Results 31 to 40 of about 9,709 (121)
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Considering the multiple challenges faced by stealth coatings in complex service environments, the development of multifunctional integrated microwave absorbing materials (MAMs) that combine efficient electromagnetic (EM) attenuation with environmental tolerance has become an urgent need. In this work, coral‐like CoNi@Void@C microparticle (MP)
Jiale Wu +8 more
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Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Exploring heat tolerance and acclimation capacity can provide an effective approach to evaluating species’ sensitivity to extremely high temperatures due to climate warming. Despite some work on amphibian and reptile thermophysiological adaptation, related questions remain. We reviewed the literature to provide a synthesis of worldwide data on
Zijian Sun +8 more
wiley +1 more source
Gaoya dianqi, 2000 本文描述了以小波变换为基础的滤波技术在高压冲击波形参数提取中的应用。新的数学工具———小波变换的引入使得波形处理更加简单。为检验其适用性 ,从消除白噪声和提取波形参数两方面进行了试验 ,并与Kalman滤波作了对比。结果表明 ,高压冲击试验中 ,小波变换的滤波效果较好 ,计算的波形参数也更准确。
王国利, 郝艳捧, 何义, 李彦明
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Although magnetic carbon materials possess significant potential in the field of electromagnetic wave absorption (EWA) due to the synergistic effect of multiple attenuation mechanisms, the currently reported magnetic carbon EWA materials face some challenges, such as high cost, low yield, and easy agglomeration of the magnetic component ...
Bo Jiang +9 more
wiley +1 more source
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The central challenge in the development of high‐performance electromagnetic wave‐absorbing materials lies in achieving an optimal balance between impedance matching and attenuation characteristics. This is particularly critical for purely dielectric absorbers, where precise tailoring of the real (ε′) and imaginary (ε″) parts of the complex ...
Zhixiao Wang +7 more
wiley +1 more source
四川大学学报. 自然科学版, 2008 采用光学小波变换可以大大节省图像数据压缩的时间,实现图像数据的实时压缩,为图像的快速传输奠定基础.在典型的光学4f系统的谱面上加滤波片是实现光学小波变换的常用方法,该滤波片可以用胶片、全息图和光栅作为滤波片.但是,因为光栅参数与小波谱值的数学关系复杂,推导的难度较大,所以以往人们都采用胶片或全息图作为滤波片,这样做的精度并不高.作者研究的是在4f系统的谱面上加光栅作为滤波片来实现小波变换,推导了光栅参数与小波谱值的数学关系,为人们制作4f系统的滤波片提供了另一种新的参考.
陈梨
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四川大学学报. 自然科学版, 1998 在自适应回声对消中应用多分辨率分析———对信号进行小波包子带分解后实行自适应对消，可以极大地降低计算复杂性．但若对信号进行的是正交分解（用Ｄａｕｂｅｃｈｉｅｓ小波），过程不具移不变性．为使过程具近似移不变性，作者由Ｄａｕｂｅｃｈｉｅｓ小波基（Ｄ２０）开始，通过修正尺度函数，再由双尺度方程得到小波基，使小波基近似移不变，同时还考虑了修正后滤波器的完美重构问题，并讨论了移不变性和完美重构之间的关系．
朱燕娜, 王永德
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Gaoya dianqi, 2020 针对线路双端数据不同步与线路参数不确定性所产生的误差以及单端法测距不准确的问题,文中提出了一种加窗小波包变换法,并结合双端测距原理将其应用于输电线路行波测距中。对行波信号进行加窗小波包变换,能够较为快速准确地定位到信号的奇异点,避免有波速不稳带来的误差,同时也能够提升波头识别精度,方便快速地实现对输电线路的故障测距。MATLAB工具对PSCAD搭建的故障模型仿真验证表明,采用加窗小波包变换的行波测距能够准确地提取行波信号的波头位置,具有较高的测距精度,与加窗小波相比,该算法具有精度较高的特点。
杨斌 +5 more
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Gaoya dianqi, 2005 提出了一种基于高斯线调频小波变换诊断电机故障的新方法。线调频小波变换是信号的时间-频率-尺度变换, 具有比小波变换及其它时频分析更强的非平稳信号分析功能。利用高斯线调频小波变换作电机故障信号的能量谱估计,可提取电机故障信号的频率成份。试验结果表明,这种方法比Fourier变换和小波变换频率分布的能量更集中。
胡国胜, 朱锋峰, 任震, 涂用军
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