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Table of Content
20 November 2011 Volume 30 Issue 11
著者文摘
Focusing on sketch map and analysis of resulting figure
. 2011, 30(11): 1-1.
Abstract
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651
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PDF
(363KB) (
444
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The roles of sketch maps and resulting figures on physics education are introduced. The course of thermodynamics and statistical physics is regarded as an example, we modify several faulty figures in the present textbooks. The dimensionless, scale and region of parameters are discussed. It is necessary for students to plot the figures of theoretical and numerical results, and then the change law of resulting curves should be analyzed.
Derivation of wave functions of particle number state by using Hermite polynomial operator
. 2011, 30(11): 5-5.
Abstract
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1381
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(161KB) (
425
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By introducing the Hermite polynomial operator and deriving its normally ordered expansion, we derive the wave functions of particle number state in the coordinate representation and momentum representation, respectively, which can directly lead to the Fock representation of coordinate and momentum eigenstate. Our way is brand-new and concise.
Exact wave function of the three-body coupled pendulum quantnm system
. 2011, 30(11): 7-7.
Abstract
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935
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(323KB) (
541
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The normal frequencies and its corresponding normal coordinates and conjugate momentums for a three-body coupled pendulum quantum system is derived in terms of the invariant eigen-operator method. With Hamiltonian of the system decoupled, the visible analytic solutions of normal frequencies in the system are obtained. The analytic solutions of exact wave function of the system in coordinate representation are deduced. Whereas, when calculating the Hamiltonian containing mechanical quantity with invariant eigen-operator method, the three power and more than three power terms of system Hamihonian are very intricacy.
Numerical simulation of the laser formation and self-reproducing in optical oscillator
. 2011, 30(11): 10-10.
Abstract
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1062
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(355KB) (
743
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The applications of numerical simulation in ＂the principle of lasers＂ are discussed. The progress from pumping, relaxation oscillation, gain saturation to steady output of the three-level system lasers is posted by numerical solution of the rate equations based on ruby lasers. The procession of self-reproducing mode formation is demonstrated based on diffraction theory and Fox-Li iterative method. Numerical simulation makes abstract theoretical equations to be concrete, which helps students understand basic concept and increases the ability of solving practice problem for the students.
Research on the shape of a bleb floating on surface
. 2011, 30(11): 14-14.
Abstract
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719
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PDF
(258KB) (
489
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It is proved that the shape of a bleb floating on surface is half-spherical from the principle of minimum potential energy
The electric capacities of several special equivalent coordinate capacitors
. 2011, 30(11): 16-16.
Abstract
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829
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(238KB) (
479
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Based on the meaning of differential element capacity, the electric capacities of several special equivalent coordinate capacitors are obtained by the method of equivalent coordinate.
Study of the diagonal equivalent resistance of 3×n network
. 2011, 30(11): 18-18.
Abstract
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848
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PDF
(327KB) (
639
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In view of the importance of the resistor network model and the 3×n-step resistor network is still not fully resolved, this paper discusses the equivalent resistor of 3×n-step diagonal resistor network. By establishing the network＇s differential equations model in terms of network analysis, we resolve this differential equations through matrix transformation. Depending on the boundary conditions, a beautiful, general formula for the diagonal resistance of 3×n-step diagonal resistor network is proposed.
Symmetrical transformation for two-dimensional apertures and intensity distribution of the Fraunhofer diffraction
. 2011, 30(11): 22-22.
Abstract
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838
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PDF
(822KB) (
985
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The symmetrical transformation of the Fraunhofer diffraction for two-dimensional aperture is discussed by using superposition of the complex amplitude. For apertures with certain shape, symmetrical transformation of the Fraunhofer diffraction amplitude is introduced to derive the intensity distributions of diffraction from known results. The intensity distributions of diffraction patterns are also simulated by using Mathematica soft.
Research on detection method of optical rotation measurement for small angle
. 2011, 30(11): 28-28.
