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Table of Content
20 February 2004 Volume 23 Issue 2
Viewing the equations of state for gases with the viewpoint of dimensional analysis
. 2004, 23(2): 0-0.
Abstract
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1008
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1105
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The forms of the equation of state for gases are discussed with the viewpoint of dimensional analysis.The dimensional characters of ideal gas, Boyle gas and non-ideal gas are given.
A simple derivation of the solution to nonlinear parameter-variation equation of a swing
. 2004, 23(2): 0-0.
Abstract
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271
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(142KB) (
1059
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The approximate solution to the nonlinear differential dynamic equation of a swing is derived by using another simple method, which is very suitable for discussing in class.
Analysis and calculation of electric potential distribution in infinite two-half-cylindrical conductor tube
. 2004, 23(2): 0-0.
Abstract
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354
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(212KB) (
443
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Taking advantage of separation of variables and finite difference method the analytic and numerical solutions of potential distribution in infinite two-half-cylindrical conductor tube are obtained and analysed, and the results of the electric potential of some places of fields area are figured out by compiling computer program of MATLAB language. Comparing the relative errors between them, the numerical method is effective. Thereout taking advantage of the numerical, the analytic solution of conformal trans...
Theoretic analysis and simulative experiment in the best throwing angle for the shot exercises
. 2004, 23(2): 0-0.
Abstract
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231
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1583
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The influence factors for throwing distance in the shot exercises. Namely initial speed, throwing high, throwing angle are analyzed theoretically and their best combination is obtained, and the result is proved by simulative experiment.
An analysis of the motion of billiards under the action of impulsive force
. 2004, 23(2): 0-0.
Abstract
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486
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(168KB) (
919
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The frictionless impact of billiards due to impulsive force under different conditions is discussed regarded as an illustration of rigid body motion.
The center of percussion of the tennis racket
. 2004, 23(2): 0-0.
Abstract
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310
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(185KB) (
1086
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A problem of the tennis racket's center of percussion is discussed and its location is calculated.
Electric field of a thin cylindrical surface having limited length charged uniformly
. 2004, 23(2): 0-0.
Abstract
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305
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(109KB) (
784
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According to the superposition theorem of the field, the series solutions of the potential and the field of a thin cylindrical surface having limited length charged uniformly are derived.
Rules for rounding interval and significance figure of regression coefficients
. 2004, 23(2): 0-0.
Abstract
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267
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(273KB) (
1215
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The rules for rounding interval are obtained from the criterion of negligible standard deviation for individual measurand. According to strong coherence among the coefficients of regression equation, the significance figure of coefficient uncertainty is often needed to hold over 2 digits. The effective rounding interval is defined. The formulae for the rounding interval of regression coefficients are obtained. The technique will be ascertained by various typical regress examples.
Experimental demonstration and analysis of angular momentum variation when moment of force is suddenly changing
. 2004, 23(2): 0-0.
Abstract
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275
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(110KB) (
1099
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The relationship between angular momentum and direction of angular velocity is presented when a demonstration rigid body is doing fixed point movement, and experimental demonstration and analysis of angular momentum variation when moment of force is suddenly changing to zero.
The influence of measuring method to the result in the experiment of trilinear pendulum
. 2004, 23(2): 0-0.
Abstract
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352
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(147KB) (
3072
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In the experiment of trilinear pendulum,the influence of the approximation used in the deduction to the result of measurement is analysed,and the way to reduce this influence is pointed out.
Measurement of the thickness and refractive index of thin transparency
. 2004, 23(2): 0-0.
Abstract
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288
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922
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A method of measuring the thickness and refractive index of thin transparency is introduced.
The origin and influence of the Solvay physics conference
. 2004, 23(2): 0-0.
Abstract
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476
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910
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The Solvay physics conference is the one of international famous science conference. She was promoted by W.Nernest, a famous phychemist in Germany, and was sponsored by Ernest Solvay, a industrial chemist and social reformer in Belgium. In 1911,first conference was opened at Brussels, the capital of Belgium, this conference produced the greatly influenced on the development of quantum theory. from then, Solvay physics conference, considered as international science conference, has been continued till up to ...
Energy level splitting of the Hydrogen atom in Stark's effect
. 2004, 23(2): 0-0.
Abstract
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320
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(172KB) (
1118
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According to the degenerate perturbation theory and the secular equation, the Stark's effect of hydrogen atom is studied and calculated. A general method for any quantum number nis obtained.
A calculating method of temperature extremum of actual gas in arbitrary process
. 2004, 23(2): 0-0.
Abstract
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201
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(106KB) (
588
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A new method is presented to calculate temperature extremum of actual gas in arbitrary process and an example is given.
Study on the acoustic characteristics of the ancient Chinese chime-bell
. 2004, 23(2): 0-0.
Abstract
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353
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(374KB) (
1184
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Based on the analysis of vibration pattern of round bell and the comparison between different curvature and hardness distribution of almond shaped bell and cup shaped bell, the acoustic characteristics of two-tone effect and the short sound lasting property of the famous ancient Chinese chime-bells are physically analyzed. In order to investigate the function of the so-called Meis, whch are nipple-like nubs on the bell surface, an almond shaped bell with much higher Meis than the originals was cast for test...
Animated demonstration of physical process
. 2004, 23(2): 0-0.
Abstract
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322
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(203KB) (
1265
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Using scientific computing software not only makes CAI lesson featured in science, but also introduces computing method. There are usually three means of animated demonstration in Matlab: programming for objects of figure, interfacing with VRML, getting animation frame. Using these methods, a lot of physical process related with ordinary differential equation or partial differential equation can be animated and simulated.
Nonlinear vibrations, nonlinear waves and Jacobian elliptic functions
. 2004, 23(2): 0-0.
Abstract
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115
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PDF
(320KB) (
371
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Succinct and efficient method to obtain analytic solutions of nonlinear vibrations and nonlinear waves by Jacobian elliptic functions are introduced. Important typical examples are given and explained, including simple pendulum, Duffing oscillator, cnoidal wave and solitary wave solutions of KdV equation, sine-Gordon equation, nonlinear Schrdinger equation, sech~2 profile solitons, kink and anti-kink solitons, breather, interaction of a kink and an anti-kink, and envelop solitons.
Comparison of three driving forces causing the transportation of the sap
. 2004, 23(2): 0-0.
Abstract
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295
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(105KB) (
547
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It is pointed out that there are three types driving forces causing the transport of sap.A calculation is made and the three types of driving forces are compared each other.It turned out that the primary one is the negative pressure formed by molecular force.
Internal friction coefficients deduced from the law of Maxwell distribution of velocities and distribution of mean-free path
. 2004, 23(2): 0-0.
Abstract
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238
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(149KB) (
501
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The internal friction coefficients is deduced from the law of Maxwell distribution of velocities and distribution of mean-free path.
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