Results 1 to 10 of about 471 (107)
Discharge characteristics and discharge simulation model of long air gaps containing a floating conductor [PDF]
, 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>
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Gaoya dianqi, 2022 金属化膜电容器因其自愈特性可在高电场强度下工作，但电极边缘的电场畸变导致的电极退化会使电容量下降，对电极边缘处的电场畸变程度的评估可为电容器的结构设计提供支撑。文中基于三结合点附近电场分布特点，提出了一种评估电极边缘电场畸变程度的新方法，以T型金属化膜电容器为计算模型，对有限元得到的电极附近电场的数值解，采用电场分布的理论解析式进行拟合，拟合优度在99%以上，定义拟合系数为电场畸变系数来评估电场畸变程度，并得到电极厚度、薄膜厚度和分割间隙对电场畸变程度的影响规律 ...
王佳昕 +4 more
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Gaoya dianqi, 2022 在急速温变、振动等工况下，多层热缩复合绝缘结构车载电缆终端绝缘层间容易产生气隙缺陷，气隙将导致电缆终端电场和热场畸变，引起终端内部局部放电及绝缘材料老化。文中通过有限元仿真建立了车载电缆终端气隙三维模型，分析了气隙长度、厚度及跨度对电缆终端热场和电场的影响。仿真结果表明：气隙的存在造成了电缆终端内部电场严重畸变，畸变场强达到无缺陷时的1.2～6.9倍，不同气隙规格对电场的影响有明显差异，同时气隙规格对电缆终端内部热场分布的影响程度也不同，气隙造成绝缘层温度变化3.8～12.6 ...
孙传铭 +6 more
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Research on the Absolute Measurement Methodology of Air Kerma for N-60～N-350 X-Rays [PDF]
With the rapid development of nuclear technology applications，the demand for medium- to high-energy X-rays has been increasing substantially，accompanied by urgent requirements for absolute measurement capabilities and measurement ranges of air kerma ...
Daqian HEI +4 more
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Dianci bileiqi, 2022 中国铁路接触网腕臂绝缘子冬季面临“雪闪”问题，研究多种积雪条件下，对平、斜安装腕臂绝缘子的电场特性影响，为绝缘子选型及优化提供理论依据。以QBG-25型棒式瓷绝缘子为研究对象，建立有限元电场模型，分析温度、积雪厚度、融雪覆冰厚度及污秽类型对绝缘子电场特性的影响。仿真结果表明：当温度低于0℃时，绝缘子电场强度随温度的降低先增大后减小，在-2℃时电场强度达到峰值；积雪厚度对电场强度影响呈现先增长后减小的变化趋势，各个伞裙电场强度与伞裙表面积雪形态有关，表面积雪程度严重但未完全覆盖时，电场强度畸变最严重 ...
李刚, 李彦哲, 李宝学
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Simulation of Structural Effects on Detection Efficiency in P-Type Coaxial High-Purity Germanium Detectors Using the Monte Carlo Method [PDF]
Determining the full-energy peak efficiency (FEPE) of a high-purity germanium (HPGe) detector through experimental methods or Monte Carlo (MC) simulations is crucial for accurate radionuclide quantification. This study presents a meticulously constructed
Chao WANG +5 more
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Airborne magnetotelluric measurement technology and application based on admittance tensor [PDF]
Airborne magnetotelluric method is an airborne frequency-domain electromagnetic method that measures the natural electromagnetic fields. It has the advantages of great detection depth, high measurement efficiency, minimal terrain influence, and being ...
Donghua Sun +7 more
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Gaoya dianqi, 2023 环氧树脂在直流电场下易于积聚电荷造成局部电场畸变，进而诱发沿面闪络。文中建立了考虑离子产生、复合、迁移和扩散过程的电荷积聚模型，并在模型中计及了电导率的温度特性。研究了不同温度下气固界面电势、电场、电荷的分布及功率损耗变化，分析了温度对电荷行为和电场畸变率的影响。结果表明：表面电荷密度随温度升高而增大，三结合点处电荷密度最大；温度对切向电场的影响更大，随温度升高，电荷积聚的主要方式由表面传导向体传导转变；适当升温可以提高表面电荷积聚和消散速率，但高温会使表面电荷密度和泄漏电流增大，进而加剧畸变和损耗 ...
谢子豪 +5 more
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Study on Coaxial Displacement Detection Technology of Focus Adjustment in Ultra-precise Optical Measurement [PDF]
, 2008 摘要 本课题是福建省科技计划重点项目“柔性电路FPC非电量参数在线质量控制技术研究”中的一项关键技术——实现超精密光学测量系统中调焦位移的共轴检测，解决该系统中存在的原理性误差问题，并最终提高光学测量系统的测量精度。 在应用各种光学原理实现对超精加工表面的几何量测量中，精加工表面面形及微观形貌是由位移传感器记录光学测头的离焦量而得到的。电容式位移传感器具有很多优点，是记录调焦位移的关键部件。结合实现光学测量系统测头的小型化及减小边缘效应影响等要求 ...
杨晓东
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Characteristics of electric field strengthening between coal-mineral particles under microwave irradiation [PDF]
Both thermal and non-thermal effects induced by microwave radiation can produce a series of effects on coal and rock, and microwave induced discharge is one of the phenomena of microwave non-thermal effects.
Fuqiang YANG +5 more
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