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Table of Content
20 October 2005 Volume 24 Issue 10
著者文摘
Bloch's theorem and interference of scattered plane wave
. 2005, 24(10): 1-1.
Abstract
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910
)
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(212KB) (
517
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The physical essentials of the process that the free electron in empty-lattice model becomes Bloch＇ s electron in crystal under the action of perturbing periodic potential are revealed by analysis from the point of view of wave theory. The result indicates that the propagating plane wave representing the wave function of the free election in empty-lattice model brings about various scattered plane waves everywhere in crystal under the action of perturbing crystalline potential, and it brings about Bloch＇s theorem that these scattered plane waves interfere with each other because of the translational symmetry or periodicity of crystalline structure.
The ideal constraint force of 1-order nonholonomic constraint
. 2005, 24(10): 4-4.
Abstract
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954
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(282KB) (
312
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Analyzed the restricted condition with 1-order nonholonomic constraint, the form of 1-order nonholonomic ideal constraint force in the space of C^q is given, and the geometric significance in the velocity space is clarified. It＇s proved that Appell-Chetaev condition is sufficient and necessary condition to realizing 1-order nonholonomic ideal constraint.
The definition of polarization in instructing optics
. 2005, 24(10): 8-8.
Abstract
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1373
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(249KB) (
944
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The definitions of polarization in some Chinese textbooks are analyzed. It is pointed out that the definition only according to the intensities of the electric field in different directions is incomplete, to take into account the statistical property of the polarization is necessary. A proposal is offered in instructing this concept.
An algorithm on the precession of the earth's axis
. 2005, 24(10): 11-11.
Abstract
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851
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(205KB) (
404
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The precession of the earth＇s axis around the planar normal line of the ecliptic is discussed, and the nutation is neglected. A simple algorithm about the precession of the earth＇s axis is approximately presented.
Another way of looking at length contraction
. 2005, 24(10): 13-13.
Abstract
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737
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PDF
(139KB) (
556
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Another way of looking at length contraction is described, and why there are different points of view is discussed.
General discussion on van der Waals gas-liquid state equation
. 2005, 24(10): 15-15.
Abstract
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1068
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(486KB) (
1706
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First of all, the significant historic position of van der Waals equation is commented. Using van der Waals molecular model for gas-liquid states, the deviation of two ideal gas laws, the characteristics of gas-liquid transition and the theorem of corresponding state are analysed premarily. Liquefaction of gas and low temperature techniques are presented briefly and the significance in low temperature physics and theory of phase transition are emphasized.
Review "Demonstration of the theorem of equipartition of energy on rotation and vibration with the extension of Maxwell velocity distribution law"
. 2005, 24(10): 21-21.
Abstract
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813
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PDF
(220KB) (
486
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The probability distribution of the rotation and vibration are derived strictly. It is demonstrated that three distributions not only suit the nearly-independent systems,but also the interacting systems.
The electromagnetic interacting force between two coaxal rings
. 2005, 24(10): 24-24.
Abstract
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892
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PDF
(288KB) (
996
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A formula of electromagnetic interacting force between two coaxal rings is proposed. Based on numerical means,the dependence of this force on the distance of two rings and the radius of them are obtained as well.
An analysis of the optimum conditions of the hyperelastic collision experiment
. 2005, 24(10): 27-27.
Abstract
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913
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(134KB) (
625
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The demonstration experiment＇hyperelastic collision＇ is a typical example of using the knowledge of college physics,and a very interesting one for the students. An analysis of finding the optimum conditions of the experiment is made,which shows that the mass ratio of the big ball to the small one is 3 may be the best con- dition for the experiment.
A novel method for detection of defects for ferromagnetic materials
. 2005, 24(10): 29-29.
Abstract
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949
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PDF
(233KB) (
590
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The property of circular magnetic loop of coil-condenser circuit is studied, and a serials of exploring experiment is carried out to detection of defects for ferromagnetic materials of high pressure vessel. The results show that our instrument is suitable for inspecting the defect of inner of ferromagnetic materials.
The application of CCD in the Malus' law experiment
. 2005, 24(10): 32-32.
Abstract
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913
)
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(253KB) (
443
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An experiment demonstrating Malus＇ law using CCD instead of photocell is reported.
Einstein's cosmological constant and the dark energy of cosmos
. 2005, 24(10): 35-35.
Abstract
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1032
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(384KB) (
794
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The observed evidence of accelerated expansion of cosmos is presented. Derivation of role of Einstein＇s cosmological constant in the accelerated expansion of cosmos is made based on Einstein＇s field equation and dynamic equations. The relation of cosmological constant and dark energy in the cosmos is also discussed.
From Bell's inequality to research of quantum information
. 2005, 24(10): 39-39.
Abstract
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748
)
PDF
(398KB) (
590
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The observed evidence of accelerated expansion of cosmos is presented. Derivation of role of Einstein＇s cosmological constant in the accelerated expansion of cosmos is made based on Einstein＇s field equation and dynamic equations. The relation of cosmological constant and dark energy in the cosmos is also discussed.
The revelation of Joliot-Curie couples process of getting Nobel prize
. 2005, 24(10): 44-44.
Abstract
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1048
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PDF
(536KB) (
407
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The couple of Joliot-Curie won the Nobel chemical prize in 1935 for they discovered the artificial radiation substance. However, they had missed the chance to discover the neutron and the positron. Through the retrospection of Joliot-Curie couples process of getting Nobel Prize we can gain great revelation in the methodology： to emphasize the theoretical thinking, to value the function of academic exchanges, to question the preconceived idea, to cope with the relationship between theory and experiment correctly, to emphasize the function of experimental means and to have a mind of grasping chances.
Historical debates on irreversibility in statistical physics
. 2005, 24(10): 50-50.
Abstract
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1417
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(331KB) (
587
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The contradiction between temporal reversibility of Newton mechanics and irreversibility of thermodynamic process has long been one of the most frequently debated problems in physics and philosophy. This paper retrospects the historical conflicts of opinions on irreversibility through the H theorem introduced by L. Boltzmann. Recent progresses of the study on this issue are also discussed. In the frame of modern ergodic uheory and chaotic dynamics, the contradiction between microscopic reversibility and macroscopic irreversibility can be well understood and answered.
Experience of bilingual university physics teaching in non-physical specialty
. 2005, 24(10): 54-54.
Abstract
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596
)
PDF
(229KB) (
872
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The precession of the earth＇s axis around the planar normal line of the ecliptic is discussed, and the nutation is neglected. A simple algorithm about the precession of the earth＇s axis is approximately presented.
A discussion on energy transfer in ideal parallel plate capacitor
. 2005, 24(10): 57-57.
Abstract
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773
)
PDF
(231KB) (
737
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Some ambiguous analyses widely consist in the study of electromagnetic energy transfer in the process of condenser charging. So, in this paper based on a simple RC circuit, electromagnetic field and electromagnetic energy distribution in and around the ideal parallel plate capacitor are analyzed, and some significant conclusions of electromagnetic energy transfer are made.
Solving the problems of Collins diffraction integral, deducing the formula of the intensity distribution of multi-slit diffraction
. 2005, 24(10): 60-60.
Abstract
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1064
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PDF
(254KB) (
708
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The secondary wavelets of Huygens-Fresnel＇ principle are showed by δ function, solving the problems of Collins diffraction integral, deducing the formula of the intensity distribution of multi-slit diffraction.
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