Results 51 to 60 of about 15,245 (165)

±800kV特高压直流换流站极母线金属氧化物避雷器的研究

open access: yesGaoya dianqi, 2016
极母线金属氧化物避雷器是±800 k V特高压直流换流站的关键过电压保护设备之一,其技术研究和产品开发是实现特高压直流设备国产化的一个重要课题。笔者以中国哈密—郑州特高压直流工程为依托,深入研究了±800 k V特高压直流换流站极母线金属氧化物避雷器的关键技术,包括:1大直径直流金属氧化物电阻片技术;2复合外套技术;3多柱电阻片柱并联技术;4悬挂安装技术等。产品通过了全部的型式试验项目,成功地应用于±800 k V哈密—郑州特高压直流工程中,填补了国内特高压直流极母线避雷器领域的空白 ...
胡淑慧
doaj  

Research of laser and solar hybrid powered system for Active optical-electronic current transformer [PDF]

open access: yes, 2011
随着电力工业的不断发展,电网电压等级的不断提高,对电压、电流的测量要求也在不断提高。传统的电磁式互感器无法满足迅速发展的数字化电网电压的测试要求。目前电子式(光电式)互感器已成为电网中高电压、高电流测量新的研究热点,有源式光电电流互感器是新型互感器研究的典型代表,而高压端的供能是有源式光电电流互感器的关键部件之一。目前研究的主要有线圈从母线上取能、高压电容分压式供能、激光供能、蓄电池供能、超声电源供能等供能方法。 本文在光电互感器基本原理理论研究的基础上,对上述各种供能方法进行分析研究,结合激光供能 ...
孙存淼
core  

The Dependence of Properties on Structural Features in Macro/Micro Levels for PBF‐LB Fabricated Porous NiTi Alloy

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng   +7 more
wiley   +1 more source

A Research onThe International Strategy of SGCC [PDF]

open access: yes, 2015
在经济全球化和世界能源电力发展进程中,国际化是中国企业的需要和选择。 近年来,中国中央企业把“做强做优,世界一流”作为改革发展的核心目标,积极 实施“走出去”战略。作为全球最大的公用服务企业,中国国家电网公司大力实施 国际化战略,推进企业发展方式、电网发展方式转变,取得显著成效,同时也存在 风险和挑战。研究国家电网公司的国际化实践与探索,对进一步推动中国企业国际 化具有重要意义。 本文第一章介绍选题原因,论文的目的和意义,研究的内容和方法及论文框架 结构。第二章阐述企业国际化战略相关理论 ...
傅仰坚
core   +1 more source

Crystallization Engineering of GaAs/Sb2S3 Core‐Shell Nanowires for Gain Manipulation of Photodetectors

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Photodetectors, based on GaAs nanowires (NWs), hold significant promise in the fields of high integration micro‐ and nano‐optoelectronics applications because of their outstanding electronic and optical properties. To date, significant efforts have been directed toward enhancing the performance of photodetectors, aiming for high detectivity ...
Yu Hao   +11 more
wiley   +1 more source

特高压变压器交流耐压及局部放电试验装置

open access: yesGaoya dianqi, 2009
综述了国内外特高压电力变压器交流耐压和局部放电试验装置的现状;以武汉高压研究院特高压试验基地1 000 kV变压器的试验数据为参考,提出了特高压电力变压器的交流耐压和局部放电的试验方法和试验电路。论述了装置中变频电源和高压电抗器的设计方法;进行了750 kV电压等级超高压电力变压器的交流耐压和局部放电试验,对试验数据进行了分析。试验结果证明了该试验装置及试验方法的合理性,同时表明该试验装置具有可靠性高、安全性好、实用性强的特点。
仇新艳   +4 more
doaj  

Gravity‐Driven Inclination Sensor Based on Liquid Metal Interface Migration in Anisotropic Microchannels for Information Transmission and Continuous Surface Topography Scanning

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo   +6 more
wiley   +1 more source

右美托咪啶在老年高血压患者手术麻醉中应用研究进展

open access: yesZhongguo shiyan zhenduanxue, 2018
高血压病是一种威胁人体健康的常见疾病,其主要特征为动脉压升高,是最常见的心血管疾病之一。老年高血压与中青年高血压的临床特点有很大差别,其特点主要表现为以单纯收缩性高血压为主、脉压差大、血压昼夜异常 ...
乔昕, 王炼, 艾攀, 沈文振
doaj  

A Micro‐Nano Flower‐Like Na3V2(PO4)3@C Constructed by Polar‐Driven H‐Bond Engineering Toward High‐Rate Sodium Storage

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT The polyanionic compound Na3V2(PO4)3 (NVP) has emerged as a competitive cathode material for sodium‐ion batteries (SIBs), owing to its high‐voltage redox activity (3.4 V vs. the Na+/Na reference couple) and NASICON‐type framework that enables superior ionic conductivity.
Xiaolei Wu   +5 more
wiley   +1 more source

特高压直流极母线避雷器运行安全测试技术研究

open access: yesDianci bileiqi, 2020
特高压直流极母线避雷器在运行过程中容易出现电流涌动干扰,会对其运行安全性产生不良影响。提出了一种基于直流振荡频率负阻尼特性分析的特高压直流极母线避雷器运行安全测试技术。以电压、基线电流、电磁感应强度等参数为约束参数,模糊相关性融合特征量方程;建立特高压直流极母线避雷器的稳态控制模型;基于直流振荡频率负阻尼特性,采用模糊信息融合方法进行特高压直流极母线避雷器运行状态的稳态模型构造;建立特高压直流极母线避雷器运行稳态特征方程,结合正阻尼重构的的稳定控制方法进行特高压直流极母线避雷器运行状态特征分析 ...
赵珏斐, 芮新花
doaj  

Home - About - Disclaimer - Privacy