宝鸡峡渠首加坝加闸工程灌溉引水洞封堵处理

主要阐述了宝鸡峡渠首加坝加闸工程灌溉引水洞封堵堵头设计和其薄弱环节的处理措施等 ,对类似工程的设计处理有一定的参考价值     

宝鸡峡渠首加坝加闸工程坝段岩基L_0缓倾角裂隙处理

宝鸡峡渠首加坝加闸工程 坝段基岩存在L0缓倾角裂隙,针对其特点,提出两种处理方法;根据工程进度计划、工程投资经济性、和工程质量的要求进行技术经济分析,采用大开挖的处理方法。     

金盆水利枢纽安全监测基准网稳定性分析

本文主要介绍金盆水利枢纽工程安全监测网的建立,监测控制网的设计、大坝监测稳定性和观测精度分析。     

宝鸡峡渠首加坝加闸工程Ⅲ坝段岩基L0缓倾角裂隙处理

宝鸡峡渠首加坝加闸工程Ⅲ坝段基岩存在L0缓倾角裂隙,针对其特点,提出两种处理方法;根据工程进度计划、工程投资经济性、和工程质量的要求进行技术经济分析,采用大开挖的处理方法.     

"堤岸防护裙台"在宝鸡峡渠首加坝加闸水利水电工程中的应用

鉴于地形、地质条件,采用体形小,造价低,防冲效果好的国家专利"堤岸防护裙台",减少水流对引水渠首南大墙基础的冲刷,保护南大墙的安全稳定。     

宝鸡峡渠首Ⅱ坝段闸墩裂缝分析与处理

通过对宝鸡峡水利水电工程闸墩裂缝产生原因分析及处理 ,提出了相应条件下防裂和裂缝处理的措施 ,为以后工程提供借鉴     

宝鸡峡渠首工程右岸滑坡原因分析及处理设计

宝鸡峡渠首工程右岸岩体滑坡 ,是内外因素相互作用的结果 ,通过对该工程滑坡产生机理的研究分析及采取相应处理措施的论述 ,表明了在工程建设当中 ,地质工作应该给予足够的重视 ,工程施工应严格遵循规范 ,也只有这样 ,才能确保工程建设的质量和进度。     

弹性聚氨酯材料在宝鸡峡加闸工程冲砂底孔抗冲磨防护上的应用

宝鸡峡渠首加坝加闸工程冲砂底孔闸墩及闸室墙体表面使用弹性聚氨酯材料涂层的施工方案,取得了较好的效果,提供了水工建筑物混凝土表面抗冲磨研究的新思路和新方法,具有较好的发展前景和推广价值.     

瀑布沟水电站平面变形监测控制网设计

瀑布沟水电站平面变形监测控制网为水电站安全的重要组成部分。介绍了瀑布沟水电站平面变形监测控制网监测网点的布置,按最小二乘法对平面变形监测精度进行估算,结果显示全网最弱点精度均满足设计要求。由对平面变形监测控制网内部可靠性和外部可靠性分析可知,所有观测边长及观测方向可靠因子均符合现行规范要求。通过在基准点布设倒垂线、采用统计检验法校核其基准点的稳定性,以满足监测控制网点观测的高精度要求。     

瀑布沟水电站垂直位移监测控制网设计

鉴于垂直位移观测是监测各种工程建筑物和地质构造的重要手段,设计了瀑布沟水电站垂直位移监测控制网,基于精度评估原理,采用平差计算方法对垂直位移监测控制网进行了精度估算,并总结了水库蓄水后重力场变化对水准测量的影响及高差改正。结果表明,垂直位移监测控制网设计精度满足规范要求,建议在水库蓄水前后进行重力观测。     

洛河渡槽安全监测的布设方法及精度分析

介绍了洛河渡槽安全监测基准网和变形点测量的精度设计分析、布设和建造、观测方法及数据处理分析,对观测的结果进行精度分析,所选定的观测方案论证其可行性及经济性,并提出了个人的一些体会.     

