Results 21 to 30 of about 1,177 (166)
Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Eradicating invasive predators from islands can result in substantial recovery of seabirds, but the mechanisms that drive population changes remain poorly understood. Meta‐analyses have recently revealed that immigration is surprisingly important to the recovery of philopatric seabirds, but it is not known whether dispersal and philopatry ...
Jeremy P. Bird +2 more
wiley +1 more source
Design and Implementation of Digital Archives Management System Based on SOA [PDF]
, 2015 信息技术的蓬勃发展，以及国内党政机关对信息系统需求的不断深化，一方面也加剧了机关对信息技术（软件系统）的依赖，另一方面也迫切需要机关本身不断的发展自身的信息化水平。随着信息化的不断推进，同时党政机关本身各类应用产生海量的非结构化数据，而且大部分都存在归档需求。因此，如何有效管理档案正逐步成为党政机关十分关注的问题[1] 目前传统档案管理未给予档案资料管理和利用的重要力度，主要体现在归档范围不明确、档案收集随意性大；归档分类不规范、著录标准不一致；保管手段单一、损坏或丢失严重；重“藏”轻“用 ...
唐征
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Disasters, Volume 48, Issue S1, July 2024.Abstract Mangrove forest is an ecosystem‐based solution for disaster risk reduction in the Philippines, but its historical deforestation has hampered its capacity to protect coastal communities. With the increasing occurrence of storm surge in the Philippines, mangrove reforestation projects have received renewed attention, but many have failed ...
Gian Powell B. Marquez +1 more
wiley +1 more source
Gaoya dianqi, 2020 包封受潮是导致干式空心电抗器匝间绝缘失效的重要诱因,文中通过对故障退运电抗器的解剖分析以及匝间绝缘材料的湿热老化试验,研究包封受潮对干式空心电抗器匝间绝缘的破坏作用。首先,解剖了一台南方地区故障退运的电抗器,利用扫描电镜、傅里叶红外光谱仪、断裂拉伸试验等对样品的理化性能进行分析,推断受潮后包封内部绝缘的变化过程;然后,进一步对作为匝间绝缘材料的PET聚酯薄膜进行了湿热老化试验,研究了其在不同湿度老化条件下击穿场强、断裂伸长率的变化。研究表明:干式空心电抗器有可能严重受潮 ...
李浩, 晏年平, 贾志东
doaj
Gaoya dianqi, 2016 绝缘子表面污秽电导率对污闪预警具有重要作用,然而绝缘子表面污秽分布不均,其形成的微小电容对表面电导率的检测产生较大影响。为克服该影响,文中研制了基于相角差的绝缘子表面污秽电导率检测系统,详细介绍了系统检测原理以及系统关键部分的设计和仿真,并在实验室进行了污秽受潮试验,分析了污秽表面电导率随受潮时间的变化规律。结果表明:污秽干燥时,表面电导率很小;随着受潮的进行,表面电导率不断增大;污秽饱和受潮时,表面电导率达到最大;污秽过饱和受潮、流失时,表面电导率不断减小。因此,可将污秽受潮过程分为3个区段,受潮区 ...
钟荣富 +4 more
doaj
NETSTARS 模式加入橋墩沖刷功能之研究─以八掌溪為例 [PDF]
, 2014 This study applies NETSTARS V3.0 by adding the calculation functions of eighteen pier scour formulas based on a comprehensive literature review to demonstrate local scour mechanisms. The study area is a reach of the Pachang Creek from the Housheng Bridge
Guan-Ming Luo +5 more
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Importance of habitat heterogeneity in tidal flats to the conservation of migratory shorebirds
Conservation Biology, Volume 38, Issue 1, February 2024.Abstract Understanding species distribution patterns and what determines them is critical for effective conservation planning and management. In the case of shorebirds migrating along the East Asian‐Australasian Flyway (EAAF), the loss of stopover habitat in the Yellow Sea region is thought to be the primary reason for the precipitous population ...
Shangxiao Cai +4 more
wiley +1 more source
Dianci bileiqi, 1996 瓷套型避雷器受潮是个频发性的缺陷。通过乌溪江水电厂２２０ｋＶＭＯＡ受潮的实例，对每相两节ＭＯＡ中一节受潮时的运行状况进行计算分析，绘制出不同受潮程度下的电压、电流向量图，以较清晰地描述ＭＯＡ带缺陷运行状态，并指出装设全泄漏电流监测表计的有效性。
鲍敏铎
doaj
Gaoya dianqi, 2019 为能够有效监测氧化锌避雷器在线状态,及时发现故障,避免重大事故发生,对500 kV无间隙瓷外套氧化锌避雷器在不同受潮位置下各类电气参数的变化进行了试验,分析了全电流、阻性电流分量、阻性电流3次谐波、5次谐波、有功损耗、相位角对氧化锌避雷器受潮反应灵敏度的关系。试验结果表明:受潮位置不同,MOA各个电气参数的变化也不同;全电流、相位角对MOA受潮反应灵敏度不够,只能作为对MOA受潮进行判断的初步依据;阻性电流分量、阻性电流3次谐波相结合可作为判别MOA受潮位置的依据 ...
史志强 +7 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2015 以浙南洞头沿海海域的一次赤潮过程为例，对其爆发过程中气象因素影响特征进行了分析，重点分析了气象要素、天气形势对洞头沿海赤潮发生过程的影响.分析表明：气象因素对赤潮灾害的发生和消亡有较大影响，特别是气温、降水、风和气压等的影响作用十分明显，对赤潮的发生、发展起到重要作用.而此次过程中，风的要素对赤潮过程的影响最为突出.同时高空环流形势的转折变化，也直接影响这次赤潮过程的发生、发展.当环流形势稳定时，赤潮生物的海洋生存环境就稳定，赤潮得以持续；反之，当大气环流状态改变时，赤潮发生、发展过程也会受到影响.
FUshenghui(符生辉) +4 more
doaj +1 more source