Results 31 to 40 of about 8,919 (161)
An assessment of future rewilding potential in the United Kingdom
Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Restoring ecosystems is an imperative for addressing biodiversity loss and climate change, and achieving the targets of the Kunming–Montreal Global Biodiversity Framework. One form of restoration, rewilding, may have particular promise but may also be precluded by requirements for other forms of land use now or in the future.
C. Brown, R. Prestele, M. Rounsevell
wiley +1 more source
Shuitu Baochi Xuebao, 2018 探明径流小区尺度下不同水土流失治理模式的径流泥沙效应，对于大尺度水土流失治理具有重要意义。通过野外标准径流小区自然降雨试验探究了湘北红壤低山丘陵地带3种典型水土流失治理模式（S1模式：坡改梯+经果林，S2模式：等高沟垄+农作物，S3模式：平整撂荒坡面+草本）径流泥沙效应。结果表明：3种治理模式在次降雨诱导下平均径流量为S3（1.84 m3）>S1（1.03 m3）>S2（0.78 m3），平均泥沙流失量为S3（1.191 t/hm2）>S1（0.411 t/hm2）>S2（0.311 t/hm2 ...
宋江平 +5 more
doaj
Research on properties of PAD [PDF]
, 2016 随着LED亮度的不断提升和制程的不断优化，相同光效下芯片的尺寸越缩越小，芯片制造成本也不断降低，市场占有率不断扩大。因此，对于芯片可靠性的研究及不断改善逐渐成为了LED应用所面临的难点之一，尤其缺乏芯片长期老化失效的分析以及对芯片严苛使用环境下的失效模式的分析。 本论文通过GaN基LEDs芯片端金属电极（PAD）性能的研究，分析并改善了芯片端长期老化以及在严苛工作环境下的老化可靠性。同时，在此基础上设计了新的PAD降成本结构，降低了PAD端贵金属的耗量。本文的主要结论如下： （1）对于R-PAD结构 ...
王锋
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Experimental study on dynamic response and residual compressive strength of composite sandwich panel with PVC foam core under single-point low-velocity impact [PDF]
ObjectivesIn this paper, an orthogonal braided glass fiber composite sandwich panel with a PVC foam core and dimensions of 150 mm×100 mm×26 mm is selected as the research object in order to study the impact mechanical properties of composite sandwich ...
Chongyi CHEN +6 more
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Dutch landscapes have lost insect‐pollinated plants over the past 87 years
Journal of Applied Ecology, Volume 61, Issue 6, Page 1323-1333, June 2024.This study implies that Dutch landscapes are losing insect‐pollinated plant species, which is likely due, at least in part, to the decline in pollination services. Our results of quantifying the decline in insect‐pollinated plants support the necessity and urgency of taking conservation initiatives.
Kaixuan Pan +3 more
wiley +1 more source
The importance of equity in payments to encourage coexistence with large mammals
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Large mammals often impose significant costs such as livestock depredation or crop foraging on rural communities, and this can lead to the retaliatory killing of threatened wildlife populations. One conservation approach—payments to encourage coexistence (PEC)—aims to reduce these costs through financial mechanisms, such as compensation ...
Joseph Hamm +2 more
wiley +1 more source
Shuitu Baochi Xuebao, 2006 对元谋干热河谷区4种旱坡地生态农业模式的水土保持效益进行了系统的研究。结果表明：与对照模式“罗望子＋裸地”相比，建立的4种模式均体现了良好的水土保持效果，其中．“罗望子＋木豆＋柱花草”模式截持降雨。增加地表盖度．改善土壤物理性状，提高蓄水保水能力，防治水土流失效果最佳，其余3种模式均有明显的生态效益。根据需要．若重新对套入模式的主栽灌草层作物进行科学合理的搭配，重建后的优化复合生态农业模式，无论是生态效益，还是经济和社会效益都将得到充分的体现。
杨艳鲜 +6 more
doaj +2 more sources
A standard approach for including climate change responses in IUCN Red List assessments
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract The International Union for Conservation of Nature (IUCN) Red List is a central tool for extinction risk monitoring and influences global biodiversity policy and action. But, to be effective, it is crucial that it consistently accounts for each driver of extinction.
Giordano Mancini +7 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan建立Levy型索穹顶结构有限元分析模型，给出有限元结果合理性的判定准则，提出冲击失效准则。进行大量冲击工况下的动力响应全过程分析，给出杆件破坏分布规律和失效模式，揭示在竖向冲击荷载作用下的失效机理。依据冲击失效机理及参数分析，提出抗冲击措施。研究结果表明：所有冲击工况均符合冲击判定准则，在所选竖向冲击荷载范围内，Levy型索穹顶结构的失效模式分为4种，即结构轻度损伤、结构局部1级失效、结构局部2级失效和结构整体破坏。随着冲击动的增加，结构的动力响应模式逐渐呈模式1→模式2→模式3→模式4发展趋势 ...
高占远, 朱佳静, 薛素铎, 阮冬
doaj +2 more sources
The Research of ESD Protection in CMOS IC [PDF]
, 2012 随着集成电路的工艺制程的发展，器件的特征尺寸日趋缩小，同时器件的结构愈加的复杂。这使得ESD(ElectroStaticDischarge)事件对芯片的威胁随之增大。因此集成电路中的ESD防护的设计的重要性也日益突显。采用TCAD工具能够方便的对ESD防护器件研究，相比于传统的方法，使用TCAD仿真具有时间和成本上的优势。 本文先对CMOS集成电路中常用的ESD防护器件进行了介绍。这些器件包括电阻，二极管，MOS管，可控硅（SCR）等。对这些器件的基本结构，以及ESD事件下的工作机制作了详细的分析 ...
黄勤业
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