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Table of Content
20 July 2009 Volume 28 Issue 7
著者文摘
Investigation on the interference fields by bihalf-lens
. 2009, 28(7): 5-5.
Abstract
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889
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352
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Based on the method of wavefront analyses and the Kirchhoff diffraction integral expression, we derive the complex amplitude distribution along axis of Fresnel diffraction fields by a circular aperture or a half-circular aperture, which is illuminated by a convergence spherical wave. The phase distribution is especially focused and the phase difference formula between both symmetrical points beside the image point is given. The result shows that the phase change pass through the image point is continuous. Then the present result is applied to the bihalf-lens i. e. , the Meslin interference experiment. The phase difference formula as well as the intensity distribution between two diffraction fields respectively by a single half-lens are shown under two different situations, one is the focal lengths equal while the object distances not equal, another is the object distances equal while the focal lengths not equal. The results lead to a conclusion： the effective phase difference along axis between both two diffraction fields may be not equal to zero or π, it is also possibility to arise a change of this phase difference as a sawtooth form. This study provides a reliable theoretical way to exactly analyze the interference field from two diffraction fields by bihalf-lens.
Discussion on the skin effect in transmission line of signals
. 2009, 28(7): 10-10.
Abstract
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751
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406
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The skin effect directly affects the transmission properties of wire, the attenuation pattern of electromagnetic wave in half unlimited conductor is usually used to describe the skin effect in wire, the qualitative description directly. This paper analyses the distribution of electric current in wire by solving the Maxwell equation and reaches a conclusion that there is skin effect in wire, and deduce the formula to calculate the AC resistance of isolated wire.
Scattering of relativistic and classical particles
. 2009, 28(7): 13-13.
Abstract
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745
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389
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The scattering of relativistic particle is discussed. The Lorentz factor formula of scattered particle is found. The results show that the collision rule of high energy particles is the same as the one of low energy particles if the masses of two rest particles are the same; the velocities of colliding particles are interchanged in collinear collision. If the masses of two rest particles are different, the collision rule of high energy particles differs from the one of low energy particles, the mostly energies of heavy-particle loss in collinear collision, and the velocity of light- particle is equal approximately to the one of light, but is not equal to two times velocity of heavy-particle.
Path-integral solution of a particle＇s motion in a two-dimensional infinite square potential well
. 2009, 28(7): 15-15.
Abstract
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996
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(238KB) (
1369
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The path integral technique is used to calculate the propagator of a particle moving in a two-dimensional infinite square well. Its wave function and energy eigenvalue are obtained.
Vibration of Spring oscillator under sliding friction
. 2009, 28(7): 18-18.
Abstract
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1080
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(175KB) (
594
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To research vibration of spring oscillator in the rough level, we discuss the position of spring oscillator stopping finally. The total degree of vibration of the spring oscillator is estimated and the phase trajectory is obtained.
Rotational conductor in magnetic field and covariance of Maxwell equations
. 2009, 28(7): 20-20.
Abstract
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688
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(293KB) (
542
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The viewpoint in reference that nonzero divergence of electric field E = ±v ×B has nothing to do with electric charge density is challenged. It violates the covariance of Maxwell equation, and the true situation is that the divergence equals still to zero. Taking uniform magnetic field as an example, calculations in uniformly rotational reference system by curvilinear coordinates and Cartan comoving tetrad are performed. It is shown that the covariance of Maxwell equations is retained.
Equation for electromagnetic properties of moving medium
. 2009, 28(7): 23-23.
Abstract
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1138
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(219KB) (
423
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The equation for electromagnetic properties of a moving medium is discussed by using electromagnetic field tensor, electromagnetic induction tensor and their dual tensor. It is pointed out that D = ε E and B = μH are untenable in moving medium. Covariant and vector forms of equation for electromagnetic properties of the moving medium are given.
Three methods for the integral of the squeezing operator in coordinate representation
. 2009, 28(7): 26-26.
Abstract
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871
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(320KB) (
269
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The integral of the squeezing operator in the coordinate representation is obtained by extracting the variable from the projection operator, using the technique of integration within a normal product of operators and transforming the non-symmetric projection operator into symmetric, respectively.
A general study on equivalent impedance of laddered network
. 2009, 28(7): 29-29.
