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Table of Content
20 February 2007 Volume 26 Issue 2
著者文摘
Fresnei diffraction of a plane transmission grating
. 2007, 26(2): 1-1.
Abstract
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1084
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(304KB) (
1110
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Based on Fresnel diffraction theory, the diffraction field of a spherical wave through a plane transmission grating is studied in detail. The amplitude distribution of Fresnel diffraction and a calculation formula for Fresnel diffraction angle of a grating are given. The waves in each order of Fresnel diffraction are spherical waves under ideal conditions. The diffraction angles can still be given by the grating equation of Fraunhofer diffraction after Fresnel diffraction angle is redefined.
General formula of perturbation matrix elements of three dimensional harmonic oscillator in uniform magnetic field
. 2007, 26(2): 5-5.
Abstract
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994
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PDF
(277KB) (
386
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The general formula of perturbation matrix elements of three dimensional harmonic oscillator in uniform magnetic field are derived using the properties of the general Laguerre polynomials. The complete removal of degeneracy of n = 3 energy level is discussed.
Theoretical derivation of the shape of X-ray diffraction line
. 2007, 26(2): 8-8.
Abstract
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800
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(253KB) (
446
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The curve shape of the X-ray diffraction line is derived by considering the difference of absorption between different crystal plans. The exact expression for the curve is obtained, which is different from that of the interference function calculated from the grating diffraction used to describing crystalline diffraction. Our result is varified by compare the theoretic expression with experiment data. As a result, the deviation between them is less. It is therefore verified that the absorption of the X-ray is a main factor for affecting the shape of the diffraction line.
A discussion on oblique collision of two smooth bodies from the storage coefficient of the elastic potential energy
. 2007, 26(2): 11-11.
Abstract
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793
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(152KB) (
557
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A definition of the storage coefficient of elastic potential energy of a body is given and the oblique collision of two smooth bodies is discussed using this definition. The formula of the relation between the kinetic energies of the system in the two states before and after the instant of the collision is deduced.
Discussion about saturated vapour pressure of curved liquid surface
. 2007, 26(2): 13-13.
Abstract
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923
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(277KB) (
741
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Two methods of formulization are compared and analysed for the saturated vapour pressure of curved liquid surface. The differences and relations between two methods are investigated. It is pointed out that they are based on the same principle if one researches into the problems of phase equilibrium.
More discussion about charging process on energy transfer in ideal parallel plate capacitor
. 2007, 26(2): 17-17.
Abstract
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727
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PDF
(214KB) (
336
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By calculation, it is turned out that the electromagnetic field is not uniform in the process of charging and thereby the question of transfer of energy in the process of charging is solved.
Two kinds of right methods used in the course of choosing independent cycle circuit
. 2007, 26(2): 19-19.
Abstract
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1597
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PDF
(211KB) (
507
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The right selection of independent cycle circuit in the calculation of Kirchhoff law is studied. Two methods, namely, the method of single chain cycle circuit and the method of plane net hole are given.
The calculation of the magnetic field of cylindroid solenoid by Zhukovsky conversion
. 2007, 26(2): 22-22.
Abstract
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756
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PDF
(207KB) (
628
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By using the Zhukovsky conversion in the complex coordinate system, the magnetic field of a cylindroid solenoid is calculated
Thermodynamic properties of non-ideal Fermi gases in lower temperature
. 2007, 26(2): 25-25.
Abstract
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822
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(218KB) (
522
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The weak interaction universally exists in actual gases, the analytical expressions of chemical potential, pressure, entrophy and heat capacity at a constant volume for actual gases in the absence of external potential are derived using total energy deduced by pseudo potential method, then based on the derived expressions, the effects of inter-particle interaction on the properties of Fermi gas systems are discussed.
An introduction to experiment demonstration model of solar power satellite
. 2007, 26(2): 28-28.
