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Table of Content
20 February 2006 Volume 25 Issue 2
著者文摘
interference of multiple noncoplanar beams and its application in fabrication of periodic microstructures（ Ⅰ ） ——General analysis and 2D structures
. 2006, 25(2): 1-1.
Abstract
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593
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388
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Interference of multiple noncoplanar beams can be used to fabricate 2D and 3D photonic crystals. The basic physical principles of this method are systematically discussed, including the types of structures it may yield, the beam design and polarization optimization. As the first article of this series, the general analysis of multiple noncoplanar beam interference is provided, and the noncoptanar three - beam interference for making 2D periodic microstructures and microfiber bundle is specifically studied.
Calculating precession of the equinoxes by tidal force
. 2006, 25(2): 6-6.
Abstract
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683
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739
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Precession of the equinoxes is calculated by adopting a simple model. The relative error of the result calculated is 3 %.
The relation of directions of phase constant and attenuation constant in conductive media
. 2006, 25(2): 9-9.
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1034
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(315KB) (
460
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Basing on the difference of directions of phase constant and attenuation constant when the electromagnetic wave propagates in conductive medium, using the boundary conditions of electromagnetic wave at the interface of conductive media, the relation equation about directions of phase constant and attenuation constant is derived. The results show that φ and φ satisfy sin φ/sin φ =Ac, where φ and φ are the angles between phase con sin stant, attenuation constant and the normal of the interface respectively, Ac is a constant. The results also indicate the changes of directions of phase constant and attenuation constant are caused when the electromagnetic wave is refracted from one medium into another, and the changes occur on the conductive interface, several examples about layer conductive media are analysed too.
The definition of polytropic process and the relation between it and the quasi-static process
. 2006, 25(2): 13-13.
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964
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854
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The definition of polytropic process and the relation between it and the quasi-static process is discussed.
The period of a nonlinear pendulum calculated by linearization and correction method
. 2006, 25(2): 16-16.
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623
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(223KB) (
832
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The vibration of the nonlinear pendulum is studied by means of linearization and correction method, the curves of the period ratio and the relative error is plotted. The conclusions are tha~ compared to classic solution,the approximate solution has advantage of simpleness and higher accuracy
The comparison of two kinds of Lagrange＇s equations
. 2006, 25(2): 19-19.
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1475
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(336KB) (
776
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Comparing the Lagrange＇s equation of the first and second kind, the advantage and shortage of them are pointed out. The relationship between the two kinds of Lagrange＇s equation is given.
Study on variable mass motion of a soft rope
. 2006, 25(2): 23-23.
Abstract
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546
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(219KB) (
543
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The law of variable mass motion of a soft rope is studied.
A scheme for introducing the concept of thermodynamic scale of temperature
. 2006, 25(2): 26-26.
Abstract
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555
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(155KB) (
672
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A simple and convenient scheme is presented for introducing the concept of thermodynamic scale of temperature in the lecture.
A formula of partial molar free energy in mixture with two matter
. 2006, 25(2): 27-27.
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1492
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(142KB) (
564
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A formula of partial molar pereemage is obtained based on Gibbs-Duhem equation.
The convergence and divergence nature of thin lens in different media
. 2006, 25(2): 28-28.
Abstract
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956
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(151KB) (
601
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From the focal distance formula of thin lens, the convergence and divergence nature of each kind of thin lens are discussed in different media. It is related not only with its shape and the index of refraction, but also with the refractive index of media on two sidesthereof .
Some discussions on phase invariance
. 2006, 25(2): 30-30.
Abstract
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1111
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573
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The principle of phase invariance （also called ＂phase harmonic law＂） in classical wave dynamics as a basic physical principle is discussed and an underlying intuitive reason which lies behind it the order invariance of physical quantities is proposed. Such invariance reflects the principle of relativity. From ＂phase harmonic law＂ we deduced the transformation laws for wave vector, frequency, and group velocity of wave packets while space- time coordinates satisfying Galileo and Lorentz transformation, respectively. Furthermore we discussed the problem of phase transformation for Schroedinger equation and Klein Gordon equation. For Schroedinger equation, we believe that the complex nature of wave function releases the wave function from phase invariance which is inevitable for classical waves （where only the real part of wave function have physical meaning）, thus expanded the physical region. It becomes the basic quantum equation of nonrelativistic particles. Klein - Gordon equation, however, satisfies ＂phase harmonic law＂, we believe that there should be some kind of order invariance for physical quantities behind it. We discussed one possibility from professor Guangjiong Ni＇s two-component （particle and antiparticle） notion to identify such an order.
Comments on Zeng Jinyan＇s textbooks of quantum mechanics
. 2006, 25(2): 35-35.
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815
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1155
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Some basic concepts stated in Zeng Jinyan＇s textbooks of quantum mechanics are commented. The questions involved are： concept of free particle, meaning of superposition principle, reason of assuming Hermitian operator, ＂interference of photons＂, identity principle and symmetrical postulate
Solitons in nonlinear transmission lines
. 2006, 25(2): 42-42.
Abstract
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684
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(429KB) (
625
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Propagation of waves in nonlinear nondispersive and dispersive transmission lines are analysed and the concept of soliton is introduced. Experiments on solitons generated in transmission lines are introduced.
Measuring density of objects with force sensor
. 2006, 25(2): 46-46.
Abstract
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1375
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(269KB) (
1318
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Using force sensor to measure density of objects can improve the accuracy and stability of the experiment as the result of bettering the traditional experimental methods and instruments.
The development and application of viscometer protection case
. 2006, 25(2): 48-48.
Abstract
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484
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(245KB) (
302
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The development, installation and application of viscometer protection case are described in great detail.
An experiment of statistical laws of stochastic error by computer
. 2006, 25(2): 51-51.
Abstract
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622
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(266KB) (
492
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An experiment of statistical laws of accidental error by computer is introduced, pointing out the advantages of the experiment.
Chaotic characteristic analysis and simulations in Chau＇s circuit
. 2006, 25(2): 53-53.
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1110
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(374KB) (
688
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Chua＇s circuit is the simplest circuit, which can become chaotic. The circuit exhibit rich of dynamic phenomenon, it contairis three energy storage elements only. We illustrate the chaotic of the circuit by observe period 1, period 2, single scroll and double scroll chaos attractors, we obtain the chaotic signal by adjusting the parameters of the circuit . Meanwhile we show how to use computer simulate the conclusion of complex dynamic phenomena. We analyze the frequency spectrum with FFT method and simulate the nonlinear equations by using Runge - Kutta method, We also do the curve fitting with least square method. This approach could be use for reference in university experimental study on Chua＇s circuit.
The determination of argon plasma parameters of dielectric barrier discharge at atmospheric pressure
. 2006, 25(2): 58-58.
Abstract
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489
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(254KB) (
389
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How to measure argon plasma parameters of dielectric barrier discharge at atmospheric pressure are described, Electron temperature and electron density of argon plasma are measured and calculated from their emission spectrogram.
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