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Table of Content
20 December 2006 Volume 25 Issue 12
著者文摘
Nonlinear Landau-Zener tunnelling
. 2006, 25(12): 1-1.
Abstract
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1069
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(351KB) (
532
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The basic properties of the nonlinear Landau-Zener tunnelling, a new quantum tunnelling phenomenon is reviewed, which is discovered in interacting two-level systems, such as Bose-Einstein condensates in optical lattices and molecule magnets. It is found that the nonlinearity induced by the repulsive interaction can enhance the tunnelling probability compared to the usual linear Landdau-Zener tunnelling. When the nonlinearity is strong enough, the adiabaticity can break down：an infinitely small external linear force can cause finite tunnelling probability.
Design and application of a new-type tunable infrared filter
. 2006, 25(12): 5-5.
Abstract
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896
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(617KB) (
455
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A new-type tunable infrared filter-liquid crystal Fabry-Perot filter is presented. Its principle, parameter and implementing are introduced. Dependence of transmission spectrum, finesse, and bandwidth on mirror reflectivity and cavity gap are discussed. The impact of applied voltage and temperature on transmission wavelength is analyzed. Several polarization insensitive modules are given. The applications of liquid crystal Fabry-Perot filter to space sensing, especially infrared sensing, are foreseen.
Left-handed materials and negative refractive index
. 2006, 25(12): 12-12.
Abstract
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901
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(238KB) (
494
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A thorough analysis about the way to determine the sign of refractive index in left-handed materials is made. The expression of =√ε√μ is demonstrated.
The velocity of electromagnetic wave in left-handed material
. 2006, 25(12): 14-14.
Abstract
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816
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(327KB) (
362
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In right-handed material, the group velocity and the energy are in the same way of electromagnetic wave, the phase velocity and the group velocity desires of the Rayleigh relation of electromagnetic wave. In this paper, in order to study the electromagnetic properties of left-handed material, the phase velocity, the group velocity and relation each other of electromagnetic wave in left-handed material is proved theoretically, and to a conclusion negative group velocity of electromagnetic wave. The application of left-handed material is introduced.
Dimension analysis based modeling research
. 2006, 25(12): 18-18.
Abstract
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740
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(398KB) (
854
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According to the theory of dimension analysis, the basic thoughts and methods of dimension analysis modeling in the direction of practical engineering prblems are explored.
Analysis of precession of satellite＇s perihelion ——On the carelessness of a paper
. 2006, 25(12): 23-23.
Abstract
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764
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(164KB) (
624
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The carelessness of a related paper is pointed out and precession of satellite＇s perihelion is discussed. The result shows that the speed of the precesson is related with the position of its perihelion.
On the independence of Joule＇s law to the state equation of ideal gas
. 2006, 25(12): 25-25.
Abstract
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864
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556
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There are two paths for establishment of the state equation of ideal gas, to one path, the Joule＇s law is independent, to the other, it is not.
A concise calculating approach to center of mass of some abnormal profile thin plates
. 2006, 25(12): 26-26.
Abstract
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933
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546
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A calculating approaches to center of mass of the abnormal uniform flat-plates are discussed,that is,elementary geometry algorithm without multiple integral approach, and then gives three practical examples. This algorithm is applied to actual mechanical problems so to symptomize its facility and practicable property.
A calculation of the time of the two balls falling to the ground in the tower of Pisa experiment
. 2006, 25(12): 29-29.
Abstract
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892
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(218KB) (
459
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Considering the influence of the air resistance, the time of falling of the two balls are calculated and compared.
An approximate period formula of a simple pendulum derived by linear interpolation
. 2006, 25(12): 32-32.
Abstract
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879
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(211KB) (
498
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By using the method of linear interpolation,an approximate period formula of a simple pendulum is derived. Through the comparison with the accurate formula gotten by Mathematica and other formulae described in different journals, this formula proves to be fairly precise.
Solving axially symmetrical electrostatic field in cylindrical coordinates
. 2006, 25(12): 35-35.
Abstract
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1118
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(313KB) (
804
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To solve axially symmetrical electrostatic field, esented. The series expansion for the potential distribution in the method of cylindrical function expansion is prwhole space with the potential distribution on the symmetric axis is derived, some examples are given.
Characteristics of propagation function of Plane wave diffracted by small circular band
. 2006, 25(12): 39-39.
Abstract
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892
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(343KB) (
575
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Based on the scalar diffraction theory and the boundary condition of Rayleigh-Sommerfeld, the accurate on-axis propagating wave function of plane wave diffracted by small circular band is obtained by solving the first integral of Rayleigh-Sommerfeld. By means of the function, the extremas of on-axis light intensity, the locations and number as a function of the radius of small circular band are analyzed,and then extend the conclusion as the inner radius trends to zero or outer radius trends to infinity. This study offers the conclusion not only for the application of engineering and technology but also for the optics education.
The design of the alternating bridge by amplifying the source with light insulates
. 2006, 25(12): 42-42.
Abstract
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617
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(323KB) (
331
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The alternating bridge has got extensive applications in electronic industry, electric measurements of many non-electric quantities. However, the problem is that, in the application of the bridge, the electric power of the balance null indicator and that of the bridge must be connected to the ground at the same time, They each have earths and cannot be connected together. The problem can be effectively solved by using photocell and LED. A method which is used to solve the problem is reported.
he development and application of multi-purpose electromagnetic demonstration experimental apparatus with acoustic-optic indicator
. 2006, 25(12): 46-46.
Abstract
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717
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(282KB) (
373
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An experimental apparatus is introduced with which four electromagnetic experiments can be done. Its structure, principle and practical effect are described. Main character of this apparatus is that the experimental phenomena are displayed by acoustic-optic indicator.
The magneto-optical modulator without temperature effect
. 2006, 25(12): 49-49.
Abstract
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712
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(185KB) (
292
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A novel magneto-optical modulator is introduced, which used permanent magnet slice, so the tem- perature effect is avoided for the Verdet constant of magneto-optical material. The working principle of the device is described in detail, the ranging of the ZF6, Tb20, Tb25 pushed forward are measured precisely magnetic field is also provided, and the Verdet constants of Lak2, Lak3, in 292 K. So that the study of geomagnetic field imaging technology is and is offered date by this experiment.
A research on madame Curie＇s science methods
. 2006, 25(12): 51-51.
Abstract
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864
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(545KB) (
960
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Because of her research on radioactivity, especially on radium, madame Curie made foundation of atomic physics, radioactive chemistry and radioactive medical. Thus made her won the Nobel Prizes twice and so she become undoubtedly rare in scientific history. A research on her methods of choose, experiment, hypothe sis, logical thinking in her road of science is greatly important in theoretical and practical sense to modern scientists .
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