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Table of Content
20 July 2007 Volume 26 Issue 7
著者文摘
The effect of the flat rate of the earth on the orbit planes of satellites
. 2007, 26(7): 1-1.
Abstract
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846
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318
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The effect of the flat rate of the earth on the orbit planes of satellites is discussed and the design principle of sun-synchronous orbit of satellites is introduced.
Symmetry of eigen-functions for a single particle and the shape of the potential
. 2007, 26(7): 4-4.
Abstract
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816
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287
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It is shown, by an example of a single nucleon moving in a triaxial deformed potential, that the symmetry of the eigen-functions of the particle is determined by the form of the potential, and the potential is in turn dependent on the shape of the nucleus which produces it. When the symmetry of the potential varies with the deformation parameter, the change of the symmetry for the eigen-function can be expressed through the representation transformation of the quantum mechanics calculation or by the representation transformation of the eigen-function. Although the problem comes from nuclear structure theory, the idea of this work has the common significance for an independent particle moving in a mean field such as in quantum systems of atoms, molecules and clusters.
Treatment of the integral divergence in computations of vacuum polarization for photons with the method of approximate values of Dirac δ function
. 2007, 26(7): 11-11.
Abstract
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812
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315
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With the extension rule of the method of approximate values of Dirac δ function a new regularization equation of vacuum polarization （self-energy） for photons is developed with （n ↑ ） as the regularization parameter which has the same dimension as 4-momentum, the equation is similar to that in reference books such as that of dimensional regularization. The separate amplitudes of tree-level and l-loop contributions of the system are determined, the counterterm and the renormalized amplitudes are further derived while the latter is all the same to that in reference books. Finally the counterterm Lagrangian is determined.
On unipolar induction phenomenon
. 2007, 26(7): 15-15.
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1113
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475
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The history of the phenomenon of unipolar induction is reviewed, and the unipolar induction experiment of Bartlett et al is analyzed which is considered to be conclusive. It is found that using iron pipe for magnetic screen in Bartlett＇s experiment is unreasonable, and therefore their experimental conclusion is questionable. A possible method to improve the experiment of Bartlett et al is proposed. So the controversy of theoretical explanations of unipolar induction is still an open question.
Analysis of motion of a particle on a free smooth flute
. 2007, 26(7): 18-18.
Abstract
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707
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(197KB) (
282
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A particle＇s motion on a free smooth flute which intersects motive plane of the particle is general curve is investigated. The track equation of the particle＇s motion in inertial frame of reference is deduced, the strict isochronism vibration condition is given,and periods of the particle＇s vibration on some familiar curves are obtained.
The mutual inductance of any two coaxial circular coils and the distribution of the magnetic induction line from the system
. 2007, 26(7): 21-21.
Abstract
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971
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741
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The function formula for the mutual inductance of the any two coaxial coils system is derived by the magnetic vector potential of a circular current. The images of the function varying to the distance of the two coils and to radius of the two coils equation of the magnetic induction is drawn scientifically and exactly by line from any two coaxial coils system mathematical software ＂MatLab＂. The is derived from the magnetic vector potential of a circular current yet. The distributional images of the magnetic induction line of coaxial coils system satisfying the equation is drawn by mathematical software ＂MatLab＂.
Logical system of relativistic dynamics
. 2007, 26(7): 25-25.
Abstract
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727
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(327KB) (
344
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The constitution of logical system of physics is expounded. Based on the fundamental thought of Mach＇s logical system of classical dynamics, a rigorous logical system of relativistic dynamics is proposed. The operational definition of mass and force under general case （high or low speed） are given, and the definition of force given by Mach that force is equal to the product of mass by acceleration is criticized and revised. More is discussed, such as experimental verification of Newton＇s second law.
A new method on solving the problems of static electric field of an infinite line charge and a conductor cylinder
. 2007, 26(7): 29-29.
Abstract
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672
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(195KB) (
396
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Conformal mapping is used to simplify the boundary condition, so the electrical potential outside the conductor cylinder can be easily written. The result is also discussed detailedly and the equipotential line maps are plotted by the mathematical software.
A simple method for deriving the magnetic induction of the circular current
. 2007, 26(7): 32-32.
Abstract
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831
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396
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Avoid the fussiness elliptic integral method, firstly the magnetic induction density of the circular current is derived tersely by the calculus, and then it is turned to the formulas for the magnetic induction of the elliptic integral.
A study of optical transmission through rain
. 2007, 26(7): 34-34.
Abstract
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825
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490
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Attenuation for optical transmission through rain and the property of raindrop size distribution are reviewed. It is introduced and discussed both the scattering model and the non-scattering model. The latter model is discussed in length. Also by using a new and relatively accurate drop size distribution model it is calculated both the maximum distance that optical waves can penetrate through rain and the attenuation for light intensity.
Thermal conductivity measurement by thermal line method
. 2007, 26(7): 40-40.
Abstract
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844
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(240KB) (
392
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The principle and method of the thermal conductivity measurement are discussed based on the thermal line method on SHT- 20 automatic measurement apparatus. And the correspending results is also given and analyzed.
The key technique to obtain high-precision data of the output frequency difference
. 2007, 26(7): 43-43.
Abstract
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662
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(240KB) (
245
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In many frequency measurement the accuracy of the data obtained is mainly depending on the frequency difference △ f= f- f0. Howerer, when the measurement is made, the original frequency f0 is disappeared. The trick using self-locking technique of PLL is reported and both f and △f can be measured accurately.
The study of the tube filled Ar in Frank-Haze experiment
. 2007, 26(7): 46-46.
Abstract
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989
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1084
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The Ar atomic excitated voltage are studied from the experiment in different parameter, and the experimental curve are analyzed; The optimum parameter are the filament voltage is 3.2 V, the grid voltage is 1.0 V and the spurn voltage is 10.0 V are brought forward to use the F-H experiment. The first excitated ex- plode voltage of Ar is 11.6 V. The result shows the value should be the first sub-tranquilization excitated voltage, or the two sub-tranquilization probability ratio.
The research of beam splitter in quantum key distribution
. 2007, 26(7): 49-49.
Abstract
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733
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323
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The development of the quantum key distribution is the fast and the most practically in quantum information. The beam splitter is one important component of the quantum key distribution. The classical and quantum analysis about beam splitter are accordant.
Idiosyncrasy and technique of digitization technology in education
. 2007, 26(7): 52-52.
Abstract
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668
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(415KB) (
302
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Technological digitization plays a key role in teaching innovation, through which the degrees of expression are extended to new exhibitive space of time, color, illumination, grayscale, and transparency. Color can be manipulated to demonstrate equipotentials and contours etc. as in fluid, temperature, density, and so on. Illumination or grayscale takes a vivid look at electron clouds or distribution of possibility waves in atoms. It can be summarized that digital technology oversteps the traditional expressivity in education.
Analytic solutions of the electric field lines induced by lined-up charges
. 2007, 26(7): 57-57.
Abstract
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782
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811
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Analytic solutions are obtained by solving the differential equations for the electric field lines produced by lined-up charges. The characteristics of field lines are discussed on the basis of the solutions for the equations. Also the graphs of field lines are drawn with Mathematica soft ware on computer.
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