共查询到20条相似文献,搜索用时 78 毫秒
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在电磁学实验中,用小磁针演示磁感线没有"连续的"效果.笔者采用一种巧妙的办法,使磁感线的演示直观生动,现介绍如下. 相似文献
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交流跳圈演示实验是电磁学教学中常做的演示实验,传统的交流跳圈演示实验对楞次定律和法拉第电磁感应定律能给出很好的演示说明.我们对交流跳圈演示实验做了如图1所示的改进,原线圈(1600匝)套在L形的铁轭上;漆包线绕制成的动圈与外电路连接,并用细棉线悬挂起来.通过动圈的受力情况,能进一步演示说明交流电的三种电路特性.文献[1]对此仅作定性分析,在此我们再给予定量分析. 相似文献
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电磁感应一直是中学物理乃至大学电磁学课程的教学重点,并配置有演示实验和学生分组实验以帮助学生加深理解其实验现象和定律。传统的演示方法是用条形磁铁以不同速度插入和拔出线圈,通过电流计指针的偏转情况来说明感生电流的大小和方向与哪些因素有关。这种演示方法存在以下几个问题: 1.电流计的显示视野小。只有演示台附近的部分学生可以看清。 2.演示电表机械性能差。由于惯性、阻尼等 相似文献
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《中国科学:物理学 力学 天文学(英文版)》2015,(12)
In this review article, a brief introduction on the theory, experiments and applications of metamaterials is presented. The main focuses are concentrated on the composing meta-atoms, the method of transformation optics, the experimental demonstration of negative refraction, and the realizations of invisibility cloaks and electromagnetic black hole. At the end of this review, some typical applications of metamaterials, including high-performance antennas made of zero-refractive-index materials, inhomogeneous metamaterial lenses, and planar metasurfaces, are introduced in details. 相似文献
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H. E. Puthoff 《International Journal of Theoretical Physics》2007,46(12):3005-3008
In 1953 Casimir proposed a semiclassical model for the electron based on the concept that net inward radiation pressure from
the electromagnetic vacuum fluctuation fields (as in the Casimir effect, generally) might play the role of Poincare stresses,
compensating outward coulomb pressure to yield a stable configuration at small dimensions. Given that in scattering experiments
the electron appears point-like, critical to the success of the proposed model is demonstration that the self-energy corresponding
to the divergent coulomb field does not contribute to the electron mass. Here we develop a self-consistent, vacuum-fluctuation-based
model that satisfies this requirement and thereby resolves the issue of what would otherwise appear to be an incompatibility
between a point-like electron and finite mass. 相似文献
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We present an experimental demonstration of self-guiding electromagnetic edge states existing along the zigzag edge of a honeycomb magnetic photonic crystal. These edge states are shown to possess unidirectional propagation characteristics that are robust against various types of defects and obstacles. In particular, they allow for the unidirectional transport of electromagnetic energy without requiring an ancillary cladding layer. 相似文献
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陈述了现行《斯特林制冷机通用规范》中存在的一些问题,并对解决规范中工作环境、电磁兼容及可靠性考核等问题提出了建议。 相似文献
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线性负电阻构成的新型LC振荡演示器 总被引:1,自引:0,他引:1
提出了利用负电阻电路作线性临界补偿构成的LC振荡电路形式,该电路用于电磁振荡演示具有起振容易,输出波形标准,演示直观等优点。 相似文献