Results 31 to 40 of about 395 (125)
International Social Security Review, Volume 78, Issue 1, Page 29-56, January/March 2025.Abstract Street‐level professionals, such as social workers, shape policy implementation by exerting discretion. However, it remains unclear how other street‐level bureaucrats (SLBs), who are not considered to hold a professional status and who perform highly regulated activities, can do the same. Even though the decision‐making leeway of these SLBs is
Luiz Alonso de Andrade, Elias Pekkola
wiley +1 more source
, 2014 文章利用基于布里渊散射原理的BOTDR（布里渊光时域反射仪）技术研究了OPGW（光纤复合架空地线）光缆内部光纤在不同环境温度条件下的布里渊频移变化特性。研究表明,同一光缆内不同光纤的布里渊散射频移的温度系数与基础频移具有微小差异 ...
余雷 +5 more
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Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Ecosystem state transitions can be ecologically devastating or be a restoration success. State transitions are common within aquatic systems worldwide, especially considering human‐mediated changes to land use and water use. We created a transferable conceptual framework to enable multiscale assessments of state resilience and early warnings ...
John T. Delaney, Danelle M. Larson
wiley +1 more source
, 2015 基于光纤的布里渊频移特性和输电线路基本方程,建立了输电线路分布式弧垂与输电线路温度的关系,通过监测OPGW（光纤复合架空地线）的光纤频移值,获得了输电线路的温度分布,进而计算获得了输电线路的分布式弧垂。通过对比现场弧垂勘察和监测值,得出弧垂监测误差在10%以内。为输电线路的弧垂监测提供了一种安全 ...
刘洪凯 +5 more
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Leakage of biodiversity risks under the European Union Biodiversity Strategy 2030
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract The European Union Biodiversity Strategy 2030 (EUBDS) aims to regain biodiversity through enhanced forest conservation and protection, which may lead to increased timber harvest in non‐EU countries. We aimed to identify the potential leakage of biodiversity risks as induced by the EUBDS.
Richard Fischer +7 more
wiley +1 more source
, 2018 光纤复合架空地线（OPGW）是一种应用广泛的电力线缆,兼具架空高压输电地线和光纤通信载体的功能。OPGW长期工作在户外,其安全会受到环境因素和人为因素的影响,监测和维护其运行状态是电力系统正常运行的重要保障。文章介绍了基于布里渊散射的分布式光纤传感技术在电力系统OPGW状态监测方面的应用现状,讨论了目前存在的问题 ...
李永倩, 王健健
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Introducing Elinor for monitoring the governance and management of area‐based conservation
Conservation Biology, Volume 38, Issue 2, April 2024.Abstract Monitoring the governance and management effectiveness of area‐based conservation has long been recognized as an important foundation for achieving national and global biodiversity goals and enabling adaptive management. However, there are still many barriers that prevent conservation actors, including those affected by governance and ...
Shauna L. Mahajan +32 more
wiley +1 more source
Dianci bileiqi, 2020 直流系统单极大地运行时通过接地极注入大地的电流会造成系列负面影响,某直流工程系统调试期间测得临近接地极的一架空光缆线路拉线接触电势高达440 V,安全风险极高。首先分析了架空光缆系统的结构特点,发现架空光缆的吊线与接地拉线构成了一个长距离多点接地系统。对典型架空光缆系统拉线的接触电势进行了理论计算,发现拉线接触电势取决于吊线接地点间的电位差和拉线接地电阻。采用基于边界元法的仿真软件CDEGS研究了土壤、线路走廊、以及拉线参数等对接触电势的影响 ...
陈伟 +6 more
doaj
, 2015 针对OPGW（光纤复合架空地线）易发生断股的现象,提出了采用布里渊光时域反射仪测量其内部光纤应变的断股检测方法。实验中将一段OPGW的两端固定在拉力机上并施加固定的拉力值,逐渐增加OPGW中断开的单丝数,记录布里渊光时域反射仪测量的光纤应变值。实验结果表明,该方法可实现对25%以上的断股区域截面积比的监测 ...
付玉峰 +7 more
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Gaoya dianqi, 2016 500 k V输电线路架空地线通常采用一根GJ钢绞地线,一根OPGW光纤复合地线架设方式。研究表明,GJ钢绞地线采用分段绝缘、中点接地方式,OPGW光纤复合地线采用分段绝缘、一点接地方式,既可以限制地线上的感应电压幅值,减小地线感应环流及损耗,具有良好的雷电保护性能。该次研究以浙江金华一条实际运行中500 k V输电线路为对象,结合中国110750 k V架空输电线路设计规范（GB 50545—2010）、电力行业标准光纤复合架空地线（DL/T 832—2003）以及制定中的110500 k ...
马烨 +4 more
doaj