Results 31 to 40 of about 945,626 (161)
Gaoya dianqi, 2003 利用复合接地网接地电阻的三维单元网络模型,研究了几种接地网的接地电阻值。在消耗同样的工程用料情况下,比较了各种接地体的优劣,并对影响接地电阻大小的参数（如主框和侧边辐射线长度、接地网埋深、接地导体直径等因素）作了对比。计算结果可以用来指导接地网的设计。
刘春, 何俊佳, 刘浔
doaj
Predictions of southern migration timing in coastal sharks under future ocean warming
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Projected redistribution of marine species due to ocean warming may undermine current conservation efforts. Yet, there have been few studies on how ocean warming may alter migration timing. Across 5 years of acoustic telemetry data (2018–2022), we determined environmental drivers of southward migration timing for 6 migratory shark species from
Maria H. Manz +16 more
wiley +1 more source
Gaoya dianqi, 2019 现有基于地表电位的接地网故障诊断需要测量大量的现场数据,为在减少现场测试工作量的同时提高接地网地表电位分布计算的准确性,文中提出了基于回声状态网络的接地网地表电位计算方法。首先利用接地网地表电位计算结果对回声状态网络进行训练,然后根据接地网结构对其进行网孔划分,最后使用少量的现场测试数据输入到每个区域的回声状态网络模型来计算得到接地网的整体地表电位分布。计算结果与某接地网模型的试验结果表明,文中所提方法能得到特定网孔处的接地网地表电位分布计算模型,据此可得到较为准确的接地网地表电位分布 ...
盛青 +5 more
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Conservation Biology, Volume 39, Issue 6, December 2025.Abstract As nations seek to expand protected area (PA) networks to cover 30% of land and seas by 2030 (30×30), there is an urgent need for systematic conservation planning and spatial prioritization that considers the broad range of ecological and socioeconomic factors influencing the persistence of biodiversity.
Edmond Sacre +2 more
wiley +1 more source
Beyond Motivation: Modeling the Predictive Role of L2 Pride in Informal Digital Learning of English
International Journal of Applied Linguistics, Volume 35, Issue 4, Page 1938-1952, November 2025.ABSTRACT This study investigates the role of second language (L2) pride—an understudied affective factor—in shaping learners’ language learning motivation and involvement with informal digital learning of English (IDLE). Drawing on questionnaire data from 1388 Chinese university EFL students, the study employs structural equation modeling to examine ...
Minlin Minny Zou +3 more
wiley +1 more source
, 2017 本申请公开了一种接地网故障诊断方法，包括：根据接地网中的激励电流和采集参数采集接地网多个导体的磁场数据；每个磁场数据带有对应接地网导体的标识；对采集到的磁场数据进行处理；将处理后的磁场数据通过无线通信方式发送给变电站服务器；变电站服务器根据所述接地网导体的标识，确认处理后的接地网第一导体的磁场数据小于第一预设阈值时，诊断出所述接地网第一导体发生故障。本申请对接地网的故障定位精确，检测效率高 ...
邵帅 +4 more
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Dianci bileiqi, 2013 为了更好的解决接地网散流、均压以及降阻问题,对圆环形接地网的均压特性及接地电阻进行了研究,并与传统的方形地网进行比较,采用电磁暂态仿真程序（ATP）对不形状的接地网,在雷电冲击作用下的电压大小进行仿真,以及对同一地网雷电流入地点不同时,入地点处的电压大小进行了仿真分析。结果分析表明:周长相同的圆环形地网与方形地网相比,圆环形地网的接地电阻比方形地网的小,并且雷电流入地点处的电压只有方形地网的一半左右,散流效果比方形地网好。在同跨度下,圆环地网的跨步电压也明显小于方形地网,均压效果好 ...
杨廷方, 张航, 陈智翔, 罗星辰
doaj
Dianci bileiqi, 2021 变电站接地网腐蚀断点的缺陷对变电站造成潜在的安全隐患,然而目前能用于实际的接地网腐蚀检测系统十分缺乏,为了提高大型接地网导体腐蚀断点检测的效率和精度,使用了诊断接地网地表面电磁感应密度的方法。首先在对接地网磁场分布仿真计算的基础上研制了磁场信号激励源,并结合现场实际电磁干扰特征,研制了信号采集、处理、分析系统。然后利用该系统检测大型接地网地表面磁场分布,依据磁场分布特征和规律快速确定接地网导体的断点故障及部位。最后根据仿真计算分析、试验接地网实验测试和现场应用,表明了该方法诊断接地网断点的有效性和准确性。
张树亮 +6 more
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Policy Studies Journal, Volume 53, Issue 4, Page 994-1013, November 2025.Abstract Defined by threat, urgency, and uncertainty, crises produce opportunities for government leaders to exploit and create meaning around their policy decisions in such unstable circumstances. In narrating their preferred policy solutions, one of the tools governments can use is relying on evidence‐based information.
Laura Mastroianni, Stefania Profeti
wiley +1 more source
, 2017 本申请公开了一种接地网导体的磁场检测装置，包括：磁传感器，用于根据接地网中的激励电流和采集参数采集接地网多个导体的磁场数据，并将采集的磁场数据发送给预处理模块；每个磁场数据带有对应接地网导体的标识；预处理模块，用于对所述磁传感器发送的磁场数据进行预处理，并将预处理后的磁场数据发送给微处理器；微处理器，用于对预处理后的磁场数据进行数字处理，并将数字处理后的磁场数据通过无线通信模块发送给变电站服务器，使变电站服务器根据所述接地网导体的标识，诊断对应接地网导体是否发生故障。本申请提供的磁场检测装置体积小 ...
邵帅 +4 more
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