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Table of Content
20 February 2011 Volume 30 Issue 2
著者文摘
Analyzing for low energy scattering by a central potential
. 2011, 30(2): 1-1.
Abstract
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795
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(487KB) (
474
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Four different results for low energy scattering by a short-range central potential are summarized： 1. The differential cross section is finite and isotropic; 2. The differential ross section is finite but significantly aniso- tropic; 3. Zero energy resonance; 4. Ramsauer-Townsend effect. The conditions for these results are analyzed in detail. They are closely related to the behavior of the zero energy solutions. The results for several simple potentials are presented and the general conclusions are verified.
Research on a trap of solving problem involved a soft cord by using momentum theorem
. 2011, 30(2): 5-5.
Abstract
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997
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(390KB) (
949
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A misunderstanding for a cord being lifted up or falling down is analyzed, there is a point of sudden change of velocity in it. A way to solve the problem is proposed and which is examined by experiment.
Some usually misunderstood conceptions about the big bang and the cosmological redshift
. 2011, 30(2): 9-9.
Abstract
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857
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(480KB) (
1948
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Some misconceptions about the big bang and the cosmological redshift are presented. The right explanation is given.
Some noticeable issues on solving electromagnetic field by conformal transformation
. 2011, 30(2): 13-13.
Abstract
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930
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PDF
(301KB) (
689
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Some noticeable issues on solving electromagnetic field by conformal transformation are discussed and electrostatic energy of a confocal revolving ellipsoidal capacitor is calculated.
An explicit formula of electric field intensity E directly by vector potential A in time-harmonic electromagnetic field
. 2011, 30(2): 16-16.
Abstract
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866
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(171KB) (
367
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According to the Maxwell equations and the Lorentz condition, an explicit formula of electric field intensity E directly by vector potential A for time-harmonic electromagnetic field e ^iwt is derived and discussed.
The border problem processing for conductive medium surface
. 2011, 30(2): 18-18.
Abstract
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843
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(192KB) (
739
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The which can offset the should enhance the processing methods for the border problems of conductive medium surface are introduced, writer＇ s teaching about the electromagnetic field and microwave technology. These methods textbooks, guide the students to ponder deeply, and promote their learning ability
Radiation pressure of electromagnetic wave on a conducting mirror
. 2011, 30(2): 20-20.
Abstract
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1013
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(173KB) (
539
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The mathematical expression about the radiation pressure of a monochromatic electromagnetic wave on a flat, perfectly conducting mirror is given from the point of view of Ampere force when the angle of incidence of the wave is equal to zero.
Analyzing for low energy scattering by a central potential
. 2011, 30(2): 22-22.
Abstract
(
663
)
PDF
(253KB) (
311
)
Related Articles
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Four different results for low energy scattering by a short-range central potential are summarized： 1. The differential cross section is finite and isotropic; 2. The differential ross section is finite but significantly anisotropic; 3. Zero energy resonance; 4. Ramsauer-Townsend effect. The conditions for these results are analyzed in detail. They are closely related to the behavior of the zero energy solutions. The results for several simple potentials are presented and the general conclusions are verified.
Solution of the particles bound in one-dimensional square potential well
. 2011, 30(2): 25-25.
Abstract
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1194
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(213KB) (
869
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With the methods of the matrix representation, the wave functions and energy levels are carried out for the particle in one-dimensional square potential well, then the graphical representation of eigenvalue equation, eigenfunction and eigenvalue are presented by using Wolfram Mathematica.
Theoretical analysis on output characteristic of crystal electro-optic modulator based on quarter-wave plate
. 2011, 30(2): 28-28.
Abstract
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1167
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PDF
(353KB) (
1021
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An equation of the modulator optical transmittance and the optical axis orientation of the quarter-wave plate is derived according to the principle of LiNbO3 crystal electro-optic modulation. The output characteristic of the crystal electro-optic modulation based on the quarter-wave plate is analyzed by numerical calculation. The result shows that whenever the quarter-wave plate rotates an angle of π/4, the linear modulation, non-frequency doubling modulation or frequency doubling modulation periodically occurs in turn, and this is in agreement with the experimental result.
The application of university physical simulation, experiment in medical college for nationalities
. 2011, 30(2): 31-31.
