Plasmon-Assisted Self-Encrypted All-Optical Memory

All-optical responsive nanomaterials, which can rapidly switch between two stable states, have been regarded as the next-generation memories due to their potential to realize binary information storage and implement on-chip, integrated photonic neuromorphic systems. Rare earth oxides are preeminent candidates owing to their extraordinary luminescent stability and narrow optical transitions. However, due to the lack of simple and effective optical switches, it is difficult to realize all-optical data storage, encoding, and retrieval by pure rare earth-doped luminescent nanoparticles. Here, a rapid and high-contrast of 10⁴ luminescent switching of Y₂O₃:Eu³⁺ nanoparticle between the enhancement and quenching states is achieved by employing the strong light confinement and ultrafast thermal response of localized surface plasmon resonance. A self-encrypted all-optical memory is presented with optical information writing, encryption, reading, and re-writing, and a high-sensitivity synaptic response of emitters to frequency and light intensity flux, which can be harnessed to encrypt information flows and promote convenient and high-security information encryption. Such a convenient and secure plasmonic thermally assisted self-encrypting luminescent switch paves the way for constructing high-performance stimuli-responsive rare earth oxide crystals on demand and expanding their applications in various data encryption, anti-counterfeiting, and rewritable colouration devices.     

Improvisation of Node Mobility Using Cluster Routing-based Group Adaptive in MANET

In today's Internet routing infrastructure, designers have addressed scaling concerns in routing constrained multiobjective optimization problems examining latency and mobility concerns as a secondary constrain. In tactical Mobile Ad-hoc Network (MANET), hubs can function based on the work plan in various social affairs and the internally connected hubs are almost having the related moving standards where the topology between one and the other are tightly coupled in steady support by considering the touchstone of hubs such as a self-sorted out, self-mending and self-administration. Clustering in the routing process is one of the key aspects to increase MANET performance by coordinating the pathways using multiple criteria and analytics. We present a Group Adaptive Hybrid Routing Algorithm (GAHRA) for gathering portability, which pursues table-driven directing methodology in stable accumulations and on-request steering strategy for versatile situations. Based on this aspect, the research demonstrates an adjustable framework for commuting between the table-driven approach and the on-request approach, with the objectives of enhancing the output of MANET routing computation in each hub. Simulation analysis and replication results reveal that the proposed method is promising than a single well-known existing routing approach and is well-suited for sensitive MANET applications.     

切换LPV系统的抗攻击无扰切换控制

本文针对遭受切换冲击和网络数据注入攻击影响的切换线性变参(LPV)系统,给出保护网络信息安全传输的抗攻击机制,提出一种无扰切换控制方法.首先,设计一种新颖的基于编码/解码器的抗攻击机制,可抵御恶意注入攻击信号对系统反馈通信的干扰.基于此,建立切换LPV系统的抗攻击动态输出反馈闭环控制模型.考虑到模式之间的无扰过渡问题,给出与动态输出反馈控制设计互为补充的,满足无扰切换设计需求和H∞性能指标的控制增益可行条件.在本文提出的控制律下,进一步获取了能保证切换LPV系统指数稳定性的充分条件.最后,通过数值仿真验证所提出抗攻击无扰切换控制方法的有效性.     

计及可靠性收益的配电网柔性多状态开关及分布式电源综合优化配置

柔性多状态开关(flexible multi-state switch,FMS)是支撑新型电力系统背景下配电网运行控制能力提升和可再生能源接入渗透率改善的重要技术装备,针对现有配电网中FMS的规划并未详细考虑FMS与分布式电源(distributed generation,DG)的协调配置,以及对于FMS接入带来的可靠性提升考虑不足的问题。文章在规划配置阶段详细考虑了含FMS和DG的协同优化运行,并充分计及FMS接入带来的可靠性收益,构建了基于嵌套优化的FMS和DG选址定容双层优化配置模型。针对双层嵌套规划模型求解的复杂性,提出了基于改进粒子群算法和GAMS(general algebraic modeling language)算法相结合的模型求解策略,以改造后的IEEE 33节点算例系统为例,对所提出模型和方法的有效性进行了验证,结果表明提出的方法相比传统单一FMS规划具有更好的经济性,能最大程度地降低配电网年综合费用,同时减少用户因停电带来的损失。     

