Results 1 to 10 of about 3,006 (116)

Discharge characteristics and discharge simulation model of long air gaps containing a floating conductor [PDF]

open access: yes, 2022
Long air gaps containing a floating conductor are common insulation types in power grids. During the transmission line live-line work, the process of lineman entering the transmission line air gap constitutes a live-line work combined air gap, which is a
Gao, Jiachen <1995>
core   +1 more source

并联复合绝缘子覆冰过程中的流场特性研究

open access: yesGaoya dianqi, 2021
中国南方冬季极易发生大面积冰灾,覆冰容易造成绝缘子电气特性下降,所引发的事故严重威胁输电线路安全,因此有必要探索绝缘子覆冰特性。目前,国内外学者针对单串绝缘子的覆冰特性进行了大量且深入的研究,而针对特高压输电线路广泛使用的并联多串绝缘子覆冰特性研究还尚未见报端。故文中利用Fluent流场软件对并联复合绝缘子串覆冰过程中的流场特性进行研究,结果表明:覆冰过程中空气会在绝缘子的背风面形成漩涡,相对软风情况下气流越强则漩涡越明显;绝缘杆径周围气流分布会因风速变大而不均匀,且流速增大 ...
陈吉, 蒋兴良, 陈成瑞, 李新梁
doaj  

试验回路参数对污染条件下绝缘子电气特性的影响研究

open access: yesGaoya dianqi, 2021
绝缘子是电网中最常用的电气设备之一,对于保证电网安全运行具有重要作用,但实际在运绝缘子的电气特性与高压实验室得出的结果存在一定差异。为此文中提出了一个考虑试验回路—绝缘子相互作用的数学模型,用于模拟污秽条件下复合绝缘子和瓷绝缘子的电气特性,通过与实际试验结果进行了对比验证了模型的有效性;最后计算分析了试验回路参数、ESDD、绝缘子伞裙结构、电压等级、试验布置等因素对绝缘子电气特性的影响。结果表明,文中提出的模型能够有效模拟具有不同表面润湿性或疏水性的复合绝缘子的电气特性 ...
唐静宜, 唐波, 金广厚, 刘路明
doaj  

特殊工业粉尘地区复合绝缘子蚀损老化特性研究

open access: yesGaoya dianqi, 2021
在特殊工业粉尘地区运行的复合绝缘子,由于粉尘中含有金属微粒、酸性腐蚀性物质、糖类等吸水性物质等成分,容易在运行过程中出现绝缘子伞裙蚀损与烧蚀的情况。为研究特殊工业粉尘环境下复合绝缘子长期运行中的伞裙蚀损与烧蚀对绝缘子老化的影响,文中对某特殊工业地区退出运行的复合绝缘子进行取样,选取具有典型形貌特征的复合绝缘子伞裙,分别对试品的表层和内部进行采样及对比分析,同时选取外观完整的绝缘子与烧蚀严重的绝缘子样品进行对比分析。文中通过傅里叶变换红外光谱 ...
毕晓甜   +6 more
doaj  

Preparation and performance optimization of iron-based soft magnetic composites based on CaO insulating layer and FexOy transitional interlayer [PDF]

open access: yes
To explore the application potential of calcium oxide (CaO) as the insulating layer in soft magnetic composites, a strategy of introducing FexOy as the intermediate transition layer between the CaO insulating layer and the iron matrix was proposed to ...
HE Hao   +5 more
core   +1 more source

The Two Faces of Introgression in Conservation Biology 基因渗入在保育生物学中的双重面貌

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 339-344, September 2025.
Conservation biologist need to take into account the various aspects of introgression in their attempts to protect the species integrity and evolutionary potential of threatened species. To do so, they have to overcome the bias created by the Mayrian species concept that considers species as having distinct gene pools.
Harald Schneider, Charles H. Cannon
wiley   +1 more source

Realization mechanism and performance of room-temperature gas sensors [PDF]

open access: yes, 2016
降低工作温度对于提高气体传感器的安全性,增加便携式或可穿戴设备的续航时间和组建高可靠性的无线传感网络有至关重要的作用。然而对于金属氧化物气体传感器来说,工作温度的降低并不是一件简单的事情。任何定量检测的本质都是事先构建一个可量化的不稳定平衡,然后让待测物打破这个平衡来获得响应。把传感器看作一个封闭系统,工作温度的降低意味着系统稳定性的增强,以至于在较低的温度下电流(或电压)平衡难以被痕量待测气体的出现所打破。近年来有研究表明借助紫外光活化可以显著地降低气体传感器的工作温度,甚至实现了对多种气体的室温检测,
刘彬
core  

‘Where else can they go?’: Violence, resistance and the socio‐cultural trajectories of Kashmiri women in Freny Manecksha's Behold I Shine: Narratives of Kashmir's Women and Children

open access: yesSexuality, Gender &Policy, Volume 7, Issue 4, Page 348-365, November 2024.
Abstract In the armed conflict between Kashmiri militancy and the Indian state forces, Kashmiri women have been relentless victims of abduction, rape, molestation, and cruel objectification by the militaristic patriarchs of both sides. In the context of the state's unaccountability, the rebuttal of justice is horrific in Kashmir.
Payel Pal, Goutam Karmakar
wiley   +1 more source

Growth of HfO2 thin film by Remote Plasma Atomic Layer Deposition and the properties of HfO2/Ge interface [PDF]

open access: yes, 2016
随着器件等比例缩小难度和成本的不断增加,以Si作为沟道材料SiO2作为栅介质的传统CMOS发展接近物理极限,高K介质HfO2栅高迁移率Ge沟道MOSFET成为未来CMOS集成电路技术发展的潜在选择之一。然而metal/HfO2/Ge结构MOS器件存在界面态密度高、栅极漏电流大等问题,因此研究高质量HfO2薄膜生长技术和减少HfO2/Ge界面态是提高metal/HfO2/GeMOS器件性能的有效途径之一。 本文采用远程等离子体辅助原子层沉积法(RP-ALD)生长HfO2薄膜,优化了HfO2薄膜的生长(温度)
池晓伟
core  

Si( 100) 表面Se 薄膜生长及其在Ti /Si 欧姆接触中的应用 [PDF]

open access: yes, 2011
National Basic Research Program of China [2007CB613404]; National Natural Science Foundation of China [61036003, 60837001]; Natural Science Foundation of Fujian Province of China [2008J0221]We have investigated the growth of thin selenium layer on Si ...
Chen Song-Yan   +11 more
core  

Home - About - Disclaimer - Privacy