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Table of Content
20 July 2006 Volume 25 Issue 7
著者文摘
Identification of formulae different frames for Doppler effect in of reference
. 2006, 25(7): 1-1.
Abstract
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1067
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(212KB) (
992
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There are different formulae for Doppler effect using different frames of reference in literatures. By Lorentz transformation these formulae are identified with each other.
The full quantum theory of the lattice and the method of phonon spectrum for 1-dimensional the ‘invariant eigen-operator＇
. 2006, 25(7): 4-4.
Abstract
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1011
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(210KB) (
684
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The full quantum theory of the phonon spectrum for 1-dimensional lattice is proposed, whose Hamiltonian is quantum mechanical ring Hamiltonian with Born-von-Karmann boundary condition. The method of ‘invariant eigen-operator＇ to derive its phonon spectrum is applied.
The relationship between the surface charge density and curvature for an ellipsoidal conductor
. 2006, 25(7): 6-6.
Abstract
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1474
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(145KB) (
847
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Using the Laplace＇ s equation, the potential distribution and the relationship of surface charge density to the curvature of an ellipsoidal conductor are obtained. It turns out that the surface charge density is not proportional to the curvature but to the cube root of the curvature.
The equilibrium position and equilibrium processes of the immersed body in heterogeneous fluid
. 2006, 25(7): 8-8.
Abstract
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1069
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(226KB) (
658
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Taking balloon as an example, the equilibrium position and equilibrium processes of the immersed body in heterogeneous fluid are discussed.
Double reflection of the incident e-ray on the internal boundary surface of uniaxial crystal
. 2006, 25(7): 11-11.
Abstract
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823
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(214KB) (
546
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On the basis of the Fermat principle of the anisotropic medium, the reflection of the incident e-ray is discussed and analyzed on the internal boundary surface of the uniaxial crystal. The reflection formulas of both o-ray and e-ray reflected is derived in any direction of optical axis of the uniaxial crystal, and some special cases are discussed. It is also pointed out that the result is the same as those calculated on basis on the boundary condition of the electromagnetic wave.
Energy analysis of springs in series
. 2006, 25(7): 14-14.
Abstract
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1377
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PDF
(262KB) (
695
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The total kinetic energy and elastic potential energy of springs in series are discussed in the case that the mass of spring can not be neglected. It turns out that kinetic energy of springs in series is related with every spring mass and coefficient of stiffness. However, elastic potential energy is only decided by absolute elongation of springs in series and their coefficient of stiffness.
A discussion on the calculation of a mechanics problem
. 2006, 25(7): 18-18.
Abstract
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778
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(148KB) (
403
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A classical mechanics problem has been resolved from the momentum and energy point of view, respectively. The effect of internal force is analyzed. It helps to comprehend the use condition of the conservation of mechanical energy.
Thermal equilibrium of system with negative heat capacity
. 2006, 25(7): 20-20.
Abstract
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1100
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(249KB) (
952
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Making a postil for instability of system with negative heat capacity, for example black hole, mentioned in ＂Mechanics of new concept physics＂ and ＂Heat of new concept physics＂.
A method to resolve the intensity distribution of diffraction by blazed grating
. 2006, 25(7): 22-22.
Abstract
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1437
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(222KB) (
1282
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A new method is proposed to analyze the Fraunhofer diffraction of blazed grating, which is based on the characteristics of Fraunhofer diffraction by multi-hole. As an example, the intensity distribution of dif- fraction by a reflection blazed grating is investigated.
Principle and test of resonance by hanging string audio frequency coupling
. 2006, 25(7): 25-25.
Abstract
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1013
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(322KB) (
574
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In order to determine Young modulus, shear modulus and Poisson ration of material, the experimental method on hanging string audion frequency coupling resonance is presented. The source of the experimental error is analysed,and Young modulus and shear elastic of 25^# steel are determined.
Research of the auto-measurement system for the single-slit diffraction
. 2006, 25(7): 28-28.
Abstract
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988
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(383KB) (
532
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The system, using the AT89S52 single-chip microcomputer as control centre, step motor driving photo- electric cell is controlled to measure single-slit diffraction intensity point-by-point. Then these data will be sent to a computer by serial port, processed and displayed. With reducing the error in moving photoelectric cell, reading value, and calculating in manual measurement, the system could get higher precision than by traditional methods, and save much time. The system lets the automatization of data collecting, calculating and processing come true.
Experimental study on the strain sensing for fiber Bragg grating
. 2006, 25(7): 33-33.
Abstract
(
897
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PDF
(313KB) (
1312
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The properties of strain for fiber Bragg gratings are studied experimentally. The data are collected and processed by computer. Experimental results show that Bragg wavelength of optical fiber grating has good linearity with its axial strain changes, and that the sensing properties of FBG are greatly influenced by the coating material.
Eddington and the verification of general theory of relativity
. 2006, 25(7): 43-43.
Abstract
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1430
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(298KB) (
1085
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Three astronomical experiments of general theory of relativity at the beginning of its born are introduced, which confirmed the theory＇s accuracy. That Eddington initiated and organized the inspection team to observe the total solar eclipse on May 29th, 1919 for confirming the general theory of relativity is also introdueed.
The equation of motion, numerical calculation and experiment for two-dimensional vibration
. 2006, 25(7): 46-46.
Abstract
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1426
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(289KB) (
934
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The equation of motion for a spherical surface vibration is studied, and the period is analysed. The period of the eθ direction motion of the vibration is also verified by numerical calculation and experiment.
Analysis and removal the high frequency effects in the measurements of thermal conductance using the TW technique
. 2006, 25(7): 50-50.
Abstract
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1098
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PDF
(229KB) (
793
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Abstract： In the measurements of thermal conductance using the thermal wave （TW） technique, there exists a major experimental error caused by the higher frequency wave. An effective method is presented to improve the accuracy by using digital filter to obtain the fundamental frequency.
The effect of molecular force on transport coefficients
. 2006, 25(7): 53-53.
Abstract
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835
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(220KB) (
416
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Considering molecules as elastic particles with molecular attraction in the transport process of gas, the effect of molecular force on transport coefficients is studied. The relation obtained through kinetic theory of gas in general physics between transport coefficients and temperature is modified, the modified one approaches experimental value better.
Discussion on the existence of common eigenstates for any two operators
. 2006, 25(7): 56-56.
Abstract
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1003
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(191KB) (
475
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The general representation of uncertainty principle for any two quantum operators is defined, and the prerequisite of the existence of common eigenvector for any two operators with applications to several nonHermitian cases is presented.
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