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Table of Content
20 September 2007 Volume 26 Issue 9
著者文摘
The shape of light wavefront in biaxial crystal
. 2007, 26(9): 1-1.
Abstract
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849
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PDF
(305KB) (
821
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Based on the functions of parametric plot 3D of Mathematica 5.2, we succeeded in drawing three dimensional graphics of wavefront in biaxial crystal by computer.
Dialogues on Young- Laplace equation and Kelvin equation
. 2007, 26(9): 4-4.
Abstract
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1018
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PDF
(301KB) (
1026
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Some important questions in derivation and application of Young - Laplace equation and Kelvin equation are discussed
Diffraction state of an atom and its probability distribution in the gravitational field
. 2007, 26(9): 8-8.
Abstract
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617
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PDF
(217KB) (
361
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The diffraction state and its probability distribution for an atom passing through a single slit, double-slit or N-slit in the gravitational field is derived using Feynman＇path integral approach in the quantum mechanics. It shows that the fringe shift is dependent on the acceleration of gravity in an approximate conditions, but the fringe spacing is not dependent on it.
Once more about ＂the collision of particle and a homogeneous free bar＂
. 2007, 26(9): 11-11.
Abstract
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1065
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(195KB) (
589
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The physical rule of the collision of a particle and a free bar at any point is discussed, and ＂the two bodies not necessarilly move together after completely inelastic collision＂ is pointed out to be wrong.
Analysis on movement of the spring system with three particles
. 2007, 26(9): 13-13.
Abstract
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942
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(268KB) (
380
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The spring system with three mass points is studied. The differential equations of three mass points are derived for different mass relations between them, and their analytic solutions are obtained, by which the movement rule of three mass points are discussed.
On an integral formula of Legendre polynomial and its simple application
. 2007, 26(9): 17-17.
Abstract
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882
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PDF
(212KB) (
489
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An distribution of the integral formula of Legendre polynomial and a method of proving this formula are given. The static electromagnetic fields of a uniformly charged and current-carrying ring are calculated by this formula.
Calculation of the electric field between a charged cylinder and the grounded conductor plane by conformal mapping
. 2007, 26(9): 20-20.
Abstract
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806
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PDF
(204KB) (
494
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The static electric field between a charged cylinder and the grounded conductor plane are investigated by conformal mapping. The expression of the electric potential and field intensity are obtained, and the equipotential surfaces and line of field as well.
The vibration of a system consisting a mass point and a massive spring which is hung vertically
. 2007, 26(9): 22-22.
Abstract
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740
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PDF
(314KB) (
432
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The law of change of the amplitude and the period is discussed, when the ratio of the mass m0 of mass point and the mass m of spring approaches to infimite and zero and when the system is placed on a smooth horizontal plane.
Calculation and discussion of the vector magnetic potential of a system consisting a line electric current and an infinite long magnetic dielectric column
. 2007, 26(9): 27-27.
Abstract
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842
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(343KB) (
666
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The vector magnetic potential of a system consisting a line electric current and an infinite long magnetic dielectric column is calculated with the method of separation of variables and method of images, it is pionted out that the vector magnetic potential of a system consisting a line electric current and a magnetic dielectric plane, an ideal paramagnetic column, a superconductor column, and a line electric current in homogeneous magnetic field can all be deduced from our calculation.
A discussion of sound speed measurement
. 2007, 26(9): 31-31.
Abstract
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921
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(215KB) (
931
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A kind of the sound speed measurement called the resonant interfering method is analyzed theoretually. So that the students can understand the physical picture of this experiment more clearly
Theoretical analysis on ballistic galvanometer coil movement
. 2007, 26(9): 34-34.
Abstract
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737
)
PDF
(216KB) (
510
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The working principles of ballistic galvanometer is introduced and the movement state of its de＇ flection coil in the magnetic field is analyzed. Some mathematical and physical methods and electromagnetical knowledge are used to deduce physical formulas for various movement states, and to reveal the movement laws of deflecting coil, which exerts great significance on apparatus adjusting and experimental circuit designing.
Measuring the refraction index of transparent glass-plate with secondary imagery method BA
. 2007, 26(9): 37-37.
Abstract
(
859
)
PDF
(252KB) (
337
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The theory and method of measuring the refraction index of transparent glass-plate with secondary imagery method are introduced. Since using CCD, the high measurement precision is obtained.
An experimental analysis of cosmetics for the property to defend the ultraviolet ray
. 2007, 26(9): 40-40.
Abstract
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650
)
PDF
(234KB) (
508
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Making use of a sectional and multi-function grating spectroscope, the bromine tungsten lamp and absorbing pond, an analysis of cosmetics for the property to defend the ultraviolet ray is accomplished. And this is designed as a student experiment.
Metal/semiconductor granular films prepared by RF magnetron sputtering method
. 2007, 26(9): 43-43.
Abstract
(
744
)
PDF
(307KB) (
588
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Metal/semiconductor Fex （In2O3）1-x granular films are prepared by RF sputtering method. The microstructure and magnetic properties are studied. The experiment results showed that the nanometer-sized Fe particles uniformly dispersed in the amorphous In2O3. At room temperature, the film shows superparamagnetic behavior, following the Langevin equation.
The establishment of the BCS theory of superconductivity
. 2007, 26(9): 46-46.
Abstract
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1629
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PDF
(505KB) (
1483
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The careers establishment of the BCS of John Bardeen, L. N. Cooper and J. R theory is reviewed. The impact and the theory are summarized. Helpful inspiration we can draw is outlined Schrieffer are introduced. The process of the significance of the establishment of the BCS
To teach ＂big＂ physics from ＂small＂ physics
. 2007, 26(9): 52-52.
Abstract
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857
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PDF
(412KB) (
679
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Direction and way of reform of Chinese education is discussed, taking nine examples in university physics,we introduce how to teach big physics from small physics and how to lift law from local to whole, increasing teaching benefit by transition from the old conception to the new must be attached.
Measurement of magnetoelectric effect by using a dynamic method
. 2007, 26(9): 56-56.
Abstract
(
755
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PDF
(319KB) (
322
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The measuring principle of the magnetoelectric effect by dynamic method is described, and the corresponding measuring device is optimized to design and set up. The effect of some important parameters on the measuring results is investigated. It are shown that the choice of the suitable parameters is important for the measuring results and the actual reqiurement must be meeted during the design of the measuring device. It is advantageous for the improvement of the measuring precision and reduction of the measuring errors to enlarge the length of the coil,decrease the number of turns of the coil,and reduce the strength of the AC magnetic field.
The electromagnetic field in half-round waveguide
. 2007, 26(9): 60-60.
Abstract
(
884
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PDF
(288KB) (
437
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The electromagnetic fields components of the TE wave mode of a half-round waveguide are obtained theoretically, by using the conclusions of the rectangle and the circular waveguide, the superposition method and the mirror image method etc. Based on the special properties of the metal contact surface, on certain conditions the electromagnetic field components of the half-round waveguide are given. At last,the electromagnetic fields components of the halE-round waveguide are shown by transitional method,on general conditions. rect
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