最新刊期
卷 ， 期 2 ， 1987
- 摘要：A new kind of finit-state grammer is defined as T-degree similar derivation grammer GODT having Parameter T. The structure of this grammer GCDT not only depends on the positive sample set S+, but is also controlled by Parameter T. In the process of grammatical inference, use can be made of the information provided by the negative-sample set S- to control Parameter T for modification of the inferred grammer. So the inferred grammer GCDT meets the following requirement:This learning method gives a satisfactory solution to the problem which so far has not been solved in the extent of finite-state grammer. The problem is that the inferred grammer cannot be modified by means of the negative-sample information.2|52|1更新时间：2025-12-08
- 摘要：A solution is obtained for the problem of the diffraction and scattering of the lateral wave propagating over a forested flat-curved-flat terrain by the mode matching procedure. If the radius of the curved terrain is much less than that of the earth, it can be viewed as a combination of a flat-curved-flat terrain. And then a computation of the attenuation factor of the lateral wave propagating over a forested flat-curved-flat terrain can be carried out by the computer program of the Airy integral.2|33|0更新时间：2025-12-08
- 摘要：An accurate formula for the characteristic impedance and other parameters of the "split" coaxial line with a confocally elliptial cross-section are obtained by conformal transformation, and some different cases are analyzed.2|62|11更新时间：2025-12-08
- 摘要：Echo cancellation in two-wire full-duplex data transmission is usually performed with data-driven transversal filters. In this paper, a new scheme for a microprocessor-based digital adaptive echo canceler is propsed. Since the estimated echo signals are directly derived from the binary data code, the amount of manipulation is reduced by a factor of 3 - 5 compared with conventional manipulation. A theoretical analysis of adaptation convergence, and computational complexity is given, and the convergence characteristic of MTEC is verified by the computer simulations.2|13|0更新时间：2025-12-08
- 摘要：<正> 由中国电子学会电波传播学会主办的全国电波传播学术年会于1986年10月20日至26日在西安临潼召开。来自全国29个单位的130名代表出席了会议。 会议期间宣读论文140余篇。分四个专业组进行讨论。论文的内容非常广泛,有理论分析,也有实验资料总结。在电离层传播方面,距离近两万公里的南极“长城站”与北京的短波通信讯道分析特别引人注目。对流层传播中的宽频带传输问题,是近年来受到人们关注的2|9|0更新时间：2025-12-08
- 摘要：The heterojunction barrier controlled ballistic electron transistor-a novel three terminal semiconductor device which could be operated competently at millimeter wavelength frequency is proposed. The stracture of this device is similar with the hot-electron transistor and it’s performance will combine merits of a normal MESFET and a bipolar transistor. The high-freguency performance expected will be one decade better than a MESFET.2|17|0更新时间：2025-12-08
- 摘要：Two nonlinear macromodels of operational amplifiers which are suitable for analysing the time-domain and frequency-domain are prsesented repectively. The linear and nonlinear responses of OAs under the drive of different signal levels are considered. The nonlinear saturated current curve of the input stage and the analytical expressions are obtained. In the slew rate analogy the innate physical property is discussed. The simulation results are quite consistent with the experiments.2|64|4更新时间：2025-12-08
- 摘要：本文给出了一种具有一定精度又可节省机时的计算方法,用它分析计算了毫米波平衡混频器非线性结电容的作用。得到了在应用上很有意义的结果。2|19|0更新时间：2025-12-08
- 摘要：A conclusion has been derived for three-wave frequency mixing. It is confirmed that in most cases it is the total photondensity rather than their ratio that has a stronger influence on mixing output. The experimental result is consistent with the theoretical calculation curve.2|34|0更新时间：2025-12-08
- 摘要：This paper presents the concept of the Indefinite Scattering Matrix（ISM） of a n-port network. Two types of ISM, the node-based and the loopbased, and their relationship are discussed. Its properties under both real and complex normalizations are investigated, leadingto a new sub-set of matrix--the Equi-cofactor-sum Matrix. Some applications of the theorempresented are illustrated with examples.2|30|5更新时间：2025-12-08
- 摘要：Three active RC second-order bandpass filters with active compensation are introduced. A general formula for analysing the shift in dominant poles is also presented. A simple approach based on an analysis of the location of second-order parasitic poles is used to suppress the self-sustained high frequency oscillations usually found in these circuits. The experimental results agree basically with the theoretical analysis.2|310|0更新时间：2025-12-08
- 摘要：The design formulae （in close form） for large side-aperture waveguide couplers are derived by means of the field matching method and the relevant design charts for a variety of parameters are also given in virtue of computer. The present formulae are verified through the experiment data obtained from the published papers, as well as the available de vices. Finally, the result obtained is compared with H. in detail.2|20|0更新时间：2025-12-08
- 摘要：<正> 中国电子学会电子材料学会和半导体与集成技术学会于1986年12月13日～18日在福建省泉州市召开了“第四届全国化合物半导体和微波光电器件学术年会。来自全国46个单位,160名代表出席了会议 年会期间宣读论文101篇,大会报告7篇论文,按材料工艺、材料特性、微波器件和光电器件四个专业组进行交流。2|7|0更新时间：2025-12-08
- 摘要：The band-limited function extrapolation can be considered as an approximation problem in operator space, and the Papoulis-Gerchberg method correspones to the case of approximation using Taylor series. A new iterative extrapolation algorithm, based on Lanczos-r approximation, is proposed. Theoretical and numerical analysis show that the new method has a much faster convergence rate than the Papoulis-Gerchberg method.2|63|1更新时间：2025-12-08
