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Dielectric properties of SiC/Ni nanocomposites prepared by a simple and facile electroless plating approach at X band are investigated. Compared to the original SiC nanopartieles (SiCp), the real part of the permittivity, ε', and the dielectric loss tangent tang δe of SiC/Ni nanocomposites are clearly enhanced by about 31% and 33%, respectively. The effective equations for complex permittivity of SiC/Ni nanoeomposites are proposed. We also calculate ε' and tan δe of SiC/Ni nanoeomposites and the calculated results are well consistent with the measured data. 相似文献
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We simulate the spectrum characteristics of fibre Bragg grating (FBG) with non-uniform temperature using the transmission matrix method, and the results are analysed. It is found that firstly the modulated coefficient of average refractive index is a very important parameter that influences the spectrum characteristic of the fibre Bragg grating, and secondly the spectrum curves are different in different temperature fields at the same parameter. Hence, we can determine the metrical temperature by analysing the spectrum of fibre Bragg grating. 相似文献
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针对如何利用较少学时,使学生获取更多信息,如何改革教学方法,在传授知识的同时培养学生的能力这一问题,提出了在普通物理教学中对学生进行五种能力培养的教学目标,并阐述了为实现这一目标所采取的措施。 相似文献
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Dielectric Response and Broadband Microwave Absorption Properties of Three-Layer Graded ZnO Nanowhisker/Polyester Composites 总被引:2,自引:0,他引:2 下载免费PDF全文
We design and prepare three-layer graded ZnO nanowhisker/polyester composites. The dispersion configuration of ZnO nanowhiskers in the polyester is investigated, and their microwave reflectivity curves are also measured. Experimental results have shown that the graded dispersion with ZnO nanowhiskers contributes to broadband microwave absorption. In other words, the absorption band depends on the graded dispersion configuration of ZnO nanowhiskers in polyester matrix. 相似文献
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为了处理运动目标跟踪中的遮挡、光照变化以及背景杂乱等问题,提出了一种基于加权多实例学习的压缩感知目标跟踪方法。在提取图像块类Haar特征的基础上,采用随机投影方法对高维特征进行压缩,结合加权多实例学习策略,在boosting学习框架下训练分类器,根据分类器最大响应值得到跟踪目标图像块。使用矩形框手动标定第一帧图像的目标,对后续帧采样的正负实例的类哈尔特征进行压缩,通过这些样本特征训练分类器,得到跟踪结果。实验结果表明,所提算法具有较高的跟踪精度、实时性和鲁棒性,对所选的四个具有挑战性的视频序列,跟踪成功率都能超过89%,帧率也超过26f/s。 相似文献