Results 31 to 40 of about 12,289 (167)
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem +4 more
wiley +1 more source
Gaoya dianqi, 2001 利用X -射线投影技术对输配电设备进行外部诊断是一项新的技术。本文研究了高精确性投影技术 ,包括应用X -射线CT的三维图象处理技术以及利用X -射线和红外线更精确地检测内部情况的方法。
钟菊
doaj
Multi-wavelength Emissions for Sgr A* and Low-Luminosity Active Galactic Nuclei [PDF]
, 2015 黑洞吸积一直是高能天体物理的一个重要过程。本文主要讨论了Sagittarius~A$^\star$(\sgra)的宁静态和耀发态，以及低光度活动星系核系统的多波段辐射，寄希望于对\sgra\的吸积和抛射过程，以及低光度活动星系核的中心引擎有一个统一深入的理解。本文可以主要分为以下四个部分： 在第二章，我们利用现有的法拉第旋转量（RM）观测讨论了\sgra\的喷流模型。在过去二十多年里，已经有多个理论模型被用来解释\sgra\的宁静态辐射。辐射低效吸积流和喷流模型是其中的两个竞争模型。利用对\sgra ...
李亚平
core
Evolution of research on global amphibian declines
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract In the late 1980s, the scientific community became aware of severe, enigmatic amphibian population declines. These declines triggered a wave of research focused on quantifying their extent and identifying key drivers. We used text‐analysis techniques, including topic modeling and geoparsing, to examine the evolution of research focused on ...
Jordann Crawford‐Ash +6 more
wiley +1 more source
He jishu上海硬X射线自由电子激光装置（Shanghai HIgh-repetition-rate XFEL aNd Extreme Light Facility，SHINE）具有高亮度、全相干性和高重复频率等特点。对于高重频硬X射线进行聚焦时，复合折射透镜（Compound Refractive Lens，CRL）需要承受高热负载，甚至会出现由高热应力引起的光学器件性能失效问题。为了确保CRL聚焦镜的热应力在许可限定范围内和CRL聚焦镜在高重频X射线下保持良好的光学性能，采用有限元方法（Finite ...
王 震, 佟 亚军, 刘 芳
doaj +1 more source
Preparation of Metal-organic Frameworks and Its Application in Lithium-ion Batteries [PDF]
, 2015 近年来，随着新能源汽车市场的快速发展和人们对更长续航能力锂离子电池的需求，开发新一代高功率密度和高能量密度的锂离子电池材料成为当前研究领域的一个热点。金属有机框架材料（MOFs）是一类由金属离子与有机配体通过可逆的配位键形成的具有高度有序网络结构的2D或3D材料，因其独特的框架结构在储能领域有着潜在的应用前景。 本文围绕金属有机框架材料M3(HCOO)6及其复合材料在锂离子电池中的应用开展研究，主要内容如下： 1、采用液相扩散法合成了M3(HCOO)6（M=Co，Ni，Mn）材料 ...
林雄贵
core
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Articular cartilage regeneration remains a significant challenge because of its limited intrinsic healing capacity and the inadequacy of conventional treatments for restoring structural and functional integrity. In this study, a novel injectable composite hydrogel scaffold was designed to mimic the extracellular matrix (ECM) of native ...
Zhong‐Lian Wu +13 more
wiley +1 more source
Gaoya dianqi, 2019 SF6气体绝缘全封闭组合电器（GIS）内部可能出现金属微粒等异物缺陷导致故障,因此对GIS设备内部的异物缺陷故障进行检测具有重要的意义。X射线成像法是一种检测GIS设备内部缺陷的有效方法,但缺乏成熟的参数选择方法。文中对X射线检测的基本理论进行了介绍,对GIS设备X射线检测参数选择方法进行了讨论,并为220kV GIS设备内异物缺陷检测选择了合适的参数。在选定参数下,使用双丝像质计对射线成像系统的不清晰度进行了研究,验证了X射线对金属微粒缺陷检测的可行性 ...
周艺环 +5 more
doaj
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Nanozymes have attracted considerable attention in cancer therapy due to their adjustable enzyme activity and high catalytic efficiency. However, they still face a major challenge from tumor metastasis. In this work, endogenous/exogenous dual‐responsive bimetallic hollow PdRu (termed HPdRu) nanozymes were prepared.
Nan‐Nan Zheng, Xin Hu, Jun‐Qing Hu
wiley +1 more source
Synthesis and Characterization of New Transition Metal phosphate halides [PDF]
, 2016 随着含氟磷酸铁锂在二次锂离子电池正极材料中的应用，含氟聚阴离子型化合物受到了人们的关注，但是在合成化学上多个阴离子基团的引入存在一定的难度，使得含氟或卤素磷酸盐化合物的数目并不多，结构化学亟待丰富。同时多阴离子基团与过渡金属元素之间的协同作用规律性也有待进一步探索。因此本文旨在以含氟、含氯和含氟氯的过渡金属磷酸盐为研究对象，利用氯化物盐类自带的结晶水而尽可能少加水或不加水的水热法，探索合成新晶体，进一步丰富该类化合物的结构化学，探讨氟和氯在晶体结构中的作用，并研究其热稳定性或磁性等方面的性质 ...
裴大婷
core