Results 21 to 30 of about 598,873 (167)
Gaoya dianqi, 2021 利用特高频局部放电检测方法及时发现并处理气体绝缘金属封闭开关设备（GIS）内部固体绝缘缺陷,是GIS设备运维的重要手段。目前将异常特高频信号与现行标准、规范和典型模拟缺陷图谱进行比对从而诊断缺陷类型及严重程度的方法,因现场情况复杂、设备结构各异,准确性有待进一步提升。因此文中针对现场检测中发现的GIS固体绝缘表面放电缺陷和内部气隙放电缺陷,研究该类缺陷所激发特高频局部放电信号的PRPS统计图谱特征,并利用傅里叶变换和连续小波变换分析单次特高频原始脉冲的频谱特征和时频特征 ...
周电波 +6 more
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Infant Mental Health Journal: Infancy and Early Childhood, Volume 41, Issue 4, Page 463-476, July/August 2020., 2020 ABSTRACT A mother's propensity to refer to internal states during mother–child interactions is important for her child's developing social understanding. However, adolescent mothers are less likely to reference internal states when interacting with their children.
Amy L. Paine +5 more
wiley +1 more source
Gaoya dianqi, 2022 故障电弧严重威胁着光伏系统的安全稳定运行，研究其物理特性及保护装置具有重要的意义。文中为了探究光伏系统内直流故障电弧的时频域特性，构建更适合系统级仿真的电弧模型，以MATLAB软件作为仿真平台，分别研究了3种不同类型的电弧模型。通过对仿真所得的故障电弧电流信号进行时频分析，得到了不同电弧模型的时频特征，并与实验波形及其时频特征进行对比，得到了不同模型在故障电弧时频特性仿真方面的优缺点。单一使用电弧噪声模型和U-I模型无法完整地描述故障电弧特性，将二者适当组合得到的复合模型仿真效果良好 ...
孟羽 +4 more
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Institutional lessons from the Nordic management model
Conservation Biology, EarlyView.Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson +2 more
wiley +1 more source
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT The composition and structural characteristics of metacomposites are crucial for tuning their negative electromagnetic parameters; however, the lack of a clear structure–property relationship severely limits their application in dielectric and magnetic fields.
Chunyuan Deng +9 more
wiley +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Because magnetic permeability is an intrinsic property of materials, achieving the regulation of magnetic loss is one of the challenges for electromagnetic wave absorption materials. This paper focuses on the research idea of in situ growth of dispersed nanocrystalline FeSiB in an amorphous FeSiB matrix to regulate magnetic properties.
Lei Wang +4 more
wiley +1 more source
Dizhen xuebao, 2023 在实际中常遇到一类含有低速层的介质，其频散曲线在感兴趣的频率范围并无视觉上的交叉现象，也无明显的低速层指示。针对此类介质，基于地震反射资料中的面波信息，综合实例和数值模拟进行分析，结果显示：如果观测的基阶模式频散曲线不包含对低速层深度敏感的频段，单独基于基阶模式的频散曲线可能无法恢复模型的低速特征；但如果同时利用相同频段的多阶模式信息，即使观测的频散曲线没有明显的低速特征指示，也可以通过多模式频散信息反演重建模型的低速特征。
Xuanzheng Feng +3 more
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Infant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 6, Page 870-885, November 2025.Abstract Profiles of parental reflective functioning (PRF) may offer valuable insights into individual differences in PRF. Previous studies have identified PRF profiles; however, further validation is needed. This study aimed to investigate the convergent validity of the identified PRF profiles by examining their association with a related measure of ...
Eva Back Madsen +6 more
wiley +1 more source
Gaoya dianqi, 2023 高压断路器分合闸操作伴随的电流、振动信号特征与电气和机械状态息息相关。提出一种线圈电流和振动信号联合分析的断路器操动机构故障诊断方法，针对线圈电流“双峰状”特点，提取关键时序特征和刻画波形畸变的波形特征。为捕捉振动信号细节变化，对振动信号进行自适应噪声集合经验模态分解CEEMDAN后，进一步计算各分量的时频分布，得到时间、频率边缘特征。将电流和振动特征组成的高维特征由因子分析进行降维处理，作为支持向量机SVM的输入进行故障诊断。实验表明，该方法能够有效提升断路器典型故障诊断准确率，且时间开销较少 ...
包伟川 +4 more
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World Water Policy, Volume 11, Issue 3, Page 735-750, August 2025.ABSTRACT Ensuring the efficient operation of water supply facilities in the agro‐industrial sector is critical for sustainable resource management. The article streamlines the grouping of works performed during the operation of water supply facilities in six stages, differing in purpose, duration, and frequency of work.
Ekaterina Khmel +3 more
wiley +1 more source