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Table of Content
20 October 2009 Volume 28 Issue 10
著者文摘
Plane wave motion in elastic solids
. 2009, 28(10): 1-1.
Abstract
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646
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367
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The wave equations of plane wave in elastic solids are derived from Hooke law.
Studies on the vibration modes of a finite periodical string-ball chain
. 2009, 28(10): 4-4.
Abstract
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920
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(464KB) (
334
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The vibration modes of a finite periodical string-ball chain are studied with both experimental and calculation methods. The vibration spectrum of the system appears band structure and the surface states could be observed in band gap. The eigenfrequencies of the surface states are measured and calculated for different distances τ from the start of the chain to the first ball. A brief discussion is given for the observations and calculations.
The Landau energy in two-dimensional ring infinite potential well
. 2009, 28(10): 8-8.
Abstract
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1090
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668
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The motion of a charged particle in the magnetic field is described in many textbooks, however, the charged particle in two-dimensional infinite potential well has been not mentioned yet. In this paper we investigate the energy of charged particle and Landau energy levels with the bound of two-dimensional infinite potential well.
The electric field of a linear charged and a grounding right angle conductor
. 2009, 28(10): 11-11.
Abstract
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851
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422
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The electric field of a linear charggd and a grounding right angle conductor is calculated by using the conformal mapping on the coordinate system of the complex number, and its electric potential distribution and electric field intensity distribution are obtained. The electric potential maps are plotted by using the software MATLAB.
The classical characteristics of the movement of one-dimensional quantum harmonic oscillator
. 2009, 28(10): 14-14.
Abstract
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1120
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1039
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With the help of principle of superposition in quantum mechanics and the operator splitting method, we study the movement of the center position of the initial Gaussian wave packet in one-dimensional harmonic oscillator potential. The results show that its quantum evolution performs characteristics of a classical harmonic oscillator; the initial location and the initial momentum of the wave packet play a similar role as the classical oscillator. Our results should be helpful to understand the Gaussian wave packet method, which is commonly applied in the research on complex quantum system.
Investigation on some particular problems in college physics teaching
. 2009, 28(10): 17-17.
Abstract
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763
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(261KB) (
616
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Several teaching problems in college physics course are discussed.
Preparation of Schrodinger cat states in a cavity with a moving mirror
. 2009, 28(10): 20-20.
Abstract
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744
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(344KB) (
354
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For a system composed of a cavity with a movable mirror （treated as a quantum harmonic oscillator with frequency ωm） and a single mode field in the cavity, the time evolution operator of the system is given, which is obtained by means of full quantum theory in the Schrodinger picture. The result shows that the state of the cavity field at the moment can give a variety of muhicomponent Schrodinger cat states when the mirror returns to its original state, which are different from those in the published literature, and the desired Schrodinger cat state can be chosen by adjusting the frequency of the single mode cavity field.
Recognition on time dilation and length contraction on relativity of simultaneity
. 2009, 28(10): 24-24.
Abstract
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1232
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1179
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Relativity of simultaneity, time dilation and length contraction effect are among the main conclusions of special relativity. In the light of the fact that simultaneity is the foundation of space-time survey, we have explained our recognition on the time dilation and length contraction in more detail on the basis of relativity of simultaneity in this paper. The time dilation effect is a general reflex of the slow tempo of the mobile clock and different clock calibration in different inertial reference frame, and the essence is the direct reflection of relativity of simuh aneity for time-measurement ; while the essence of length contraction is the reflection of relativity of simultaneity for space-measurement, as well as the different spatio-temporal description of the same objective fact by observers in different inertial reference frame.
Significant figure and the calculator
. 2009, 28(10): 28-28.
Abstract
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1397
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640
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Significant figure in numerical calculation is illustrated and the general features of the calculator are given.
Fresnel diffraction by a circular aperture
. 2009, 28(10): 31-31.
Abstract
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1084
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1268
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An analytic expression in terms of Bessel＇ s functions or Lommel＇ s functions of two variables, is obtained for the intensity distribution of the Fresnel diffraction by a circular aperture. The Fresnel pattern in any transverse plane at an axial distance from the aperture is then easily computable using commonly available software packages. Comparison with Burch＇s theoretical results（in 1985） is made and satisfactory agreement with experiment is found. The light intensity patterns are recorded by the use of CCD camera, which may be adapted as a student experiment in universities.
Experimental design and study of the osmosis phenomenon
. 2009, 28(10): 35-35.
Abstract
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911
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(376KB) (
696
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An experimental setup is designed to investigate the osmosis phenomenon quantificationally for the basic physics experiment courses. In the experiment, the linear relationship between the osmotic flow and the concentration difference of solutes across the membrane is obtained, and thus the empirical equation of osmotic flow is confirmed. Furthermore, this paper gives the qualitative interpretation of the osmosis phenomenon from the macroseopical and microcosmic physics and introduces the derivation of the law of van＇ t Hoff by elementary kinetic theory.
Information fusion method for objective and subjective measurement of wavefront aberrations of human eye
. 2009, 28(10): 38-38.
Abstract
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834
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(663KB) (
531
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The human eye is not a perfect refractive system, there exists various aberrations in it, and the vision is not influenced only by the refractive system, but also by the subjective judgment and nervous system. The measurement combined of the subjective and objective can give the best correction data. Thus, it is presented that the information fusion method for combination of objective and subjective measurement of human eye to obtain the only correction data which are used for eyes rectification. The experiment gives the ocular＇ s aberrations after the information fusion of the measurement.
The improvement of Wilson chamber and related research by Blackett
. 2009, 28(10): 45-45.
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819
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852
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The biography of Blackett is outlined. How he improved the Wilson chamber and he provided evidence of the artificial nuclear reaction, and how he confirmed the existence of positive electron and research the cosmic rays are reviewed. The factors which lead his success are analyzed.
Research and oriented teaching for practice in the course of electrodynamics
. 2009, 28(10): 51-51.
Abstract
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883
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743
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In the practice of teaching electrodynamics, we have followed the education principles： multi-teaching-modes based on society demand; teaching manner and contents adapted to students＇ aptitude. Both in-and outclassroom studies are emphasized; both paper-reading and seminar are emphasized; both fundamental knowledge and progress of physics frontier are emphasized. We encourage and guide the capable students to join research projects in earlier stage, and select some students who are interested in theoretical physics to form the intensive class of theoretical physics in higher class, for training reserve force of physics research. The faculty combining teaching with scientific research is the base of research-orientated teaching.
Research and practices of educational reform of college physics experiment in local comprehensive university
. 2009, 28(10): 54-54.
Abstract
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966
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1134
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It is emphasized for a local comprehensive university to cultivate high-caliber and practical talent students for local economic construction and social development. We make a series of researches of how to serve the talent-training goals of college physics experimental education. We induce a reformation pattern of ＂four, three, two, one＂ and achieve obvious achievement.
Research on the experiment of liquid leaking back and forth through a small hole
. 2009, 28(10): 58-58.
Abstract
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951
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(259KB) (
744
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We carry out a quantitative analysis on the experiment of liquid leaking back and forth through a small hole. Based on the result of the experiment, we conclude that the period of the leaking of the liquid is inversely proportional to the hole＇ s diameter raised to the power of 2.84. The conclusion from the experiment goes against some theoretical analysis.
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