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Table of Content
20 June 2010 Volume 29 Issue 6
著者文摘
Newtonian mechanics examined with Galilean transformation
. 2010, 29(6): 1-1.
Abstract
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804
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402
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The laws of Newtonian mechanics are examined with the Galilean transformation. It turns out that some of them obey the principle of mechanical relativity and the other do not.
Some problems concerned with the teaching of electromagnetics
. 2010, 29(6): 3-3.
Abstract
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887
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559
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Three problems concerned with the teaching of electromagnetic are discussed in this paper. The first problem is ＂the noelectrostatic force and the nonelectrostatic field＂, the second is ＂definition and classify of electric current＂ and the last is ＂when the dielectric is exist, how to calculate the electric field intensity＂. This paper describes the author＇ s own point of view, we hope to attract everyone＇ s attention and discussion.
Application of Nomorgragh in the imaging analysis of the thin lens and spherical mirror
. 2010, 29(6): 5-5.
Abstract
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942
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(369KB) (
484
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Under the paraxial rays condition, the Gaussian equation and light path method can be used to analyze the relationship between object and image of the thin lens or spherical mirror. The Nomorgraph, introduced here, uses the Cartesian coordinate system as the medium to analyze object-image relation. The schematic method of this kind is simple and intuitive. We can quickly estimate the character of the real or visual image as well as obtain their exact position. It is a great supplementary to the traditional method.
Geometric phase in the Jaynes-Cummings model
. 2010, 29(6): 9-9.
Abstract
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714
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(264KB) (
328
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By means of the concept of the Aharonov-Anandan phase, the geometric phase of the Jaynes-Cummings model system is presented for the ＇initial state with the fixed photon number.
A note to the mechanical principle of lion running ball- On the relationship between external force and internal force
. 2010, 29(6): 12-12.
Abstract
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878
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(276KB) (
911
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With the instance of lion running ball, the relationship among internal force, external force and motion is studied using the Newtonian laws. The friction which obstacles the relative motion between ball and land is the necessary condition for the motion of runner-ball system, and is equal to the ratio of system momentum in horizontal direction. However, the internal force between runner and ball in vertical direction is the real dynamic to drive the ball rotating and moving forward.
The electric field of a line charged and a grounding conductor with the protruded semicylinder
. 2010, 29(6): 15-15.
Abstract
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787
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(326KB) (
489
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The electric field of a line charged and a grounding conductor with the protruded semicylinder is calculated by using the Zhukovsky mapping in 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.
An approximation approach of self-consistent average value to nonlinear harmonic oscillators
. 2010, 29(6): 18-18.
Abstract
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863
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(264KB) (
843
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By utilizing the approximation method of self-consistent average value, the eigenvalue is given for nonlinear harmonic oscillators with third power or fourth power potential. The results coincide with the ones derived from perturbation method.
The property on qubit of sigle electron in one-dimensional parabolic potential
. 2010, 29(6): 21-21.
Abstract
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786
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(269KB) (
324
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A qubit is formed by overlapping the ground state and the second excited state of single electron in one-dimensional parabolic potential and the property of qubit is studied. The numerical calculations show that the probability density distribution of electron in qubit varies with varying space coordinate, its amplitude is maximal in the equilibrium and smaller in other positions. It is also shown that the probability density of electron in all space point oscillate periodically with time and the oscillating period is determined by the character of parabolic potential.
Comparison and conversion of different conventions in general relativity
. 2010, 29(6): 24-24.
Abstract
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934
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(360KB) (
508
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In general relativity there are some different conventions due to different definitions of the metric tensor, the Ricci tensor, and the cosmological constant. We compare these conventions and give the conversion relations between them.
Derivative of unit basic vectors in orthogonal curvilinear coordinate system
. 2010, 29(6): 27-27.
Abstract
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1731
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(228KB) (
1678
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Though the transformation matrix between the unit basic vector in deferent orthogonal curvilinear coordinate system, we deduce the law of the unit basic vectors derivative of their own coordinates and the time in the orthogonal curvilinear coordinate system. As an example, the derivation of the unit basic vectors self space coordinate in the spherical coordinate system and the cylindrical coordinates system is also discussed.
flame observation and demonstration under the condition of microgravity
. 2010, 29(6): 30-30.
Abstract
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935
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936
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According to the principles of demonstration experiment of drop tower, we built a short-term micro -gravity experiment system to carry out simulations in a micro-gravity environment and observe changes in theshape of candle flame and explain its causes.
Modeling involvement in teaching process of spectroscopic ellipsometry
. 2010, 29(6): 33-33.
Abstract
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864
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(453KB) (
586
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The thickhess and optical constants of the films can be obtained accurately and quickly by spectroscopic ellipsometry,and it is very important in the college physics teaching. But the emphasis is mainly on the theory analysis. In this paper, many useful models are introduced and their applicable area is also presented in detail. Furthermore,the technical skills are discussed by means of several examples.
Research of β decay of nuclei by magnetic spectrometer
. 2010, 29(6): 37-37.
Abstract
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995
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624
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On basis of Fermi theory of β decay for nuclei, the momentum distribution of 990Sr-90YB radioactive source is measured by using the magnetic spectrometer in the modem physics experiment, then one studies its Kurie plot. The experimental data are considered the correction of shape factor S1 with the characters of Kurie plot for allowed transition and forbidden transition of ~ decay. The corrected data are in agreement with the transition character, the spin and parity of energy level for 90Sr-90Y source. It is helpful to deeply know the β decay of nuclei and expand the studied contents of the modem physics experiment for students.
Visualization of vibration modes on plates
. 2010, 29(6): 40-40.
Abstract
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811
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371
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Analytical expressions of vibration modes on circular and special triangle plates are derived. Their shape are also got by Mathematiea 7.0 and agree well with that of experiments.
On teaching practice of college physics based on original physical problem
. 2010, 29(6): 43-43.
Abstract
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672
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(686KB) (
924
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The original physical problem from the point of description is redefined, the necessity of introducing original physical problem into college physics and presents teaching method in teaching practice of college physics emphatically are discussed in detail.
Detailed investigation on the Chua＇ s nonlinear circuit- A novel approach for parameter measurement and phenomena observation
. 2010, 29(6): 53-53.
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917
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1858
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Parameters of elements in the nonlinear circuit are measured precisely. A novel approach is proposed for a precise and convenient characterization of the nonlinear negative resistor. Based on this improved approach, it is possible to demonstrate simultaneously the chaos states of the circuit and their related I-U working regions of the nonlinear negative resistor, which is very helpful for a better understanding of the origin of nonlinear phenomera in the Chua＇ s circuit.
Exploring the laws of thermal radiation
. 2010, 29(6): 58-58.
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929
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(759KB) (
641
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The law of thermal radiation is an important discovery in the history of physics. We introduce the exploring process of the law mentioned above in a modern manner to promote the creative ability of students.
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