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Table of Content
20 June 2009 Volume 28 Issue 6
著者文摘
Analysis and discussion on the similarity of Fresnel diffraction patterns
. 2009, 28(6): 1-1.
Abstract
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817
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(364KB) (
493
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Different from Fraunhofer diffraction, Fresnel diffraction has been considered to have no the property of similarity. However, our study shown that Fresnel diffraction patterns also have similarity property under certain conditions. In this paper the general requirement for this property is given, and the relation between the scale of the Fresnel diffraction pattern and the parameters of the diffraction system is quantitatively derived. As an inferences, some special cases such as the circular aperture diffraction and straight-edge diffraction are discussed and a series of important conclusions are obtained.
Boundary conditions for magnetic vector potential and infinity in physics
. 2009, 28(6): 4-4.
Abstract
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991
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(470KB) (
623
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Some viewpoints on boundary conditions of magnetic vector potential are criticized, and the conven- tional methods are justified. The properties of infinity in physics are clarified form the mathematical viewpoint. Mo- reover, a more general boundary condition for tangent components of vector potential is proposed, and the mathe- matical essence of all boundary conditions is given.
A discussion for uniform-velocity curvilinear movement
. 2009, 28(6): 9-9.
Abstract
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779
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636
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Several kinds of uniform-velocity curvilinear movement are shown by mathematical calculation.
The magnetic field distribution of a current-carrying thick-wall solenoid with finite length
. 2009, 28(6): 12-12.
Abstract
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1053
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(328KB) (
1162
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For a steady current-carrying tightly wound thick-wall solenoid with a finite length, the expression of vector potential is derived by using the method of cylindrical function expansion. The expressions of magnetic field distribution in the integral form are presented by employing the relation between vector potential and magnetic induction. The expressions in the series form of the interior and exterior magnetic field distribution of magnetic field of a thick-wall solenoid are calculated by means of the integration method directly. The magnetic field at central axis is obtained by applying the formulae of this paper.
Calculation of matrix elements of coordinate operator of harmonic oscillator with integer power by coherent state functions
. 2009, 28(6): 15-15.
Abstract
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696
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(237KB) (
424
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Matrix elements of coordinate operator with integer power in the bases of harmonic oscillator are de- rived by using the properties of coherent state functions. The method used in this paper has its merit in comparison with other documents.
Discussing on the recurrence relation of the Hermite polynomial also
. 2009, 28(6): 17-17.
Abstract
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1466
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(163KB) (
1554
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The recurrence relation of the Hermite polynomial and the recurrence realation of the coefficients in- sid Hermite polynomial are developed from mother ruction of Hermite polynomial.
An experimental approach for measuring liquid surface tension coefficient with digital oscilloscope
. 2009, 28(6): 18-18.
Abstract
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864
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PDF
(264KB) (
453
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A spring as an inductance turn and a sampling resistance are made up of a RL series circuit. Under the prompting of alternating current, the relation of the acting force and the sampling voltage is measured with a dig- ital oscilloscope, thus the liquid surface tension coefficient is obtained.
Simulation and experimental study of the viscosity coefficient for liquid experimentation
. 2009, 28(6): 21-21.
Abstract
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698
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(269KB) (
326
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The interrelated operating procedure is introduced in the simulation of the experimentation of viscosi- ty coefficient for liquids. In comparison with experimental data getting from the object experiments, the error of simulation software is small. The error can be controlled in a little range, so that the students＇ attention will focus on the theory of this experiment.
Analysis on the distance parameters in the biprism interference experiment
. 2009, 28(6): 24-24.
Abstract
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912
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(185KB) (
1009
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The relation between the distance parameters of the optical components and their influences on the measurement of wavelength in the biprism interference experiment is analyzed. Based on this analysis, the sugges-tion on how to set the distance parameters properly so as to improve the measuring efficiently is proposed.
Relaxation of wall and relation to external magnetic filed in optical-magnetic resonance experiment
. 2009, 28(6): 26-26.
