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Table of Content
20 July 2010 Volume 29 Issue 7
著者文摘
Field electron emission from two-to three-dimensional space：an instance of electrodynamic and quantum-mechanical interdisciplinary study
. 2010, 29(7): 1-1.
Abstract
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774
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354
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Electrons of a metallic nano-sheet tunneling into vacuum via the electric field is studied. Ignoring the thickness of the sheet, the boundary surfaces of the cathode and anode are mapped into two planes respectively through a conformal transformation, thereby, the electrostatic potential barrier is obtained rigorously and the Schroedinger equation is solved analytically. Analytical expressions for the electron wavefunction and the emission current density are given.
Classical theory of the inverse Faraday effect in metals
. 2010, 29(7): 4-4.
Abstract
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1034
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488
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Classical dynamics of an electron driven by a circularly polarized light beam and classical micromechanism of the inverse Faraday effect （IFE） in metals are studied. The orbit of the electron is a solenoid. Neglecting the effect of the magnetic field in the light beam, the electron moves along a helix of elliptic cross section, with axis parallel to its initial velocity. The motion of the electron generates a magnetic monent which sign is decided by the chirality of circularly polarized light. For a free electron gas with isotropic distribution in the velocity,the average of magnetic moments per unit volume yields a stationary magnetization identical to that given by Hertel.
The basic theoretical formalism of anyon in quantum mechanics
. 2010, 29(7): 7-7.
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737
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448
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The concept of anyons is introduced through discussing the origin of the exchange symmetry of wave functions and the commutation relations of field operators. Moreover, a rigorous proof of the commutation relations of one-dimensional anyonic field operators is presented in detail. The content of this paper is a helpful supplement to the common teaching course of quantum mechanics.
A process of ejection treated under four frames of reference
. 2010, 29(7): 10-10.
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618
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336
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A process of ejection is analyzed under four frames of reference.
The electric field distribution in the central axis line generated by an elliptic ring uniformly charged
. 2010, 29(7): 12-12.
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721
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390
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Using the superposition principle of the electric field and the methods of theory of elliptic integrals and the mathematic trick, we obtain the electric field distribution in the central axis line generated by an elliptic ring uniformly charged and we make the discussion about it. The important properties of the electric field distribution in the central axis line generated by an elliptic ring uniformly charged are shown.
Inductance coefficient of finite and multi-layer straight solenoid
. 2010, 29(7): 16-16.
Abstract
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1047
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574
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By using φ=∫sB·dS=∮tA·dt,we discuss the self-inductance of single coil, mutual inductance of two coils and general form of practical solenoid. The results of inductance coefficient of finite and multi-layer straight solenoid can be rapidly evaluated by using the MATLAB.
Space-time interval keeping invariant in all inertial coordinate systems and Lorentz transformation
. 2010, 29(7): 22-22.
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1042
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402
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In the framework of special relativity, it is first proved that the space-time transformation between two inertial coordinate systems is surely linear if the space-time interval keeps invariant in all inertial coordinate systems. It is demonstrated that this space-time transformation is unique yet; it is finally justified that the unique space-time transformation is certainly Lorentz transformation. Therefore, the Lorentz transformation can he established according to the condition of that space-time interval keeping invariant. In the last part of this paper, it is proved that the condition of that space-time interval keeping invariant is the most basic condition of establishing Lorentz transformation, there are not any conditions which can establish Lorentz transformation as well as.
Application of IEO method to solving energy spectrum of hamiltonian
. 2010, 29(7): 25-25.
Abstract
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799
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264
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By introducing the IEO method and selecting the appropriate invariant eigenoperator, we obtain an invariant eigenoperator function, from which we can derive the corresponding eigenvalue, which is related with the energy level gap of the interesting Hamihonian. Thus we derive the spectrums of this system directly and conveniently. In order to test the present method, we take two examples for a diatomic molecules system with extra field and an optical nonlinear interaction Hamiltonian, and then obtain their corresponding energy level gaps.
Study of the influence of the transverse relaxation time on the NMR signal
. 2010, 29(7): 28-28.
