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Table of Content
20 November 2007 Volume 26 Issue 11
著者文摘
The synchronization of clock rate at different places and the measurement of time
. 2007, 26(11): 1-1.
Abstract
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914
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The issues about ＂the simultaneity of two events occurring at two different places＂ and ＂the equality of two durations＂ given by Poincaré and others are introduced. The programme defining simultaneity of clocks located at different places suggested by Einstein, and developed by Landau and others, is presented. We admire Poincaré＇s idea that the convention on the nature for light propagation is the foundation of the measurement of time, and we point out thai the convention on the light velocity is just the convention on the symmetries of space time. The condition on the transitivity of synchronization of clock rate is shown by us on the convention about the light velocity. With the condition, we not only answer the question about the definition of the synchronization of rate of clocks located at different places, but also find the solution to the definition of the equality of two durations. Poincaré＇ s original guess is confirmed. The theoretical foundation on the measurement of time is simplified.
Drude classical electron theory of metal （1900） and London equation （ 1935 ） of superconductor
. 2007, 26(11): 8-8.
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1113
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755
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By comparing Drude classical electron theory of metal with London equation of superconductor those are taught in electromagnetism, author indicates that by use of the same method and different phenomenological model for different objects completely different conclusions have been obtained; from macroscopic domain to microscopic domain phenomenon to essence the developing of physics generally passes through phenomenological theory; how properly to introduce the knowledge of the frontier and progress in science to students is a task which is the focus of people attention, however London equation is the best template.
Further discussions on the derivation of Lorentz transformation
. 2007, 26(11): 11-11.
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1010
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1520
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The derivation methods of Lorentz transformation according to invariance of light speed and principle of relativity are commented.
Einstein＇s special theory of relativity A review by a student for students
. 2007, 26(11): 13-13.
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745
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(560KB) (
525
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This is an essay review of the main contents of Einstein＇s special relativity written by an older student for younger fellow students. Much of the presentation is based on insights gained from personal study
Further calculation and analyzation a kind of problem in electrostatics
. 2007, 26(11): 20-20.
Abstract
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778
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(277KB) (
338
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The results about the magnetic vector potential of current -carrying ring and the electric potential of uniform charged ring which are expressed by Bessel functions are further calculated and analyzed. Some new series solutions about magnetic induction and electric field intensity are obtained and the new results are analyzed and discussed.
Ellipse rotating symmetric group
. 2007, 26(11): 23-23.
Abstract
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802
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431
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The ellipse rotating symmetric group is proposed, which is an Abelian group. The auxiliary parameter ηcharacterizes the shape of the ellipse group orbit. For η= 1, it degenerates to the SO（2） group.
A laconic method for studying the period of＇a simple pendulum
. 2007, 26(11): 25-25.
Abstract
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711
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873
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A kind of laconic method is established for solving the nonlinear dynamics equation and the period of simple pendulum is stadied,three new formulas are obtained, these approximate formulas are compared with the accurate one by charts and errors calculation, furthermore the laconic approximation for complete elliptic integral of the first kind is obtained.
The period of vibration of a homogeneous cylinder in a non- fixed inner semicylindrical surface
. 2007, 26(11): 29-29.
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890
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623
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The differential equations of the system formed by a homogeneous cylinder and a non-fixed inner semicylindrical surface arc derived. According to these differential equations, the critical angle of roiling without slippage of the cylinder is analyzed, and the exact and approximate expressions of the period of vibration in the case of large-angle vibration are derived.
Certification to the relationship between polhode cone and herpolhode cone when the rigid body is in a fixed point motion
. 2007, 26(11): 34-34.
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1056
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2217
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A certification method to the relationship between polhode cone and herpolhode cone is given when the rigid body is in a fixed point motion
The electric field distribution of the system consisting a uniformly charged ring and a conducting sphere
. 2007, 26(11): 36-36.
Abstract
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909
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(275KB) (
404
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According to the method of images, the ＂image charges＂ of a uniformly charged ring in a conducting sphere are studied. In spherical coordinate system, based on the electric formula and Taylor series expansion, the electric field distribution of the ring is obtained in a series form, then combined the uniqueness theorem and the superposition principle, the electric field distribution of this system are derived.
The electric field distribution of the system consisting a uniformly charged ring and a conducting sphere
. 2007, 26(11): 39-39.
Abstract
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1064
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PDF
(298KB) (
775
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According to the method of images, the ＂image charges＂ of a uniformly charged ring in a conducting sphere are studied. In spherical coordinate system, based on the electric formula and Taylor series expansion, the electric field distribution of the ring is obtained in a series form, then combined the uniqueness theorem and the superposition principle, the electric field distribution of this system are derived.
Application of data acquisition with computer in the college physics experiment
. 2007, 26(11): 43-43.
Abstract
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965
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(333KB) (
584
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Application of the computer data acquisition and processing in the college physics experiment teaching is introduced in illustration of the characteristic measurements of temperature sensor, solar cell, and light emitting diode.
On improving the transmission of GSZF-4 Michaelson interferometer
. 2007, 26(11): 47-47.
Abstract
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739
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(357KB) (
290
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By analyzing the full measurement range data of Michaelson interferometer, the regular variation pattern of wavelength measurement errors is found out, the main cause of the measurement errors the device with the transmission ratioof 20：1 is discovered. Furthermore, the concrete methods for ameliorating the device are proposed.
The discovery of Hall effect
. 2007, 26(11): 51-51.
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1297
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1333
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A brief biography of Edwin Herbert Hall is recounted. The discovery course of Hall effect which Hall experienced under the guide of Prof. Rowland is reviewed. The important part which Hall and Rowland played respectively in the research is analyzed, Hall＇s rigorous style and perseverance is stressed.
Research and application for digital network technology in the physics teaching
. 2007, 26(11): 56-56.
Abstract
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689
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(415KB) (
446
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The works in the digital teaching system based network which comes from the latest research of the authers are introduced. It technically guarantees the sharing of high quality teaching resources, and will play an important role in the construction of quality projects in the universities.
Numerical calculation of Fresnel diffraction
. 2007, 26(11): 60-60.
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976
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763
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By using the software Mathematica the relative luminous intensity distributions of Fresnel single -slit and double-slit diffractions are calculated. The condition for transition from double-slit diffraction to Young＇s double-slit interference is obtained as well.
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