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Table of Content
20 September 2005 Volume 24 Issue 9
著者文摘
On the general properties of time-dependent invariants
. 2005, 24(9): 1-1.
Abstract
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831
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584
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Several general properties of time-dependent invariants in quantum mechanics are discussed, some of which were not mentioned in the literature.
Solving the vibration problem of elastic rod with concentrated mass on one end by Laplace transformation
. 2005, 24(9): 4-4.
Abstract
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739
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(196KB) (
477
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We have extended the method used in our one end attached to a concentrated mass and another paper to the case of forced vibra.tion of an elastic rod end subject to a homogeneous boundary condition. We have also discussed free vibration of an elastic rod with two ends attached to concentrated mass.
Dynamic analysis for a Brownian particle in optical trap
. 2005, 24(9): 7-7.
Abstract
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847
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PDF
(228KB) (
399
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By solving the dynamical equation of a Brownian particle in a optical trap and analyzing the solutions, characteristics of the position measuring system can be obtained. Results indicate that the Brownian particle obeys Boltzmann distribution; in order to measure the motion, the order of nanometer spatial and millisecond temporal resolutions are necessary.
A discussion of the problem of the rotation on the horizontal-bar by the method of modelization
. 2005, 24(9): 9-9.
Abstract
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887
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(287KB) (
527
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A physical model is constructed for an athlete on the horizontal-bar,and how to increase the energy of rotation when he is rolling on the horizontal-bar is discussed, including how the rigidity and flexibility of the bar affects the rotation and how to choose the best opportunity of the stretching and the contracting.
Spatial distribution of magnetic field generated by current loop
. 2005, 24(9): 13-13.
Abstract
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1274
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PDF
(320KB) (
821
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The general expression of the magnetic field at the arbitrary point of a current loop is presented by using Bio-Savart＇s law directly and the spatial distribution diagrams of the magnetic field strength is drown by using computers. The magnetic field strength at the center axis of the loop, on the plane of the current loop and in the distant area are discussed in detail too.
A discussion of collision of two bodies from the viewpoint of energy
. 2005, 24(9): 18-18.
Abstract
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1081
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(213KB) (
1288
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The formula of loss of energy for central collision of two bodise is deduced from the viewpoint of energy,and phyiscal meaning of the coefficient of restitution is discussed again from this viewpoint.
Image problems in the presence of both a conductor and a dielectric
. 2005, 24(9): 20-20.
Abstract
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657
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PDF
(205KB) (
322
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Image problems in the presence of both a conductor and a dielectric are considered. Shortcomings in some books, we are pointed out and made some necessary corrections.
A study on magnetic field of plane helix
. 2005, 24(9): 23-23.
Abstract
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761
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(209KB) (
4084
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The numeric solutions on magnetic field of plane helix was solved by MATLAB,it helps to design radial guiding magnetic in engineering.
Calculation of transition probability of Landau system due to light by time-dependent pertubation theory
. 2005, 24(9): 25-25.
Abstract
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843
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(277KB) (
454
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Transition probability of Landau system due to light is calculated by using time-dependent pertubation theory. It is obtained that the final states in dipole transition is only most neighboring states of the initial state
The effect of electric field on the distribution of atmospheric molecular concentration
. 2005, 24(9): 29-29.
Abstract
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928
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PDF
(143KB) (
415
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Polarized atmospheric molecules always tend to move where the electric field intensity is high. On the other hand, their random movements oppose this tendency. As a result, the stronger is the field, the thicker is the molecular concentration. Is it thicker, the atmospheric molecular distribution near a high voltage transmission line than somewhere else？ An equation of atmospheric molecular concentration in electric field is deduced from Boltzmann distribution. It is found out that the influence of electric field on atmospheric molecular concentration is very little.
The grating diffraction and Bragg equation
. 2005, 24(9): 30-30.
Abstract
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1793
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PDF
(193KB) (
516
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The incident optical wave arrives the grating at the incident angle α, and the diffraction angle θk of the class k changes with α. The angle between the incident ray and diffraction ray： φ = f（α ）, this function has a minimum. At this time θk and ameet the Bragg law.
