Results 21 to 30 of about 931,934 (165)
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The similar physicochemical properties of alkali metal elements make the co‐enrichment and precise separation of Cs+ and Rb+ in complex brine systems highly challenging. Here, an all‐inorganic strategy is proposed, which achieves efficient enrichment and precise separation of Cs+ and Rb+ in high‐salt systems by constructing Sr2+/Ba2+‐based ...
Kang Li, Ruixin Ma, Shina Li
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四川大学学报. 自然科学版, 2015 本文提出一种多尺度特征匹配的空间约束机制,Combinative Feature based on Constraint in scale space(CFCS-SIFT),该约束机制以SIFT特征点的尺度为基础,对多尺度空间中检测到的DOG特征点与Harris角点提供匹配空间约束,以提高正确匹配点对的数量.基于该约束机制,构造了一种融合DOG特征提取、Harris角点提取原理的SIFT描述符提取与匹配方法,该方法在多尺度空间中提取DOG特征点、Harris角点,并根据特征点的空间 ...
林强, 李征, 吴仲光
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The Role of Uncertainty in the Policy Process: An Extension to the Multiple Streams Framework
Review of Policy Research, Volume 43, Issue 1, January 2026.ABSTRACT A core assumption of the Multiple Streams Framework proposes that agenda and policy change is more probable when a policy proposal worked out as a viable alternative in the policy stream is coupled with the political and/or problem stream in an open policy window.
Sebastian Hemesath, Georg Wenzelburger
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Gaoya dianqi, 2017 为了提取泄漏电流安全区内体现绝缘子污秽度的特征信息,在反复试验的基础上,测取了4种污秽度下XP-70型绝缘子串的泄漏电流,采用了自适应阈值法对原始信号进行消噪,提取出安全区内的3个特征量:有效值均值、有效值最大值和有效值标准差,分析得出这3个特征量与绝缘子表面等值附盐密度呈指数拟合关系。选择了400组泄漏电流有效值特征量作为训练与识别样本,建立了基于概率神经网络的绝缘子污秽度预测模型。仿真和试验结果对比表明,模型预测准确率达87.5%。研究结果不仅对线路绝缘子清扫决策有一定的指导作用 ...
汪万平, 陈伟根, 刘凡, 苏明虹
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Functional Ecology, Volume 39, Issue 10, Page 2889-2904, October 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract In the Southwest Australian Biodiversity Hotspot, the greatest plant species diversity tends to occur on the most phosphorus (P)‐impoverished soils. Many plant species in this P‐impoverished environment release root carboxylates that mobilise soil P which is a more ...
Xue Meng Zhou +5 more
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Integrative Conservation, Volume 4, Issue 3, Page 416-429, September 2025.Staghorn ferns are among the most highly valued ornamental plants but several species experience major extinction threats. Here we establish a DNA barcoding reference dataset to support reliable identification of cultivated staghorn ferns to secure species identity of individuals at all life stages that are used in ex situ and in situ conservation of ...
Kaikai Wang +6 more
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Shuitu Baochi Xuebao, 2016 选取黄土丘陵区岔巴沟流域不同位置和不同沟道级别的30条典型切沟为研究对象，基于三维激光扫描技术（LIDAR），建立了基于高分辨率DEM提取切沟形态特征的方法，对比分析了0.1 m与5 m 2种分辨率DEM提取切沟形态特征参数的差异，实现对低分辨率DEM提取的切沟形态特征参数向高分辨率尺度转化。结果表明：基于三维激光扫描技术获取的0.1 m高分辨率DEM提取到的切沟形态特征值与手工测量的切沟形态特征值之间无显著差异，三维激光扫描技术提取切沟长度、宽度、深度、表面积和体积分别是手工测量的94.0%，109 ...
吴红艳, 徐锡蒙
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大数据为提高图像清晰度，解决传统图像在去雾过程中存在的特征提取困难、去雾不彻底等问题，提出一种基于生成对抗网络的多特征融合端到端去雾网络。该网络由生成器和判别器组成，生成器采用编解码结构，通过多特征提取融合（MFEF）块提取多种感受野下的高维表征信息。判别器使用一系列卷积计算对生成图像和清晰图像进行特征差异分析，引导生成器输出更加真实的去雾图像。实验结果表明，该算法在有效消除雾霾干扰的同时，能够最大限度地保留图像的原始色调。与现有方法相比，该算法在峰值信噪比、结构相似性客观评价指标上分别提升了2.588 dB、
司亚中, 张旭龙, 杨帆, 王健宗, 程宁, 肖京
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China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Antipode, Volume 57, Issue 3, Page 830-861, May 2025.Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
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Risk, Hazards &Crisis in Public Policy, Volume 15, Issue 2, Page 203-235, June 2024.Abstract Misinformation presents a challenge to democracies, particularly in times of crisis. One way in which misinformation is spread is through voice messages sent via messenger groups, which enable members to share information on a larger scale. Gaining user perspectives on digital misinformation interventions as countermeasure after detection is ...
Katrin Hartwig +2 more
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