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Table of Content
20 April 2012 Volume 31 Issue 4
著者文摘
Weyl correspondence of classical functions and quantum operators
. 2012, 31(4): 1-1.
Abstract
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862
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(484KB) (
708
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A new idea how to solve the integration containing incommutable operators is proposed, the problem of the correspondence between classical functions and quantum operators is studied, the explicit formulae of Weyl correspondence is obtained. Furthermore, a new method of examining the completeness relation of a quantum representation is given.
The position-momentum uncertainty relation of electron diffraction
. 2012, 31(4): 6-6.
Abstract
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911
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(278KB) (
318
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By solving the Schrodinger equation and using Fourier transform, the two-dimensional electron wave function is derived, and some issues concerning with the position-momentum uncertainty relation are discussed.
Application of Hamiltonian canonical equation in the membrane-colloidal particle interaction
. 2012, 31(4): 9-9.
Abstract
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767
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550
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The application of Hamihonian canonical equation in the membrane-colloidal particle interaction is introduced. After the Hamihonian of the system is given based on the Helfrich model, a set of first-order differential equations are obtained with the Hamihonian canonical equation, which can be solved by the shooting method. The study reveals the variation of the stable structure for different membrane parameters.
Surface modes at the interface of two isotropic mediums
. 2012, 31(4): 12-12.
Abstract
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722
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(275KB) (
375
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Surface modes at the interface of two isotropic mediums are investigated and the law of Brewster is analyzed in another aspect.When the incident lights match the surface modes at the interface,the energy of incident lights will transfer to the eigen states at the interface.If the electromagnetic fields in the refractive medium have propagating modes,the surface modes will generate new propagating electromagnetic waves in the refractive medium,forming transmission waves with all the energy of incident lights.This phenomenon of total transmission has been described by the Brewster law,and this can also be viewed as a behavior of optical resonance.The total transmission of transverse magnetic or transverse electric fields is always observed at the interface of two isotropic mediums with the same permeability or permittivity.
Investigation on the method of defining atomic ground sta
. 2012, 31(4): 15-15.
Abstract
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870
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339
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On the electron distribution of the outer layer, the electron being grabbed is appeared on the d-shell, which causes the difficulty for defining atomic ground state. Meanwhile, defining few atomic ground states by using general method is not in agreement with the theory, and some books have proposed three different kinds of views about the several atomic ground states. These two kinds of phenomena are analyzed and explained.
Deriving the vibrational energy spectrum of multi-atom molecular by virtue of IEO method
. 2012, 31(4): 19-19.
Abstract
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691
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(316KB) (
429
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For some linear polyatomic molecules, one can conveniently derive energy spectrums and vibration frequencies of the corresponding Hamiltonians in terms of the invariant eigen-operator method stemming from Heisenberg equation. In this way, the further application of IEO method in molecular physics is introduced.
The trial function method for solving Bessel like equations
. 2012, 31(4): 23-23.
Abstract
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747
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451
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A direct method, i. e. , the trial function method for solving linear independence solution of Bessel like equations is proposed in terms of mathematical software
Measuring viscosity coefficient of liquid by Tracker
. 2012, 31(4): 25-25.
Abstract
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1224
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(335KB) (
848
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Software tracker is applied in measuring the viscosity coefficient of liquid oil by dropping ball.By video capture and motion analyze function build in tracker,the trajectory of the falling ball is obtained.Experimental uncertainty lurking in the traditional measuring process is revealed and analyzed.The motion and data analysis by tracker are accurate and visual.The results show that the tracker is capable in exploring more complicated motion of fluid.
Simulation of the characteristics of coupled pendulum with mutual inductance
. 2012, 31(4): 28-28.
