最新刊期
卷 ， 期 8 ， 1994
- 摘要：The store technique of persistent object providies programmers with the manipulation capacity of RAM and disks on the level of high Languages.The study of the store technique of persistent object is substantiated in the practice of persistent object-oriented programming languages （POOPL） , object-oriented databases （OODB） and object management systems （OMS） . This paper deals with the basic concepts and requirements concerning the store of persistent object ,formulating POOPL ,OODB and OMS. In addition,the paper discusses briefly the prototype design of distributed object store as well as the design of JB2 OMS.关键词：object-oriented;Persistence;Object management system;Object-oriented database.2|164|47更新时间：2025-12-08
- 摘要：关于矩形波导中电并矢格林函数的讨论逯贵祯，司重生（北京广播学院２９信箱）目前，在电磁场理论的研究中，有许多文章讨论并矢格林函数。对并矢格林函数进行研究有着理论与实践上两方面的意义。从理论上讲，要解决矢量函数在源区的奇异性问题。从实践上讲，大量的数值计...2|112|0更新时间：2025-12-08
- 摘要：Recursion is one of the most important basic principles in computer science[1].But it has become a natural enemy of parallel processing since the parallel system was born. Based on cutting with real changing order points[2,3] ,cutting with equal length and refined cutting[3] ,the paper introduces the concepts of function weight and segment cutting ,simulates the relationship between whole course tracing[4] and segment tracing[5] and derives the result that cutting a shorter segment will reveal the law of whole course, so as to destroy recursion limits thoroughly and display the maxium benefits of parallel processing by means of multi-processors or vector processors.关键词：Parallel processing;Circuit recursion;Linear weight function;Static destination;Segment cutting2|24|0更新时间：2025-12-08
- 摘要：This paper presents a learning problem from positive examples based on multiple valued minimization paradigm.A new heuristic algorithm for the problem is given.Compared with the existing learning methods from examples,the proposed algorithm is based on deductive reasoning. Furthermore,the algorithm is simple,fast and easy to implement. The comparison of the proposed algorithm with the inductive learning system AQ15 and the Boolean function minimization system SWT is carried out by two illustrations: the knowledge acquisition for the automatic weiding technology design and the Boolean function minimization.关键词：learning from examples;Knowledge acquisition;Multiple valued minimization2|88|3更新时间：2025-12-08
- 摘要：In this paper we briefly review some terminology,concept and structure of the expert system based on neural networks for ICCAT and discuss its applications.This opens the door to a number of application of the ICCAT test technique based on neural network theory.关键词：neural networks;ICCAT;expert system2|68|7更新时间：2025-12-08
- 摘要：The silicon bipolar transistors with hFE≈300 at 77K and hFE=21.7 at 10K (this value is better than that reported in reference[7]have been designed and fabricated. The IC, IB-VBE characteristics at 77K and hFE-1/T characteristics of the devices have been measured and an explorative explanation on them has been given by a new idea.关键词：Low temperature transistors;Silicon bipolar transistors2|31|1更新时间：2025-12-08
- 摘要：A new silicon unitized micro-acceleration sensor is presented in this paper. Both analysis and experiment show that it has many advantages over the conventional structure,such as good temperature characteristics,simple process technique,high yield and so on. The structure is most suitable for manufacturing resonant sensors.关键词：Silicon micromechanic structure;Acceleration;sensor2|94|0更新时间：2025-12-08
- 摘要：In this paper both bolometric and optically induced nonequilibrium mechanisms for the superconducting photodetector are theoretically analysed. Formulae of responsibility for the device have been shown. Characteristics of photodetectors based on the granular and epitaxial films are measured ,and the experimental results have been compared with the proposed theoretical model. High Tc superconducting YBa2Cu3O7-δ film photodetectors with good performances are developed.关键词：Yba2Cu3O7-δ film;Photodetection;Infrared device2|58|0更新时间：2025-12-08
