Results 21 to 30 of about 25,659 (142)
Shuitu Baochi Xuebao, 2021 干旱荒漠地区地下水补给是地表植被水分消耗的主要补给源，地下水埋深与植被指数（NDVI）关系密切。针对植被指数与地下水埋深响应关系研究的不足，分析了基于河套灌区解放闸灌域植被指数（NDVI）与地下水埋深（H）的定量关系。采用2016年3—9月的10个时相的landsat8遥感影像数据与同时期的57眼地下水埋深观测数据，经NDVI遥感提取与地下水埋深（H）的地统计分析，建立NDVI与H的时空相关关系，并做显著性检验与密切程度的划分，进一步分析不同地下水埋深分区下H与NDVI的关系。结果表明 ...
郑倩 +6 more
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Dizhen xuebao, 2018 在我国大陆广泛搜集到的45个地震序列的基础上，首先利用最大似然估计法计算出不同样本量地震序列的变异系数值，然后与其对应的断层源参数作相关性分析，并对具有不同样本量地震序列中的变异系数值进行标准化处理，进而计算得到一个通用的变异系数值（αc=0.37）。相关分析结果显示变异系数值与断层的长度和滑移速率呈负相关，在此基础上本文对通用变异系数值（αc=0.37）的应用进行了分析，通过对αc进行一倍标准差运算得到3个变异系数值（0.21，0.37，0.53），分别适用于特征性具有明显差异的活动断层.
Chun Hui +4 more
doaj +1 more source
Automating the analysis of public saliency and attitudes toward biodiversity from digital media
Conservation Biology, EarlyView.Abstract Measuring public attitudes toward wildlife provides crucial insights into human relationships with nature and helps monitor progress toward Global Biodiversity Framework targets. Yet, conducting such assessments at a global scale presents challenges.
Noah Giebink +8 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 通过野外径流小区放水试验，研究2种台田类型（土坎，石坎）、3种台田级数（1，2，3级）、1种坡度（10°）、3种放水流量（0.5，1，1.5 m3/h）下坡面流土壤侵蚀过程，分析台田措施下坡面流土壤侵蚀水动力学特征。结果表明，台田级数对坡面流流态影响较大，增加台田级数可使坡面流波动性降低，台田类型对雷诺数影响相对较小。土壤分离速率总体随流量增大而增大，相同流量条件下，呈波动性增加后减少且逐渐趋于平稳的特征，两者相关关系用指数函数回归方程拟合（R2>0.840）。同类台田且田面宽度和相同条件下 ...
肖丛宇 +6 more
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Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
The application of Benford's law to groud lightning data(Benford定理在地闪数据中的应用)
Zhejiang Daxue xuebao. Lixue ban, 2014 自然界数据库中的首位非零1~9数字并不等概率出现，其出现概率符合对数分布，即Benford定理.概述了 Benford定理及其适用范围，在研究浙江省闪电定位系统的2007~2012年监测数据时，发现正闪和负闪的每日地闪频次的首位数字占比情况非常符合Benford定理（相关系数分别为0. 995 6和0. 997 9）.正闪雷电流幅值的首位数字占比情况与Benford定理相当吻合（相关系数为0.997 9），但负闪雷电流幅值的首位数字占比却与定理的相关性较差（相关系数为0.
FENGZhiwei(冯志伟) +4 more
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Scenarios and strategies for future‐proofing ecosystem management under climatic novelty
Conservation Biology, EarlyView.Abstract Climate change is driving unprecedented declines in dominant, habitat‐forming foundation species across marine and terrestrial ecosystems globally. As climatic novelty becomes the norm, ecosystem reassembly will become increasingly common. Predicting and understanding these transitions, and their implications for future ecosystem functioning ...
Lauren T. Toth +14 more
wiley +1 more source
Gaoya dianqi, 2021 介绍了高压直流输电系统中2次谐波的传递过程,以及由此可能引发的谐波不稳定性。针对变压器绕组中存在的直流电流而导致的2次谐波电流进行了仿真分析研究,得出了励磁电流中2次谐波幅值与直流电流的关系。2次谐波幅值与直流电流的关系由线性系数X体现,从换流变压器阀侧看入交流系统侧的阻抗与变压器变比N以及线性系数X相关,相关系数为（1/N-3/2X）,线性系数X与变压器的额定励磁电流Im呈负相关。结果表明 ...
刘洪涛 +7 more
doaj
Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
wiley +1 more source