given and the conversion between Sy（f） and σp2,q（T） can be made easily, the formulas of σ32,2（T） by computer simulation are verified.0|186|10更新时间：2025-12-08
- 摘要：The properties of land clutter and target echo for ground combat surveillance radar are presented. The mathematical model for the clutter power spectrum and relationships between the spectrum cut-off frequency and windspeed are obtained. The experimental results show that the slowly moving ground targets signal embedded in strong clutter may be detected by long time integrating processing in terms of making the plus electrical level from the Doppler signals and minus ones from the countpart. The theoretical analysis is also made for the amplitude statistical property of the CW radar echo fluctuation.0|95|7更新时间：2025-12-08
- 摘要：<正> [本刊记者报道]1986年11月4—7日,中国电子学会在南京主持召开了首届中国国际雷达会议。围绕着使雷达更有本领和更为聪明这一主题而展开的这一会议,共交流了140余篇论文,达到了预期的效果。这是一次成功的会议。主要表现在:使与会人氏了解到我国在雷达工程建设上已取得长足的进展,在新技术开发和理论探索上已跟上不断前进的国际步伐;使我国专家充实了对现有差距的认识,加深了对当前发展趋势的理解;增进了中外学者的学术友谊。0|16|0更新时间：2025-12-08
- 摘要：An overview of the development and the state-of-the-art of packet-switched voice communication is described. Many important technical problems in this area are also discussed. The necessity for China to do research on this field is presented.1|21|9更新时间：2025-12-08
- 摘要：A new principle of flow sensors is introduced. When a fluid is passing ever a heated chip, the change of the power dissipation required to keep the chip temperature constant can be used as a measurement of the flow rate. Based on this new principle, an integreted flow sensor has been made by CMOS technology. It has simple structure, small size （1×1.9mm）, high sensitivity（80mV output at flow rate of 50 cm/s with chip temperature 55℃ and fluid temperature 30℃）.0|33|22更新时间：2025-12-08
- 摘要：A novel method for characterizing the surface resistance of two conducting plates shorted at both ends of a dielectric resonator is given in this paper. It utilizes only one dielectric resonator that can resonate with both TE012 and TE021 mode at same frequency. The theoretical relations and experimental results are also given.The described method has been proved to be convenient, relatively accurate, and of practical usefulness.0|19|0更新时间：2025-12-08
- 摘要：The oxidation resistance and the secondary electron emission characteristics of copper grid in front of the target of a T. V. Camera have been improved by Cr+ implantation. Compared to copper grids evaporated with carbon, ion implantation is a prospective method for improving these characteristics.0|55|0更新时间：2025-12-08
- 摘要：The root locus of control theory is applied to the networks synthesis. A criterion theorem of R-type function is presented, and a new method is given for designing RC two-port networks connected the arbitrary RL loads at the output terminal. The realization problem of the transfer function is thus solved, with the poles on any arbitrary positions on the left half of S face, and the number of elements used for the realization network is reduced.0|20|2更新时间：2025-12-08
- 摘要：The field effect of GD-a-Six C1-x:H films under illumination and photoconduction as we ll as the S-W effect are studied using the MOSFET structure. The measurement results show that the density of states due to illumination is about 1017/cm2·eV.0|14|0更新时间：2025-12-08
- 摘要：A picture in picture colour television system in accordance with the TV standard of China and with improved quality is put forward. The filtering, storage, sampling and quantization schemes of the subpicture signal are discussed, the methods of composite filtering, time division shared ADC, sampling correction and reading out correction, etc. are proposed. The test results show that the basic consideration of the system is correct, the designs of main circuits are feasible, the system functions are realizable.0|4|1更新时间：2025-12-08
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