超导技术在通信网络中的应用

改善通信网络能力,提高通话质量、增加通话容量、扩大基站覆盖范围、增强抗干扰能力,已成为移动通信、军事通信和卫星通信系统的关键,超导技术可以有效解决这个问题。对超导技术进行了理论分析,对比了采用超导滤波系统与传统系统性能的优劣,阐述了超导滤波器对通信系统发展的影响。     

超导磁储能及其应用（下）

超导磁储能系统（SMES）是超导电力技术的一个重要组成部分,SMES不仅可用于调节电力系统的峰谷,而且可用于降低甚至消除电网的低频功率振荡从而改善电网的电压和频率特性,同时还可用于无功功率和功率因数的调节以改善电力系统的稳定性,预期在UPS储能电源系统中发挥作用。文中介绍了超导电性、SMES的七作原理和特点、应用（重点介绍SMES-UPS）和发展前景。     

超导／半导体兼容技术

本文首先阐述了超导 /半导体兼容技术的应用领域 ,然后给出了超导 /半导体兼容器件、电路、系统的基本构成及优点 ,最后介绍了超导技术的研究热点。     

超导磁储能及其应用（上）

超导磁储能系统（SMES）是超导电力技术的一个重要组成部分,SMES不仅可用于调节电力系统的峰谷,而且可用于降低甚至消除电网的低频功率振荡从而改善电网的电压和频率特性,同时还可用于无功功率和功率因数的调节以改善电力系统的稳定性,预期在UPS储能电源系统中发挥作用。文中介绍了超导电性,SMES的工作原理和特点、就用（重点介绍SMES-UPS）和发展前景。     

超导陶瓷及其制法

本文从三个阶段叙述超导陶瓷的发展过程。自1987年以来发现的高温超导材料,及超导陶瓷的制法。为研究超导材料工作者提供技术参考信息。     

我国超导电子学进展

本文着重介绍我国超导电子学在几个重要领域里的发展现状,并对超导电子器件的制备、基础理论研究以及应用中的相关技术扼要地作了介绍。以向对我国超导电子应用技术感兴趣的人们提供参考。     

超导RSFQ RS触发器基本原理与时域仿真

在超导计算机体系研究中，超导RSFQ逻辑单元设计与仿真是其中重要的环节，但理论分析得到的结果往往不能直观地展现电路的工作过程。超导RSFQRS触发器是构成超导计算机体系的重要逻辑单元，其功能和性能对RSFQ超导计算机体系至关重要，本文在超导RSFQRS触发器理论分析基础上，着重对电路进行时域瞬态仿真，仿真结果直观地展现了电路各种状态和工作过程，并很好地验证了理论分析结果，这一工作对于超导RSFQ计算机体系的深入研究具有重要的价值。     

超导技术在军事领域中的应用

<正> 自从荷兰物理学家昂尼斯在1911年发现超导现象以后,一门专门研究物质在超导状态下的性能及其应用的技术——超导技术应运而生。 超导材料在超导状态下具有优异性能,如电阻为零,可输送大电流而不发热、不损耗,可长时间无损耗地存储大量电能,能产生极强磁场等,展现出广阔的应用前景。正因为如此,各国科学家长期以来一直在孜孜不倦地从事超导技术的开发和研究,并不断取得令人瞩目的成果。一方面,科学家们已发现了几千种超导材料,并在提高超导体的转变温度方面取得了突破性进展。目前高温超导体的转变温度已提高到     

氧化物超导材料的进展

从超导合成粉、超导线材、超导熔融体、超导厚膜材料、弱磁场屏蔽体及超导薄膜材料等方面介绍了氧化物超导材料及其应用的进展。     

超导技术在雷达系统中的潜在应用

本文首先扼要介绍了超导材料的开发现状,然后论述了超导技术在雷达天线、混频器、接收机、信号处理以及其它方面的应用前景。文章最后还提出了为加速超导技术的实用化进程应采取的措施。     

高温超导材料研究近况

近两年高温超导又取得了巨大的进展，特别是在：（１）新的更高温度超导体系的探索，这包括进一步提高Ｔｃ值和合成新结构、新类型的超导材料；（２）材料的应用基础研究，主要指超导块材、线材、带材、膜材料的制备和改进，包括ＳＱＵＩＤ、Ｊｏｓｅｐｈｓｏｎ结和微波无源器件；（３）对高温超导现象的解释和机理的研究方面尤为显著。本文重点介绍过去一年高温超导在材料研究方面的主要进展。     

基于FDTD的约瑟夫森结与超导传输线协同分析方法

为实现高性能处理器,超导RSFQ（快速单磁通量子）电路被提出.该电路主要由超导约瑟夫森结和超导无源传输线组成,对其建模分析是超导RSFQ电路设计的基础.本文提出了基于FDTD（时域有限差分）的约瑟夫森结与超导传输线的协同分析方法.该方法采用FDTD数值方法求解超导传输线的电报方程.在超导传输线与约瑟夫森结交界处的非线性边界条件上,采用了Newton-Raphson迭代算法.数值结果表明,本文提出的约瑟夫森结和超导传输线的协同分析方法与WRspice仿真软件相比具有相同精度,且运算效率显著提高.     