Abstract
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825
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(391KB) (
610
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With the improved DH-807 optical-magnetic resonance apparatus, the relation between the saturat- ed relaxation value of the optical pumping signal and the total intensity of the external magnetic field is measured ; a new theoretical model for explaining the results is offered and proved by the experimental results and correlated with other elaborated results.
Experimental study on the dispersion curve of mercury spectrum
. 2009, 28(6): 30-30.
Abstract
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1168
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(256KB) (
1596
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Based on the existing theory, the refractive index of eight spectrums for mercury spectrum is ob- tained by a dispersion experiment. The empirical formula of dispersion function for wavelength and refractive index is presented by the polynomial fitted and the angular dispersion of mercury spectrum is also obtained. This is bene- ficial to people understanding dispersion further.
Development of multifunctional microwave plasma teaching and investigation device
. 2009, 28(6): 33-33.
Abstract
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631
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(390KB) (
404
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Multi-functional microwave plasma teaching and investigative device are developed for the colossal distance between teaching investigation and application of plasma technology. The frequency 2.45 GHz microwave incentive rarefied gas discharge is used to form axisymmetric plasma. Plasma without the internal electrode can a- void discharge pollution. Microwave, vacuum and cooling technologies have been integrated in the device, so it is stability and cost-effective. The equipment has been used for the experiments of diamond films deposition and plas- ma diagnosis, and the results are very well.
Laser-plasma physics in speedy progress
. 2009, 28(6): 36-36.
Abstract
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844
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(410KB) (
580
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The course of development and status quo of Laser-plasma physics is introduced briefly.
The general physics experiment： measurement of the adhesive force of the thin film using topple test
. 2009, 28(6): 40-40.
Abstract
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897
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(306KB) (
458
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A measurement of the adhesive force of the thin film using topple test can be used as the general physics experiment. 200nm-thick Ag films are prepared by using a simple DC sputtering system. The adhesion of the films are measured using topple test. The experiment can well train students with the ability analyzing and resol- ving problem.
Manipulating and measuring polarizations conversion of electromagnetic wave by anisotropic metamaterials
. 2009, 28(6): 43-43.
Abstract
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794
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(401KB) (
540
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Reflected from anisotropic metamateiral slab, polarization states of electromagnetic wave can be ma- nipulated with great freedom, and may have complete polarization conversion under certain conditions. In this paper we present our designing and performing of an experiment aimed at measuring the polarization conversion of electro- magnetic wave, based on the laboratory＇s microwave system. We show the result of our experiment as we found con- siderable polarization conversion at certain frequencies. We also purpose a new approach to enhance the polarization conversion ratio （PCR） and have testified it through experiment. Numerical simulations are employed to compare with the experimental result.
Relation between imaginary part of dielectric function and the conductivity
. 2009, 28(6): 47-47.
Abstract
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3164
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3903
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Based on the ε＇ （ω） and complex dielectri definition of di function ε （ω） dielectric function. Calling ε＇（ω） ＂ complex electric function and the meaning of its imaginary part, the function are compared and analyzed. The function ε＇（ω） is not the complex dielectric function.Calling ε＇（ω）＂complex dielectric function＂ is not proper.
Exploration and practice of a new automatic measurement instrument for Young＇s modulus
. 2009, 28(6): 49-49.
Abstract
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815
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(391KB) (
456
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An automatic measure instrument for Young＇s modulus by a method in dynamic state is introduced. The Young＇s modulus automatically on the base of its adoption of sweep measurement technology is measured and computed by using this instrument. It can also adjust the false resonance and supply the quality factor, which is of great help for improving the accuracy of the results.
Solving energy eigenvalue of n module coupling harmonic oscillators by virtue of quadratic form
. 2009, 28(6): 53-53.
Abstract
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941
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(641KB) (
802
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A unitary matrix is constructed by virtue of quadratic form theory for coordinates and momentums transformation. The Hamihonian of the n-D coupling harmonic oscillators is diagonalized by means of the transfor- mation. The exact solution of energy spectrum of n-D coupling quantum harmonic oscillator is given. It also offers a general mathematic method solving problems of this kind.
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