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1199
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588
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In this paper, we employe a set of CuSiO4 solutions with different concentrations to study the influence of the transverse relaxation time on the NMR signal. When the transverse relaxation time of these samples is much longer than the period of the scanning magnetic field, the dephasing of the micro-magnetic moment is found to be the main factor which resuhes in the decreasing of the NMR signal. In this case, the periodical oscillating NMR singals can be observed both before and after the resonance.
An attempt of using ANSYS on electromagnetic field undergraduate teaching
. 2010, 29(7): 32-32.
Abstract
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724
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562
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The prospects and possibilities of the application of ANSYS-based finite element numerical calculation to electromagnetic field undergraduate teaching are discussed, and some teaching examples are elaborated.
The GUI calculation of perturbative matrix elements of the Stark effect of the hydrogen atom
. 2010, 29(7): 36-36.
Abstract
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920
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(370KB) (
293
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The perturbative matrix elements of the Stark effect of hydrogen atom are calculated by the Matlab program. Input the quantum numbers n,l,m, the result can be get immediately.
Study of stereoscopic and creative optics curriculum teaching system and mode
. 2010, 29(7): 40-40.
Abstract
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592
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(356KB) (
254
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With the focus on cultivating advanced creative talents, this paper presents several measures on reforming optics curriculum. These measure include careful selection of course teaching content, utilization of modern teaching means, reform of evaluation mode, etc. By taking these measures, we demonstrate that satisfying teaching effects can be achieved.
Exploration and practice of solid state physics teaching reform
. 2010, 29(7): 43-43.
Abstract
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769
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1071
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According to the solid state physics curriculum having the characteristics of strong theory and rapid development and combining with the author＇ experience in teaching solid state physics for years, this article explores the teaching content, teaching methods and teaching difficulties of solid state physics curriculum. The good teaching effects have been obtained through more than ten years of teaching practice for students majoring in applied physics, which provided new ideas and methods to improve the teaching quality of solid physics course.
Exploration of bilingual teaching methods in engineering physics
. 2010, 29(7): 46-46.
Abstract
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602
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(447KB) (
482
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The suitable bilingual education mode has been proposed based on theoretical analysis and practical exploration. Traditional teaching methods should be improved and diversify, the specific teaching methods and approaches in physics bilingual lecture have been given.
Review of physics education research in America
. 2010, 29(7): 49-49.
Abstract
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897
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623
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The overview of physics education research （PER） in America is introduced in this paper. The research contents of PER include the theories and methods of physics education. The research objects are the aspects and the relations of physics teaching. Researchers advance many new methods and modes to improve the teaching quality, find the difficulties and the problems in learning physics courses, encourage students＇ enthusiasm, deepen their understandings, and make progress their abilities to analyze and solve scientific questions.
Discussion on two ways of statements about the correspondence principle
. 2010, 29(7): 53-53.
Abstract
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872
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(171KB) (
301
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Some different opinions and new ideas are presented in this article in terms of some viewpoints presented in a previous published article in the 《 College Physics》, which talks about the two ways of statements of the correspondence principle and the integrated using of the two statements. And some understandings about the Planck＇s and Bohr＇s correspondence principle are also elaborated.
Research on the electrical transport properties of manganite thin film under γ ray irradiation by using a real-time measurement system based on LabVIEW
. 2010, 29(7): 55-55.
Abstract
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594
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(397KB) (
228
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The electrical transport properties of La0.67 Ca0.33 MnO3 film under γ ray irradiation is studied by using a real-time measurement system based on LabVIEW program. It reveals some interesting phenomena： when the film is irradiated by gamma-ray, its resistance decreases at the begimfing but then increases obviously under the continuously long-time irradiation. For comparison, the influence of 3, ray irradiation on the resistance of 1 wt% Nb doped NSTO is also measured, which shows no distinct change as that in LCMO. A phenomenologieal explanation for the conductive behavior of LCMO films is proposed by taking into account the strongly electronic correlation feature and the irradiation damage mechanism in LCMO.
Discovery of energy quantum
. 2010, 29(7): 59-59.
Abstract
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628
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561
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In order to promote the creative ability of college students, we rebuild the discovery process of energy quantum in the history of physics in this paper.
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