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Table of Content
20 March 2010 Volume 29 Issue 3
著者文摘
Investigation on the phenomenon of self-excited vibration by dry friction
. 2010, 29(3): 1-1.
Abstract
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768
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732
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The phenomena of self-excited vibration by dry friction is studied and the analytic expression is obtained. So its vibration curve and phase plot show the physical causes of a string-bow musical instrument sending out sweet tone.
Quantum-classical correspondence for a charge in a uniform magnetic field
. 2010, 29(3): 7-7.
Abstract
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599
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(260KB) (
299
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The motion of a charged particle in a uniform magnetic field forms a helical curve. In the plane perpendicular to the magnetic field, the orbit is a circular. In quantum mechanics, the operator form of the classical circle relations by gauge transformation is derived.
Relationship between the coordinate representation and discretional mechanical parameter representation
. 2010, 29(3): 9-9.
Abstract
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899
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(273KB) (
474
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By discuss parameter representation, ing the relationship between the coordinate representation and the discretional mechanical this paper analyses the origin of the δ function normalization of eigenfunction with continuous eigenvalue. A conclusion is obtained that the eigenfunction of coordinate in the discretional mechanical parameter representation and the eigenfunction of discretional mechanical parameter in the coordinate representation are conjugated complex number of each other. Using this conclusion we give a new physical explanation of the eigenfunction closure.
A simple method for solving nonlinear Schrodinger equation
. 2010, 29(3): 12-12.
Abstract
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1255
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533
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By introducing transformation and selecting appropriate trial functions, the nonlinear partial differential equation that is hard to be solved by the usual way is reduced to a set of algebraic equations, which can be easily solved, and their related coefficients can be easily determined by the undetermined coefficient method. Finally, the analytical solutions to nonlinear Schrodinger equation are successfully derived.
Tow kinds of the Hermite polynomials
. 2010, 29(3): 14-14.
Abstract
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2464
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2281
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The arguments about the Hermite polynomials are analysed. Two kinds of the Hermite polynomials, usually adopted in physics and probability respectively, are presented in some details.
Study of the motion of a spring-pendulum
. 2010, 29(3): 16-16.
Abstract
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1108
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1583
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This article simulates the movement of the spring simple pendulum by the starting value with various recursion methods, and the direction of motion of the pellet is divided into transverse direction and radial direction. The increasing of the initial angle can affect the rule of periodic motion in radial direction, and the change of the stiffness coefficient can affect the rule of periodic motion in transverse direction, hut the great stiffness coefficient also can affect the scope of periodic vibration in radial direction, so the pellet will make the periodic sine change movement in transverse direction and radial direction by choosing the small angle and the appropriate stiffness coef- ficient, and coupling influence of the movement of the pellet is very little in two directions.
A simple derivation of thin wire arrays with negative effective permittivity
. 2010, 29(3): 21-21.
Abstract
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771
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(260KB) (
444
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According to the equivalent circuit model of the periodic arrays of thin wire structure, the expression of effective permittivity is derived from the constitutive parameters of dielectric material. In the given electromagnetic wave band, the effective permittivity of thin wire arrays is illustrated to be negative in the relationship between the phase of the electric field intensity and the electric polarization field intensity.
The electric field of a linear charge and a dielectric cylinder
. 2010, 29(3): 23-23.
Abstract
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680
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(517KB) (
423
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On the base of electrical image process to a dielectric cylinder, the electric field of both a line charge and a dielectric cylinder is calculated, and the distributions of electric potential and field intensity are obtained. Both the equipotential line and electric field line map are plotted by mathematical software ＂MATLAB＂
The electric potential distribution of linear charge density and dielectric cylindric system
. 2010, 29(3): 29-29.
Abstract
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916
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(311KB) (
833
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The electric potentials of linear charge density and dielectric cylindric system are calculated by using various methods and some useful conclusions are presented.