Abstract
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680
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(426KB) (
669
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This article analyses the present situation in physics experiment teaching in medical college for nationalities. Based on the present teaching practice, it also offers some practical operating procedures in the assisted instruction of university physical simulation experiment, and the establishment of the whole experimental system. Moreover, the paper further explores the actual meaning of promoting students＇ creativity and the improving the physics experiment teaching in the university.
Research on physical education of MIT
. 2011, 30(2): 34-34.
Abstract
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842
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PDF
(648KB) (
638
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From case textbok and the tion and the mode of enlightenment to our analyse and studying about the educational ideas, professional setting, course system, selected teaching mode of MIT, we get a further cognition of the characteristics of MIT physical educadeveloping the top-notch innovative personnel. We believe that this can provide reference and physical education reform.
An elastic model for the ratio of kinesin＇ s forward step probability to backward step probability
. 2011, 30(2): 40-40.
Abstract
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613
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PDF
(280KB) (
357
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An elastic model by hypothesizing that the two heads respectively contain different elastic elements during kinesin chemomechanical cycle is proposed, and according to the Bohzmann law we obtain the exact expression for the ratio of theprobability of forward step to that of backward step in the presence of load force, which provides a physical explain for the data of Carter and Cross.
The circuit simulations of the phase diagram in damped oscillator system
. 2011, 30(2): 43-43.
Abstract
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920
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PDF
(273KB) (
425
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The correspondence between electrical and mechanical parameters is well known. We build a LC circuit and use the oscilloscope to show the process of electromagnetic oscillations, as a result, it gives a clear phase diagram of viscous damping. Furthermore, circuit simulation can also give a phase diagram of frictional damping with Zener diodes. It is instructive in the teaching process to find the corresponding circuit simulations in solving mechanical problems.
Measurements of optical parameters of turbid media based on diffusion theory
. 2011, 30(2): 46-46.
Abstract
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790
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PDF
(385KB) (
294
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Measurements of optical parameters of turbid media based on diffusion theory with CCD camera are studied experimentally. The method of zone restriction for the purpose of deterinating diffused reflectance center is proposed in order to improve the precision of optical parameters. In addition,the method of obtaining one-dimen- sional data from the line through incident point of light and diffused reflectance center is proposed so as to increase the efficiency of inverse algorithm. Intralipid is used to verify the methods. The experimental results show that the both methods are feasible.
An elementary method for introducing the concept of reciprocal lattice
. 2011, 30(2): 50-50.
Abstract
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1214
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(279KB) (
1765
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The important concept and properties of reciprocal lattice can be introduced naturally from a definition of crystallographic plane, this would avoid some confusions in common textbooks.
New approach to evaluate infinite integrals involving sine and cosine functions
. 2011, 30(2): 53-53.
Abstract
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1521
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(412KB) (
2230
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Based on the residue theorem and the so-called Jordan＇s lemma, a new lemma is proposed to treat integrals along an arc of infinitely increasing radius. A modified approach is suggested to evaluate infinite integrals involving sine and cosine functions. Some illustrative examples are given and thus the effectivity and simplicity of this approach are shown.
The semi-qualitative and semi-quantitative demonstration for the centre light spot （ or light fringe） of the Fraunhofer diffraction by a real obstacle screen
. 2011, 30(2): 58-58.
Abstract
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991
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PDF
(366KB) (
727
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The intensity of diffracted light at the geometric centre of the diffraction optical field is always not ze- ro through diffraction by a real obstacle screen such as a disk or a filament. Clearly, this is the best demonstration of the wave nature of light, and so it is more convincing than that of diffraction by an aperture such as a circular ap- erture or a slit. However. the theoretical analysis for the light spot （such as Poisson point） at the obstacle diffrac- tion field center is usually based on the Fresnel diffraction, while for the majority students who are not majored in physics, they are just required to have the knowledge of Fraunhofer diffraction in the course of university physics, thus it causes difficulty to them to understand the related questions. In this paper, the starting point of argument is directly based on the Fraunhofer diffraction which is familiar to the students majored in science and engineering. By use of the Fresnel integral formula or Babinet principle combined with simple analyze method of semi-qualitative and semi-quantitative, we give two easily ways for solving the problem. It is seen that the argument method is helpful for students to understand the relevant questions.
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