Abstract
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1165
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(420KB) (
764
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The characteristics and coupling process of coupled pendulum are analyted. The approach to simu-late coupled pendulum with mutual inductance is proposed. With a kind of homemade simulation device based on series LC circuit, the coupling of oscillation and energy exchanging process between two pendulums are demonstra- ted. As the mathematical equations of the mechanical coupling and mutual inductance coupling are nearly same, to compare these two kinds of coupling models will help students to improve their capability of mathematical modeling and the ability of analyzing complex system.
Experiment and analysis on hole’s periondical flow between alcohol and water
. 2012, 31(4): 33-33.
Abstract
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658
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(577KB) (
303
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An experimental device for alcohol-water periodical flow is introduced,the experimental phenomenon is described and the experimental data are analyzed.Based on the data,we depict graphics with computer software.Through repeated experiments and analyses,some oscillation laws of the alcohol-water periodical flow,which are not same as the oscillation laws of past saline-water,are shown.
Dimension and system of physical quantities
. 2012, 31(4): 40-40.
Abstract
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765
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(506KB) (
536
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Based on the introduction of system of quantities and units, this article systematically clarifies the definition of physical quantities and provides analysis and discussion of issues regarding physical quantities fre-quently cited in the literatures.
Discovery of Faraday Effect
. 2012, 31(4): 44-44.
Abstract
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792
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(714KB) (
558
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Morichini and Herschel＇s work on exploring the interaction between magnetic and optical is intro- duced, and the course for Faraday to discover Faraday effect is reviewed. Faraday＇ s charactersistics of the research which combines front-line science and philosophical reflection is analyzed, and Faraday＇ s innovative spirit and in- domitable perseverance in researches are also analyzed.
The physicist who had the most apprentices to win the Nobel prize
. 2012, 31(4): 50-50.
Abstract
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1319
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(532KB) (
832
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The 20th century was the golden century of physics.When people talk about the great educational masters of physics,a professional physicist would recall J.J Thomson,Ernest Rutherford and Niels Bohr,they are the best educationists of physics.The main reason is that they had several pupils who had gained the Nobel prize,In fact,Max Born who constructed the Gttingen school of physics,in Gttingen,Frankfurt and Edinburgh,he had taught and affected more than 10 young scientists and help them to gain the Nobel prize.Born’s success led him enter the top ranks of great educational masters of physics in 20th century.
The development of the simulation system for Doppler effect teaching
. 2012, 31(4): 55-55.
Abstract
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755
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(778KB) (
530
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The Doppler effect is the apparent change in the observed frequency of a source due to the relative motion between the source and the receiver. The Doppler effect is used in many different applications. To help teachers in the training of pupils the Doppler effect, a simulation system is achieved by visual basic 2010 express e- dition （VB2010） software with OpenAL and OpenGL. The simulation system optimized to create 3D positional sound and Doppler effecting use only two speakers. Further, it is more efficient modalities for learining the Doppler effect over other instructional methodologies and media. The application in Doppler effect teaching showed that the system has a good interactivity, verisimilitude and practicability.
The absorption and reflection of sound
. 2012, 31(4): 60-60.
Abstract
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874
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(242KB) (
450
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The experimental curve of sound amplitude varied with the propagation distance is measured in the experiment. Considering dissipation factors such as absorption and reflection, this paper gets the absorption coefficient of the air and the reflectance of the transducer with the view of wave physics.
Preparation of CdS/ZnS core/shell heterostructure nanowires by vacuum thermal evaporation
. 2012, 31(4): 63-63.
Abstract
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785
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PDF
(566KB) (
445
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The conventional vacuum thermal evaporation is modified to fabricate CdS/ZnS core/shell heterostructural nanowires.Firstly,CdS nanowires are synthesized by catalyst-assisted vacuum thermal evaporation.Then,ZnS shells ard deposited on the CdS nanowires by the secondary evaporation.Investigations by XRD,EDX and TEM demonstrate that the cores of the heterostructural nanowires are single crystals of CdS and the shell of ZnS are polycrystalline.The method presented here is facile and the heterostructures have potentials is nano-devices.
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