Abstract
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817
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(401KB) (
620
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A nonlinear difference equation model is constructed by analyzing the laddered network, the basic structure of complex impedance network is studied and the equivalent impedance of the network is calculated. A series of general formulas for the complex impedance of laddered network are given and the results are compared with connected argument.
The asymptotic expressions of several common transcendental equations in college physics
. 2009, 28(7): 34-34.
Abstract
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1052
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(166KB) (
525
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The Bulman-Lagrange series is briefly introduced and the asymptotic expressions of several common transcendental equations are derived.
Investigation on measurement of geomagnetic field using the method of magnetic focusing
. 2009, 28(7): 36-36.
Abstract
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748
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(368KB) (
828
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The horizontal and perpendicular components of geomagnetic field, namely, the magnitude and direction of geomagnetic field are measured by using electron charge-mass ratio testing instrument with digital universal meter measuring the magnitude of current and employing positive-going and reverse exciting current focusing method.
Sketch of moisture sensitive polymer use with fiber Bragg grating based humidity sensor
. 2009, 28(7): 39-39.
Abstract
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916
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(352KB) (
573
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In this paper, we study polymer humidity polyimide （PI） thin film for humidity sensor fiber Bragg grating principle and applications, and sensing characteristics of the analysis and measurement. Experiments show that plating has polyimide （PI） thin film of fiber Bragg grating reflection peak position drift volume and the humidity is a linear relationship, easy calibration, realize a high-precision measurement of humidity. Materials produced by this than other types of humidity sensors humidity sensor superior performance.
The measurement of laser wavelength by ultrasonic grating
. 2009, 28(7): 43-43.
Abstract
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948
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(278KB) (
658
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A new method is presented for measuring the laser wavelength. The experimental results are compared with those obtained by the classical Michelson interferometry. We analyze the diffraction spectra of the ultrasonic grating formed by mercury and He-Ne lasers through ethanol solution （97%）. We study further the effect of temperature on the velocity of ultrasonic wave propagation that is first measured using mercury laser. The wavelength of He-Ne laser can be accordingly calculated from the velocity of ultrasonic wave propagation. The relative error between the calculated and the standard values is 0.55%. The new method is comparable to the classical Michelson interferometry.
Spin-valve giant magnetoresistance and multi-layer membrane of the giant magnetoresistance properties of the measurment and comparison
. 2009, 28(7): 45-45.
Abstract
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805
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(371KB) (
302
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The multi-layer magnetic spin-polarized transport and giant magnetoresistance effect are introduced ;the spin-valve giant magnetoresistance muhilayer films with giant magnetoresistanee in the materials aspects of the structure and working principle of distinction are described briefly. The transform of the existing physics laboratory of the university of the experimental apparatus and circuit design experiments simple measurement of these two types of giant magnetoresistance of magnetic properties are used ,which are in accordance with the results of experimental measurements of these two types of sensors and measurement sensitivity in its scope of comparison.
Quark and the spontaneous broken symmetry
. 2009, 28(7): 49-49.
Abstract
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801
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(393KB) (
438
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The mechanism of spontaneous broken symmetry and its model are discussed in the language of fundamental physics, also, the discovery of the mechanism of spontaneous broken symmetry in subatomic physics by Yoichiro Nambu and the discovery of the origin of the broken symmetry by Makoto Kobayashi and Toshihide Maskawa are introduced. The experiments of the discovery of the least three families of quarks are presented.
Multipole expansion of long-range interacting potential in arbitrary dimensional Euclidean space
. 2009, 28(7): 53-53.
Abstract
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632
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(283KB) (
407
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We give the results of the muhipole expansion of a generic longrange interacting potential in arbitrary dimensional Euclidean space and derive the formula of interacting forces between two multipoles of lowest or next-to-lowest orders.
Measurement of the latitude with digital camera （CCD）
. 2009, 28(7): 56-56.
Abstract
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765
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(373KB) (
358
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A brandnew method for measuring the latitude of the observer＇ s location is introduced. By utilizing an ordinary digital camera, we have taken a series of photographs at two consecutive hours. The latitude of our observation station is obtained via the analysis of the data of such photographs. Finally, the measuring latitude of Shanghai China, is N. Lat. 31.3°, which is almost consistent with the standard value.
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