Results 11 to 20 of about 496 (106)
Rare Metals, EarlyView.ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi +5 more
wiley +1 more source
Novel Non‐Equimolar High‐Entropy Zirconates With Superior Thermophysical Properties
Rare Metals, EarlyView.ABSTRACT Rare‐earth zirconates (RE2Zr2O7) are promising candidates for topcoat materials in thermal barrier coatings (TBCs). However, their practical application in TBCs is limited by poor fracture toughness and low thermal expansion coefficient (TEC).
Taoyi Lu +7 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT This study introduces novel nonequiatomic TiZrCoCrMoCux (x = 0, 5, 10; at%) medium‐entropy alloys (MEAx) tailored for orthopedic implants, synergistically combining the biocompatibility of Ti‐based alloys, the wear resistance of CoCrMo alloys, and the antibacterial/osteogenic attributes of Cu. The alloy's microstructure, mechanical properties,
Hang Yu +9 more
wiley +1 more source
Rare Metals, EarlyView.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
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT High‐entropy alloys (HEAs) have emerged as a transformative class of materials distinguished by their complex chemical compositions, unique microstructures, and remarkable mechanical and functional properties. Traditionally, the discovery and optimization of HEAs have relied on conventional methods, including trial‐and‐error experimentation ...
Chrispin Ouko Zamzu +2 more
wiley +1 more source
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The B2 phase is a critical strengthening constituent in AlxFeCoCrNi high‐entropy alloys (HEAs), and introducing such phases onto the nanoscale cellular substructures is an ideal pathway for strengthening alloys fabricated by laser powder bed fusion (L‐PBF).
Xiangjian Zhu +5 more
wiley +1 more source
Gaoya dianqi, 2016 由于传统电能质量评估方法无法体现"分布式"特征,难以评估分布式光伏电能质量。为了解决这一问题,首先对主观赋权法和客观赋权法进行综合比较,提出采用熵权法进行赋权。然后引入改进AHP和指标极化处理,对熵权法进行改进。建立涵盖输入、过程和输出3方面的指标体系,采用改进熵权法进行评估。实例表明,改进熵权法能较为充分地利用实测的小样本数据,能较好地体现"分布式"特征,可以为分布式光伏电能质量评估提供参考。
马春艳, 刘惠康, 龚瑛
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Shuitu Baochi Xuebao, 2020 为了解不同林龄柳杉人工林枯落物的水源涵养能力，为森林水土保持措施的确定和实施提供依据，于2018年10月选取平坝区大坡林场5个龄组柳杉人工林作为研究对象，采用烘干法和实验室浸水法对枯落物的持水性能进行研究，并采用熵权法对柳杉人工林5个龄组枯落物水源涵养能力进行综合评价。结果表明：（1）随着柳杉人工林的生长发育，枯落物储量及持水特性呈现先增加后减小的趋势，表现出成熟林最大，幼龄林最小。其中成熟林枯落物厚度为7.40 cm，蓄积量为2.21 t/hm2，最大持水量为6.46 t/hm2，最大持水率为265 ...
杨家慧, 谭伟, 卯光宪, 冯艳
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Gaoya dianqi, 2019 弹簧势能的可靠储存是保障断路器后续分合闸操作正确的前提。通过分析控制回路、电机、传动部件和弹簧之间的能量转换和传递关系,提出一种电—振信号熵权特征联合的断路器储能机构故障类型辨识方法。首先利用希尔伯特变换（Hilbert transform）提取储能电机电流信号包络时域特征并计算峭度;然后由局部均值分解（LMD）处理断路器储能过程伴随的振动信号得到乘积函数分量（PF）,并提取PF能量谱频域的盒维数特征;进而采用熵权法对电流和振动信号待分类样本进行剪辑,按照样本信息量和重要性赋予对应的权重 ...
赵书涛 +5 more
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Shiyou jixie, 2014 针对石油井架损伤位置识别问题，提出了基于ITD与排列熵的损伤位置特征提取方法。利用ITD方法将锤击响应振动信号分解为一系列PR分量，PR分量更能突出损伤位置信息，计算PR分量的样本熵值，形成的特征向量可分性良好。依据相关性系数选择代表损伤状态主要信息的PR分量，计算其排列熵形成有效的特征向量。以支持向量机为特征向量模式识别器，对比了ITD与近似熵方法所提取特征向量，对于相同有限数量的样本，ITD与样本熵特征向量明显高于ITD与信息熵特征向量的识别率，验证了ITD样本熵方法的有效性 ...
邹龙庆 +3 more
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