- 摘要：This paper discusses the design method of E/D NMOS high stability voltage reference. Based on R. A. Blauschild’s theory, some new results and formulas are obtained, and a new NMOS voltage reference with temperature coefficient trimmable-on-chip is achieved.The circuit design is simulated with SPICE-Ⅱ, and the experiment of the test chip shows a satisfactory result.2|85|2更新时间：2025-12-08
- 摘要：Sampling Conversiom theorem are expounded. The loop’s impulse transfer function is derived from an eguivalent linear phase model for Sampled Conveter Phase-Locked Loop （SCPLL） by means of the z-transform and Sampled Phaselock principle. The loop stability, phase noise characteristic and some other performances are analyzed. The new results for the maximun stable loop gain, the mean-sguare error of the phase jitter from IF for the SCPLL and the transient response are provided, and the results are useffull for design of SCPLL.2|80|0更新时间：2025-12-08
- 摘要：<正> 军用指挥、控制、通信和情报系统(简称C3I系统,工作于严酷的对抗环境中。讨论这类系统面临的对抗环境以及如何使它在对抗环境中发挥正常功能,是关系系统正确设计和适当评价的一个重要问题。 一、对抗环境及防御措施 摧毁及抗毁:摧毁、指敌方用炮击或轰炸等物理手段毁坏设备。主要抗鼓手段有:机动,包括机载、车载机动或进入地下掩体中工作;系统结构设计适当（功能分散、分布式或其它网络结构）;系统设备选型2|14|0更新时间：2025-12-08
- 摘要：The phase shift or amplitude difference between any two channels in micro-wave main system feeds or monitor system feeds can be accurately measured by the method described here. The accuracy of phase shift measurement is about 1°. This method can also distinguish the phase shift of microwave main system feeds from the monitor system feeds, and can be used to adjust microwave systems, thus make its usage of most value in appling and repairing.2|31|9更新时间：2025-12-08
- 摘要：Stealth air-vehicles and anti-radar missiles （ARM） have become serious growing threats to military radars, which therefore must extend radar’s capability to cover anti-stealth and anti-ARM. As a background to look into the new area of radar ECCM a concise discrip-tion of aircraft’s stealth techniques and the state of arts of ARM are given. A series of effective and realizable techniques or measures for radar’s anti-stealth and counteracting ARM are mentioned in detail. Many of them are similar to each other and also to anti-electronic jamming.2|192|29更新时间：2025-12-08
- 摘要：The application of hydrogenated amorphous silicon （a-Si: H） passivation film to the power transistors is reported in this paper. Experimental results show that the passivation film has contributions tolhe improvement of the electrical properties and to the prevention of the p-n junction contamination, hence to the improvement of the reliability and stability of devices. The passivation mechanism is also discussed.2|30|1更新时间：2025-12-08
- 摘要：Systematic studies on physical properties of a-GaAs films prepared by PECTD （Plasma Enhanced Chemical Transport Deposition） method are carried out. In the room temperature the undoped a-GaAs films appear as N-type, and its electron drift mobility is 10-210-3cm2/V. s. It is found that an excess of Ga element and the existance of C1 atoms in the a-Ga As films will change its physical properties. Theoretical models are suggested to explain the above phenomena.2|37|0更新时间：2025-12-08
- 摘要：In oxide atmosphere, the surface conductivity of ZnO film is sensitive to the partial pressure of reducing gas. With this property, ZnO film can be used as gas sensors, but it can be used with practical sensitivity and response speed only when it is under higher temperatures because of the absorbing properties of the film surface.2|67|0更新时间：2025-12-08
- 摘要：Another way for expressing the kirchhoff’s law in a mutual-inductance network is given. An incidence matrix, independent circuit matrix and complex impedance matrix containing mutual inductance are derived. For every lumped element a expression of the complex impedance with unified integral form and a capacitance formula in integral form are also given.2|70|18更新时间：2025-12-08
- 摘要：A new scheme for adaptive DPCM picture coding is proposed by modifying the scheme previously reported in [1], using the criterion of minimum entropy value of prediction errors. Calculations of the entropy and RME values with four test pictures （sampling frequency 10 MHz）show that, the scheme has good performances, while its algorithm is relatively simple.2|60|4更新时间：2025-12-08
- 摘要：This paper discusses the generation of the symbolic sensitivity functions of networks by using the k-trees topological method. The method involves only some k-trees. There already exist good algorithims and programs for deriving the k-trees, so the method is easy to realize by using a computer. Another result is presented a topological formula for any 2-order algebraic cofactor in passive network node admittance matrixes.2|11|0更新时间：2025-12-08
- 摘要：An algorithm for the generation of all the essential complementary partitions （ECP） of a .given partition is described, and the transformation of a given partition into "natural arranged partition* proposed in this paper makes the algorithm simplified, thus reducing the amount of calculation, which is of great significance in the actual application of the algorithm.2|8|0更新时间：2025-12-08
- 摘要：A design of electromagnet biased by RCo5 magnets in series is offered. It is "suitable for C,X and K band YIG tuned devices. Its volume is only 140 cm3, weight 0.5 Kg. The field strength in 2 mm gap is over 6.5 KOe. Design formulae are given and simplified for quick design. It is pointed that the leakage permeance of various magnetomotive forcos in series circuit is different from each other.2|46|1更新时间：2025-12-08
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