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Table of Content
20 December 2008 Volume 27 Issue 12
著者文摘
Thermodynamic stability and single-particle distribution function in quantum system at zero temperature
. 2008, 27(12): 1-1.
Abstract
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835
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432
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By exploiting the stability of quantum dot system and applying the variational principle, we prove that its single-particle distribution function is non-increasing with respect to the energy levels at zero temperature. Our result shows that the properties of the spectral functions in a quantum many-body system is largely determined by its thermodynamic stability.
Study on Fresnel diffraction fields by a circular cosine-grating
. 2008, 27(12): 5-5.
Abstract
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864
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(357KB) (
659
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Based on the method of wavefront phase- factors and considering of the influence of limited aperture of grating, we analyze the diffraction fields by a circular cosine-grating which contain three components, i. e. , the plane diffraction wave, the divergence spherical diffraction wave and the convergence spherical diffraction wave, they are all limited by the circular aperture. The corresponding three integral expressions of the diffraction fields are given. Three formulae of the amplitude distribution of diffraction fields along axis are obtained and corresponding a series of curves are shown. Finally the transverse line-width and the axial line-width of that real focal-spot are obtained. This study may further provide a theoretical foundation to analyze the technique of the diffraction focalization and image formation by a circular cosine-grating.
Another calculation for the Casimir effect
. 2008, 27(12): 9-9.
Abstract
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734
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388
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Using Poisson＇ s summation formula and a simple regularization procedure, we preseut another calculation for the Casimir effect
Evolution and revival of the plane rotor＇ s Rydberg wave packet in the external electric field
. 2008, 27(12): 11-11.
Abstract
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787
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(319KB) (
346
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The use of Rydberg wave packet analyzing the dynamics of quantum mechanical systems is a very important method for studying the relations between the classical mechanics and the quantum mechanics. The evolution and revival structure of the plane rotor＇ s Rydberg wave packet in an external electric field is studied mainly in the present paper. The results show that the wave packet might be collapsed or resumed periodically if the external electric field is very weak, but in the strong electric field, the evolution and revival structure of the plane rotor＇ s Rydberg wave packet are in correspondence with that of the harmonic oscillator.
Solutions of solitary wave and Jacobi elliptic function for weak dispersion nonlinear transmissions lines wave equation
. 2008, 27(12): 15-15.
Abstract
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759
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(232KB) (
549
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Both the transmissions lines wave solitary wave solution and Jacobi equation are investigated by using elliptic function solution the mapping method. The in weak results dispersion nonlinear are illuminated based on the Matlab plotting.
Thanking induced by ＂Chang E number one＂
. 2008, 27(12): 18-18.
Abstract
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789
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(249KB) (
839
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A What is the simpl the circle and elli problem is considered from changing trajectories of several times of ＂Chang E number one＂. est expression of determining the period of ellipse motion？ A summary for the general formulae of pse motions is proposed. This is useful to the undergraduates having learned the general physics.
The range of projectile with air friction
. 2008, 27(12): 21-21.
Abstract
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1721
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1236
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Air friction has a notable effect on the motion of projectile. The formulae of time and range of projectile with the projecting angle taking account into air friction are obtained by using the approximate method to solve the equation. A comparison between the formulae and the numerical results is presented.
Integrated form of K selection rule in γ-transition
. 2008, 27(12): 23-23.
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1114
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1153
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The K-forbiddance and the elimination is discussed from the γ-transition probability, the rotation spectrum and the Coriolis coupling term of nucleus. The region of ΔK value and mathematical form of the integrated K selection rule in the γ-transition are presented, which manifest accurately intrinsic implication of the K selection rule.
The electric field of linear charges between parallel ground connection conductor plate
. 2008, 27(12): 26-26.
Abstract
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869
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(244KB) (
719
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The distributions of electric potential and field intensity of linear charges between two parallel ground connection conductor boards are calculated by using the conformal mapping on the complex coordinate system.
Application of CCD to measuring Young＇s modulus of materials
. 2008, 27(12): 29-29.
Abstract
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943
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(273KB) (
360
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There exits a large error in the traditional method by stretching for measuring Young＇ s modulus of metal, with difficulty in adjustment and worse stability. In this article, a new advanced method is implemented, and it provides better precision based on the mathematical model, which is acquired according to the digital data of laser signal from the linear array CCD and A/D. The application of new method extends the experimental knowledge, which makes the traditional experiment more vividly and abundantly and improves the students＇ learning ability.