Outlook of the Superconducting Maglev

The superconducting maglev has been developed as an ultra-high speed mass transport system. It makes use of modern superconducting magnets (SCMs), which enable a large gap electro-dynamic suspension and an efficient linear motor propulsion. Running tests have been conducted smoothly on the 18.4-km-long Yamanashi Maglev Test Line since 1997 and reaped the harvests such as the maximum speed of 581 km/h, relative speed of 1026 km/h on two trains' passing test and on-board high temperature SCM running tests. In March 2005 the Committee under the Ministry of Land, Infrastructure and Transport appreciated that “all the technologies of the Superconducting Maglev necessary for the future revenue service were established.” Based on this situation, JR Central has decided to expand the existing test line as well as renew the existing facilities and equipment into those of the future revenue service level. Furthermore, the company has decided to promote the Tokaido Shinkansen Bypass project utilizing the superconducting maglev system.      

北京大学1.3 GHz射频超导加速腔研究进展

射频超导腔是超导电子加速器的核心部件,1.3 GHz 9cell超导腔被欧洲X射线自由电子激光、美国直线加速器相干光源二期等大科学装置采用,也是中国在建上海硬X射线自由电子激光装置、未来环形正负电子对撞机、国际直线对撞机等项目的关键设备.9cell超导腔的国产化、产业化对我国大科学装置的建设非常重要.本文在简要介绍超导...     

Edelstein Effect Induced Superconducting Diode Effect in Inversion Symmetry Breaking MoTe2 Josephson Junctions

Superconducting diode effect (SDE) with nonreciprocal supercurrent transport has attracted intense attention recently, not only for its intriguing physics, but also for its great application potential in superconducting circuits. It is revealed in this work that planar Josephson junctions (JJs) based on type-II Weyl semimetal (WSM) MoTe₂ can exhibit a prominent SDE due to the emergence of asymmetric Josephson effect (AJE) in perpendicular magnetic fields. The AJE manifests itself in a very large asymmetry in the critical supercurrents with respect to the current direction. The sign of this asymmetry can also be effectively modulated by the external magnetic field. Considering the special noncentrosymmetric crystal symmetry of MoTe₂, this AJE is understood in terms of the Edelstein effect, which induces a nontrivial phase shift in the current phase relation of the junctions. Besides these, it is further demonstrated that the rectification of supercurrent in such MoTe₂ JJs with the rectification efficiency up to 50.4%, unveiling the great application potential of WSMs in superconducting electronics.     

Transient Capability of Superconducting Devices on Electric Power Systems

Superconducting devices operating within a power system are expected to go through transient overload conditions during which the superconducting coil has to carry currents above the rated values. Designing the coil to remain superconducting through any possible fault scenario can be cost prohibitive, necessitating operation beyond the critical current for short periods. In order to set operating limits and design adequate protection systems for superconducting devices connected to a power system, the region of safe operation of these devices has to be described with general capability curves. Existing standards that define limits for these over-current situations are based on copper winding experience that do not apply to devices with superconducting components because of the highly nonlinear interaction between magnetic fields, operating temperature, and current density in the superconductor, and the rapidly varying material properties at cryogenic temperatures. In this paper, the behavior of superconducting coils during over-currents is discussed and a simplified capability curve is described to help standardize device capabilities. These curves are necessary to aid power system designers in appropriately designing the system and associated protection systems.      

高温超导微波滤波器研究进展

滤波器作为通信系统射频前端的关键部件,其性能至关重要。在微波频段,高温超导薄膜材料的表面电阻比普通金属铜低两个数量级以上。由于用高温超导体可以制备出性能优异的微波滤波器,并且现代无线通信系统多网络、多制式和多业务以及抗干扰的发展需求,使得小型多频带滤波器和具有抗噪声干扰的平衡滤波器的研究备受关注。研究团队长期从事该领域研究,并已取得一些研究成果。文章从不同谐振器结构类型以及频率特性等方面介绍了多频带和平衡滤波器的研究设计工作。     

Superconducting coil development and motor demonstration: Overview

Superconducting bismuth-cuprate wires, coils, and magnets are being produced by industry as part of a program to test the viability of using such magnets in Naval systems. Tests of prototype magnets, coils, and wires reveal progress in commercially produced products. The larger magnets will be installed in an existing superconducting homopolar motor and operated initially at 4.2K to test the performance. It is anticipated that approximately 400 Hp will be achieved by the motor. This article reports on the initial tests of the magnets, coils, and wires as well as the development program to improve their performance.     

Live-Grid Operation and Maintenance of the 35 kV/121MVA Superconducting Cable System

A 33.5 m, 35 kV/121 MVA, three-phase, warm dielectric HTS power cable system was successfully installed and activated in China Southern Power Grid at the Puji substation in Kunming on April 19th of 2004, supplying electricity to four industrial customers (including two metallurgical refineries) and a residential population of about 100000. In this paper, we give an update on the operation and maintenance status of the system and comments on reliability issues. We conclude that the superconducting cable system is currently quite robust and feasible for particular utility applications, and it will be improved by advancement in cryogenic equipment and system technology.     

Live-Grid Operation and Maintenance of the 35 kV/121 MVA Superconducting Cable System

A 33.5 m, 35 kV/121 MVA, three-phase, warm dielectric HTS power cable system was successfully installed and activated in China Southern Power Grid at the Puji substation in Kunming on April 19th of 2004, supplying electricity to four industrial customers （including two metallurgical refineries） and a residential population of about 100000. In this paper, we give an update on the operation and maintenance status of the system and comments on reliability issues. We conclude that the superconducting cable system is currently quite robust and feasible for particular utility applications, and it will be improved by advancement in cryogenic equipment and system technology.