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Table of Content
20 January 2008 Volume 27 Issue 1
著者文摘
The diffraction fields at image-plane belong to the Fraunhofer diffraction
. 2008, 27(1): 1-1.
Abstract
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1047
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867
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A standard integral form whose integrated function equals to the product of the screen function and a linear phase-factor, as a general definition of the Fraunhofer diffraction is proposed. The four devices for receiving this field are shown, especially the receiving set-up of image-plane and its advantages is described. Finally this article introduces to the relationship of the Fraunhofer diffraction and the Fourier transform, and corresponding three kinds of the coherent optical information processing system.
The roads to lead chaos in the pendulum system
. 2008, 27(1): 5-5.
Abstract
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959
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(464KB) (
1140
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The roads that the pendulum system enter chaotic state is studied. Usual roads to lead chaos can be found in the pendulum system. It is a typical system to introduce chaotic phenomenon.
The electric potential and charge distribution of a charged ellipsoidal conductor
. 2008, 27(1): 11-11.
Abstract
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1320
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3118
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The method of finding the electric potential and charge distribution of a charged ellipsoidal conductor is introduced, and some special cases are discussed.
Perturbation method for the problems of the electrostatic field
. 2008, 27(1): 14-14.
Abstract
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751
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(306KB) (
364
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The approximate solutions for the nearly uniform or nearly isotropic electrostatic field is calculated by means of the perturbation method.
The method of Lie algebra in quantum transformation
. 2008, 27(1): 17-17.
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813
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(212KB) (
364
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By means of the generators of Lie algebra, a unitary operator can be obtained. A concise diagonalization approach for coupled Boson quadratic Hamiltonation is also given.
The logical, open-minded and creative thoughts in physics
. 2008, 27(1): 20-20.
Abstract
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931
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(380KB) (
846
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The differences among the logical, open-minded and creative thoughts in physics studies and research are studied. It is especially emphasized the importance of gradually fostering our students to creatively think of the nature and then wish to achieve great breakthroughs in the future.
What is the mass of an object？
. 2008, 27(1): 24-24.
Abstract
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1171
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(223KB) (
622
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Based on the special relativity, the essential meaning of the mass of an object is analysed. It is shown that the mass of an object is a parameter which imply the total energy on the mass centre frame of reference, the inertia and attraction are both the physical characteristics of the mass.
Equations of the equipotential lines and the electric field lines of a line charge within a thin cylindrical conductor
. 2008, 27(1): 27-27.
Abstract
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870
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PDF
(142KB) (
392
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By mirror image method and regularity of analytical function, the expression of the electric potential and intensity of a line charge within a thin cylindrical conductor are obtained, and the equations of the equipotential lines and the electric field lines are obtained.
The difference and relation between the defect of 1-D photonic crystal and F-P cavity on optical path
. 2008, 27(1): 29-29.
Abstract
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722
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(317KB) (
434
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The model of the defect of 1-D photonic crystal, which is detect in symmetry, is set up oaseu on the solution of eigen matrix. Three instances are simulated by computer. Comparing the transmission spectrum of simulation with one of F-P cavity, it is concluded that the optical path of the defect is equivalent to one of F -P cavity only in specific condition, they are not equivalent in common conditon.
Discussions on several problems about the elliptic polarization
. 2008, 27(1): 33-33.
Abstract
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1152
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(303KB) (
529
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Several problems about the light wave with elliptic polarization are studied. The problems include how to make the amplitude resolution in rectangular coordinate, and how to determine the total intensity, the intensity passing through a polarizer,and the instantaneous intensity of a light wave with elliptic polarization.
Two experiments on a physics experimental design theme
. 2008, 27(1): 36-36.
Abstract
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761
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(256KB) (
457
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From the aspects of moment of inertia and tone of sound, the authors give two schemes to a physics experimental design theme： to distinguish two metal ball of the same radius and mass.
The velocity measured by couple gratings
. 2008, 27(1): 39-39.
Abstract
(
1021
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PDF
(318KB) (
729
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As the Doppler shift of couple gratings is direct proportional to the velocity of the moving grating, the velocity can be measured by measuring the Doppler shift. Having analysed the uncertainty of velocity , the conclusion is that the relative uncertainty of measured velocity equals the relative error of grating constant.
The application of BP neural network in quantitative spectral analysis for prism spectrograph
. 2008, 27(1): 43-43.
Abstract
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719
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(309KB) (
303
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BP neural network is used to fit the nonlinear function of spectral plane position versus wavelength for the known light source in prism spectrograph. The comparison of iron spectra is omitted to measure unknown spectral wavelength. The quantitative spectral analysis is simplified. The level of automation and intellection for instrument is improved.
Application of developmental evaluation in college physics experiment teaching
. 2008, 27(1): 46-46.
Abstract
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680
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PDF
(490KB) (
712
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In order to improve the present evaluation of college physics experiment, the application of developmental evaluation is proposed. Two practical modes are discussed. The first mode is to evaluate students＇ performance in routine experiments by themselves, partners and teachers. The second mode is to combine worksheets with observation in operating examination. Comparative studies of the two modes were carried out, showing that developmental evaluation could be effectively applied to improve the results of experiment.
A new measurement and an analysis of complex permittivity based on a simple RC circuit
. 2008, 27(1): 51-51.
Abstract
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897
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PDF
(338KB) (
368
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A new method applying a simple RC circuit is put forward to measure complex dielectric permittivity. Compared with the professional apparatus HP4294A, this method is proved to be not only simple, but reliable. Also an analysis of the experiment result performed on PZT5 piezoelectric ceramic is presented.
The analyses of confirming the film thickness by the ellipsometer
. 2008, 27(1): 56-56.
Abstract
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1189
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PDF
(220KB) (
375
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The ellipsometer can measure the film thickness in a period and its refractive index. The article investigates that the farthest fathomable periodicities and the farthest film real thickness are existent when the variable incident angles are used to confirm the film real thickness. The graphics mode is proposed to describe the connection between the periodicities, the period, the film thickness in a period and the incident angle.
Proof of the Bloch theorem in an infinite crystal by central equation
. 2008, 27(1): 59-59.
Abstract
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1131
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(137KB) (
418
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The central equation in an infinite crystal is obtained by Fourier analysis of the wave function. The Bloch theorem in an infinite crystal is proved by the central equation.
A more reliable solution to the general Zeno paradox
. 2008, 27(1): 60-60.
Abstract
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1056
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(321KB) (
377
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In a paper appeared in College Physics （Vol. 25 （5）, 2006）, the authors have analyzed the general Zeno paradox, but what they analyzed is not the uniform motion of the paradox, and what is more, there are errors in their deduction. In this work, by drawing a VPV model out of the general Zeno paradox and analyzing it, it is found that the relation of the initial and final status is of many-to-one for the paradox and that the general Zeno paradox is not a paradox.
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