Results 11 to 20 of about 2,698 (172)
Policy &Internet, Volume 15, Issue 2, Page 223-242, June 2023., 2023 Abstract Drawing on an online survey of mayors from the German federal state of Baden‐Wuerttemberg this article analyses (1) to what extent social media is used abusively at the municipal level, (2) how mayors react to hate speech and (3) whether the experience of such insulting comments and threats is correlated with their perception of social media ...
Rafael Bauschke, Sebastian Jäckle
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Lightweight and lead‐free radiation shielding materials remain urgently needed. This work designed a fluorite high‐entropy oxide (FHEO) system through a combined computational–experimental route. Density functional theory based on special quasi‐random structures was used to identify thermodynamically stable fluorites from a wide compositional ...
Xiangjie Duan +9 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT With the rapid growth demand for advanced integrated electronic systems, lightweight flexible electromagnetic interference (EMI) shielding films integrated with functional properties, such as excellent mechanical properties and self‐healing capability, are a research focus in high‐tech functional materials. Herein, a sandwich‐structured aramid
Dan Guo +9 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The development of efficient and stable bifunctional electrocatalysts is a key challenge for the industrialization of hydrogen production by water electrolysis. In this work, Co‐doped NiS/Ni3S2 heterostructured nanowire arrays (Co–NiS/Ni3S2 NA) were successfully constructed by precisely modulating the phase‐selective behavior of nickel ...
Xing‐Hang Liu +2 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Emerging as attractive alternatives for sustainable, low‐cost, and high‐performance electromagnetic interference (EMI) shielding, biomass‐derived carbon is nonetheless constrained by a limited repertoire of shielding mechanisms. Herein, a straightforward method was employed to synthesize self‐supporting Co nanoparticles embedded in porous N ...
Yingjie Xu +6 more
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Assembly of Oriented Cellulose Nanocrystal Thin Films and Their Applications in Controllable Fabrication of Composites [PDF]
, 2016 纤维素纳米晶体（CNC）是一种新兴的一维纳米材料，由于具有密度低、长径比可调、高弹性模量和高强度、生物相容性好以及丰富的组装行为等优点在先进功能材料、光电子器件、医疗设备等重要领域应用前景广阔。其性能与组装行为，尤其是宏观尺度上的组装结构密切相关。CNC的单轴取向组装体可实现基于溶液法的功能化薄膜材料的低成本制备。然而，迄今为止，很少研究者能够提供可靠的方案获得宏观尺度有序的密堆积CNC组装体，从而限制了CNC基的组装体在众多功能材料和器件中的广泛应用。因此 ...
杨丹琴
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
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Dianci bileiqi, 2017 针对雷电波通过传输线在不同孔缝屏蔽腔内对电子设备造成损坏等问题,通过对孔缝屏蔽腔体屏蔽效能的理论分析,并采用（impulse current generated system,ICGS）雷电冲击平台模拟8/20μs波形的雷电流,对不同孔径的屏蔽腔体进行试验分析。试验表明:金属屏蔽腔体对1.75 GHz雷电电磁信号的屏蔽效能与2.5 GHz的雷电电磁波相比,其屏蔽效果更好;当屏蔽腔体表面的孔缝直径为30 mm时,腔体对雷电电磁波的屏蔽效果最好,范围为16.5 dB18 dB ...
李月英, 苏丽敏, 周文
doaj
MXene‐Based Electromagnetic Attenuation Materials in Microwave and Terahertz Bands
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT MXenes exhibit considerable potential for developing high‐performance electromagnetic (EM) shielding and absorption materials operating across microwave and terahertz frequencies, due to their tunable surface chemistry and exceptional charge carrier transport properties.
Guozheng Zhang +9 more
wiley +1 more source
Gaoya dianqi, 2010 随着中国特高压电网的建设,对于特高压变电站内电磁环境的评估已经引起了相关部门的重视。为了保障工作人员的健康与安全,国内变电站工作人员在工作期间都穿有屏蔽服,减弱这种危害。为了评估高压变电站现有屏蔽措施的效能,根据国家的相关规范与标准,对500 kV变电站的电磁环境和目前的屏蔽措施进行了测试,分析了目前屏蔽措施的屏蔽效果,结果表明,目前变电站内的屏蔽服对工频电场的屏蔽效果较好,在测试模型的头部和胸部的屏蔽效能分别为39.4 dB和12 dB,但是对工频磁场的屏蔽效能较差,在相同的位置的屏蔽效能分别为0 ...
杨帆, 姚德贵, 彭卉, 何为
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