Table of Content

20 December 2011 Volume 30 Issue 12

  

著者文摘

quantum mechanical representations via the two-dimensional normal distribution function in statistics

. 2011, 30(12):  1-1. 

Abstract ( 854 )   PDF (257KB) ( 441 )  

Related Articles | Metrics

Based on the two-dimensional normal distributions in statistics and the technique of integration within an ordered product of operators （IWOP） , the explicit forms in the Fock space of some quantum representations are simply obtained such as coordinate representation, momentum representation, coordinate-momentum intermediate representation, and coherent representation. In addition, their corresponding completeness is also easily proved

A relationship about the stationary bound state of centrally symmetric potential

. 2011, 30(12):  4-4. 

Abstract ( 772 )   PDF (417KB) ( 451 )  

Related Articles | Metrics

For a microscopic particle in a centrally symmetric potential and in its stationary bound state, there is a relationship about the expectation value of the force to the particle. In this paper, several different proofs to this relationship are presented with a discussion to its physics connotation. In addition, the conditions necessary for the relationship to hold is discussed, hence the related misunderstanding or inaccuracy currently in literature is clarified.

Solitary wave solutions for nonlinear

. 2011, 30(12):  8-8. 

Abstract ( 828 )   PDF (304KB) ( 359 )  

Related Articles | Metrics

The nonlinear Schrodinger equation is reduced to a differential equation by use of travelling wave transformation, and the solitary solutions are obtained combined with the Riccati-function method based on the mapping method.

Study of characteristic on Yukawa potential in the K-G equation

. 2011, 30(12):  12-12. 

Abstract ( 976 )   PDF (313KB) ( 583 )  

Related Articles | Metrics

The radial direction equation in the Klein-Gordon equation is calculated numerically, the condition and energy level of Yukawa potential bound states are discussed, and the function images of radial direction is given. The calculation result shows that when the parameter is small, the particles are in the ground state, not easy to be excited. It is also shown that when the parameter is very small, the particle bound state does not exist, and with the increase of the parameters V0, some energy states of low angular momentum disappear. Our analysis indicates that this is a result of centrifugal potential.

The strict theory on the time varying rate of the flux that vector field through moving Gaussian surface

. 2011, 30(12):  16-16. 

Abstract ( 674 )   PDF (443KB) ( 321 )  

Related Articles | Metrics

It is proved that the sequence of integral symbol and derivation symbol could be exchanged when the rate of change over time of the flux that vector field through moving Gaussian surface is calculated. The formula on the rate of change over time of the area element vector on the sports surface is derived. Several algorithms about the rate of change over time of the flux that vector field through moving Gaussian surface are given.

A few processing methods and their comparison of Hartree-Fock equation for atomic structure

. 2011, 30(12):  21-21. 

Abstract ( 1031 )   PDF (448KB) ( 629 )  

Related Articles | Metrics

Several approximate methods of Hartree-Fock equation in the atomic structure theory are introduced. Their respective predominance and defect are summarized by comparing these methods.

Anisotropic medium sphere in uniform field

. 2011, 30(12):  26-26. 

Abstract ( 559 )   PDF (251KB) ( 335 )  

Related Articles | Metrics

The whole space field distributions in the case of an anisotropic sphere placed into a uniform field are presented.

Research on equivalent resistance or capacitor of enhanced polygon network

. 2011, 30(12):  29-29. 

Abstract ( 708 )   PDF (441KB) ( 514 )  

Related Articles | Metrics

Some results for the study of equivalent resistance of regularly connected polygon resistance network have already obtained, however, the study of unitive equivalent is still lacked if the parameter value （resistance or capacitor） in the polygon network is arbitrary constant. We analyze the network, construct a model based on difference equation and study unifying of equivalent resistance or capacitor of enhanced polygon network. We get a laconic general formula of equivalent resistance or capacitor of enhanced polygon network by analyzing the network, and obtain a simple expression of Fibonacci sequence in the meantime. We also expand the polygon concept arrives to two sides structure of the non-Euclid space. The results are compared with connected argument. The conclusion is also suitable to some regularly connected polygon impedance networks.