- 摘要：A nonlinear circuit model based on the small signal equivalent circuit of semiconductor laser is presented in this paper. This model enables the modulation response and nonlinear distortion of LD and other relevant circuit to be analyzed in a unified manner using any general circuit analytical software. The second harmonic and third order intermodulation distortion of a single mode LD are predicted by hsing the established model. The results are in good agreement with published theoretical and experimental data.关键词：Semiconductor laser diode;Small-signal circuit model;Nonlinear circit model2|86|1更新时间：2025-12-08
- 摘要：加密电路ＨＵ－００１研制万积庆，周志仁，陈迪平，曾云（湖南大学物理系，长沙４１００１２）计算机系统的安全保密是计算机数据处理时在硬件和软件方面采取的保密措施实施安全保密的目的是保护软件版权不受侵犯，目前常采用固化软件，而ＲＯＭ是软件载体，近年磁卡的伪...2|31|2更新时间：2025-12-08
- 摘要：A common method is proposed to analyze synchronized system with N oscillators mutually injection-locked. Both the perfect equivalent nonlinear model and state equations of the system are obtained. The CAA and CAD of these kinds of systems are made practical when the parameters of the physical oscillators and combining networks are put into computation.关键词：Mutual injection-locking;nonlinear network;Power combining system;Synchronized oscillation2|63|0更新时间：2025-12-08
- 摘要：The capacitance between gate and source of a-Si TFT consists of not only parasitic capacitance Cgspdue to overlaps between gate and source electrodes ,but also intrinsic capacitance Cgsi between the channel at the source sied and gate electrode. The formula for Cgsi is derived from gradual channel approximate model. The revised formula for level shift voltage △Vp at pixel electrode may explain some experimental data satisfactorily,which can not be done by traditional formula for △Vp, so the ambiguous view on △Vp mechanism is clarified.关键词：Pixel voltage;Level shift;Intrinsic capacitance2|94|3更新时间：2025-12-08
- 摘要：Recent researches on hypergraph theory with application are surveyed. Furthermore,some new concepts and methods of hypergraph are given. Four topics on hypergraph theory with application are discussed.Finally ,some open questions are presented.关键词：Hypernetwork;hypergraph;matroid4|2265|72更新时间：2025-12-08
- 摘要：In this paper,a kind of laser-controlled semiconductor-loaded E-plane waveguide switch has been presented. The on/off ratios and insertion losses are given under laser illumination.The on/off ratio reaches 38. 5dB,the front fringe time of the switch is about 0.05ms,and the insertion loss is only 0. 16 dB at frequency 37.1GHz. One simple method to analyze its behaviors, which is in good agreement with the experimental results,has been introduced. It shows that such switch can be applied in high power millimeter-wave system.关键词：Laser control;Waveguide-loaded switch;Lossy disc2|28|0更新时间：2025-12-08
- 摘要：NiOx thin films were prepared using dc magnetron reactive sputtering in the various pressures of oxygen. They were subsequently hydrated to obtain NiOxHy by treatment in the aqueous KOH. Electrochemical characterization of NiOxHy thin films were measured,and spectral normal transmittance and near normal reflectance for bleached state and coloured state of NiOxHy thin films were measured in 0.35〈λ〈2.5μm wavelength range. Sputtering oxygen pressure dependence of average luminous transmittance ,reflectance and absorptance on the bleached and coloured state was derived. The absorption coefficients for near optimum sample vs wavelength and electrochromatic mechanism were discussed.关键词：Magnetron reactive sputtering;Electrochromatic;absorption coefficient2|68|3更新时间：2025-12-08
- 摘要：An integrated circuit of a receiver-stimulator has been designed for a multiple-channel electronic cochlea using a combination of full-custom and semi-custom design strategies,The IC mainly contains a data receiver,a decoding circuit ,a control signal generator,a supply voltage monitor,an error detector,a programmable current source and an output switching network. It has two stimulation modes ,256 levels of output current and 22 outputs for electrodes. All of the analog and digital circuits have been fabricated using a standard 3-μm CMOS P-well process technology. The chip area is 12. 5mm2.关键词：Hearing prosthesis;Hearing-aids;Electrical stimulation2|80|4更新时间：2025-12-08
