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Table of Content
20 December 2007 Volume 26 Issue 12
著者文摘
The method of wavefront phase-factors and its applications
. 2007, 26(12): 1-1.
Abstract
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819
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1064
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A novel way called the method of wavefront phase-factors to analyse diffraction fields is proposed, and by means of applied practicalities the operation processes and the advantages are clearly shown, finally a review of physical thought and resolving ability of this method are given.
Peculiar properties of paraxial imaging at single spherical surfaces made of negative refractive index materials
. 2007, 26(12): 8-8.
Abstract
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741
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(378KB) (
720
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The imaging properties of single spherical surface made of negative refractive index （n＇〈 0） materials （NRIM） under the paraxial approximation are investigated. Theoretical derivations confirmed that the paraxial imaging at single spherical surface made of NRIM and conventional materials have the same expressions. However, the analyzed results, due to the refractive index n＇〈 O, indicate that the imaging characteristic of NRIM is completely different from that of conventional materials. It is easy to discuss the imaging properties,such as the location of object and image, the erected and the inverted, virtual and real properties of image, and the scaling rule, through the s＇-s curves. The comparison of s＇-s curves between different materials are given, also the graphs of the relationship between object and image in the whole space of n＇〈0,f＇〉0,f〉0 as well.
Quantum invariant treatment of a time-dependent damped harmonic oscillator
. 2007, 26(12): 12-12.
Abstract
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645
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(285KB) (
541
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Using the canonical transformation and Lewis and Riesenfeld quantum invariant theory, the excat wave function of a harmonic oscillator with time-dependent coefficient of damping is obtained. The exactitude and universallity of wave function are discussed also.
On the coefficient of absolute restitution
. 2007, 26(12): 16-16.
Abstract
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629
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(146KB) (
506
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Some authors defined a concept about coefficient of restitution： coefficient of absolute restitution. A query on the concept is raised.
The shock solution of damped simple pendulum
. 2007, 26(12): 18-18.
Abstract
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605
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(218KB) (
619
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Studying the equation of motion of damped simple pendulum, the shock wave solution is found. The physical meaning of this solution is analyzed using the phase diagram of the pendulum.
A remark on the potential energy in the analytical mechanics
. 2007, 26(12): 20-20.
Abstract
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744
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(153KB) (
446
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A shortcoming in the relationship between the potential energy and force in the analytical mechanics textbook is pointed out, and its origin is discussed.
Damped oscillation of A2B model
. 2007, 26(12): 22-22.
Abstract
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580
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(276KB) (
695
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Using software MATLAB, the solution of damped vibration of A2B model is solved; the damped oscillation pattern is discussed.
Discussion on designation of energy levels for Tm^3＋ ions
. 2007, 26(12): 26-26.
Abstract
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1116
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988
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Research on Tm^3＋-doped lasers has attracted many interests since the Tm^3＋ ions have plenty energy levels. The author noticed that the literature is largely confused concerning the designation of energy levels for Tm^3＋ ions. The reason for this confusion is presented firstly by illustrating some examples, and then the spectral terms of equivalent electrons＇system in L -S coupling are calculated for Tm^3＋ ions. At last, a suggestion is given that consistency of atomic states for Tm^3＋ ions should be hold.
The experimenal test of equivalence principle
. 2007, 26(12): 29-29.
Abstract
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698
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(316KB) (
541
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The theoretical background of equivalence principle is briefly given, and the experimental tests of the equivalence principle is discussed in detail, via free-fall method and torsion balance.
Measurement of the wave-length of Compton scattering using X-ray diffraction apparatus
. 2007, 26(12): 32-32.
Abstract
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762
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(305KB) (
363
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Experimental methods and results of measuring wave-length of Compton scattering by powder X -ray diffraction apparatus are described in detail.
Attempt at teaching reform of opening and grading physics experiment
. 2007, 26(12): 36-36.
Abstract
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594
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(425KB) (
759
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A new physics experiment mode of ＂six grades at three levels＂ is suggested by employing the opening experiment mode gradually, and the different instructing methods for different grades, we try to meet the various needs from different students, improve their ability to conduct experiment, and cultivate their personality.
A teaching method focusing on knowledge, ability and innovative thinking education
. 2007, 26(12): 41-41.
Abstract
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687
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(166KB) (
344
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It is introduced how to complete the education of knowledge, ability and innovative thinking for the students based on the model of digital teaching in the universities. Knowledge, ability and innovative thinking are three important indicators that scale the quality of teaching.
A calculation of time of a planet in an elliptical orbit around the sun
. 2007, 26(12): 43-43.
Abstract
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837
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(132KB) (
457
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By analyzing the movement of a planet in an elliptical orbit around the sun, the time between any two points and period are obtained.
A quantitative analysis for a classical problem of the static electricity
. 2007, 26(12): 45-45.
Abstract
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789
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(379KB) (
449
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A classical problem of static electricity is analysed quantitively the function of motion of the water drop is obtained by the use of MATLAB and an experiment is designed to validate the result.
Study on TN-LCD＇s electro-optic characteristic ＆ response times
. 2007, 26(12): 48-48.
Abstract
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715
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(385KB) (
389
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Based on the experimental result of the electro-optic property of twsited nematic liquid crystal （TN-LC）, a deeper study of the TN-LC electro-optic response times is carried out. And a new method to approach the critical driving voltage is introduced by understanding the response times under different driving voltages.
Measurement of gravitation constant by laser interference
. 2007, 26(12): 53-53.
Abstract
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644
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PDF
(355KB) (
318
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Based on traditional torsion balance gravitation constant G is mesured and laser interference is used measure deflect angle. To eliminate environment effect, magnetic field is used.
Quantum mechanical discussion of the classical conservation laws
. 2007, 26(12): 57-57.
Abstract
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1094
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(211KB) (
568
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The classical law of momentum conservation and energy conservation are deduced from the point of view of Quantum mechanics. And the conditions that the classical conservation laws can be used in microscopic area are also discussed.
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