Harmonic analysis on attenuation coefficient in transient process of RLC series circuit
. 2008, 27(12): 32-32.
Abstract
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1210
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(341KB) (
951
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The reason of difference between theoretical attenuation coefficient and experimental one is analyzed. The damped oscillation wave is expressed to harmonics in the Fourier series, the loss resistance of inductor and capacitor are measured when the first harmonic and the harmonics which replacing the damped oscillation wave are applied to the RLC series circuit. The theoretical value of attenuation coefficient is amended,so as to the agreement between the amended theoretical value of attenuation coefficient and the experimental one can be obtained.
Analysis on the influencing factor of stable flat measuring method for thermal conductivity measurement
. 2008, 27(12): 35-35.
Abstract
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1647
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(498KB) (
1813
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The main factors that affect the veracity of steady-state method measuring thermal conductivity are heat resource temperature, ambient temperature, sample thickness and sample thermal conductivity. The cooling rate of cooling plate is different on upper surface and below surface is another important factor. The natural convection empirical formula is used to improve the data processing, the effect of elimination of heat from the side of sample is reduced. It is important to design the experiment to keep the temperature of cooling plate in an appropriate range, and the cooling rate of cooling plate is uniform anywhere at such temperature.
Theoretical and experimental investigations of a single iron ball stable levitation under permanent magnet field
. 2008, 27(12): 40-40.
Abstract
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752
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PDF
(378KB) (
543
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An iron ball suspending in a cylindrical permanent magnet is realized by modifying the magnetic field distribution with iron balls array. We use the solenoid model and the interaction of levitate iron ball and permanent magnet and the magnetize iron balls array to calculate the three-dimensional distribution of the permanent magnet. The energy minimum indeed existing in the energy carve drawn is presented numerically by the MatLab software in this magnetization system, which makes sure the iron ball to suspend in midair stably. Based on this foundation we do the experimental study and the experimental result is in agreement with the theoretical calculation. This may be applied in magnetic levitation fields in the room temperature.
A simple and convenient method of diffuse reflection holography
. 2008, 27(12): 44-44.
Abstract
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1020
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(199KB) (
551
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An optimized method of holography is presented, in which only a piece of ground glass is used in the experiment. It is shown that the optical path is simple and the effect is very good.
Birth of quantum mechanics seeing from Born＇ s teaching quomodo
. 2008, 27(12): 46-46.
Abstract
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801
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(523KB) (
1273
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As the leader of the Gottingen school, Born achieved fruitful results of physics in the 20th century. Born was also an outstanding professor of physics, he had trained many great physicists, mathematicians and biologists. Quantum mechanics was founded in the 20th century in Germany, which was closely related with the fact that Born put so much energy in cultivating students and leading them into the active exploration on forefront of physics. Through this analysis, we can see the problems in physics education in China.
The effect of atmospheric electric field on plant and agriculture
. 2008, 27(12): 50-50.
Abstract
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907
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(308KB) (
1207
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The physical parameters of atmospheric electric field and its mechanism are introduced. The effects of atmospheric electric field on plant and agriculture are discussed
Discussion on the innovate of physical experimental teaching system for non-physics-major students in normal universities
. 2008, 27(12): 53-53.
Abstract
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600
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(412KB) (
666
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The problems of physical experimental teaching of non-physics-major is analyzed. By recombining experimental project with different specialties, optimizing teaching contents, reforming teaching methods and completing evaluation systems, we construct an open-half and level-based physical experimental teaching system which concludes basic skill, specialty application, synthesis application and innovating elevation. This is propitious to in- crease practical abilities and scientific thought means of non-physics-major students in normal universities.
Effective combination between college physics teaching and modern astrophysics
. 2008, 27(12): 57-57.
Abstract
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995
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(306KB) (
871
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2009, the international astronomical year. It is the vital mission of the college physics teachers that college physics teaching needs combine with the modern astrophysics knowledge. Four examples, such as the second cosmic velocity and gravitational radius of black hole, the law of conservation of angular momentum and pulsars, the magnetic flux and neutron star with strong magnetic field, the magnetic energy density and magnetar are presented. This can increase many interests of students in learning college physics.
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