Results 51 to 60 of about 23,510 (147)
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
Gaoya dianqi, 2010 采用有限元数值分析法,针对750 kV交流输电线路绝缘子片数及均压环配置,对绝缘子串电位分布进行了计算分析,比较了均压环均压深度、环径、管径及绝缘件介电常数对绝缘子电位分布的影响;对典型配置绝缘子"I"串进行了电位分布的测量研究,并将试验和计算的结果进行了对比分析。研究表明,均压环均压深度及环径对绝缘子电位分布影响较大,均压环管径及绝缘件介电常数对电位分布影响不明显;试验与计算的绝缘子最高分布电压百分比基本一致。
霍锋 +4 more
doaj
Geographic risks to functional groups of mammals and birds from habitat loss in Mexico
Conservation Biology, EarlyView.Abstract There is a need to quantify the impact of habitat loss due to anthropogenic factors on different aspects of biodiversity, such as functional trait diversity represented by functional groups (FGs). We developed a metric to assess the weighted risk of loss of habitat for 33 FGs of mammals and 36 FGs of birds in Mexico based on potential ...
Fernando Mayani‐Parás +4 more
wiley +1 more source
Dianci bileiqi, 2016 雷电的统计分布特性是雷电科学研究的重要基础。利用香港2005年至2014年雷电闪监测资料,进行了雷电的时域分布和雷电流的统计分布特性分析。研究表明:十年雷电总数的逾半数集中分布于极少数日子,深入挖掘相关数据可以为电力系统防雷提供新的可能。香港地闪雷电流幅值频率分布特征随闪电极性有显著差异,负闪雷电流幅值及出现频次均高于正闪。利用IEEE雷电流幅值概率分布公式计算了雷电流幅值的概率密度分布曲线方程,能较准确地反映香港雷电活动规律。
黄礼忠 +4 more
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Conservation Biology, EarlyView.Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis +7 more
wiley +1 more source
Gaoya dianqi, 2009 内部均压是高压硅堆研制的关键技术,而硅堆电压分布不均的现象在端部最为突出。以硅堆分布参数等效电路为基础,先采用解析方法分析硅堆内部电压分布规律和影响因素,针对硅堆端部电压分布尤其不均匀的特点,建立EMTP仿真模型,分析端部强制均压元件参数对硅堆电压分布不均匀系数的影响。提出采用非等值均压参数配置方法改善端部电压分布,并通过实验验证了这种非等值均压参数配置方法对改善高压硅堆电压分布不均匀度的效果。研究表明,这种端部均压方法能有效降低硅堆端部的分压,从而提高硅堆整体的反向耐压。
张磊 +4 more
doaj
Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source
Dianci bileiqi, 1989 论述了应用有限元法计算MOA电位分布和一种新型简便的具有一定精度的电位分布测量方法.两种结果取得了良好的一致性.通过计算和试验研究,分析了影响MOA电位分布的各种因素,并提出了电位分布优化设计方法.
毛慧明, 周佩白, 王国红
doaj
Production of top Quark pair at the large hadron collider(大型强子对撞机中顶夸克对的产生)
Zhejiang Daxue xuebao. Lixue ban, 2018 通过分析质心能量为8 TeV的质子-质子对撞实验，对大型强子对撞机上的ATLAS探测器，测量了顶夸克对产生过程pp→t的归一化微分散射截面，该实验数据对胶子部分子分布函数的确定非常重要.采用蒙特卡罗数值计算程序MadGraph以及CT10NNLO和CT14NNLO部分子分布函数，分别计算此过程的归一化微分散射截面，得到了与ATLAS实验相符的结果.进一步，用ATLAS实验数据和本文的理论计算结果，更新CT14NNLO部分子分布函数.结果显示，顶夸克对归一化微分散射截面对部分子分布函数不敏感 ...
ABLIKIMITursun(阿布力克木·吐尔孙) +1 more
doaj +1 more source
Harnessing social media data to track species range shifts
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury +15 more
wiley +1 more source