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Table of Content
20 March 2006 Volume 25 Issue 3
著者文摘
Interference of multiple noncoplanar beams and its application in fabrication of periodic microstructures（ Ⅱ ）--3D structures
. 2006, 25(3): 1-1.
Abstract
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949
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270
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The basic principles of formation of three-dimensional （3D） periodic microstructures by interference of four noncoplanar bearns are explained in both the normal space and the reciprocal space. It is shown that all fourteen Bravais lattices can be formed by this technique. The specific beam designs for making some typical lattices are given,and some related problems such as the selection of amplitude ratio and determination of polarization of each beam are also discussed.
The relation between Boyle law and Joule law in relativistic thermodynamics
. 2006, 25(3): 7-7.
Abstract
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1154
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(229KB) (
486
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It is proved in relativistic thermodynamics that Joule law is a deduction of Boyle law, but the Boyle law is not that of Joule law.
A discussion on X-ray reflectivity
. 2006, 25(3): 9-9.
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1152
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1097
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Based on the Fresnel law, the reflectivity of X-ray and visible light are obtained, and the reflectivity-incident angle curves are drawn. The transmission efficiency of a capillary are calculated also with and without reflectivity approximation.
Probability wave and non-probability wave
. 2006, 25(3): 12-12.
Abstract
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986
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369
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Classically, the Klein-Gordon equation was treated as the equation of boson. However, we argue that Klein-Gordon equation is the equation all microscopic particles obey, but not the wave equation for any sorts of particles. We propose that the Klein-Gordon equation contains probability wave and non-probability wave. The probability wave must obey an equation in which the first-order derivative to both time parameter and space parameter appear. We refer to this equation as the wave equation of particles. The different properties of particles root in their different probability wave.
Symmetry and matrix representation of octagonal point groups in quasicrystal
. 2006, 25(3): 17-17.
Abstract
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1393
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1014
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The point groups of octagonal system in quasicrystal are studied. By using stereographic projection of each point group, all symmetry operation and generating operation of the point groups are listed, and group multiplication table of maximal proper point group 822 is filled in. In octagonal coordinate system defined by us, the matrixes of the point groups symmetry operation are derived. There are thirty-two 3 × 3 matrixes. The marixes form are compact, their matrix element possible values are ：0, ± 1, ±√2. Therein,√2 is an especial irrational number,which indicated the quasi-periodicity of octagonal system quasicrystal.
Study on energy of spring that even mass is distributed
. 2006, 25(3): 21-21.
Abstract
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776
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(276KB) (
428
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The energy of the spring that even mass is distributed is studied.
The trajectory of a small ball in circular motion suffered a bigger centripetal force
. 2006, 25(3): 25-25.
Abstract
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930
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(212KB) (
489
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A small ball is making circular motion at the uniform velocity, the centripetal force has suddenly increased,it is proved that the small ball will generally make a spiral motion.
A discussion on a collision problem of classical mechanics
. 2006, 25(3): 27-27.
Abstract
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911
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480
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A collision problem of classical mechanics with the variable coefficient of restitution is thoughly discussed,more detailed result in theory is obtained than that in the origional book.
The distribution of induced charges on a conducting sphere in a uniform field calculated by method of images
. 2006, 25(3): 30-30.
Abstract
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945
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(141KB) (
1032
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The distribution of induced charges on a conducting sphere in a uniform field is calculated by method of images.
Calculation of CG coefficients
. 2006, 25(3): 32-32.
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1764
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(280KB) (
1149
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Clebsch Gordan coefficients of two coupling angular momentum is calculated directly by using the commutation relations of angular momentum operators.
Measurement of magnetic field force and permeability of vacuum
. 2006, 25(3): 35-35.
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1028
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(250KB) (
499
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The theory and method of measuring the magnetic force between two current carrying wires and permeability of vacuum by an electronic balance are reported.
The measurement of mutual inductance by using the transient process
. 2006, 25(3): 38-38.
Abstract
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740
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(307KB) (
374
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Two methods are introduced for measuring the mutual inductance of AC components by employing the square-wave source through the transient process in RL or RLC circuits.
Holographic memory of methyl violet dyes doped polyvinyl alcohol thin film
. 2006, 25(3): 41-41.
Abstract
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729
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(292KB) (
270
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Methyl violet dyes doped polyvinyl membrane build phase grating under two branchs of coherent beams irradiation. While changing one branch the range of one coherent light, the growth and erasure process of the phase grating can be examined through monitoring the changes of first order diffraction light intensity. The theory and experimental results are provided.
Measuring Young＇s modulus by laser lever
. 2006, 25(3): 44-44.
Abstract
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889
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(231KB) (
726
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If the semiconductor laser is made as laser lever, it can be applied to the experiment of measuring Young＇s modulus by the pulling method. This can simplify the installation of experiment, and raise the amplification index of the stretched mini-amount
George Green and Green function method
. 2006, 25(3): 46-46.
Abstract
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1299
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950
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Geo briefly introduced, the path in which rge Green was an important physicist. Green＇s life and his experience on science research are the main fators which help Green do the science works of great value are revealed, and draws Green set up Green function method.
From fish basin to tsunami
. 2006, 25(3): 50-50.
Abstract
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979
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542
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The mechanism of Indian Ocean tsunami of 26 December 2004 was newly revealed by American geophysicists. The tsunami could be partially caused by the lowest normal modes of the earth spheroidal oscillation excited by the earthquake. This mechanism is in principle similar to that of water spouting from a Fish Bowl, in which water is stimulated by self-excited standing waves of the round wall of the basin. This investigation would make early tsunami alert possible and more reliable.
The key technology in phased array ladar based on the wave theory
. 2006, 25(3): 55-55.
Abstract
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913
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454
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The principle of phased array is introduced from the principle of superposition in the wave theory. The background and status in the application of key technology to the phased array ladar, which is composed of photo-electron technology, signal processing technology, computer technology and solid state technology, are introduced summarily.
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