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Table of Content
20 June 2012 Volume 31 Issue 6
著者文摘
Mobius inversion of convolution-type series and cylindrical functions
. 2012, 31(6): 1-1.
Abstract
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664
)
PDF
(201KB) (
380
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The application of Mobius inversion of the convolution-type series to the cylindrical functions and modified cylindrical functions,as well as their addition formulas and multiplication formulas,are discussed systematically.Many new interesting results are shown.
Research on the vector differential operator △↓
. 2012, 31(6): 7-7.
Abstract
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1016
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PDF
(504KB) (
1282
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The invariable form of vector-differential operator △↓ in gradient,divergence,rotation and Laplace operator of various orthogonal coordinate systems with differential geometries is studied,and the origin of confusions appeared in the operator △↓ used is also discussed.The opinion and solution of vector operation priority in bracket are advanced,which will remove some misconceptions in the operator △↓.
Investigation on the homogeneity of magnetic field in spherical coils
. 2012, 31(6): 13-13.
Abstract
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817
)
PDF
(444KB) (
498
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The homogeneous property of magnetic field in spherical coils is investigated.From the magnetic field along the axis of circular current coil,we get the quantitative relation between the windings and homogeneity of the homogeneity of magnetic field in the spherical coils with the help of the superposition principle and symbolic operation of Mathematica.Through examples,the method to design homogenous area of magnetic field in spherical coils is explained.This study will provide theoretical help for constructing large uniform-magnetic-field workroom.
Using elliptic cylindrical coordinate to solve the potential and field of equivalent coordinate charged cylinder conductors
. 2012, 31(6): 17-17.
Abstract
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639
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PDF
(318KB) (
441
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The potentials and fields of equivalent coordinate confocal and coaxial charged elliptic cylinder conductors and charged hyperbolic cylinder conductors are given by using elliptic cylinder coordinates,and some special configurations of cylinder conductors are also discussed.
Research on the equivalent resistance of 2×n ladder resistance network
. 2012, 31(6): 21-21.
Abstract
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826
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PDF
(308KB) (
332
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The recurrence formula of every branch of 2×n rank ladder resistance network by equivalent transform are obtained,the equivalent resistance expression of every branch is calculated,and the equivalent resistance between end points is got.
Exact traveling wave solutions for a class of nonlinear wave equations
. 2012, 31(6): 25-25.
Abstract
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610
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PDF
(241KB) (
342
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By introducing the improved G′/G expansion method,a series of new exact traveling solutions are obtained for a class of nonlinear wave equations with the aid of computer algebraic system of Mathematica.These solutions include solitary wave solutions,hyperbolic function solutions and trigonometric function solutions.
Error analysis of simple harmonic vibration velocity measurement
. 2012, 31(6): 28-28.
Abstract
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1657
)
PDF
(348KB) (
1986
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Using the average speed from t to t＋Δt to express the instantaneous velocity at t＋Δt/2 rather than t is proposed for the experimental data processing of the problem of simple harmonic analysis.Polynomial least-squares fitting of experimental data obtained is consistent with the theoretical calculation of the vibration curve.
Study of self-induction demonstration experiment based on the DISlab
. 2012, 31(6): 31-31.
Abstract
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732
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PDF
(379KB) (
328
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The traditional self-induction phenomenon demonstration experiment can only be studied qualitatively in high school physics teaching.Carrying out the traditional self-induction phenomenon demonstration experiment study with DISlab can achieve a qualitative and quantitative research.Through the experiment circuit improvement,the effect of experimental demonstration is further enhanced.During the experiment,we find some special phenomena and thinking them deeply.As in the current,a peak is appeared before the voltage stability in the light bulb,and when changing the polarity to repeat the experiment,the relaxation time becomes long,etc.
The effect of temperature on the static characteristics of Hall displacement sensor
. 2012, 31(6): 34-34.
Abstract
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794
)
PDF
(264KB) (
735
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The static characteristics of Hall displacement sensor are studied under different ambient temperatures.The results show that the difference of static characteristics of Hall sensor is apparent with temperature changing,which is analyzed from the theory.An example is given to explain for application.
Using electronic spin resonance to measure the magnetic field strength and dip
. 2012, 31(6): 37-37.
Abstract
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842
)
PDF
(359KB) (
885
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Using radiofrequency period of electronic spin resonance experiment instrument,we accurately measure magnetic field strength and dip of Yanan local,in which the constant magnetic field for the reverse signals and resonance spacing resonance conditions are applied.
What does the Nobel Prize look like from the technical perspective
. 2012, 31(6): 41-41.
Abstract
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660
)
PDF
(528KB) (
458
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By analyzing the subtle differences in words of Nobel＇s will on the three scientific prizes,we can draw the conclusion that physics has a very important mission to invent new technology for human being.The relation between each kind of Nobel Prize in physics and technology invention is pointed out from the preliminary classifications for the 104 times Nobel Prize in physics.We believe it must be not a theory research which could help the physicists of China to win the Nobel Prize.
Study of the digital holography applied to experimental teaching of the principium for the propagation of the object wave
. 2012, 31(6): 45-45.
Abstract
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672
)
PDF
(758KB) (
357
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Digital holography is based on the optical holography.The hologram is recorded by CCD and transferred to a computer.The reconstruction is fulfilled digitally in the computer with the simulated reference wave,and the quantitive amplitude and phase information of the whole wave field can be obtained from only a single hologram.Thus the digital holography has many potential applications.The study of the digital holography applied to the experimental teaching of the modulation principium for the propagation of the object wave,not only make the students have the vision and intuitionistic comprehension with the modulation principium for the propagation of the object wave,but also exercise their ability to apply the knowledge through completing the numerical reconstruction of the digital hologram by programming calculation.Furthermor extend their professional knowledge and learn the cutting edge of scientific development.
Hierarchical teaching of American university
. 2012, 31(6): 50-50.
Abstract
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777
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PDF
(674KB) (
593
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Hierarchical teaching and curriculum arrangements for physics education in American university are introduced and discussed in detail with MIT,Yale,and Stanford as the examples.The detailed and substantial content will make readers know deeply about physics education of American university.Those will also contribute to the reform in college physics education in China.
Application of a new anisotropic magnetoresistive sensors for measuring the earth-magnetic field
. 2012, 31(6): 57-57.
Abstract
(
806
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PDF
(360KB) (
841
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Measurement of the earth-magnetic field is difficult and its exactness is low,because the earth-magnetic field is so weak and about 10-5 T.This article discusses about the application of a new anisotropic magnetoresistive sensors for measuring the earth-magnetic field.It is found form the experiment that the new magnetoresistive sensor has the advantages of simple operation,high sensitivity and exactness when the measuring of earth-magnetic field is applied.Except its application value,the experiment is also suitable for the college physical experiment.
Research on the noncoalescing phenomenon between drops and vibrating liquid surface
. 2012, 31(6): 60-60.
Abstract
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789
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PDF
(596KB) (
514
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The phenomenon that silicon oil drops stay on the vibrating liquid surface is found.Experiment of equal thickness interference indicates the existent of air film.Based on the analysis of the air film＇s transformation,a simplified model is proposed to explain how the air film inhibited the coalescing of drops and liquid surface.Drops underneath the liquid surface are observed and theoretical model is founded to calculate the thickness of air films,which is also compared with the experimental value.The paper also describes and explains the breath-mode vibrating phenomenon of multiple drops.
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