石砭峪水库除险加固工程大坝安全监测系统的更新改造

石砭峪水库是定向爆破筑坝,该工程除险加固需要对安全监测系统进行更新改造,其观测项目及监测自动化系统具有典型性。     

Preliminary safety analysis for the SCWR-FQT facility

In recent years, a substantial number of theoretical, numerical and experimental R&D activities are carried out on the supercritical water-cooled reactor (SCWR), which proposed as one of the Generation IV nuclear power plants by the Generation IV International Forum (GIF). A research plan has been proposed by GIF on the designing and licensing of a SCWR prototype, which is planned to be constructed and operated in the near future. In the preliminary stage of this research plan a fuel assembly, with its experimental loop, will be constructed and tested in SCWR operating conditions. This article reviews the research activities carried out in the Supercritical Water Reactor Fuel Qualification Test (SCWR-FQT) project in Europe and Super Critical Reactor In-Pipe Test Preparation (SCRIPT) project in China. These research activities studied both neutronic and thermal–hydraulic behavior of the test fuel assembly and auxiliary systems of SCWR fuel test facility. CFD simulations, subchannel analysis and system simulations coupled with neutronics code are performed to study the performance of the tested fuel assembly, especially safety related aspects.     

水电工程大坝外部变形监测的施工

大坝外部变形安全监测的诸多项目 ,大多是近十数年来才开始在水电工程上逐渐被采用的 ,虽然作为水平位移监测项目之一的倒垂线法由来已久 ,但其施工的难度是水电行业共认的。本文即是从这方面入手 ,结合黄河大峡水电站工程的施工实践 ,总结了一些施工经验 ,以供交流参考     

智能电网中的一次设备有关数据分类和网络结构

对智能电网中一次设备的数据分类、网络结构进行了讨论。数据分为5大类,即基本数据、运行数据、试验数据、在线监测数据和事故数据。数据网络分为3层结构,即贮存、采集、应用。对数据和网络之间的关系进行了分析。同时还讨论了近期需要开展的工作。     

A bibliometric analysis on safety of fuel cells: Research trends and perspectives

Fuel cells, as energy conversion devices, are receiving attention from researchers and developers due to their high efficiency and environmentally friendly characteristics. However, despite the prospect of booming fuel cell development, the overall quality and level of development still need to be improved, and safety is one of the key development indicators. This article presents a scientometric and knowledge network analysis of fuel cell safety based on information from 890 relevant publications in the Web of Science Core Collection. The bibliometric software VOSviewer and Co-Occurrence are used for in-depth analysis and visual presentation of the publication information. The results show that the first publication is released in 1991, and this research field has exploded since 2017. Moreover, the USA and China have the strongest cooperation in this field. The hot areas of fuel cell safety research are focused on five clusters: electrode and catalyst safety, fuel cell electric vehicle safety, hydrogen safety, energy generation and storage safety, and solid oxide fuel cell safety. This article maps the knowledge of research related to fuel cell safety and helps readers gain a quick perspective on the research structure and future directions in this field.     

闸阀阀座外压分析

本文介绍了闸阀阀座受外压作用的概念,并使用应力分析设计方法对闸阀阀座进行了应力强度校核。     

电站锅炉煤粉参数远程监控系统的软件设计与实现

电站锅炉煤粉颗粒参数在线监控对于锅炉优化控制有着重要的参考作用.为了实现煤粉管道内颗粒的细度、浓度、速度的实时监控,通过模块化的程序设计方案,设计了数据采集系统的上位机软件.该软件通过自定义控件实现了系统组态、实时曲线与柱状图数据显示、保存等功能.同时利用多线程和通道自动分配方法实现了单通道采样频率达1 MHz的数据快速采集与处理,并基于Modbus通讯协议实现了与DCS(Distributed Control System)的即时通讯.在电站长时间投入运行的结果表明,该系统具有良好的稳定性与可靠性,各项功能均满足锅炉运行与优化控制要求.     

Fault location method for petal-shaped distribution network with inverter-interfaced distributed generators

In this paper, a fault location method for the petal-shaped distribution network (PSDN) with inverter-interfaced distributed generators (IIDGs) is proposed to shorten the time of manual inspection. In order to calculate the fault position, the closed-loop structure of the PSDN is skillfully exploited, and the common control strategies of IIDGs are considered. For asymmetrical faults, a fault line identification formula based on the negative-sequence current phase differences is presented, and a fault location formula only utilizing the negative-sequence current amplitudes is derived to calculated the fault position. For symmetrical faults, the positive-sequence current at both ends of lines and the current output from IIDGs are used to identify the fault line, and the positive-sequence current on multiple lines are used to pinpoint the fault position. In this method, corresponding current phasors are separated into amplitudes and phases to satisfy the limitation of communication level. The simulation results show that the error is generally less than 1%, and the accuracy of the proposed method is not affected by the fault type, fault position, fault resistance, load current, and the IIDG penetration.