Results 71 to 80 of about 24,356 (164)
Dianci bileiqi, 2014 在深入研究各种输电线路雷击跳闸率计算方法并结合目前各网省公司线路管理现状的基础上,提出了输电线路雷击跳闸率预评估、再评估的层进式评估流程,并利用Visual Studio高级程序设计语言开发了一套输电线路雷击跳闸风险评估系统。该风险评估系统综合应用规程法、改进电气几何模型（EGM）、Google Earth地理信息软件和ATP/EMTP仿真计算等技术,评估范围覆盖了雷电绕击、反击等主要雷害型式,评估模型涉及线路地理特征信息、线路结构特征信息等影响要素,评估结果量化分析了各要素对雷击风险的影响 ...
王平, 李琳
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Conservation Biology, EarlyView.Abstract Targets 1 and 3 of the Kunming–Montreal Global Biodiversity Framework (KMGBF) require actions to focus on areas of importance for biodiversity—a prerequisite for reversing biodiversity loss and halting human‐induced extinctions as set out in the Mission and Goals of the KMGBF.
Felicia A. Collins +6 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract Protected areas cannot halt biodiversity loss in isolation; integrating them with surrounding human‐dominated landscapes is critical. However, this integration is challenged by substantial landscape heterogeneity at protected area borders, making it difficult to determine cross‐border changes in ecosystem service provision.
Alberto González‐García +7 more
wiley +1 more source
Dianci bileiqi目前已有的复合绝缘子状态评估方法多采用赋权求和的办法量化评估结果，在进行评估时需要重复繁琐的得分计算，无法做出快速评估。为此本文提出一种基于改进组合赋权与机器学习的复合绝缘子状态评估方法，先通过性能检测获得备选评估指标，使用相关性检验对状态评估指标进行筛选，然后根据改进的组合赋权法量化复合绝缘子的性能状态，通过得分进行状态等级划分。最后将评估指标与评估结果用于柯西变异麻雀算法改进的支持向量机的训练，通过调用训练好的改进支持向量机模型实现复合绝缘子状态的快速评估 ...
刘威
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Gaoya dianqi, 2016 电力变压器作为电力系统的枢纽设备,其运行状态直接影响电力系统的可靠性。因此,评估电力变压器的运行状态继而采取科学合理的维修策略具有重要意义。针对多台电力变压器状态评估排序问题,提出了一种新的评估方法。首先分析确立了电力变压器状态评估指标,然后根据区间层次分析法（interval-based AHP,IAHP）确定了电力变压器状态评估指标的指标权重。结合区间数和TOPSIS法,建立了基于区间数TOPSIS法的电力变压器状态评估模型,最后根据相关数据对8台变压器的状态进行了评估。计算结果表明 ...
卜宪存, 张海英
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Assessing and quantifying variations in the functioning of marine food webs across scales
Conservation Biology, EarlyView.Abstract The mismatch between the scale of ecological processes and management decisions represents a significant challenge in marine conservation. This misalignment can result in ineffective conservation measures and compromise the sustainability of marine ecosystems.
Izaskun Preciado +16 more
wiley +1 more source
基于因子分析法与D-S证据理论的变压器关键参量提取和状态评估
Gaoya dianqi, 2016 变压器的状态评估是运行、检修与维护的重要依据,而变压器的评估参量类型冗余、数量繁多等是该环节工作的难点问题。针对上述问题,该文在深入分析变压器状态评估的需求和研究现状的基础上,构建了基于关键评估参量体系及D-S证据理论的多层次综合模糊评判模型。首先利用因子分析法提取并构建了关键参量指标体系;其次结合层次分析法获得评价系统中各子指标的最优权重,从而依据各自隶属度函数获得各项目层的评价结果;最后依据D-S证据理论对各项目层的评估结果进行了融合评估决策。经实例分析,该模型能有效且合理地对变压器状态进行评估。
曾丹乐 +5 more
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The Academic Literacy of International Postgraduate Students in Australia: A Cause for Concern?
International Journal of Applied Linguistics, EarlyView.ABSTRACT This article discusses the academic literacy challenges faced by international postgraduate students at a South Australian university and evaluates the effectiveness of existing institutional support mechanisms. Drawing on survey data, the study highlights significant difficulties in academic reading, writing, and spoken communication, with ...
Werner Botha +6 more
wiley +1 more source
Gaoya dianqi, 2017 为了进一步提高架空输电线路状态评估结果的准确性,文中首先研究了输电线路各监测参量在反应设备状态中的灵敏度,构建了基于主成分分析法的输电线路状态评估指标体系,明确了状态评估的数据需求;然后建立了输电线路状态评估的贝叶斯数学模型,并进行了实例验证;最后基于多源数据平台,设计开发了输电线路状态评估专家系统,将研究成果予以实现。结果表明,文中提出的输电线路状态评估指标体系更具有针对性,状态评估方法有效可行。
常安 +4 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
wiley +1 more source