最新刊期
卷 ， 期 5 ， 1984
- 摘要：Complicated two-dimensional value problems can be solved by MOM combined with conformal transformations. This approach eliminates the disadvantages and combines the advantages of MOM and conformal transformaions. The conformal transformations are used to change open structures into closed boundary problems, and to remove potential gradient singularities. The MOM with "Collin Principle" is applied to evaluate numerical upper and lower bounds for odd mode and even mode capacitance （or impedance） of two coupling trasmission lines. Some tight-coupling examples are given.2|83|3更新时间：2025-12-08
- 摘要：A modified version of the stack algorithm of sequential decoding particularly suitable for the decoding of high rate convolutional codes is presented. The modification consists in using a discarding threshold to eliminate the least likely branches for each path extension performed by the decoder. Computer simulation results with rates 2/3 and 3/4 codes over hard and soft-quantized memoryless channels, show that substantial stack memory savings and computational complexity can be achieved at hardly any cost in either error performance or computational variability, making sequential decoding a very attractive and practical alternative for the decoding of high rate codes. Furthermore, a simplified stack algoritm which exploits the periods of noiseless reception is described briefly. Finally, a new approach to the analysis of the average computational effort is presented.2|72|1更新时间：2025-12-08
- 摘要：Concerning with the design for microwave open resonators with given longitudinal distribution of RF field, the basic features of RF fields which may be realized in open resonators is discussed, the general principle for solving this problem is proposed, a simple and straightforward design scheme for the unsymmetrical triangular distribution which allows the gyrotron to achieve the optimum electronic efficiency is given. The calculation formula and plotted curves can be applied to design of high-efficience gyrotron resonators.2|65|0更新时间：2025-12-08
- 摘要：The general expression of the dyadic Green’s functions for cylindrical cavities with arbitrary cross sections is obtained by image method when the dyadic Green’s functions for the corresponding waveguides are known. As an example, the dyadic Green’s function for a rectangular cavity is analyzed, and the result is identical with that obtained by Ohm-Ray-leigh method or by the scattering superposition method.2|76|0更新时间：2025-12-08
- 摘要：The problem of vectorization of the general three-forked controlled jumps in Do loops is discussed in the light of the results of Paper CO. The derived algorithm for the vectorization has been simulatively implemented2|14|7更新时间：2025-12-08
- 摘要：Two second order recursive digital filter structures having both low coefficient sensitivity and low roundoff error are presented. The structures are derived via a two step two-pair extraction procedure, where the first step improves the coefficient sensitivity and the second step lowers the order of the digital filter transfer function. The coefficient sensitivity and roundoff error of the new structurs are analysed in detail.2|31|0更新时间：2025-12-08
- 摘要：A new type of hybrid-integrated X-band Gunn diode VCO with high tuning linearity is described, where a multi-section reactance compensation technique is used. The principle of linearizing VCO by reactance compensation is discussed. The design of the practical VCO is given.Measurement of these VCOs shows that the tuning linearity is better than 0.8% and the tuning slope ratio is less than 1.2 within 600 MHz.2|26|9更新时间：2025-12-08
- 摘要：The factors influencing the current gain hFE temperature dependence in silicon bipolar transistors is investigated. Taking into account the effect of non-ideal factor n in the medium current range a concept of the "apparent amount of bandgap narrowing" is introduced and a theoretical model of the current gain hFE temperature dependence is presented. Experimental investigation on the heavy doping effect in silicon bipolar transistor is carried out.Based on the theoretical model, a new type of the transistor with low temperature coefficient of the current gain has been manufactured successfully.2|166|7更新时间：2025-12-08
- 摘要：Proper regulation of technological parameters, Ts and r. f deposition power, can result in a mode transformation from amorphous morphology into microcrystalline or polysili-con-like structure.The crystallization of amorphous silicon film leads to a further reduction in its room-temperature resistivity by about three order of magnitude and a reduction in its activation energy of electrical conductivity. The enhancement of conducting performance is a consequence of the narrow band tail width in crystallized microcrystalline silicon.2|51|3更新时间：2025-12-08
