Results 31 to 40 of about 232,098 (142)
Shuitu Baochi Xuebao, 2017 为明确东北黑土区农田土壤风蚀的主要影响因素，通过室内模拟试验，对比分析了黑土在不同风速（5～14 m/s）、土壤含水量（2%～11%）以及秸秆覆盖率（0～80%）下的风蚀速率差异，进而分析了风蚀速率与各因素之间的数量关系。结果表明，黑土起沙风速略大于5 m/s，其风蚀速率随风速增大呈指数增加，风速14 m/s（含水量2%）时的风蚀速率比8 m/s时增加了11.6～42.7倍。黑土风蚀速率随土壤含水量升高呈先增加后降低趋势；在土壤含水量小于5%时随含水量升高而逐渐增加，至含水量5%时达到峰值并逐渐降低 ...
林, 李和平, 肖
doaj
World Water Policy, Volume 12, Issue 3, August 2026.ABSTRACT Groundwater depletion is a major challenge in semiarid, hard‐rock regions where irrigation demands often exceed natural recharge. This study evaluates the effectiveness of farm‐scale recharge pits as a local, supplementary, and community‐managed groundwater recharge solution in the Dharta catchment of Rajasthan, India. Alongside check dams and
Prahlad Soni +4 more
wiley +1 more source
Conservation Biology, Volume 40, Issue 4, August 2026.Abstract Bycatch in fisheries is one of the most serious threats to pelagic seabirds, causing major population declines. Mitigation measures can reduce bycatch substantially, but many fisheries fail to apply best practices, and seabird mortality remains high.
V. Warwick‐Evans +2 more
wiley +1 more source
, 2000 由于高速列车车厢高度密闭的特性，高速列车的通风设计必须满足旅客的安全性和舒适性。而传统的依赖自由射流的经验公式确定车厢内温度场和速度场的方法因无法考虑送排风气流和室内障碍物的影响，通风设计很大程度上依赖于模型实验。该研究将送排风气流与车厢型状及座椅作为一体来考虑、通过数值模拟车厢内温度场和速度场来保证满足舒适空调要求的同时，还可方便地确定出送风速度和送风温差。该方法不仅适用于高速列车的通风设计 ...
庄达民 +3 more
core +2 more sources
Review of Policy Research, Volume 43, Issue 4, July 2026.ABSTRACT The accelerated digitalisation of society has amplified cybersecurity threats and revealed their cross‐sectoral nature. Yet, the policy instruments used to address these challenges remain insufficiently examined. This study conducts a scoping review of 980 academic articles (2007–2024) and applies Hood's NATO framework (Nodality, Authority ...
Benedetta Cotta, Maria Stella Righettini
wiley +1 more source
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT AI‐generated images have become so good in recent years that individuals often cannot distinguish them from ‘real’ images. This development, combined with the rapid spread of AI‐generated content online, creates a series of societal risks. Watermarking, a technique that involves embedding information within the content to indicate their AI ...
Bram Rijsbosch +2 more
wiley +1 more source
Interventions to Reduce Child Poverty and Its Determinants: A Rapid Overview of Reviews
Poverty &Public Policy, Volume 18, Issue 2, June 2026.ABSTRACT Despite evidence for various child poverty reduction strategies, there is ambiguity regarding the most effective types to inform policy. Thus, we conducted an overview of reviews to systematically identify, appraise, and synthesize interventions for reducing childhood poverty in high‐income country settings.
Omar Dewidar +9 more
wiley +1 more source
Gaoya dianqi, 2010 风力发电对发电系统可靠性具有一定贡献,正确地估算包含风电场的发电系统可靠性有助于更好地规划电源结构。传统的单一风速模型忽略了风速与负荷之间的相关性,会给计算结果带来较大的误差。本文提出了风速的分时段估计模型,即按照风速的时间特性分别估计各个时段风速模型的参数,给出了基于此模型的包含风电场的发电系统可靠性计算的一般方法,并分析了单一风速模型与分时段风速模型之间计算结果差异产生的原因,以及风速与负荷之间的相关性对可靠性计算结果的影响。最后通过一个具体的算例说明了分析的正确性。
华文, 徐政
doaj
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The urgent environmental crisis caused by polyethylene terephthalate (PET) waste necessitates efficient upcycling strategies. Herein, we establish a novel pathway to transform waste PET plastic into a high‐performance catalytic material for mediating the oxygen evolution reaction (OER). Through a one‐step hydrothermal process, waste PET serves
Xin Wang +5 more
wiley +1 more source
, 1994 简述了二维超音速激波风洞的设计要点和性能;并给出在该风洞中低凸台诱导激波和湍流边界层相互作用的实验结果。实践表明：在被驱动段和喷管之间安装一个前缘光滑的矩形剖面短管道；并将二维喷管精加工成型 ...
王宇 +4 more
core +2 more sources