HTS Surface Wave Resonators

A novel class of surface wave high-temperature superconductivity (HTS) resonators was investigated. The resonator consists of HTS film and one or two dielectric plates. One of the dielectric plates may be the HTS film substrate. Theoretical analysis of the resonator structure was carried out using the partial region method, with the 20 lowest waves being considered in every region. The resonant frequencies, quality of oscillations, and the field and current distributions were calculated. It was shown that there is a high-density and homogeneous microwave current flowing on the film surfaces. Experimental measurements carried out in the 3-cm wavelength range demonstrate good agreement with simulated data.     

Design and research of magnetically levitated testbed with composite superconductor bearing for micro thrust measurement

A high temperature superconducting (HTS) magnetically levitated testbed has been developed for the steady thrust measurement of miniature ion electrospray thruster.The structure of the testbed mainly consists of an HTS composite bearing,a magnetic shielding plate,an active electromagnetic brake and a laser displacement sensor.The steady thrust is described as a function of the equilibrium angle displacement of the floating frame.Furthermore,the mechanical behaviors of HTS composite beating were studied via finite element simulation and experiments,which include the load capacity,levitation stiffness and background noise.The results show that the thrust testbed can keep in low noise and have a load capacity up to 4 kg.According to the ignition testing of the electrospray thruster,the thrust force of 25.2 μN was measured by the testbed,which is close to the design value of miniature ion electrospray thruster.     

Optimum MVF Estimation‐Based Two‐Band Excitation for HMM‐Based Speech Synthesis

The optimum maximum voiced frequency (MVF) estimation‐based two‐band excitation for hidden Markov model‐based speech synthesis is presented. An analysis‐by‐synthesis scheme is adopted for the MVF estimation which leads to the minimum spectral distortion of synthesized speech. Experimental results show that the proposed method significantly improves synthetic speech quality.     

Thin‐Film‐Based Integrated High‐Transition‐Temperature Superconductor Devices

Since the discovery of superconductivity at temperatures above the technologically promising liquid nitrogen temperatures, applications based on superconductors have expanded and are being put to commercial use. However, superconductivity at higher temperatures typically occurs in complex materials requiring stringent material and environmental constraints. Such restraints make the realization and integration of these materials with normal materials a nontrivial aspect. In this progress report, unique features of these superconductors in terms of their synthesis, physical properties determining interface electrical transport, and their applications are discussed. A detailed progress report on these applications with remarks on efforts taken to integrate these devices with traditional platforms and semiconducting materials is provided.     

常温水替代沸水洗涤生产B113型高变催化剂

通过实验室和工厂试验证明,采用常温水或４０℃以下水替代沸水洗涤料浆生产 Ｂ１１３ 型高温变换催化剂的工艺是可行的。它减少了工厂生产设备, 达到降低生产成本、增加工厂效益的目的。     

高变炉改造总结

介绍高变炉内件改造原因、主要特点、催化剂更换、升温还原放硫、性能考核及运行情况。     

机载互联网的卫星通信实现方式分析和展望

本文介绍了机载互联网的国内外发展情况以及采用的技术体系和业务类型,并分析了机载互联网所涉及的国内卫星资源、电信运营商、频率规划以及飞机制造商等方方面面之间的限制和风险,旨在探讨国内尚处于试验阶段的机载互联网业务的技术发展方向。     

高温超导直线感应电机的优化设计

详细讨论了高温超导直线感应电机的结构设计和初级绕组排列方式,给出了高温超导带材临界电流和背景磁场的关系曲线。采用Maxwell有限元电磁分析软件对高温超导直线感应电机进行了详细的电磁分析,并对初级绕组匝数、初级铁心槽高和初级铁心槽宽等关键参数进行了参数扫描和优化,分析了它们对电机电磁力、初级槽漏磁通和电机临界电流的影响,提出了高温超导直线感应电机的优化设计方法。根据得到的高温超导直线感应电机优化设计参数制造了一台完全相同的铜绕组实验样机,测试了样机在不同电流和速度下的推力,对比相同条件下得到的有限元电磁仿真结果,可以得到一个修正推力仿真结果的系数,这个系数对研究不同电机参数的电机推力很有意义。     

超导电子技术在国防工业中的应用需求与应用现状分析

对超导电子技术的性能优越性及它在国防工业中的应用需求进行了详细论述;分析了超导电子技术在国内外应用发展的现状及主要差距,并对超导接收机在探月工程上实现我国的首次工程应用的情况做了简要介绍.