- 摘要：An Electron Cyclotron System （ECS） is proposed as a simplified model of the equilibrium electron beam in gyrotron. By means of this model, the dispersion equation and the relationship of parameters in Gyro-TWA are obtained. Numerical analysis is carried out. It is pointed out that there exist the critical values not only for β⊥. but also for the momentum spreads. For TE01,2. TE02,2 and TE03,2, the optimum values of the ratio of the beam radius to the waveguide radius are found to be 0.75-0.80, 0.42-0.45 and 0.30 respectively.2|26|2更新时间：2025-12-08
- 摘要：<正> 1984年度的“国际微波理论与技术会议”和“微波与毫米波单片电路会议”于5月29日至6月1日在美国旧金山市同时举行。其间正值IEEE成立100周年纪念,所以盛况空前。正式与会者估计逾千人,其中有我国电子学界的代表九名。 在上述两会上交流的共有167篇论文。除35篇在两场公开讨论会（open Forum）上对口交流外,其余的均在三个并行的分组会上宣读。会议期间还举行了三场大型专题讨论会和七个即席发言的工作讨论会。此外,还分别举行了对本学科有贡献人士的发奖仪式、由200多家公司参加展出的微波工业展览会以及IEEE 100周年展览和MTT历史展览等。2|11|0更新时间：2025-12-08
- 摘要：A brief review of the past evolution in microelectronics is followed by a discussion of its current developments and future trends seen ,as characteristic of the technology. Some suggestions are then offered as to the advancement of microelectronics in China.3|125|0更新时间：2025-12-08
- 摘要：The newly emerging computer service has attracted increasingly great attention from all walks of life. And how to accelerate China’s computer industry is also a hot subject for discussion. Some views are given on the computer service as a promoter to the advancement of the computer industry.3|71|0更新时间：2025-12-08
- 摘要：The state-of-the-art of optical fiber communications abroad is summarized briefly. The achievements in developing optical fiber communications in China are emphatically described, several problems, which must be solved immediately for early practical applications of optical fiber communications in China, are also discussed.2|58|1更新时间：2025-12-08
- 摘要：Applying state-of-the-art technology to development of new business in the areas of ocean exploitation is the urgent matter for using the oceans’ resource. In all these technology major means are the underwater sound and the electronics. In this paper a brief description of the relationship between ocean exploitation and tools to operation is presented.2|162|0更新时间：2025-12-08
- 摘要：The purpose of this paper is three-fold: l)to establish relationships among error, jitter, wander, slip, delay, loss of frame alignment and total distortion, 2)to provide simple specification approaches for the above-mentioned transmission impairments in digital networks, 3) to report some data presented in CCITT Recommendations and contributions by Administrations for the study period 1981 - 1984.2|11|0更新时间：2025-12-08
- 摘要：<正> 今年7月3～8日在河北承德市召开的这届会议,有以下两个特点: 1.不举行开幕式,直接将11个专题分成30个小组在五个会场同时举行。所交流的178篇论文中的绝大部分都是作者们在自己多年实践工作的基础上写成的。无论是学位论文,或是对科研和教学、生产工作的总结,大多各有独特的见解,内容颇为丰富,在一定程度上反映了我国的当前水平和概况。会上,大家畅所欲言,能开门见山地抓住实质性问题进行深入探讨,学术气氛颇为浓厚。 2.中、青年科技工作者是本次会议的主角,49岁以下的科技工作者达220人,占总数的81％强,其中2|16|0更新时间：2025-12-08
- 摘要：The developing process and state-of-the-art of microwave semiconductor technology are described briefly.The emphasis of exploitation is introduced in terms of device and circuit functions. The paper looks into future and proposes a general guideline for the development of microwave semiconductor technology in our country.2|56|0更新时间：2025-12-08
- 摘要：Relationships between the output pulse shapes of a TEA-CO2 laser and several parameters of the laser have been observed and studied. The front edge, pulse width and time delay of the laser pulse relative to the start of laser discharge are varied obviously with γ.In order to obtain maximum energy output and maximum peak power, the laser must be operated in very different conditions.2|21|1更新时间：2025-12-08
- 摘要：If n=2m, where m is non-negative integer, then the period of the polynomial xn + x+l. Over GF（2） is equal to n2-l.2|41|0更新时间：2025-12-08
- 摘要：A practical new capacitor-5VDC 2.2F electric double layer capacitor is reported,and its structure, performance and various applications are discussed.2|76|31更新时间：2025-12-08
- 摘要：When He + Ne is used as buffer in the XeCl excimer laser, the output energy increases by 10% compared to that of the lasers with pure Ne as buffer. The output laser pulse width and the small signal gain are measured repectively. The output laser pulse broadening as the total pressure enhances is observed with He + Ne as buffer.2|17|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