Results 41 to 50 of about 34,085 (172)
, 1986 本文对发光管的出纤功率、发光管与纤维的接续损耗及光纤之间的接续损耗进行了估算与实际测试,其结果表明两者相当接近,并由此绘出光路上各部分光功率损失分布 ...
孙振兴
core +1 more source
Gaoya dianqi, 2018 为了研究电流畸变情况下油浸式配电变压器负载损耗和绕组热点温度的变化规律,基于IEEE StdC57.110中的绕组涡流谐波损耗因子和杂散谐波损耗因子,并考虑绕组在谐波电流下的集肤效应会增强,定义了绕组电阻谐波损耗因子,从而建立了变压器在谐波电流下负载损耗计算模型。考虑到绕组涡流损耗密度分布不均对绕组热点温度的影响,利用文中所建立的变压器在谐波电流下负载损耗计算模型修正了IEEE Std C57.110:2008的绕组热点温度计算公式。分析结果表明,谐波电流会引起较大的额外负载损耗,谐波畸变率为40 ...
周卫华 +7 more
doaj
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The inherent trade‐off between high saturation induction (Bs) and low core loss in soft magnetic materials presents a challenge in the development of high‐frequency power electronics. Here, a processing approach that combines accelerated Cu ordering with dual magnetic anisotropy control in high‐Bs Fe‐based nanostructured cores is examined ...
Xiaoying Li +11 more
wiley +1 more source
, 1981 本文阐述了光通信用石英系玻璃纤维产生损耗的原因、目前研究的现状,以及作为长波长光导纤维材料的局限性;叙述了长波长极低损耗光导材料的选择原则,分析了影响光导材料损耗的因素,从而指出某些元素的卤化物系列作为长波长光导材料的优越性;叙述了卤化铊系列化合物的性质、制备方法、热分析数据和纤维化性能的试验 ...
袁启华, 王建何, 张克立
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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
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
wiley +1 more source
, 1980 <正> 光纤传输特性中最重要的是传输带宽和传输损耗。带宽主要受多模色散、材料色散和结构色散的限制。传输损耗主要由光纤材料的固有吸收、杂质吸收 ...
溯源
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Fe‐based amorphous alloys are attractive soft magnetic materials for next‐generation power electronics, yet simultaneously achieving high saturation magnetic flux density (Bs), low coercivity (Hc), and low core loss under scalable processing conditions remains challenging.
Zhi‐Jun Guo +10 more
wiley +1 more source