Results 21 to 30 of about 7,613 (169)
Gaoya dianqi, 2021 电缆作为高效、高可靠性的输电、供电方式,随着其应用范围的扩大,在实际运行中存在的问题也越发突出。文中就高速铁路牵引电流在电缆金属护套中产生的感应电压进行了分析计算,首先介绍了接触网计算理论,包括静电感应电压计算、电磁感应电压计算以及耦合感应电压计算。其次利用CDEGS软件对牵引电流在电力贯通电缆金属护套中产生的感应电压进行了仿真分析。最后根据计算结果说明在进行高速铁路电力贯通电缆线路设计、维护时,应充分考虑牵引电流对电力贯通电缆的影响,并采取措施把危害降低到最低程度。
牛金平
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Theoretical Study of the σ-Aromaticity in Unsaturated Three-Membered Metallacycles [PDF]
, 2016 芳香性作为化学中的一种重要概念，吸引了众多实验化学家和理论化学家的兴趣。从提供环状离域电子的种类不同大体可以分为π芳香性和σ芳香性。虽然没有明确的定义和判断方法，化学家们还是提出了许多芳香性的判据，例如结构判据芳香谐振子模型(HOMA)，能量判据异构稳定化能(ISE)和环额外共振能(ECRE)，磁性判据核独立化学位移(NICS)以及诱导的磁感应电流方法(AICD)等。其中环额外共振能，核独立化学位移和诱导的磁感应电流三种方法，可以将π芳香性和σ芳香性分开研究 ...
郝玉蕾
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Rare 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
, 2012 供应协同知识创新在企业竞争中处于核心地位,它不仅是创造新价值的根本途径,也是产生和维持供应链竞争优势的有效战略。首先介绍供应链协同和知识创新的相关理论基础,在此基础上,分析供应链协同知识创新发展的过程,建立供应链协同知识创新的网络模型;最后列举基于模块化供应链协同知识创新模型,说明企业应如何整合外部知识资源,来提高企业供应链协同知识的创新能力 ...
许锦锦, 魏文龙
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Design and experimental research of pipeline stress measurement system based on alternating current field [PDF]
, 2023 Ferromagnetic pipelines are prone to stress distortion during service, which will likely cause destructive defects, such as fatigue damage and cracks, and even major safety accidents in severe cases.
Anquan WANG +7 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang +4 more
wiley +1 more source
Gaoya dianqi, 2018 同塔多回超/特高压输电线路因其相间距和回间距小而存在较大的感应电压、电流,直接影响线路的检修、运行和接地开关设备的选型。为此,文中以兰州东至乾县的750 kV同塔双回输电线路为例,利用ATP/EMPT电磁暂态仿真软件搭建同塔双回输电线路模型,分析了两回线路之间的水平间距、运行线路长度、地线高度、土壤电阻率以及运行电流对检修线路上产生的感应电压和感应电流的影响,给出了各种典型工况下流过检修人员的人体电流大小。结果表明:检修线路上产生的感应电压、电流与水平间距基本成反比例关系 ...
史志强 +6 more
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Application of Domain Decomposition Method in Eddy Current Testing Simulation [PDF]
, 2013 随着现代制造业的发展,涡流检测仿真问题日渐复杂。传统的单一求解区域方法的运用遇到瓶颈,而分解区域方法将复杂的单一区域上的求解转化为较简单的若干个子区域上的求解,克服了传统方法遇到的困难。该文主要介绍分解区域方法在涡流检测仿真中的应用。With the development of modern manufacturing,eddy current testing simulation becomes more and more complex.The traditional method using a
孙磊, 曾志伟, 陈建民
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Moist‐electric generators (MEGs) harness energy from ubiquitous ambient humidity, which has emerged as a promising way to collect energy irrespective of location and time. This study presents a high‐performance MEG employing a bilayer Janus nanofiber membrane: a hydrophilic layer (lithium chloride/citric acid/polyvinyl alcohol) for enhanced ...
Peng Chen +7 more
wiley +1 more source
Gaoya dianqi, 2006 概括了接地开关开合感应电流的运行工况及同杆双回线路电磁感应与静电感应的产生机理;还对相关的国际、国内标准中对接地开关切合感应电流的试验方法和参数进行了归纳;介绍了中国接地开关开合感应电流的应用现状和产品情况;提出了应重视接地开关开合感应电流的必要性,并按计算结果合理地选择接地开关。
郭贤珊
doaj