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Table of Content
20 May 2016 Volume 35 Issue 5
General treatment of inhomogeneous boundary conditions for equations of wave motion or heat conduction in higher dimensions
LIN Qiong gui
College Physics. 2016, 35(5): 1-4.
Abstract
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1207
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(449KB) (
2190
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For any well-posed problem of the equation of wave motion or heat conduction with inhomogeneous boundary conditions in higher ( two or three) dimensions， an auxiliary problem is proposed. Using the solution of the latter， the original problem is transformed to one with homogeneous boundary conditions. This method for solving problems with inhomogeneous boundary conditions is widely applicable and easy to follow. Solutions for two examples are presented.
A dynamical analysis of global aerodyne
MIAO Ying kai
College Physics. 2016, 35(5): 5-7.
Abstract
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1728
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(257KB) (
575
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This paper analyzes the mechanics of global aerodyne that does circular motion on the horizontal rail. Using forces and moments balance of the motorcycle in the movement， the stress situation， the maximum speed and the body inclination of the motorcycle doing circular motion in the horizontal rail are analyzed. The maximum height of the rail is calculated.
A concise approach to derivation of operator matrix element of
WAN Zhilong， LI Hengmei， HUANG Hongyun， WANG Zhen
College Physics. 2016, 35(5): 8-10.
Abstract
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862
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(272KB) (
473
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By introducing the Hermite polynomial operator， we derive its normally ordered expansion and inversion equation. The general formula of 〈 m | X k | n〉and 〈 m | P k | n〉for harmonic oscillator are deduced and the result is also discussed.
Applications of Faraday effect in spintronics
MA Hong，ZHAO Lina，LIU Mei，JIAO Yang，LENG Jiancai
College Physics. 2016, 35(5): 11-13.
Abstract
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1261
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(357KB) (
1284
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Rotation effect is one of the important contents of college physics. Faraday rotation spectroscopy based on Faraday effect is proofed to be an effective method to investigate spin polarization and spin relaxation in materials.In this article，we study the theory of Faraday rotation and ellipticity which is caused by effective magnetic field induced by ultrafast circular polarization laser pulse by using Jones matrix.
Study on equivalent complex impedance between two terminal nodes in the RC ladder network
FANG Jinghuai，LI Hongbing，TAN Zhizhong
College Physics. 2016, 35(5): 14-18.
Abstract
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1401
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(415KB) (
892
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The complex impedance network is different from the pure resistance network，and the change of the circuit element has a great influence on the equivalent complex impedance. In this paper，the equivalent complex impedance formula of the two terminal RC complex impedance network is studied by using the method of establishing the model of nonlinear difference equation. According to the different conditions of the potential，the universal formula of the equivalent complex impedance of RC ladder network under different conditions is studied by using the complex analysis method，and the equivalent capacitance formula of pure capacitance network is obtained naturally.
Analysis on using stable plate method to measure the thermal conductivity of liquid
AN Yanwei，XIE Liang
College Physics. 2016, 35(5): 19-23.
Abstract
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1597
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PDF
(546KB) (
1103
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The thermal conductivity of liquid at different temperatures has been measured by using the stableplate method.Six methods such as linear fitting，progressive difference and so on，are used in the calculation of cooling rate. Meanwhile，the corresponding thermal conductivity coefficients have been calculated. The final thermal conductivity calculation results show that the result given by linear fitting among the six different ways is the best.
The experimental device for measuring the thickness of the optical elements based on the Michelson interferometer
ZHOU Jinxin,WANG Yunxin，ZHANG Xin
College Physics. 2016, 35(5): 24-26.
Abstract
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931
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(677KB) (
641
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An experimental apparatus is described，which can be used to measure the depth of optical elements based on the Michelson interferometer. Firstly，the basic theory of a Michelson interferometer is analyzed. Secondly，a Michelson interferometer optical setup is built to measure the depth of the glass slide，it used CCD and computerto capture and observe interference fringes，and MATLAB software is applied for image processing. Finally，the factors affecting the measurement accuracy is given. Experimental results show that it can be more accurate and convenient which use the Michelson interferometer to measure element thickness with the help of MATLAB software.
