为考察通信机柜在不同地震强度下的损伤情况,进行了36款通信机柜的振动台试验.根据规范要求采用人工合成地震动作为振动台试验输入.试验结果表明,满足检测标准的机柜有13个,不满足检测标准的有23个,其中有9个机柜在检测中发生倾倒.通信机柜产品质量参差不齐,抗震性能状况堪忧,可能为数据中心的正常运行埋下安全隐患.基于试验测得的加速度时程曲线,对机柜加速度放大效应进行了对比分析,发现不合格机柜的顶部加速度放大效应明显大于合格机柜,中部加速度放大效应基本相当.本文基于36款通信机柜的振动台试验检测结果,建立机柜的地震易损性模型,选取楼面峰值加速度为工程需求参数,以难以修复、丧失使用功能定义通信机柜的损伤状态.结果表明:在楼面峰值加速度达到1.1181 g时,通信机柜即有50％的概率丧失使用功能.通过与已有文献中的易损性曲线研究结果对比,发现通信机柜尺寸对其地震易损性的影响较小,但与单向地震激励相比,双向地震输入下机柜更易发生破坏、丧失使用功能.

针对目前高速科研相机的常用Cameralink视频信号传输接口需专用数据采集卡连接到计算机导致系统灵活性不够的问题,提出一种基于FPGA的Cameralink接口Deca模式下高通量数据实时交互处理方案.硬件上利用编解码芯片完成Cameralink接口的数字图像采集和转换,输出LVDS信号.软件设计采用异步FIFO完成数据缓存及转换,解决跨时钟域的时序匹配疑难.FPGA设计结合Cameralink接口最大通量数据传输协议80 bits模式10 tap/8bit格式准确数据交互.通过Modelsim仿真验证及实物测试,结果表明在sCMOS相机满帧全速2048×2048@100 fps最大85 MHz下,FPGA与Cameralink接口的高通量数据准确控制,并向下兼容Base、Medium及Full模式.具备很高灵活性及应用价值.

当前,数字经济赋能我国乡村发展取得了显著成绩,但依然存在不均衡、不充分等问题.从数字经济赋能乡村发展的供需两侧入手,总结分析供给侧短板和需求侧限制性因素,并结合乡村振兴、数字乡村等国家战略目标,提出全方位提升供给侧能力和多举措降低需求侧限制性因素影响的建议.

首先梳理了我国智慧城市的建设现状;其次总结了新冠肺炎疫情肆虐期间我国智慧城市建设成果在支撑政府管理和服务民生等领域取得的成绩和暴露的短板,分析了短板背后所隐藏的深层次原因;最后结合"5G+ABCDEI"新一代信息技术、"新基建"等与城市治理日趋深度融合的背景,提出了后疫情时代我国智慧城市的发展趋势,以期对未来我国智慧城市的建设有所借鉴.

一、引言 一般观点认为,智慧杆塔是布局于城市或乡村,基于通信网络,承载包括移动通信基站在内的多种信息通信服务设备、便民服务设备、传感设备、感知设备等各类设备设施,具备支撑多种智慧应用能力的杆型、塔型设施的总称,包括但不限于通信塔、电力塔、路灯杆、监控杆、标识杆等.智慧杆塔的功能由所搭载的设备决定,如实现通信接入、智慧照明、无线城市、气象监测、环境保护、智慧安防、充电功能、信息发布、应急广播、车路协同、一键报警等功能.由于智慧杆塔的融合功能多与信息通信技术相关,因此也被看作是ICT技术与传统公共基础设施深度融合的经典范例,如图1所示.

The technical solutions of double-cladding waveguide structure and pure SiO2core were taken,the G.654.E type ULA-130 fibre ultra-low-loss and large effective area was realized by F-doping design and optimization of the viscosity match between core and caldding.Then the study on various optical characteristics of the ULA-130 fibre was carried out,utilizing self-built optical fibre nonlinear coefficient measurement system and self-designed optical fibre macro-bending loss winding device,as well as the avaliable techniques.The attenuation coefficient,effective area and nonlinear coefficient at 1 550 nm of the ULA-130 fibre was 0.159 dB/km,133 μm2and 1.67×10-10W-1separately.According to the theoretical calculation and technical analysis,the ULA-130 fibre posseses excellent attenuation and nonlinear performance,which is applicable in high capacity,high bitrate and long-range optical backbone network system.Compared to conventional G.652.D fibre,the ULA-130 fibre could improve the optical singal-noise ration and the performance of transmission system dramatically.

With the development of optical communication network, the core layer bears large capacity services, and the network failure influences all the users, so carriers have adopted many mechanisms to protect the fiber of the core layer. As for the access network, one end is connected to client-end, and the other end is connected to the core network; in case failure occurs, a small amount of users can be influenced, and these users bear the services of narrow bandwidth and low importance, therefore the access network link is not under protection. With the enterprise users' increasing demand on bandwidth and their dependence on network connection, they gradually require their services to be protected. Because the case of fiber break may occur at anywhere, including "the Last Mile", the carriers are seeking for a protective system for the edge network and the access network link. Based on each kind of application scheme at present, this article discusses the protection of fiber link as well as the network equipment of carriers and enterprise client-end. At last, it introduces several common protective schemes.