A Green function approach to the Casimir effect
. 2010, 29(3): 33-33.
Abstract
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1050
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(255KB) (
496
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The Green function expression of the Casimir energy is introduced. The Casimir energy between two parallel plates with four kinds of boundary condition is calculated by using this method.
Analysis on the measurement of the surface tension coefficient for the liquid with electronic balance
. 2010, 29(3): 35-35.
Abstract
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738
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(360KB) (
542
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A method for measuring the surface tension coefficient with electronic balance by drawing metal loop off liquid level is introduced and the cause for drift of the balance index is explained. A model for the liquid film is built in order to analyze measurement results and compare with theoretical value. Then a formula and corresponding attention are clarified.
The improves and application of voltmeter in experiment of characteristic of volt-ampere
. 2010, 29(3): 38-38.
Abstract
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793
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PDF
(258KB) (
317
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The front-panel design of traditional voltmeter is improved and thus the voltmeter watch is made,which is able to not only measure the electric voltage, but also the current of oneself. In the experiment of characteristic of volt-ampere, the new voltmeter can be used in spite of electric resistance, all adopt the ammeher circumscribes. The voltmeter can be used to measure current of oneself, so that the voltage and current accurately of the electronic device can be measured.
An experimental study of light beam deflection angle based on acousto-optic effect
. 2010, 29(3): 40-40.
Abstract
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673
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(380KB) (
492
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A series of experimental studies to the light beam deflection angle based on acousto-optic effect are presented. Based on the tradition acousto-optic effect＇ s basic principle, we establish the light beam deflection angle theoretical model and carry on the related computation. Our result through the massive Bragg diffraction experiment shows that where is a difference for the size of surveys light beam deflection angle and the theoretical value.
Practical study on the course of new concept quantum physics
. 2010, 29(3): 44-44.
Abstract
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630
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(673KB) (
792
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Based on the learning idea of penetrative teaching and spiral developing, the traditional atomic physics course is converted into the new concept quantum physics, which is connected with the following course of quantum mechanics. According to the response of students of this practice, the new course is beneficial to promote students＇ studying interest on quantum physics, and to strengthen the understanding to the basic theory of quantum physics. The new course has good suitability to most students.
Realization the exploratory learning of using hands and brain by designing and producing of demonstrative experimental apparatus in college physics course
. 2010, 29(3): 50-50.
Abstract
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638
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(458KB) (
444
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A teaching reform of college physics through designing and producing of demonstrative experimental apparatus is introduced, in which students use their hands and brain and learn in the explorations. The processes and the results of this new learning method are illustrated, a chance which allows student to choose his own problems, thus a platform on which students explored knowledge is provided.
Relativistic motion of charged particle in the （E2 〉H2 ） uniform orthogonal electromagnetic field
. 2010, 29(3): 53-53.
Abstract
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791
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(524KB) (
343
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The motion of a charged relativistic particle in the （E2 〉H2） uniform orthogonal electromagnetic field is studied by solving the equation of motion in a special frame in which the field becomes purely electric, and then transforming the solution under a Lorentz boost. The three-dimensional vector expression of the particle＇ s relativistic motion is obtained and the corresponding trajectories in Cartesian coordinate are graphed by using software Mathematlea
The construction of optical tweezers and observation of optical trap effect
. 2010, 29(3): 59-59.
Abstract
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855
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(455KB) (
595
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Optical tweezers was invented by an American scientist Arthur Ashkin in 1986. It is mainly used to manipulate micro-particles and used as a transducer of tiny force. As the technique of optical tweezers develops, it makes large contribution to the research of the manipulation of biological macromolecules and the mechanism in the vital process of macromolecules. The working principle of optical tweezers is introduced in this article, and the process of constructing a low cost optical tweezers system with the present apparatus in our lab is present here. We also observe the capture of several kinds of particles. And it turns out that the optical tweezers has an efficient range and the capability of trap decreases when the size of the particle increases.
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