Calculation of crystal plane spacing in centered cubic structure
. 2005, 24(9): 33-33.
Abstract
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1098
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PDF
(213KB) (
717
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A method of calculating crystal plane spacing in centered cubic structure is proposed, and several examples are given to verify the validity of this method.
Treating the ground states of hydrogen, positronium and helium atoms by Bohr model uniquely
. 2005, 24(9): 35-35.
Abstract
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1218
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PDF
(209KB) (
1186
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By means of the method, that dealt with the ground states of hydrogen and positronium using the Bohr model, a classical model of the helium ground state is assumed and its energy and radius are calculated. The result is compared with experiment and variational method of quantum mechanics.
The energy postulate and general form of the free energy criterion
. 2005, 24(9): 38-38.
Abstract
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946
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PDF
(397KB) (
510
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The general form of the free energy and its criterion is educed from the energy postulate, and the essential connotation of the free energy and its criterion is discussed. It is considered that the general form of the free energy is summation of all energy forms correlating with N kinds of work in a thermodynamic system and that the inreversible processes of an isolated system for ever results in the reduction of total free energy under the condition of the fixed temperature. It is showed by an example how the general form of the free energy criterion is applied, which embodies the philosophy thought that all kinds of movement may interact.
An analysis of the phenomenon that two like magnetic poles attract each other
. 2005, 24(9): 42-42.
Abstract
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1103
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PDF
(232KB) (
703
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It is well known that two like magnetic poles repel each other. However, this will not always be true. On the special conditions, two like magnetic poles maybe attract each other.
The chaos character of the movement of inverse pendulum
. 2005, 24(9): 44-44.
Abstract
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879
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PDF
(307KB) (
484
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An experimental device of the forced inverse pendulum is designed and the dynamical equation is proposed. By using the method of the linear stability analysis, the stability of the system is discussed in the neighborhood of the equilibrium points. The character of the solutions can be obtained by numerical simulation and other analysis methods. From the results of computer simulation and experiment some time-series diagrams, phase diagrams and bifurcation diagrams for the oscillations of this system, these show that there are various kind of dynamical phenomena in this simple system. Theory analysis and numerical simulation well agree with the experiment results.
Measurement of resistance by complete compensation method and the analysis of error
. 2005, 24(9): 48-48.
Abstract
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2081
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(220KB) (
1240
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A method of measuring resistance by complete compensation is proposed, the analysis of error and advantage are given.
Measurement of chromaticity of color lamp based on light emitting diodes and light guide plate
. 2005, 24(9): 50-50.
Abstract
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698
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PDF
(358KB) (
544
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A color planar lamp, which is composed of tri-color light emitting diodes and light guide plate and is suitable for chromaticity measurement teaching of physics lab work, is introduced, and the experimental method for measuring the chromaticity of the lamp is reported.
Practice in strengthening individuality education of physics--Found the Undergraduate Association of Physics
. 2005, 24(9): 54-54.
Abstract
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638
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PDF
(237KB) (
666
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The Undergraduate Association of Physics was founded for the purpose of setting up a platform for the exploring study of students, making full use of the main body role of students in teaching activities, and improving students＇creativity. This practice has explored an open educational pattern for college students to develop their self-determined and exploring study.
New method of calculating the probability function of carriers occupying the impurity level
. 2005, 24(9): 57-57.
Abstract
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815
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PDF
(282KB) (
525
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The probability functions of carriers occupying the impurity level are calculated by applying the Fermi-Dirac distribution function and the thermal-equilibrium theory of the impurity ionization, the result accord with that obtained by applying the conventional thermodynamic and statistical theory and the method of computing the chemical potential. The new method is very simple, and has very clear physical significance.
The effect of pressure in the experiment measuring heat conductivity of air
. 2005, 24(9): 61-61.
Abstract
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1267
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PDF
(220KB) (
804
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In the experiment measuring heat conductivity of air, We find that the 1/Q is not always linear dependent with lip in the range of 0. 133--1.33 kPa. This derives from the effect of the airflow. As soon as the air pressure increases the temperature rises. While p p〉 1. 33 kPa, 1/Q is in departure from linear with 1/ p again.
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