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Table of Content
20 September 2006 Volume 25 Issue 9
著者文摘
A discussion on the precise measurement of the ground resistance
. 2006, 25(9): 10-10.
Abstract
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614
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461
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According to the principles of physical measurement, the measurement of ground resistance do not posses repeatability and univalue. Practice show that the ground resistance is an unscientific physical quantity.
A model for the small oscillation of non-harmonic oscillators
. 2006, 25(9): 14-14.
Abstract
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816
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(203KB) (
585
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A kind of special non-harmonic motion, i.e. , the transversal vibration of the symmetric double elastic oscillators is discussed, and the exact solutions under the condition of small amplitudes are obtained. It turns out that the periods is inversely proportional to the amplitudes and the deformation of the waves is independent to the amplitudes.
Parallel axis theorem and Koenig theorem deduced from the two laws of rotation
. 2006, 25(9): 17-17.
Abstract
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804
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(126KB) (
568
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Parallel axis theorem and Koenig theorem are deduced from the two laws of rotation.
A new deduction of Lorentz transformation
. 2006, 25(9): 18-18.
Abstract
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925
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905
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A new way of thinking for the arrangement of the two inertial systems S and S＇ in Lorentz transformation is introduced, which causes x axis and x＂ axis to be in opposite direction, then S and S＇ systems are completely symmetrical, and the deduction process becomes easier. According to the arrangement of S and S＇ systems, beginning with the two basic hypotheses of special relativity, Lorentz transformation is deduced strictly.
The energy postulate and the general form of the chemical potential
. 2006, 25(9): 21-21.
Abstract
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1111
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498
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According to the energy postulate, the general form of the chemical potential is educed separately from thermodynamics and non-equilibrium thermodynamics, and two examples are expatiated by the general form of the chemical potential. The results show that the general chemical potential not only expands the chemical potential definition of the classical thermodynamics and field of application, but also indicates the connotation of external physical fields＇ contribution to the chemical potential and effect on the chemical potential. When actual problems are analyzed by applying the general chemical potential, the right conclusion is resulted in by the general chemical potential, and the discussions on problems are simple and easily understood.
The eigenvalue and eigenfunction of a coupled quantum oscillator
. 2006, 25(9): 26-26.
Abstract
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1090
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(214KB) (
567
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The energy eigenvalue, eigenfunction, matrix elements of coordinate and momentum operators in energy trepresentation, and evolution operator for a two-dimentional coupled oscillator are presented by using the general linear quantum transformation theory.
The extraordinary light total reflection angle formula of negative uniaxial crystal with the optical axis in incidence plane
. 2006, 25(9): 28-28.
Abstract
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995
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PDF
(270KB) (
448
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Use Huygens principle the extraordinary light total reflection angle formula of negative uniaxial crystal for the optical axis in incidence plane i = arcsin 1/n√（no^2-nc^2）cos^2a＋n^c2is deduced, and this formula is applied to design and improve Glan-Thompson polarizing prism which is the most economical in consumption of materals as the optical axis is vertical to the interface and θ=26°.
New formulae of Euler angle related to rotating φ around arbitrary axis μ
. 2006, 25(9): 31-31.
Abstract
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1025
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1149
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The method of how to obtain the representation matrix of rotation operation with respect to Euler angles was reviewed. New formulae of Euler angle related to rotating φ around arbitrary axisμ are deduced according to cosine theorem, simple geometry relations and character theory of group. Euler angles related to rotating 2π/3 around line which passes origin and （1,1,1） are obtained employing the obtained expressions.
Discuss about a transition matrix element
. 2006, 25(9): 34-34.
Abstract
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1097
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(215KB) (
437
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The fact that when computing transition of Landau system due to light, the integration variable of computing matrix element xmk,k, ym,k isn＇t dτ = dxdydp but dτ = dxdy is indicated, and that the matrix element Ym,k should be expressed as ympy,kpy^0, is also indicated, and the transition selection principle of Landau system due to light is revised.
A new method using torsion pendulum to verify the parallel axis theorem
. 2006, 25(9): 37-37.
Abstract
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1127
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(206KB) (
762
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A new method using torsion pendulum to verify the parallel axis theorem is reported.
A simple solution of digital secure communication based on Chua＇s circuits
. 2006, 25(9): 39-39.
Abstract
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796
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(293KB) (
456
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A simple chaos-based digital secure communication scheme is proposed which bases on Chua＇ s circuits. Though synchronous and desynchronous of the two chaotic systems, the digital signal is encrypted and decrypted. All the results are acquired in the real electro-circuit experiment.
The application of digital camera in studying damping vibration
. 2006, 25(9): 43-43.
Abstract
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760
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(250KB) (
665
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A way of studying the main feature and motion laws of the damping vibration by the digital camera is introduced.
A system of photoelectric effect experiment based on Small RTOS51
. 2006, 25(9): 46-46.
Abstract
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781
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PDF
(252KB) (
437
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A intelligent, visible, multifunctional photoelectric effect experimental system basing on imbed operate system of Small RTOS51 is introduced from the function of system,hardware configuration and the design of assignment. The data measured by this system are also presented at the end part.
Cavity effect in granular matter
. 2006, 25(9): 55-55.
Abstract
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1510
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359
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The cavity effect in granular matter is studied experimentally. When pulling a stick out the granular matter, it create a sustained cavity under it, and all the system＇s construction will be breakdown because of the cavity, the breakdown situation can be explored by the friction force of the stick. The relationship between the breakdown time t and the cavity＇s depth h is exponential, t is proportion to exp（h/λ） that we obtained by experiment, and it is unaffected by changing the granular size. We do an two-dimension experiment at the same time, to understand the inside situation of the granular matter clearly.
Analytic description of interference of two coherent point light sources
. 2006, 25(9): 59-59.
Abstract
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879
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PDF
(295KB) (
494
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The interference of two point sources is analyzed accurately. The interference pattern and the separation of adjacent bright fringes on different sections are described. And it is found that the separation is the function of the interference order, the wavelength, the source distance, and the observation points. The computer simulation results are given also. These results also work for the interference of other kinds of coherent source.
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