- 摘要：In this paper,a new proceeding method which takes all element of canonical piecewise-linear resistive nitwork as source elements is presented.A set of complete equations of modified nodal analysis for canonical piecewise-linear dynamic network and associative algorithm are given. This algorithm can calculate general canonical piecewise-linear dynamic networks. A claculative example is also discussed in detali.关键词：Modified nodal method;Canonical piecewise lineral dynamic network2|44|2更新时间：2025-12-08
- 摘要：The graph analysis method for topological equivalence of interconnection networks,and the concept of logical name matrice for describing logical name structure are proposed. Potical experimental results of crossover networks are reported. Potential applications of optical crossover networks in the fields of ultra-computer systems and telecommunication switching systems are explained.关键词：Interconnection network;Optical interconnect;Photonic switching;Parallel computer architecture2|44|3更新时间：2025-12-08
- 摘要：The diode and embedding impedances for different parameters are calculated and analyzed and a matching guidline is provided. The 3mm mixers operated overall wave band have been desinged. The minimum noise temprerature of the mixer TM（DSB）=150K is obtained at 80～15GHz.关键词：Millimeter mixer;diode chip;Embedding network;wide bend matching;Noise temperature2|129|4更新时间：2025-12-08
- 摘要：A ten-valued circuit of decimal arithmetical unit using DYL devices is presented. The DYL device is a kind of linear element,able to work at any voltage between 0-3 volts with high resolution to signals.This gives a good ground for the realization of the ten-valued logic circuits,with high information density. By designing the circuit, a method called"data assigning and selective output"（DASO） is adopted. All possible values of the output are assigned to the circuit,and proper output is selected out according to the input signals. The method of DASO is of general significance to the design of multiple-valued circuits.关键词：multiple-valued logic;Continuous logic;Arithmetical unit.2|58|0更新时间：2025-12-08
- 摘要：The concept of scale-limited feedforward networks is put forward in the paper. On the basis of understanding the major function of the networks,an exploration is made into the mechanism of the least squares approximation that the network carries out on a given discrete point set.关键词：Theory of artificial neural network;Multilayer feedforward network;Back-propagation network2|35|0更新时间：2025-12-08
- 摘要：This paper first suggested a method,which has used the kinetic theory of chemical reation for investigation of semiconductor statistics （distributions） then,a several channels ,in which oxygen negative ion O2￣-,O￣- can be produced on the surface of gas sensing materials are analysed by the same method,and the formula of the concentrationratio [O2￣-]/[O￣-] decreases with the temperature increases and estimating of ionsorbed madelung potential ,a conclusion is made ,which it is impossible for ion O￣- to be produced on the surface of the perfect ionic crystals. Furthermore ,the channel which possiblly produces O￣- on the surface is described.关键词：Oxide semiconductor;Surface;Adsorption;Reaction;Kinetics.2|71|15更新时间：2025-12-08
- 摘要：On the basis of a priori reference and existance of tolerance,problems of diagnosis are clearly distinguished as three different classes.It is revealed that fault cones are objective reality and thereby features of these classes are developed.关键词：fault diagnosis;model;Fault Cone;manifold2|34|5更新时间：2025-12-08
- 摘要：用改进型电流传输器实现的新型理想浮地电感器梁荣新（广东石油化工高等专科学校，茂名５２５０００）ＴｈｅＮｏｖｅｌＩｄｅａｌＦｌｏａｔｉｎｇＩｎｄｕｃｔｏｒＲｅａｌｉｚｅｄｂｙＵｓｉｎｇＭｏｄｉｆｉｅｄＣｕｒｒｅｎｔＣｏｎｖｅｙｏｒｓ￥／／电流传输器是一...2|57|6更新时间：2025-12-08
- 摘要：八毫米自由空间波功率合成器葛俊祥（北京航空航天大学电子工程系，北京１０００８３）自１９８８年和１９９０年Ｋ．ｃｈａｎｇ和Ｔ．ｉｔｏｈ等人分别在基波、谐波提出自由空间波功率合成方法以来，这项功率合成方法在国外微波界受到高度重视，并相继提出许多新的合成方...2|151|0更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0