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Table of Content
20 November 2009 Volume 28 Issue 11
著者文摘
The relation between the surface charge density of a charged ellipsoidal conductor and its principal radii
. 2009, 28(11): 1-1.
Abstract
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1240
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1021
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The relation between the surface charge density of a charged ellipsoidal conductor and its principal radii is obtained
On the quantum mechanical treatment of a RLC mesoscopic circuit
. 2009, 28(11): 3-3.
Abstract
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851
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(303KB) (
378
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Starting from the canonical transformation technique and the method of the Feynman＇ s path integral, we obtain the exact wave function of a RLC mesoscopic circuit. The quantum fluctuations of charge and generalized current are also given.
Alternating iteration method of calculating off-axis electromagnetic field for axial symmetric and non-static charge-current distribution
. 2009, 28(11): 7-7.
Abstract
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786
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(368KB) (
573
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Under the circumstances of axial symmetric and non-static charge-current distribution, we propose an alternating iteration method of calculating off-axis electromagnetic field by using the Maxwell＇ s equations and axial symmetry.
Free vibration of a symmetrical multi-atoms molecule with the atoms in a circle
. 2009, 28(11): 12-12.
Abstract
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832
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(221KB) (
410
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The problem of free vibration for an oscillation system of a multi-atoms molecule is considered. The formula of eigenfrequency and the general solution of free vibrations of the system are given.
Analysis of restrictions in kinetic problems
. 2009, 28(11): 15-15.
Abstract
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882
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(306KB) (
306
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The depiction of restrictions and their applications in solving kinetic problems are discussed through several typical problems
Study on existence of a simultaneous system of eigenfunctions of two operators
. 2009, 28(11): 18-18.
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2088
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(277KB) (
2462
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The quantum mechanics is an important course that one can understand the microcosmic world. Because of wave-particle duality for system with finite rest mass in quantum mechanics and then replaced each of mechanical quantities by its corresponding operator, the operator theory seems to be important particularly. There is an important theorem when we study many operators, namely, the necessary and sufficient condition for the existence of a simultaneous system of eigenfunctions of two operators is that they can commutate each other. These problems are analyzed and cleared when we used the theorem to solve it.
Application status of the fundamental physical constants in textbooks of college physics
. 2009, 28(11): 21-21.
Abstract
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731
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(252KB) (
354
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The fundamental physical constants recommended values and their developments are introduced. The survey is made which shows that most of the college physics textbooks published within recent years had not used the latest fundamental physical constants of the international recommended values.
The ray trace in the （2＋1） dimensional de-Sitter space-time
. 2009, 28(11): 24-24.
Abstract
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716
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(172KB) (
276
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Solving the geodesic equation in （2＋1） dimensional de-Sitter space-time, we obtain the trace equation of ray. Analysing the solution, we find that there is not closed orbit in this space-time.
Analysis of some questions in teaching of Compton effect
. 2009, 28(11): 25-25.
Abstract
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820
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2432
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In order to help students to understand the Compton effect accurately, we analyze some important questions that are misunderstood or ignored
An experimental study on a moving-turning coupled oscillator
. 2009, 28(11): 29-29.
Abstract
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928
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(451KB) (
735
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An experiment of a moving-turning oscillator is introduced. It is shown that a spring-mass oscillator is a system of two modes, and there is coupling between the two modes, the vibration energy will transfer from one mode to the other. The energy can be transferred entirely when their vibrating frequencies are equivalency, i. e. , resonance coupling.
The experimental study of affecting the pitch of ＂watered glass chime bell＂
. 2009, 28(11): 33-33.
Abstract
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1139
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(386KB) (
1401
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The acoustic signals are collected by using miniature microphone and the virtual frequency spectrum instrument based on sound card if the watered glasses with different volume water are struck. The value of pitch is obtained by using the analysis of frequency spectrum picture. The data is fitted using the software Matlab and the conclusion is drawn that the relationship of the different volume water and the pitch. Finally, the effect of different striking points versus the pitch is also studied.
A theoretical explaining for current peak in self-induction experiment
. 2009, 28(11): 36-36.
Abstract
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865
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(176KB) (
424
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The current peak phenomenon is usually shown in the electrifying self-induction experiment, but in the present documents, this phenomenon＇has not been perfectly explained. This paper educes a theoretical explaining based on the electrocircuit essential throughout calculation.
How to control interference light field in bi-prism interference experiment
. 2009, 28(11): 38-38.
Abstract
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936
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(375KB) (
331
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To solve the existing problems in bi-prism interference experiment, the hi-prism sub-wave-front interference principle is analyzed and the bi-prism interference light field is discussed. How to optimize the experi- mental parameters to control the interference light field for the suitable interference fringes to be observed is discussed, so that students can better appreciate the physical ideas and learn the experimental methods. These are helpful to foster the students＇ research capacity and to inspire their innovation sense, and can promote the reform of optics-teaching.
A model for rotating binary stars and its evolution
. 2009, 28(11): 42-42.
Abstract
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915
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(534KB) (
758
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A model for rotating binary stars is presented. The potential of the primary is derived and the gravitational acceleration is simulated. We only consider the first order in the potential of the gravitational potential. The results show that the gravitational acceleration reaches the maximum value at polar region and goes down the minimum value at the top of the longest axis. Moreover, due to the combined effect of the spin and tide, the effective temperature of the two components decreases for some extent. As a result, the life time of the two components is prolonged on their main sequence.
Construction on integrated and study-innovation-featured physics experiments
. 2009, 28(11): 48-48.
Abstract
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774
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(311KB) (
908
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Upon the integrated physics experiments and study-innovation-featured physics experiments, this article exposits understanding of the authors and their more than 10 years practical experience.
Research on collisions of many balls from astroblaster
. 2009, 28(11): 51-51.
Abstract
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955
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(379KB) (
562
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This article focuses on the principle of astroblaster and discusses the relationship between reboun- ding height and relative parameters in terms of separate collision modeling as well as spontaneous collision modeling with the support of theoretical calculation and numerical simulation Firstly, separate collision modeling is applied to analyze how the mass distribution affects the final velocity and rebounding height in the 2-ball, 3-ball and N-ball collision model. The conditions for maximum elevation are concluded for separate collision modeling. Secondly, spontaneous collision modeling is presented. This modeling involves the effect of elasticity on different objects. The change of acceleration of the objects in astroblaster is also mentioned. The conditions for maximum elevation are concluded for spontaneous collision modeling.
Using magneto-optical effect to study the chain aggregation behavior of ferrofluids under an external magnetic field
. 2009, 28(11): 55-55.
Abstract
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795
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(361KB) (
422
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In this paper, we discuss the field-induced inhomogeneity in ferrofluids based on our theoretical analysis and experimental measurement. First, the dielectric tensor of the anisotropic media with particle chain is analyzed by using the electromagnetic theory. Second, based on a microscopic model, we discuss the behavior of the chain aggregation in the ferrofluids under external magnetic fields. Then, we relate the observable quantity-refraction index differences of the two propagating modes to the ratio between chains of different sizes and the strength of magnetic field. Finally, we experimentally measure the magneto-optical effect of ferrofluids by detecting polarization state change of the laser passing through the ferrofluids film, and the ratio between chains of different sizes is obtained by using computer simulation.
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