一种区块链网络下的去中心化存储空间交易系统

为了解决中心化存储带来的一系列问题,结合区块链、智能合约、闪电网络等关键技术,提出了一个应用于区块链网络环境下的去中心化存储空间交易系统。根据不同的订单情况提供3种数据编码方案,在保证用户数据安全的同时有效提高了存储节点的空间利用率和数据恢复效率,并增强了对于分布式存储复杂环境的适应性。此外,通过闪电网络搭建了链下微支付通道,设计了“一日一结”的租金交付机制,有效缓解了链上的数据存储压力。相比于以往的分布式数据共享存储系统,该系统同时支持去中心化、短时租赁和多币种支付,更能满足当前时代分布式存储空间租赁的需求。     

两种闪电定位资料的对比分析

为更准确地应用闪电定位资料,实现资料的共享、互补,更好地为防雷减灾服务,利用贵州省2017年ADTD、VLF/LF两种闪电定位资料,运用数理统计等方法结合SPSS、MATLAB和ArcMap对闪电频次、雷电流强度等的时间分布和雷电流强度变化等进行对比分析。发现贵州省云闪中正闪发生的概率较高,正闪比例的峰值区域集中在冬季且雷电流强度最高; ADTD的雷电流强度整体大于VLF/LF,均较符合高斯分布;从探测到的闪电次数分析VLF/LF的探测效率较ADTD高。可见两套系统探测结果存在异同,因受探测站点安装时间的制约,需要积累长时间数据进行对比分析。     

建筑物内的雷电电磁场

通信局站建筑物内的电信设备会受到雷电电磁场的干扰和危害，要有效地对这些干扰和危害进行防护，关键是要了解直击雷在建筑物内产生的电磁场分布情况。文章讨论了五种情况下，建筑物内雷电电磁场的分布。     

变电站预防雷电事故的措施

针对西山矿区雷电事故发生较多的状况,提出了架设双避雷线、通过观察找出线路重雷区和易击点、装设自动重合闸装置、做好变压器中性点的保护等预防雷害的具体措施,以达到安全供电的目的。     

Bidirectional propagation of lightning leader

The characteristics of initial leader of triggered lightning flashes are studied by use of a highspeed digital camera system with the rate of 1 000 frame per second and simultaneous measurements of current and electric field change with 0.1 μS time resolution. The results show that the altitude-triggered lightning was initiated by bidirectional propagation leader because of "current interruption" by air gap, whereas the grounded-triggered one was not. The onset of downward-moving positive leader was prior to that of the upward-going negative leader for 843 ms in an altitude-triggered lightning under the positive ambient electric field. The downward-moving leader, regardless of its polarity, would produce in-homogeneous distribution of luminosity (current) along the channel on the moment of connection to the ground.     

有独立引下线建筑物遭雷击时室内的磁场分布

用电路法分析雷电流流经引下线时建筑物金属构架上的暂态感应电流分布,根据雷电流和金属构架上的感应电流产生的动态磁矢量位,利用差分法求解室内空间的暂态磁场分布.防雷引下线和建筑物金属构架的分段支路用全耦合的π型电路来模拟,并考虑频变特性和大地的镜像作用.验证了理论分析和计算的有效性,分析了这种建筑物遭雷击时的磁场分布特点.     

高层建筑防雷接地施工技术

对呼和浩特假日酒店工程建筑物本体防雷接地、低压配电室防雷接地、弱电机房防雷接地的施工技术进行了论述。     

通信局点防雷接地方式及要求

从雷电基本知识、雷电防护的基本原则、通信局点的防雷接地方式和基本要求等3个方面,对设备防雷接地作了概述。     

建筑物的防雷与接地

根据工程实例探讨了现代建筑防雷技术,针对有关的雷害事故和损失,强调应转变观念强化防雷意识,优化防雷技术.提出了防雷设计中应注意的有关问题和可采用的具体措施.     

Spatial and temporal characteristics of VHF radiation source produced by lightning in supercell thunderstorms

The three-dimensional temporal and spatial characteristics of VHF radiation events produced by lightning discharges in three supercell thunderstorms have been analyzed based on the data measured by the lightning mapping array system with high time and space resolution. The results indicate that lightning hole (lighting free region) with about 5-6km in diameter or lighting ring (annular lighting free region) is associated with the strong updraft in thunderstorm.The lasting time of lightning holes is either short or long, being about 20min in a tornado-producing thunderstorm. The lightning holes appear before the occurrence of tornado.The lightning hole is the most obvious during the occurrence of tornado and some self-existent lighting radiation events appear at a height of 15-16km. The lightning channels of inter-cloud (IC) lightning discharge exhibit clockwise rotary structures and do not have clear bilevel structures in the vicinity of the tornado.The lightning holes are corresponding to the strong updraft region.The temporal and spatial distribution of lightning radiation events reveals the structure of strong updraft in supercell thunderstorms.Positive cloud-to-ground (CG) lightning discharges dominate in these thunderstorms and the peak of positive CG lightning flash rate appears, with the maximum of 6 per minute,after or before the occurrence of tornado.