Results 51 to 60 of about 35,375 (133)
Gaoya dianqi, 2021 为了及时有效地诊断变压器绕组松动故障,针对变压器空载合闸振动信号,提出了一种基于变分模态分解(VMD)的分析方法。首先运用VMD对绕组松动前后变压器表面合闸振动信号进行最优模态分解,建立信息熵—峭度—相关系数综合评价模型,并运用熵权—TOPSIS法提取特征模态分量;通过计算变压器振动信号能量熵进一步判定绕组状态;最后搭建测试平台进行实验验证。结果表明,绕组松动和正常状态下变压器振动信号在特征频率和能量分布上均存在明显差异,该方法为变压器绕组松动故障诊断提供了新的思路。
张九思 +4 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Developing rapid, precise gas sensors for Listeria monocytogenes (LM) biomarker detection faces challenges due to suboptimal gas‐solid interactions. Herein, we report the rational synthesis of amino‐functionalized mesoporous SiO2 hollow nano‐doughnuts (MS‐2‐NH2‐2) via modification with (3‐aminopropyl) trimethoxysilane (AAPTMS), which enables ...
Xingyu Wang +7 more
wiley +1 more source
Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan +6 more
wiley +1 more source
四川大学学报. 自然科学版, 2004 引入了一类新的带ψ 强单调映象的广义非线性拟变分包含.在Hilbert空间中使用极大η 单调映象的预解算子方法建立了这类变分包含解的存在性定理,构造了求此类变分包含解具误差的新迭代算法,并讨论了算法的收敛准则.
金茂明
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Photocatalytic hydrogen peroxide (H2O2) production from water and oxygen driven by solar energy represents a highly promising green and sustainable strategy. Herein, lignin‐derived carbon quantum dots (LCDs) were strategically introduced at the heterojunction between a Bi‐based metal organic framework (Bi‐MOF) and ZnIn2S4 (ZIS).
Wanpeng Sun +8 more
wiley +1 more source
Gaoya dianqi, 2011 在设计阶段准确计算并改善串级试验变压器的各级电压分布,对于合理地设计串级试验变压器具有十分重要的意义。笔者针对一台2250kV绝缘筒式串级试验变压器,根据变压器的绕组结构和外部尺寸利用有限元分析软件分别计算出变压器的内部和外部的电容参数,并将变压器外部电容采用等电位分配的方法归算为变压器级间电容。运用分配负载电容的方法建立变压器电压分布计算的等值电路,采用ATP-EMTP进行仿真计算,获得变压器的稳态电压分布。在变压器不满足电压分布要求的情况下 ...
顾朝敏 +4 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Magnetic particles coated with carbon shells have been considered as promising electromagnetic wave absorption materials with antibacterial features. However, how to precisely control the monodispersed magnetic nanoparticles on a carbon matrix to manipulate impedance matching and antibacterial performances is still a key challenge.
Xiaofei Li +10 more
wiley +1 more source
World Affairs, Volume 189, Issue 4, Winter 2026.ABSTRACT The move from unipolarity to a fluid and contested multipolar world order has significantly changed the way African nations form national security policy due to changes in the nature of the strategic environment of those states. Much of the literature has focused on how the actions of major world powers ‐ the United States, China and Russia ...
Chick Edmond +2 more
wiley +1 more source
Dianci bileiqi, 2020 为解决500 kV瓷绝缘子串红外图像分割问题,提出了一种基于分水岭算法的图像分割方法。通过调整红外图像G分量消除云雾干扰,图像预处理后采用灰度拉伸法进行图像增强;然后利用Otsu算法将灰度图像二值化,通过Hough变换确定绝缘子串基准线,并据此使用Floodfill算法提取绝缘子串目标区域;角度校正后做欧式距离变换,以局部最小值为标记符避免过分割,再采用分水岭算法进行绝缘子片分割。据此对湖南省某座500 kV变电站700张红外图像进行分析,结果表明,本文所提方法具有良好的自适应性和实用性 ...
刘正庭 +6 more
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Psychometric framework for coexistence with large carnivores
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Human–carnivore coexistence is essential for biodiversity conservation, yet measuring the attitudes and behaviors that support it remains methodologically challenging. We developed psychometric scales to assess willingness to coexist with carnivores and the underlying beliefs of this coexistence through an iterative expert elicitation process ...
Benjamin Ghasemi +14 more
wiley +1 more source