Application of Feedback in simulation system of experimental physics teaching
WANG Yafang，JIANG Yun，ZHOU Weigong，DONG Aiguo，ZHANG Zili，ZHENG Zhiyuan
College Physics. 2016, 35(5): 37-40.
Abstract
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789
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(487KB) (
563
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Simulation technique has been widely used in the teaching center of experimental physics，China University of Geosciences，Beijing for almost 20 years. In order to figure out how the students think about this technique and how much it has positive effect on their learning，we have handed out the questionnaires to the students who have gone through the whole line of the simulation system. The result shows that the students are not really used to the system although they are aware and agree that the simulation system is good for them. In the last part of the paper，the useful suggestions are proposed.
An application method of introducing the history of physics into the college physics teaching
NING Chang chun，CHEN Xi，SUO Lang Sang Mu， WANG Ya ping，DAN Zeng Luo Bu
College Physics. 2016, 35(5): 41-45.
Abstract
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825
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(655KB) (
1069
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How to select，organize the physics history materials，and seep it into the college physics teaching are introduced.
Relationship between the Doppler effects and the position of observer to sound source
HUANG Shuangyin，GUO Zhenping
College Physics. 2016, 35(5): 46-48.
Abstract
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1263
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PDF
(359KB) (
503
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In the space-time diagram，use the space-time lines to describe the movement of the static sound phase and the observer，and the intersection of two lines means the observer receives the sound signal. Combining mathematical graph，we analysis to deduce that formulas of the Doppler effects，those are not only associated with the speed of the observer to the sound source，but also related to the position of the observer to the sound source
Analytical solutions of Madelung constant of double atomic chain on circles
CHEN Bei，LUO Qiang，HAN Jiu rong
College Physics. 2016, 35(5): 50-52.
Abstract
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1141
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(227KB) (
442
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We give the analytical solutions of all the remaining expressions (the original equations (4)，(11) and (15))and correct the identity of the digamma function (the original equation (8))，and propose a new definition of the Madelung constant in the situation of dimerization in a recent paper titled 《Madelung constant of double atomic chain on circles in college physics》.
A new exploration in determination of mechanical equivalent of heat by electrothermal method
CAI Chen，LI Chaorong，LI Yingzi，WANG Xuan
College Physics. 2016, 35(5): 53-56.
Abstract
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1476
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PDF
(455KB) (
906
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A new experimental method is proposed to resolve the heat dissipation problem of the device in determination of mechanical equivalent of heat by electrothermal method. Based on integral method，the result of mechanical equivalent of heat is more close to the theoretical value，and the data exhibits strong linear relationship through simple linear regression.
The thought of compiling 《University Physics Demonstration Experiment》
LU Rongde，CHENG Fuzhen
College Physics. 2016, 35(5): 57-60.
Abstract
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1262
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(178KB) (
1032
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The argument in this paper is how to strengthen students’independent innovation consciousness in the textbook of 《University Physics Demonstration Experiment》. Supporting my position is that the innovative thinking is mixed point by point through to the practice teaching of demonstration experiment of university physics by the introduction of the compiling of the textbook of 《University Physics Demonstration Experiment》. Such a conclusion would be that the cultivation of independent innovation ability not only have innovative ideas，but also be effectively implemented in the practical activities of the university physics demonstration experiment
The research on James Franck and his relation with Max Born
HOU Yude，ZHU Panpan
College Physics. 2016, 35(5): 61-65.
Abstract
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857
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PDF
(395KB) (
564
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James Franck was an outstanding experimental physicist in 20th century，Max Born was a first-class theoretical physicist in 20th century. They were lifelong good friends. In 1920s，they built the Gttingen physical school，and made it being the center of physics in the world. Reliving their friendship，reliving their excellent partnership，there would be a kind and good impression and feeling rising from inner.Whether to be good people or to do things well，Max Born and James Franck were the noble examples for us forever.
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