SF6气体绝缘电容式电压互感器研制

本文介绍西容公司新研制的一种完全无油化的SF6气体绝缘电容式电压互感器,提出了关键技术问题解决方案和产品绝缘结构的设计思路.并介绍了研制成功的110kV和220kV系列产品的结构、技术参数、性能指标、试验考核情况和产品特点.     

现代通信产品静电防护技术导则

本导则提出了电子通信设备机房内静电荷的产生根源及静电放电对其设备正常运行的影响机理，提出机房内环境装修的静电防护措施及静电防护操作等，从而达到有效地控制静电荷的，确保电子通信设备安全可靠运行。本导则适用于以集成电路为核心的现代通信设备机房的设计和管理。     

约束放电激励千瓦级基模CO2激光器

本文研究了约束放电激励千瓦级基模CO2激光器。约束放电激励的思想核心是:利用正交或基本正交的电场或者电磁场在阴极位降区附近形成对带电粒子的捕集阱,由此产生对放电过程中从阴极发出的带电粒子的约束作用从而影响整个气体放电激励过程。     

Flow dynamics or ‘quaking’ in gravity discharge from silos

This paper reviews the characteristics of pulsating or cyclic flow of bulk solids during gravity discharge in bins and silos. The dynamic load phenomenon is often referred to as “silo quaking” and is influenced by various factors related to the type of flow pattern developed in the bin and the flow properties of the bulk material. Of particular relevance is the influence of ‘slip-stick’ during shear flow, and the velocity at critical sections in the silo during discharge. An overview of recent and current research on this subject is presented.     

电力变压器局放超声传感器及其应用

作者研制成一种带光纤的电力变压器局放超声PZT传感器.文中分析了它的灵敏度与宽频带特性,介绍了原理、结构设计、实验数据及现场成功实例.理论与实验研究表明:具有这种高灵敏传感器的超声定位系统是确定电力变压器绝缘故障部位的一种方法.     

黄河下游平滩流量对来水来沙变化的响应

本文探讨了平滩流量对来水来沙的滞后响应规律，发现平滩流量不仅与当年的水沙条件有关，而且与前期水沙条件有关，是一定时期内的水沙条件累积作用的结果。当采用滑动平均值来反应前期水沙条件的累积影响时，得出平滩流量与滑动平均汛期流量和滑动平均来沙系数的相关程度分别在4年和5年时达到最大值。据此建立了能够反映来水流量和来沙系数前期综合影响的平滩流量计算方法，可以用来估算黄河下游主要测站平滩流量随水沙条件的变化。     

Flood frequency and routing processes at a confluence of the middle Yellow River in China

Floods cause environmental hazards and influence on socio‐economic activities. In this study, we evaluated the historic flood frequency at a confluence in the middle Yellow River, China. A non‐parametric, multivariate, empirical, orthogonal function matrix model, which consists of time correlation coefficients of flood discharge at different gauge stations and flood events was used for the analysis of flood frequency. The model addresses the characteristics of confluent floods such as frequency and the probability in multiple tributary rivers. Flood frequency analysis is often coupled with studies of hydrological routing processes that reduce the flood capacity of the rivers. Flood routing to the confluence were simulated using kinematic wave theory. Results of this flood frequency analysis showed that flooding frequency has intensified in the past 500 years, especially during the 19th century. Flooding in streams above the confluence was more frequent than in streams below the confluence. Over the last 2000 years, concurrent flooding in multiple tributary rivers accounted for 67.5% of the total flooding in the middle Yellow River. Simulation of flood routing processes shows that the decreased flooding capacity and elevated river bed of the shrunken main channel leads to an increased flood wave propagation time (24–52.3 h) in the study area after 1995. The model indicates that human activities, such as constructions of the Sanmenxia Dam, have changed flood routing boundary conditions and have contributed to the increased flood frequency at the confluence. Copyright © 2007 John Wiley & Sons, Ltd.     

A new type of arc plasma reactor with 12-phase alternating current discharge for synthesis of carbon nanotubes

A new type of arc plasma reactor with 12-phase alternating current (AC) discharge for synthesis of carbon nanotubes (CNTs) is proposed. A couple of six discharge electrodes by which have mutually electrical connection between them to enlarge the high-temperature regions in the reactor are arranged to three-dimensional locations. A new method of CNTs fabrication by this reactor, which accomplishes to enlarge the suitable growth region in high purity and at high yield, was developed.     

浍河水库泄洪洞结构优化研究

根据有限元计算原理，结合山西临汾地区浍河水库泄洪洞，对土坝下的大型软基涵洞分层填土施工过程和蓄水对结构的影响进行了模拟计算，得到了更贴近实际的涵洞结构内力和涵洞土压力分布规律，并根据实际地基条件及现有涵洞的两种常见的结构形态对涵洞结构形式进行了优化，其成果已用于设计和施工，证明了该研究方法的科学性和结论的正确性。     

丹江口工程大坝加高后的几个水力学问题

依托1∶100水工模型试验成果,重点介绍了丹江口大坝加高后的几个水力学问题如泄流能力、坝面压力特性、河床局部冲刷、下游河道流速流态、泄洪对电厂及航运的影响等.研究显示:大坝加高后泄流能力可满足设计要求,坝下河床冲刷加重,挑距加远,设计洪水22 300 m3/s时坝下冲坑最低点高程为43.0 m,各级泄量冲坑上游坡均缓于临界坡,也略缓于初期工程同级流量冲坑的上游坡;坝下600 m以内为护岸工程重点防护段,岸边流速为5.8～9.8 m/s;泄洪对丹江口电厂影响较小,对自备电站不利影响较为显著;最大通航流量6 200 m3/s时下游引航道口门区流态复杂,水流较混乱.