Results 21 to 30 of about 804 (162)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Additively manufactured AlCoFeNi series eutectic high‐entropy alloys (EHEAs) exhibit nonequilibrium dual‐phase microstructure in the as‐printed state, allowing them to be easily tailored through annealing to explore their strength–toughness potential.
Huidong Wu +13 more
wiley +1 more source
Gaoya dianqi, 2023 针对电磁斥力机构真空快速开关的机械状态监测问题，提出了一种最大奇异值能量熵（energy entropy of maximum singular value,EEMSE）和随机森林的故障诊断方法。首先，在真空快速开关中采集振动信号，对振动信号进行改进S变换得到模矩阵，随后对该矩阵的子矩阵进行奇异值分解，再利用信息熵理论对最大奇异值求熵得到特征向量，最后将特征向量输入随机森林模型进行故障分类和诊断。与不同特征量和分类器比较后的结果表明，文中提出的真空快速开关机械故障诊断方法特征一致性好，模型诊断速度较快 ...
张宇 +6 more
doaj
Detection method of wind speed anomaly fluctuation based on SSA−LSTM [PDF]
Aiming at the problem of high leakage rate and false alarm rate of traditional statistical methods for abnormal fluctuation in sensor monitoring data caused by dampers opening and closing, a SSA-LSTM wind speed abnormal fluctuation detection method based
Jian LIU +3 more
core +1 more source
Integrative Conservation, Volume 5, Issue 1, Page 59-73, March 2026.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
wiley +1 more source
, 2013 经济学是一门在传统上讨论稀缺问题的学科。稀缺资源的配置（自然资源和劳动力）涉及到广泛的哲学问题——有关价值、偏好、效率以及权益的问题。近年来物理科学和生态科学的发展，导致了可持续性的看法，并随之带来了一个以往不被主流经济学家重点关注的新问题。Daly（1992a）把宏观经济规模这个问题，或者说较之环境经济的规模该有多大这个问题说成是“灿烂的反常现象”。因为，尽管单一的经济活动最优规模可以按照其净利润是最大的观点来确定，但对于最优宏观经济规模却没有一致同意的度量 ...
George F. McMahon +3 more
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The growing concern over human health issues, driven by increasingly severe electromagnetic pollution from 5G communication, has made the urgent development of high‐performance electromagnetic wave (EMW) absorbing materials. Although carbide‐based materials are promising because of their conductive and polarization losses, existing single ...
Chenqiang Duan +9 more
wiley +1 more source
The Microstructure Evolution and Mechanical Properties of (FeCoCrNi)100‐x(AlCu)x High‐Entropy Alloys
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT This study systematically investigates the effects of AlCu addition on the microstructural evolution and mechanical properties of (FeCoCrNi)100‐x(AlCu)x (x = 0, 5, 10, 15, 20; at%) high‐entropy alloys (HEAs). The results reveal that the microstructure evolves from coarse equiaxed to refined equiaxed, dendritic, and ultimately dual‐phase ...
Shunfu Xie +7 more
wiley +1 more source
基于用最小二乘法改进的EMD与能量熵融合的断路器机械故障诊断方法
Gaoya dianqi, 2014 笔者针对经验模态分解（EMD）分解结果的准确性对实验结果的影响,利用最小二乘法对EMD进行改进,有效地缓解了EMD固有的端点效应对实验结果的影响。分别对断路器操动机构的正常振动信号和连接臂松动信号进行EMD和小波变换分解,并将能量熵分别应用到改进EMD与小波变换中。通过能量熵值计算分析表明,改进的EMD能量熵值明显大于小波能量熵,因此改进的EMD与能量熵融合法为断路器机械状态识别提供了有益的帮助。
许丹, 于龙, 王玉梅
doaj
Crowed Abnormal Detection Based on GLCM and Optical Flow [PDF]
, 2014 在视频监控系统中,针对人群打架暴乱等异常行为检测的问题,提出一种基于图像的纹理特征和光流特征的人群异动事件检测算法,利用灰度共生矩阵进行纹理特征的提取来计算人群密度,然后利用光流法表征运动方向信息,用熵表示运动的混乱程度。实验结果表明,本文提出的算法能较好地解决人群异常事件检测的问题。Aiming at the problem of detecting the crowed abnormal event in the video surveillance system,this paper ...
林沁, 章历
core
Phased array radar individual recognition based on phase-frequency fusion feature [PDF]
To solve the problem of phased-array radar individual identification in the complex electromagnetic environment with wide spectrum, heterogeneous waveforms and strong energy, an unintentional modulation feature extraction method based on phase and ...
HONG Tao +4 more
core +1 more source