自感现象演示实验的改进

自感现象演示实验的改进周晓红（南京建筑工程学院２１００１５）一般教科书中自感现象的演示线路图中Ａ、Ｂ处（如图１）是用规格相同的灯泡连接的．本文对原有的演示实验进行一些改进，将Ａ、Ｂ处的灯泡换下，接入两只规格相同适当的电流表，使学生直观地观察到电感线圈...     

利用多媒体计算机演示拍现象

将传统的"拍"现象演示装置与现代的计算机多媒体教学技术结合,用麦克风采集拍音信号,并通过音箱放大,同时将采集到的信号输入到计算机中,利用频谱分析软件进行实时分析,并将拍信号投影在大屏幕上,使学生全面、直观地认识、掌握拍的概念.     

浅议自感现象实验的演示

图1所示为一自感现象的演示实验电路．怎样才能把这个实验演示成功，且对实验所出现灯泡更亮的一闪再熄灭的现象给予正确的解释呢？笔者根据平时在教学过程中的实践和思考提出了一些不成熟的看法，与各位同仁商讨．     

两个演示实验的改进

本介绍了可同时演示共振和驻波现象的共振驻波演示装置，并在原有激光单缝衍射演示实验的基础上设计了可随意调节缝宽的单缝衍射演示装置     

光纤位移传感演示实验

光纤位移传感演示实验刘丽敏，苑立波（哈尔滨船舶工程学院物理部１５０００１）一、光纤传感技术简介光纤传感技术是伴随着光导纤维及光通信技术的发展而逐步形成的．在光通信系统中，光纤从作远距离传输光波信号的媒质，但是，在实际光传输过程中，光纤易受外界环境因素...     

自感现象演示实验研究

传统的自感现象演示实验,不能揭示自感的实质．为此,笔者经过多年的教学实践,对自感现象演示实验进行了研究,并总结了实验方法和实验过程,在此与教育界同仁共商．     

LED在自感现象演示实验中的应用

利用发光二极管对自感现象演示实验进行了改进,明显地提高了实验效果,加深了对自感现象的认识。     

基于Lab view声卡音频演示拍现象

介绍了利用Lab view演示声波拍现象方法,设计基于声卡的Lab view双通道信号发生器产生两个频率接近的音频信号,分左右声道驱动两个喇叭,相当于两个振源,即形成拍音,并利用信号发生器测量拍频。     

光的折射、全反射演示装置的制作

用三合板等简易材料制作了演示光的折射和全反射现象的装置,并介绍了该装置的使用方法.     

“拍“现象演示实验仪

根据"拍"现象原理,针对大学物理课堂演示的特点,制作成一种"拍"现象演示实验仪,本文介绍了它的制作原理和调试方法以及和其它仪器的配套使用方法.     

光干涉现象的演示

采用传统方法演示孔(双孔、三孔)和缝(双缝、三缝)的干涉图像,与由传感器采集图像信息后由计算机得出干涉光强分布曲线进行比较,两种方法获得的实验图像符合较好.     

简易电磁驱动演示器

利用易拉罐和塑料瓶等日常器具制作了简易电磁驱动演示器。     

液体表面现象的演示设计

介绍了有关液体表面层、单液膜和双面膜球形气泡内外压强差的比较以及毛细现象中液面高度随半径变化规律的演示设计和实验方法.     

Gravity's rainbow

The temperature anisotropy of the cosmic microwave background may be partially the imprint left by gravitational waves. Measuring the gravitational wave component and spectral shape of the anisotropy is a critical test of inflationary cosmology and theories of large-scale structure formation.This essay received the first award from the Gravity Research Foundation, 1993-Ed.     

投影彩虹全息术

本文提出一种新的彩虹全息图的记录方法——投影彩虹全息术.这种技术简化了彩虹全息图的记录过程,在某些方面克服了传统方法的限制,制作的投影彩虹全息图具有大景深、大视角和高分辨率的特点.文中介绍了投影彩虹全息图的记录和再现的原理,分析了它的基本性能,并讨论了一些成功和可能的应用.     

周视彩虹全息术

本文一改以往平板彩虹全息图垂直于全息图面观察的形式,给出一种几乎平行于全息图面观察的周视彩虹全息图的制作技术,这种全息图观察范围为360°最后给出了实验结果,并作了讨论.     

Computer-generated true-color rainbow holograms

A new method of calculating computer-generated true-color rainbow holograms (CGTCRH) is proposed. This technique allows the true-color object reconstruction. The main idea of the presented work is based on the additive properties of holographic wavefront reconstruction such that the resulting hologram is a superposition of three (or more) holograms, with each of them producing different color reconstruction of the same object. White light and monochromatic light reconstruction results are discussed.     

Surface plasmon rainbow jets

A new method for optically exciting and visualizing surface plasmons in thin metal films is described. The technique relies on the use of a high-numerical-aperture objective lens to locally launch a broad wavelength spectrum of surface waves and to detect the leaky radiative modes associated with them. We used this approach to obtain a direct visualization of the plasmon intensity distributions, e.g., rainbow jets, and to quantify their propagation lengths throughout the visible spectrum.     

The electrojet phenomenon

The term ‘electrojet’ is frequently used to describe the intense bands of electric curent which flow at certain times in the earth's ionosphere at an altitude of about 100 km. Two main forms of electrojet current are distinguished; an equatorial electrojet which flows during the daylight hours in a narrow band of latitudes centred on the magnetic equator, and an auroral electrojet which flows during the main phese of magnetic storms in auroral regions. Both are accompanied by abnormally large changes in the geomagnetic field components as measured at the earth's surface. This article reviews the main features of the two forms of electrojet and discusses the present theories for their origin. Ionospheric irregularities are associated with both types of electrojet, and the experimental evidence so far accumulated indicates that these are produced by plane plasma waves generated by a two-stream instability in the plasma and travelling with the acoustic velocity of about 360 m s^?1.     

声悬浮现象的研究

分析了声波在垂直谐振腔内使物体悬浮于空中的条件与位置,给出了运用声悬浮现象测量声速的方法并实测了声速.