智能光配线网络技术的研究

智能 ODN(光配线网络)技术是将电子标签技术应用到传统 ODN中,利用电子标签标识 ODF(光纤配线架)设备端口资源。文章提出一种基于电子标签的新型光纤指环技术,用其对光纤唯一性进行标识,具有读取方便、稳定高效等优点。系统实现了光纤信息数据的自动存储与上传、监控光纤正确接入 MUMM(熔配单元盘)和光纤资源信息校准等功能,从而解决了智能 ODN技术难题。     

PTN网络环网保护技术研究

从提出和分析PTN网络保护技术现状问题出发,总结PTN环网保护对运营商的重要意义。通过研究PTN环网保护技术的原理和实现机制,对不同技术方案、技术标准的优缺点进行分析总结,同时也提出了笔者自己的观点和看法,提出了环网保护技术配置方案建议,最后对环网保护技术及PTN网络未来发展趋势进行了展望。     

Highly Conductive Carbon Nanotube‐Graphene Hybrid Yarn

An efficient procedure for the fabrication of highly conductive carbon nanotube/graphene hybrid yarns has been developed. To start, arrays of vertically aligned multi‐walled carbon nanotubes (MWNT) are converted into indefinitely long MWNT sheets by drawing. Graphene flakes are then deposited onto the MWNT sheets by electrospinning to form a composite structure that is transformed into yarn filaments by twisting. The process is scalable for yarn fabrication on an industrial scale. Prepared materials are characterized by electron microscopy, electrical, mechanical, and electrochemical measurements. It is found that the electrical conductivity of the composite MWNT‐graphene yarns is over 900 S/cm. This value is 400% and 1250% higher than electrical conductivity of pristine MWNT yarns or graphene paper, respectively. The increase in conductivity is asssociated with the increase of the density of states near the Fermi level by a factor of 100 and a decrease in the hopping distance by an order of magnitude induced by grapene flakes. It is found also that the MWNT‐graphene yarn has a strong electrochemical response with specific capacitance in excess of 111 Fg^?1. This value is 425% higher than the capacitance of pristine MWNT yarn. Such substantial improvements of key properties of the hybrid material can be associated with the synergy of MWNT and graphene layers in the yarn structure. Prepared hybrid yarns can benefit such applications as high‐performance supercapacitors, batteries, high current capable cables, and artificial muscles.     

Substrate integrated waveguide loaded by 3-dimensional embedded split ring resonators

A substrate integrated waveguide (SIW) loaded by three-dimensional embedded split ring resonators (3-DESRRs) is discussed theoretically and experimentally. The 3-DESRR structure which has proved to be an alternative magnetic metamaterial resonator for SIW structures is able to provide negative transversal permeability if excited properly. The 3-DESRR loaded SIW shows a bandpass-like response as an effect of loading the 3-DESRRs in the SIW. The lower and upper band edges of the resulting transmission line (TL) are determined by the SIW cutoff (f_c) and the resonance frequency of the 3-DESRRs, respectively. Finally, a prototype of the proposed 3-DESRR loaded SIW TL is fabricated and tested. The measured results are in good agreement with those obtained by theory and simulation.     

IGBT在铜端环焊接领域的应用

通过对超音频感应电加热铜端环焊接设备的研究,介绍了大功率IGBT在水泵转子铜端环焊接设备中的应用,拓展了感应电加热设备的应用范围。通过对铜端环焊接设备基本技术方案的确定,重点解决了IGBT串联谐振、感应器以及冷却方法,解决其设备的稳定性和实用性研究,将其推向市场,适应工业化生产的要求。     

经纱的等效长度及其变化特点

本文对织机上机经纱的等效长度进行了分析,以1511织机为例,在回转后梁和固定后梁的不同情况下,对织机上机经纱几何长度和等效长度进行了计算和对比,论述了等效长度变化的特点及其对织造工艺的影响。     

浅谈纺纱毛羽的形成与控制

详细分析了成纱毛羽的形态、成因及危害,提出减少毛羽的几项具体技术措施。     

自密实混凝土圆环约束收缩试验研究

进行了密封与沿环外侧面干燥两种条件下的自密实混凝土圆环约束收缩试验,分别研究自密实混凝土试件在自生收缩单独作用下,以及在干燥与自生收缩共同作用下钢环应变随混凝土龄期的发展规律及开裂性能,并与普通混凝土进行比较。配合比参数包括粉煤灰掺量、粉煤灰和矿渣复掺掺量、水胶比。揭示了配合比参数在两种不同条件下对钢环应变和开裂龄期的影响规律,并提出以“标准化”的钢环应变曲线作为开裂趋势曲线,以开裂系数为0.95时的龄期为“名义开裂龄期”作为圆环试验中混凝土开裂指标的建议。研究结果还表明,同一配合比参数对干燥约束收缩与自生约束收缩的作用有可能一致,也有可能完全相反,因此有必要对两种收缩分别研究;该文提出的“开裂趋势曲线”和“名义开裂龄期”能综合混凝土开裂中“作用”和“抗力”两个方面的影响,从而对混凝土的开裂性能进行动态、定量、综合的评价。     

基于RLWE的身份基认证密钥交换协议

提出了一个基于分圆环上错误学习(learning with errors, LWE)问题的身份基认证密钥交换协议,其基本思想是利用环上错误学习(ring learning with errors, RLWE)采样生成系统主私钥,进一步生成用户私钥,通过交换Diffie-Hellman临时公钥,计算用于派生会话密钥的密钥材料. 该协议与传统密钥交换协议的区别在于,协议中引入了错误项,以理想格的解码基为工具,详细分析协议的容错性,给出了合理的参数设置建议,从而保证协议以显著概率计算出相同的会话密钥. 协议在ID-BJM模型下具有可证明AKE安全性和PKG安全性,并且在双方临时私钥泄露、双方长期私钥泄露以及A的长期私钥和B的临时私钥泄露这3种情况下也可以保证协议的AKE安全.     

后量子的智能电表隐私保护方案

智能电网作为下一代的电力系统,允许电力供应商对用户数据进行高频率地数据采集以支持能耗监管、智能配电与能源管理.然而,细粒度的用户能耗相关数据也带来了安全与隐私方面的挑战,如何保护智能电网的用户隐私已经成为智能电网研究中的关键问题.当今量子计算科学正在快速发展,在抗量子计算领域基于格的密码学是相当有效的.关注智能电网的三层模型中用户电表与小区集中器的实时数据上传阶段的隐私保护问题,可利用基于格的可链接环签名来构造抗量子计算的保护用户隐私的智能电表数据采集方案.选择一个较为先进的基于格的在one-out-of-many证明之上构造的次线性大小的环签名方案,并为其增添可链接性以期为抗量子计算的隐私保护系统提供异常用户监测和追踪功能.利用后量子签名方案,该系统可以支持动态的用户加入和撤销,拥有更好的灵活性与实用性.对该系统进行安全性证明与性能分析,以表明其有效性.