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综述了近几十年, 特别是近十几年来铁磁材料的力磁耦合变形与断裂行为的研究概况.
传统铁磁弹性问题的研究已经有较长时间的积累, 文献中已有大量的研究结果发表. 近些年
来, 随着智能材料及结构应用与研究的兴起, 功能铁磁材料如稀土超磁致伸缩材料、铁磁相
变材料以及铁磁复合材料等的力学行为越来越受到重视, 人们在功能铁磁材料的变形与断裂
以及铁磁复合材料的有效性质等方面开展了大量的研究工作. 本文在简单介绍了经典铁磁弹
性和传统铁磁结构的力磁性能的研究背景基础上, 结合作者近年来在铁磁材料变形与断裂方
面所开展的工作, 着重评述了功能软铁磁材料在变形与断裂的实验研究,如实验设备和技术,
以及铁磁复合材料细观力学、软铁磁材料、铁磁功能材料的变形与断裂理论等方面的研究进
展, 并指出了需要进一步研究的方向. 相似文献
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The microwave photonic filters (MPFs) based on serially coupled silicon microring resonators (MRRs) are theoretically analyzed for the application of 60-GHz millimeter wave wireless personal area networks. This is achieved by calculating the improvement of bit error ratio (BER). According to the simulation results, the requirement of signal-to-noise ratio (SNR) of the received data can be reduced by 14 dB for the same BER with and without MPFs. The performance of the MPF with five serially coupled microring structures is better than that of the MPF with a single microring, owing to the improvement of the shape factor. 相似文献
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Compact temperature-insensitive modulator based on a silicon microring assistant Mach-Zehnder interferometer 下载免费PDF全文
<正>On the silicon-on-insulator platform,an ultra compact temperature-insensitive modulator based on a cascaded microring assistant Mach-Zehnder interferometer is proposed and demonstrated with numerical simulation.According to the calculated results,the tolerated variation of ambient temperature can be as high as 134℃while the footprint of such a silicon modulator is only 340μm~2. 相似文献
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给出一类具有四个状态可修复系统算子预解式特性,对任意给定的δ>0,r=a+bi,固定a1,a2,使得-μ+δ相似文献
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针对长跨距密集波分复用系统中喇曼放大入纤泵浦功率过大的问题,将遥泵放大器(RP-EDFA)引入到系统中,通过对共纤RP-EDFA的噪音性能及其优化设计的研究,在理论上计算比较了RP-EDFA系统和后向喇曼放大系统在不同泵浦功率水平下的光信噪比和非线性相移,表明遥泵放大技术有效降低了入纤泵浦的功率水平,更适合长跨距应用.运用遥泵放大技术,对一个典型的长跨距系统进行系统Q值的模拟,结果表明:在 220 mW泵浦功率水平下可以实现跨距为 167 km的40×11.6 Gbit/s系统1000 km传输,Q值裕量4.4 dB. 相似文献
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Correlated photon pairs at 1.5 μm are generated in a silicon wire waveguide (SWW) with a length of only 1.6 mm. Experimental results show that the single-side count rates on both sides increase quadratically with pump light, indicating that photons are generated from the spontaneous four-wave mixing (SFWM) processes. The quantum correlation property of the generated photons is demonstrated by the ratio between coincident and accidental coincident count rates. The highest ratio measured at room temperature is to be about 19, showing that generated photon pairs have strong quantum correlation property and low noise. What is more, the wavelength correlation property of the coincident count is also measured to demonstrate the correlated photon pair generation. The experimental results demonstrate that SWWs have great potential in on-chip integrated low-noise correlated photon pair sources at 1.5 μm. 相似文献
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