Results 1 to 10 of about 1,233 (164)
Spectacled Flying‐fox conflicts—tucker, totem, taunt and threat 眼镜狐蝠的冲突——食物、图腾、挑战与威胁
Flying‐foxes worldwide have suffered population declines, including the Spectacled Flying‐fox of north‐east Australia which experienced a population crash of over 75% in <15 years. Persuading people that the Spectacled Flying‐fox is important, even vital for the rainforests and tall forests that they love, takes engagement, narrative and story‐telling.
Noel Preece
wiley +1 more source
As climate change accelerates, adaptive social protection programmes are becoming increasingly more popular than conventional social assistance programmes, since they are seen to enhance people's resilience and well‐being outcomes. Despite this upsurge, little is known about the impacts of adaptive programmes on resilience and well‐being outcomes as ...
Hare Krisna Kundo +3 more
wiley +1 more source
An emerging coastal wetland management dilemma between mangrove expansion and shorebird conservation
Abstract Coastal wetlands around the world have been degraded by human activities. Global declines in the extent of important coastal wetlands, including mangroves, salt marshes, and tidal flats, necessitate mitigation and restoration efforts. However, some well‐meaning management actions, particularly mangrove afforestation, can inadvertently cause ...
Chi‐Yeung Choi +7 more
wiley +1 more source
Global protected‐area coverage and human pressure on tidal flats
Abstract Tidal flats are a globally distributed coastal ecosystem important for supporting biodiversity and ecosystem services. Local to continental‐scale studies have documented rapid loss of tidal habitat driven by human impacts, but assessments of progress in their conservation are lacking.
Narelle K. Hill +4 more
wiley +1 more source
为研究环氧胶浸纸干式套管在受潮状态下的绝缘特性,建立了环氧胶浸纸套管电容芯体绝缘性能测试装置。基于频域介电谱(FDS)方法,测试分析了环氧胶浸纸套管电容芯体在空气中自然受潮、烘干及在绝缘气体微量水分条件下的FDS曲线变化规律,结合工频介质损耗因数和电容量测量结果,提出了环氧胶浸纸套管受潮特征参量及受潮诊断方法。研究结果表明:随着受潮程度的增加,FDS曲线向高频方向移动,且套管在低频段出现tanδ负值及负峰值,严重受潮时套管工频介质损耗因数会明显增大;环氧胶浸纸套管在绝缘气体中的受潮程度远低于空气中受潮 ...
肖遥 +5 more
doaj
绝缘子表面污层受潮是污闪发展过程中的重要环节,检测污层受潮程度对评估外绝缘性能具有重要意义。现有方法所需实验条件复杂且无法实现在线非接触检测。利用近红外高光谱对绝缘子污层受潮程度进行分析,可实现对污层受潮程度的非接触式测量,能克服传统离线检测方法的诸多不足。本研究对近红外高光谱在绝缘子污层受潮程度检测中的应用进行了研究,分别采集不同受潮程度染污样品高光谱图像,经校正处理后分别利用连续投影算法(SPA)和随机蛙跳算法(RF)提取特征波段,将提取的特征波段和全波段特征分别作为支持向量机的输入 ...
余欧然 +4 more
doaj
Diversity of culturable endophytic fungi of common reed ( Phragmites australis) in coastal wetland [PDF]
内生真菌在植物生长以及抵御环境胁迫过程中起着非常重要的生态作用.本研究从黄河三角洲滨海湿地1350个芦苇组织切片中分离得到318株内生真菌,通过对rDNA ITS的分型、测序及系统进化分析,研究了该地区芦苇植株根、茎、叶中可培养内生真菌的种类组成及在不同盐度、不同组织中的分布情况.根据序列相似性(以98%为阈值),共获得12个真菌分类操作单元(OTUs).在门级分类水平上,子囊菌门为绝对优势菌群,在各组织和站位中均有分布.芦苇根组织中分离得到的内生真菌OTU数相对较多 ...
张倩倩 +6 more
core +1 more source
水分是影响油纸绝缘套管绝缘性能的主要因素之一,对油纸绝缘套管的受潮状态开展诊断分析有重要工程价值。为研究油纸绝缘套管在不同受潮状态下的频域介电特征,文中针对正常套管和芯体受潮套管开展了频域介电响应测试,获取芯体受潮程度与介电响应的分布关系,提取了0.1 Hz至1 k Hz频率范围介损偏差平均值(average dielectric loss deviation)E(Δlg(tan δ))和实部电容比值KC′两类缺陷判断特征值。研究结果表明,水分作为强极性物质,会引起套管的绝缘电阻下降以及介质损耗的提升 ...
杨定乾 +4 more
doaj
氧化锌避雷器是电网中过电压防护的重要设备,其健康状况直接关系到电力系统的安全稳定运行。以500 kV氧化锌避雷器为研究对象,构建相应的阻容网络模型与有限元温度场计算模型,对避雷器在不同运行状态下的泄漏电流及温度分布进行仿真分析,以获取受潮等典型缺陷的缺陷特征及变化规律。根据分析结果,发生受潮时,避雷器受潮区域会呈现局部过热,流经避雷器的泄漏电流幅值随着受潮程度的加剧而增大,避雷器的相角则会随着受潮程度的加剧而减小。
刘尉 +5 more
doaj
Filling knowledge gaps in a threatened shorebird flyway through satellite tracking
Satellite tracking highlighted coastal habitats that are potentially important for shorebirds but lack ecological information and conservation recognition, such as those in Southern China and Southeast Asia. At the same time, the distributional data of tracked individuals can direct on‐ground surveys at the lesser known sites to collect information on ...
Ying‐Chi Chan +8 more
wiley +1 more source