Abstract
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819
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PDF
(364KB) (
368
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An X-band waveguide model for experimental demonstration of power transmisson by beamed microwave was developed. Based on that, the principles of xenon lamp and microwave sulphur lamp and their application to illuminate solar panel in laboratory are simply introduced, some parameters of a specific silicon solar panel providing power for microwave generator are described, microwave in the model is produced by a gunn diode and its correct usage is indicated, an expression to estimate electric field of a cylindrical horn in Fresnel region is given and the dependence of transmission efficiency of two identical rectangular horns on distance is shown, mechanism of microwave semiconductor diode is explained, the experimental results of several point-contact silicon diodes are summarized.
A compositive experiment based on the digital oscilloscope
. 2007, 26(2): 32-32.
Abstract
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808
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PDF
(318KB) (
599
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A compositive experiment is introduced which can make multianalysis to the same physical phenomenon by a simple device which is equipped with a digital oscilloscope, it can validate the law of Faraday electromagnetic induction, measure the acceleration of gravity with the application of electromagnetic induction and analyze the distribution of magnetic density for a bar magnet qualitatively.
Analysis and amelioration of viscosimeter
. 2007, 26(2): 35-35.
Abstract
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788
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PDF
(284KB) (
449
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The problems of measuring elements of viscosimeter are discussed, the ameliorating measuring equipment is introduced
The principle and application of tabletop high intensity laser
. 2007, 26(2): 39-39.
Abstract
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721
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PDF
(339KB) (
332
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The development of tabletop laser and CPA technique are introduced in brief. An analysis of the efficiency and value of tabletop high intensity laser is given and the prospects for its future applications are presented.
A computer image analyzing system for fringes in Twyman- Green interferomete
. 2007, 26(2): 42-42.
Abstract
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1112
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PDF
(250KB) (
907
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A computer image analyging system for fringes in Twyman - Green interferometo which is combined by computer, CCD and MATLAB. This system can process interference signal and is fit for assistant teaching of physical optics.
Nobel prize of physics and the history of the definition of metre
. 2007, 26(2): 45-45.
Abstract
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784
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PDF
(254KB) (
498
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The history and the significance of the definition of metre are investigated. The internal relationship between the former awarded Nobel prize of physics and the definition of metre is briefly presented.
Digitization of magnetic fields of electric currents and its applications to physics teaching
. 2007, 26(2): 48-48.
Abstract
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715
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PDF
(217KB) (
262
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Using modern digitization technology, magnetic fields produced by current loops and a current-carrying solenoid are successfully digitized and visualized. It shows the importance of digitization in physics teaching because the magnetic fields in space are traditionally beyond fundamental physics. Additionally, it enriches the teachable contents of electromagnetism and improves students＇ ability to challenge practical problems.
Significance to properly introduce chaos control and synchronization in college Physics teaching
. 2007, 26(2): 50-50.
Abstract
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932
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(514KB) (
417
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Expatiating on the significance of introducing nonlinear theoretical in college physics teaching, in particular, introducing chaos control and synchronization. Both are essential for undergraduate to comprehensively understand chaotic theory.
A simple model for the cavity black-body radiation and some conclusions
. 2007, 26(2): 56-56.
Abstract
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1111
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PDF
(221KB) (
416
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A simple model is introduced to depict the energy exchange between the cavity wall and the radiation field in the establishment of cavity radiation. Some conclusions are discussed concerning the property of the equilibrium field, Kirchhoff＇s law of thermal radiation, and the relation between the cavity and a black-body.
The research of chromatic dispersion on solutions with different concentration
. 2007, 26(2): 59-59.
Abstract
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974
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PDF
(409KB) (
811
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Chromatic dispersal curves in sodium chloride and glucose solutions with different concentrations are measured with triangular prism method, According to Cauchy experimental formula, the relationship between some constants in the formula and the concentrations is obtained. After theoretical analysis, the results of our experiment are interpreted and a useful and simple rule is obtained.
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