The study on the simplification of the regularly-connected n-level triangle ladder resistance network

. 2011, 30(12):  33-33. 

Abstract ( 674 )   PDF (242KB) ( 521 )  

Related Articles | Metrics

By using the Y→△ conductance equivalent transformation formula, we simplify the regularly-connected n-level triangle ladder resistor network with the same resistance in each branch circuit into the one-level triangle resistor network. Whose waist edge resistance is nr and whose recursion formula for the bottom edge resistance is Rn=αQn-1（m-β）-βP^n-1（m-α）^-Q^n-1（m-β）-P^n-1（m-α）.

Derivation of the average relative speed of gas molecules

. 2011, 30(12):  36-36. 

Abstract ( 2288 )   PDF (173KB) ( 991 )  

Related Articles | Metrics

Based on the Maxwell velocity distribution and the definition of relative velocity, the distributions of relative velocity and the relative speed of gas molecules are given, thus the average relative speed is clearly expressed.

Demonstration of applicable theory of virtual object imaging

. 2011, 30(12):  38-38. 

Abstract ( 1073 )   PDF (360KB) ( 435 )  

Related Articles | Metrics

Although many articles about the problem of the virtual object imaging were published, they neglect to argue in advance whether the virtual object possessing properties of imaging materials by optics, whether the theories of real objects imaging apply to the virtual objects imaging. All these articles take the virtual objects for the real objects directly, and by imaging methods of drawing diagram of the real objects. With the help of various examples to illustrate imaging methods of drawing diagram of the virtual objects, this paper proves through the conjugate connections between object and image, and the formula of virtual object imaging： virtual object is the object of imaging by optics, possessing all properties of optical imaging object. We can solve the image of virtual object and discuss the property of image by all theories and methods of real object imaging.

Application of frequency-modulated microwave in the experiment of ferromagnetic

. 2011, 30(12):  42-42. 

Abstract ( 699 )   PDF (418KB) ( 298 )  

Related Articles | Metrics

In this paper, we introduce how the frequency-modulated microwave used in the experiment of ferromagnetio resonance. In our experiment, the resonant frequency of the transmission resonant cavity can be measured rapidly by using the frequency-modulated microwave emitted from the klystron. Then, by means of mechanical and electronic tuning, it is very convenient to make the frequency of the microwave resonating with that of the cavity. Based on the former adjusting, the resonant curve of the ferromagnetic single-crystalline materials can be easily obtained.

Study on effects of reversible magnetic area on demagnetization process

. 2011, 30(12):  45-45. 

Abstract ( 768 )   PDF (287KB) ( 552 )  

Related Articles | Metrics

It is not easy to determine the value of the needed reverse external magnetic field in the experiment of static magnetization curve and magnetic hysteresis curve measurement, when the remanent magnetism is very little （ no more than 2.5mT）, so it is hard to realize complete demagnetization. After analysis of the related theory, this paper makes a quantitative study on the relation of demagnetization process and reversible magnetic area. The results have shown that the effective, reverse, minimum external magnetic intensity is approximately equal to the critical external magnetic intensity of reversible and irreversible magnetic area, and the value is nearly 0.55 times of coercive force of the material.

Measures of Harvard university for improving physics teaching quality

. 2011, 30(12):  48-48. 

Abstract ( 746 )   PDF (781KB) ( 520 )  

Related Articles | Metrics

The measures of Harvard university for improving physics teaching quality are discussed deeply. These measures include teaching methods, training teacher, teaching guide and teaching evaluations, which are comprehensive, thorough, concrete and practical and contribute to improve educational quality of Chinese college physics.

e concept of ＂inde ndent circuit＂ in KVL

. 2011, 30(12):  54-54. 

Abstract ( 1090 )   PDF (361KB) ( 390 )  

Related Articles | Metrics

The basic concept of ＂independent circuit＂ in KVL was defined incorrectly by some authors previously. This paper points out clearly the problem and suggests a more accurate definition. Further, with ＂independent circuit＂ defined in the new way, the paper proves the independence of Kirchhoffs equations and the uniqueness of solutions to those equations by using some methods of linear algebra, geometry and topology.