基于输入电流和输出电压的Vienna整流器单管开路故障诊断方法

单管开路故障是Vienna整流器的常见故障形式,为提高单管开路故障诊断的准确性和可靠性,基于输入电流和输出电压提出了一种故障诊断方法。首先,分析单管开路故障时的故障机理,选取故障时输入电流和输出电压作为故障特征量;然后,通过检测输入电流的零值稳区和分析输出电容电压差的谐波变化,设计故障诊断方法;最后,通过仿真和实验验证了所提方法的有效性。所提出的方法结合电流、电压故障特性,在快速诊断的同时大幅提高了诊断结果的准确性和可靠性,在负载突变的情况下仍能正确工作,并且不需要添加额外的硬件设备,方便嵌入已有的控制系统中,能够实现单管开路故障的快速在线诊断。     

基于晶闸管的直流可控避雷器关键技术

电网换相换流器(LCC)与模块化多电平换流器(MMC)级联系统具备诸多独特优势,但其低压端模块化多电平换流器(MMC)由多个电压源换流器(VSC)换流器并联组成,当发生交流侧故障时会引起低压端直流母线过电压。为抑制MMC过电压问题,提出在直流母线侧安装直流可控避雷器。对交流侧故障时MMC过电压机理进行了理论分析,提出了直流可控避雷器拓扑结构。在深入分析直流可控避雷器不同运行方式的基础上,给出了直流可控避雷器的直流混合可控开关所需的极限电流耐受能力。为实现开关触发的快速性,提出在直流混合可控开关中采用串联晶闸管阀组方案。通过晶闸管Cauer计算模型仿真研究了极限电流下晶闸管阀组瞬态结温,验证了设计方案的合理性。基于某规划直流工程进行直流可控避雷器设计,并给出了主设备布置方案。基于PSCAD/EMTDC平台搭建了系统的仿真模型,验证了所提出的直流可控避雷器拓扑抑制系统MMC过电压的有效性。     

基于PTP报文的智能变电站IEEE1588交换机测试技术研究

针对智能变电站的交换机中本地时钟波动导致的时间同步系统可靠性差的问题,提出基于IEEE1588精确时钟协议（PTP）同步报文的交换机测试方法,并研发了手持式IEEE1588交换机测试仪。首先,通过协议报文获取报文时间戳、交换机驻留时间和路径延时时间;然后,计算测试仪与交换机的主从时间偏差值,得到被测交换机的同步误差;最后,通过现场测试证明所研发测试仪对交换机授时的测量和监控精度达到ns级,可满足实际应用需求。     

5G毫米波通信用低插损高隔离GaAs PHEMT单刀双掷开关

基于0.15μm GaAs赝配高电子迁移率晶体管(PHEMT)工艺,实现了一款用于5G毫米波通信的低插损高隔离单刀双掷(SPDT)开关芯片。为了降低插损,每个开关支路通过四分之一波长阻抗变换器连接到天线端,并通过优化传输线和器件总栅宽实现了良好的端口匹配;为了提高隔离度,采用了三并联多节枝的分布式架构形成高的输入阻抗状态,实现信号的全反射。芯片面积为2.1 mm×1.1 mm。在片测试结果显示,在24.25~29.5 GHz的5G毫米波频段内该SPDT开关实现了小于1.1 dB的极低插损和大于32 dB的高隔离度,1 dB压缩点输入功率大于26 dBm。     

Monolithically integrated CoP nanowire array: An on/off switch for effective on-demand hydrogen generation via hydrolysis of NaBH<Subscript>4</Subscript> and NH<Subscript>3</Subscript>BH<Subscript>3</Subscript>

The issues of hydrogen generation and storage have hindered the widespread use and commercialization of hydrogen fuel cell vehicles.It is thus highly attractive,but the design and development of highly active non-noble-metal catalysts for on-demand hydrogen release from alkaline NaBH4 solution under mild conditions remains a key challenge.Herein,we describe the use of CoP nanowire array integrated on a Ti mesh (CoP NA/Ti) as a three-dimensional (3D) monolithic catalyst for efficient hydrolytic dehydrogenation of NaBH4 in basic solutions.The CoP NA/Ti works as an on/off switch for on-demand hydrogen generation at a rate of 6,500 mL/(min.g) and a low activation energy of 41 kJ/mol.It is highly robust for repeated usage after recycling,without sacrificing catalytic performance.Remarkably,this catalyst also performs efficiently for the hydrolysis of NH3BH3.