共查询到20条相似文献,搜索用时 125 毫秒
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一、组合演示实验按实验内容物理演示可分为单一性、组合性和综合性实验.大多数情况下,为了配合一个物理现象、概念或定律的讲解而演示一个实验,这就是单一性演示实验.对于某些内容,则可安排或设计一组实验,这些实验的题目和目的相同,内容相互补充,逐渐深化,对于建立正确的物理概念或图像、普遍性地验证物理定律、培养学生科学的思维方法,将收到比单一实验好得多的效果.我们把这一组实验称为组合演示实验.例如,验证角动量守恒定律有很多现成的仪器和实验,其中大家所熟知的离心节速器式角动量守恒演示仪只能演示不受外力矩作用… 相似文献
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本文简要介绍了绝热去磁降温的基本原理,并详细阐述了这一演示实验装置的设计思想和实验操作步骤.该实验装置结构简单,操作方便,便于在课堂演示绝热去磁效应.除此之外,它还可演示材料的顺磁和抗磁特性. 相似文献
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利用人体演示的物理现象曹胜荣(湖南邵东十中422800)利用人体发生的物理现象可演示的物理实验涉及到力学、热学、光学、电学等,教学时随时即可演示,既方便省时,又能激起同学们的兴趣,启发他们观察自己身边的物理现象.下面略举数例.一、可演示的力学实验1.... 相似文献
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多年来的教学实践表明,通过观看实验来学习物理是一条十分有效的学习途径.课堂演示实验是教师在课堂中演示给学生看的实验.课堂演示实验是物理教学的重要组成部分,然而在大学物理课堂中,给学生做演示实验的教师比较少.大学物理演示实验资源有待进一步充实和丰富. 相似文献
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用投影仪做物理演示实验毛容喜(珠海市红旗区一中519090)在物理教学中,经常做演示实验,但有时研究对象细少或动作微小,学生直接观察实物演示可见度小、效果差.这时,可运用投影器把细小的实物或微小的动作进行投影放大,以增强实验效果.例一演示双全属片受热... 相似文献
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在物理教学中,光学演示实验是比较难做的实验.原因是光源问题.一般的白炽灯光源,发光强度弱,方向性差,频率不单一.实验时需配用会聚透镜等,将白光变为实验时所需要的光.这种光源的实验装置较繁琐,需在暗室里进行,才能看到演示现象,给教学带来不便.激光器演示实验装置问世后,给光学演示实验带来根本性的变革.但激光器演示实验装置较笨重,需用220伏交流电源,搬到教室里来做,不方便.而且这种装置价格昂贵.多数学校,特别是农村中学无此实验装置.我们用儿童玩具“激光枪”作为光源,引进到光学演示实验教学中,收到令人… 相似文献
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自制电谐振实验演示器李伟(山东胜利油田第三高中237237)电谐振概念比较抽象,学生对现象难以理解,故设计了电谐振演示实验,效果明显.实验仪器实验步骤1.将示波器调整好,扫描范围为×10k,Y衰减为×10。2.将线路按原理留连接好.将可凋电容端接Y-... 相似文献
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表面张力的演示实验常用器材较小,不适宜课堂演示.我们设计的利用表面活性物质降低液体表面张力系数的作用,演示液体的表面张力时所用器材较大,适于课堂演示,甚至大阶梯教室的课上演示.将厚约1.2cm泡沫塑料板锯成长条形,其中两块长10cm,宽3.5cm,两块长12cm,宽2cm.将它们粘成T字形,如图所示,宽短一些的为底座.为了醒目可将竖立的泡沫塑料上色.实验时在脸盆内放满水(放满水不是实验的必要条件,只是为了能将T形塑泡体全部显露出来,便于观看).将两T形塑泡体平行放置在水面上,相距1cm左右.二者将水面分成了三个区域,… 相似文献
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《中国物理 B》2016,(12)
We report on an experiment on transferring an image through coherent population trapping(CPT) effect in a hot rubidium vapor. We demonstrate experimentally that an image can be transferred from a control light to a probe light.Moreover, we describe the demonstration that the image can be transferred from a control light to two different probes showing a feasibility of transferring an image onto multiple probes. We believe that this effect definitely has important applications in image metrology, high dimensional information transfer in quantum information field, etc. 相似文献
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"电感和电容对交变电流的影响"演示实验的操作难度大且现象不明显,为此介绍了2种演示该实验的方法,一是通过将电灯分别与电感(电容)和电阻串联对比进行实验来演示电感和电容对交变电流的影响;二是通过信号发生器和示波器来研究交流电对电感(电容)的影响.2种方法演示效果均较好. 相似文献
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We present a concept of graded photonic crystals used to enhance the control of light propagation. Gradual modifications of the lattice periodicity make it possible to bend the light at the micrometer scale. This effect is tailored by parametric studies of the isofrequency curves. As a demonstration, we propose a two-dimensional graded photonic crystal that could provide frequency-selective tunable bending. 相似文献
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We present the first observation of two-photon polarization interference structure in the second-order Glauber correlation function of two-photon light generated via type-II spontaneous parametric down-conversion. In order to obtain this result, two-photon light is transmitted through an optical fiber and the coincidence distribution is analyzed by means of the start-stop method. Beyond the experimental demonstration of an interesting effect in quantum optics, these results also have considerable relevance for quantum communications. 相似文献
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We report on the experimental demonstration of the light dragging effect due to atomic motion in a rubidium vapor cell. We find that the minimum group velocity is achieved for light redshifted from the center of the atomic resonance and that the value of this shift increases with decreasing group velocity, in agreement with the theoretical predictions by Kocharovskaya, Rostovtsev, and Scully [Phys. Rev. Lett. 86, 628 (2001)]. 相似文献
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We report on the experimental demonstration of the broadband “trapped rainbow” in the visible range using arrays of adiabatically
tapered optical nanowaveguides. Being a distinct case of the slow light phenomenon, the trapped rainbow effect could be applied
to optical signal processing, sensing in such applications as spectroscopy on a chip, and to providing enhanced light-matter
interactions. As an example of the latter applications, we have fabricated a large area array of tapered nanowaveguides, which
exhibit broadband “trapped rainbow” effect. Considerable fluorescence enhancement due to slow light behavior in the array
has been observed. 相似文献