Abstract
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746
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PDF
(367KB) (
318
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A detection method of optical rotation measurement for small angle is proposed by the analysis of output signals. Two kinds of light signals are detected in the experiment. One is detected, after it is sent through the optically active solution and modulated by Faraday coil. The other is just modulated by Faraday coil. By measuring the width of the waveform of these signals, the optical rotation can be obtained. Meanwhile, based on the already built system, sugar solutions with different concentrations are prepared for measurement. The experimental results show that there is a good linear relation between the solution concentration and the optical rotation. The goodness for linear fitting is up to 0. 998. The resolving capability of optical rotation can reach 0.01 degree.
Estimate the band gap of InSb by temperature dependent Hall effect
. 2011, 30(11): 32-32.
Abstract
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1534
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PDF
(349KB) (
1135
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In this paper, we obtain data about the Hall voltage of InSb changing with temperature. According to the relationship of the Hall coefficient of semiconductor and temperature, we calculate the band gap by using two methods, and compare the difference between the two methods for calculating the band gap.
Design and measurement of high frequency signal of compact disk recordable in physics experiment
. 2011, 30(11): 35-35.
Abstract
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732
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PDF
(385KB) (
409
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By using the old CD driver and electronic technologies, the ＂eye diagram＂ formed by high frequency signal of compact disc is demonstrated on analog oscilloscope. The high frequency signal parameters, such as the highest voltage, normalized voltage I11R,I3R, resolution, symmetry, are measured. The demonstration installation which is accessible and easily manipulated by students shows the knowledge in high and innovative technologies and daily life. It could be used to demonstrate and analyze the characteristic of the optics experiment.
Analysis of quantum chaos teaching
. 2011, 30(11): 38-38.
Abstract
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808
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(713KB) (
891
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The significance of quantum chaos teaching is introduced. It is useful for undergraduates to comprehensively understand quantum theory and bring up their innovations.
Analysis of uncertain prinsiple in quantum mechanics
. 2011, 30(11): 44-44.
Abstract
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1691
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PDF
(640KB) (
1056
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The uncertainty principle, put forward by W. K. Heisenberg in 1927, includes the uncertainty relation between two mechanical quantities and uncertainty relation between energy and time. It makes the quantum mechanics to have an integrated mathematic description and a solid physical base. In this paper, we introduce the background, the process of uncertainty principle presented, and the applied aspect of the uncertainty principle. The important role of the debate in the science developing is stressed.
classroom response system preliminary application in college physics instruction
. 2011, 30(11): 50-50.
Abstract
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726
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PDF
(306KB) (
592
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as a new information technology in education, the classroom response system （Clicker） provides an important platform for the interactive classroom teaching, which could lead students participlate classroom teaching actively and has a positive influence on the attendance rate and achievements of students. By combining related research results at home and abroad, this paper makes a brief research about the application effect of Clicker in college physics instruction. The result has shown that Clicker is helpful to improve the achievements of students, and is more effective to boys than girls.
Calculation for moment of inertia of fractal body
. 2011, 30(11): 53-53.
Abstract
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1086
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(288KB) (
881
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The moment of inertia of fractal triangle, cube, tetrahedron and Koch snowflake are calculated from the self-similarity property of fractal body, the dimension and parallel axis theorem of moment of inertia.
Distribution of electric potential between two charged confocal parabolic conductor plates by parabolic cylindrical coordinates
. 2011, 30(11): 56-56.
Abstract
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680
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PDF
(242KB) (
723
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The distribution of the electric pote charge distributions on the conductors surface are between two charged confocal parabolic conductor plates given by parabolic cylindrical coordinates.
A new measurement of grating constant based on interference
. 2011, 30(11): 58-58.
Abstract
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1153
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PDF
(352KB) (
787
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A new way to measure grating constant is discussed based on phase shift between adjacent diffraction light caused by the transverse movement of the grate, which results in a visible change in their interference effect Also conditions are specified to accomplish the measurement and a brief comparison is given in the end.
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