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Table of Content
20 May 2009 Volume 28 Issue 5
著者文摘
The statistical law of the nearly independent particle system （Ⅲ） -Canonical distribution function and energy fluctuation formula
. 2009, 28(5): 1-1.
Abstract
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1094
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690
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Starting from the Gibbs ensemble theory, we derive the canonical distribution function and energy fluctuation formula for two-dimensional and three-dimensional mechanic systems that consist of arbitrary number and different masses of rigid particles. The results of our computer simulation are in agreement with the theory.
The complex tensor formulation of electromagnetic field
. 2009, 28(5): 6-6.
Abstract
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1030
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(263KB) (
447
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The four-dimensional complex tensor formulation for the electromagnetic field is obtained based on the framework of three-dimensional complex vector. The present complex tensor formulation is then generalized to the case of magnetic monopole using the double-potential formalism, and the double-potential complex-tensor Maxwell equations for both electric and magnetic charges are derived.
Electric moment of electron
. 2009, 28(5): 9-9.
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904
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423
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Based on the relevant results of the Dirac equation, this paper points out that the electric moment of electron exists a high-order effect besides the familiar magnetic moment.
The oscillation of a diatomic chain with on-site potential
. 2009, 28(5): 11-11.
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839
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832
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The dispersion relation of a diatomic chain has two branches. For a diatomic chain with on-site potential, both these modes are optical ones, because there is also a natural gap for small wave numbers in the lower branch of dispersion relation. In the case of long wavelength ＂acoustic＂ modes, the amplitudes of the two atoms within each cell are not identical. The long wavelength ＂acoustic＂ modes are not the motions of the center of mass.
Renormalization group solution for the Ising model using square block spin
. 2009, 28(5): 14-14.
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834
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766
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Renormalization group calculation is performed on the square lattice by choosing a square as block spin, the spin state is defined through three rules. The result is much more accurate. The problem of performing renormalization calculation with block spin that has even spin in it is resolved.
Calculation of magnetic force by using stress tension
. 2009, 28(5): 18-18.
Abstract
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1365
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1220
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The Maxwell stress tensor is used to calculate the force of magnetic attraction between two hemispheres of a uniformly charged spinning spherical shell. The advantage of this method is shown from this example.
The exact expression of self-inductance for a tightly wound cylindrical solenoid of finite length
. 2009, 28(5): 21-21.
Abstract
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1014
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(247KB) (
698
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For a tightly wound cylindrical solenoid of finite length, the expression of self-inductance in the integral form is derived by means of the Bessel functance expansion. The two expressions of self-inductance in the series form are obtained by using the direct integration method. Some simple analysis and comparison on the two expressions are presented.
Quantum calculation and simulation for motion of particle in potential field
. 2009, 28(5): 24-24.
Abstract
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676
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321
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The density distributions of particle in various potential fields are simulated based on the quantum mechanics with Matlab using an exponential difference algorithm. It is found that the density distribution of particle changes obviously with the change of potential field and entrance mode of particle. The simulation can be widely used in various quantum mechanical problems.
Exploring and analysis on the operational question of operator
. 2009, 28(5): 26-26.
Abstract
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848
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297
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In the quantum mechanics, the whole characteristic can be reflected well using the operator. Meanwhile, the mechanical properties can be distilled from the wave function by the operator. When solving or inferring the relation of operators, we not only grasp the significance and property of the related operator, but also understand some basic operational methods of operator. This paper introduces several common operational methods of operator in the quantum mechanics through giving examples. Such as the direct, functional, parameter differential, undetermined operator, integral transform, mathematical induction methods and so on.
Deduction of generalized Ehrenfest theorem by using the entangled state representation
. 2009, 28(5): 30-30.
Abstract
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901
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639
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The Generalized Ehrenfest theorem is deduced by using the entangled state representation, that is the common eigenstate of relative coordinate and general momentum of two particles. It is shown that not only quantum mechanics is self-consistent with classical physics, but also the corresponding classical physics law could be deduced by virtue of the quantum mechanics law.
A post-Newtonian method for calculating the orbital precession of test particles in the gravitational field of charged celestial body
. 2009, 28(5): 33-33.
Abstract
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757
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375
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The orbital precession of test particles in the gravitational field of charged celestial body （ the Reissner-Nordstrom metric field） is discussed using the post-Newtonian approximation method. The effect of charge Q to the orbital precession of test particles is presented.
An improvement of light path adjusting method in light velocity measurement
. 2009, 28(5): 36-36.
Abstract
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879
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(257KB) (
412
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An alternative method of discrete light path adjusting is designed. The theoretical calculation and production practice have proved that the method is operable and the deficiency of quondam method can be avoided.
Application of magneto resistance position sensor to physical experiment
. 2009, 28(5): 38-38.
Abstract
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1240
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891
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The magneto resistance position sensor is composed of AA002 series analog sensors and a little magnetic steel. Positions of either hanged body or water mark are measured. The Young modulus of steel and volume of steel ball are also measured. The experimental result indicates that the magneto resistance position sensor is actable, precision, simple and sensitivity. A series of physical experiments using the giant magneto resistance sensor are designed.
Experimental study of frustrated total internal reflection using microwave
. 2009, 28(5): 43-43.
Abstract
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954
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1221
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This paper reviews firstly the history and applications of frustrated total internal reflection （FTIR）. A simple description of FTIR is presented and the formula of evanescent wave＇ s transmission is obtained. A simple experiment apparatus is established to study the relation between the transmission in FTIR and the thickness of air film, the polarization direction. The experimental results are in agreement with the theoretical analysis quantitatively.
A try to set up selective coures＂ medical imaging physics basis＂ in clinical department
. 2009, 28(5): 46-46.
Abstract
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733
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(432KB) (
553
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On the basis of analysis of present course arrangement in medical college, we prove the necessity to set up a selective course named＂ Medical Imaging Physics Basis＂. The necessity of reformation of teaching method due to adjusting to the pressent situation is introduced,which the course is much more difficult and few hours to be taught. Moreover, we also research the software of three-dimensional animation to be applied in the process of teaching. On the side of teaching material, we write characteristic teaching material to make the teaching material threedimensional and use it in practice.
A nonlinear analysis on stability of a circular orbit effort
. 2009, 28(5): 49-49.
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952
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853
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The use of perturbation energy particles in a circular orbit under the stability problem is studied Comparative analysis for the first-order and second-order approximations of two mass movements under the conditions of the perturbation orbit phase diagram is performed, the two conditions similar to the stability of the circular track conditions are presented.
Numerical calculation of the diffraction by one-dimensional grating
. 2009, 28(5): 52-52.
Abstract
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1124
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(428KB) (
598
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A matrix multiplication method is proposed to calculate the Fresnel diffraction integral, which gives an easy way to numerically calculate the one-dimensional （1D） diffraction problems. Several different kinds of 1D gratings are calculated as examples. The calculated results show that this method is feasible for analyzing the diffraction property of complicated 1 D grating.
Calculation of α-particle＇ s scattering angle in the Thomson atomic model
. 2009, 28(5): 56-56.
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1504
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1034
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Based on the Thomson atomic model and the classical mechanics method, the scattering angle of α- particle passing through the atom is obtained. The result is contradiction with the Rutherford scattering experiment and negates the Thomson atomic model finally in theory.
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