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Table of Content
20 June 2008 Volume 27 Issue 6
著者文摘
The fluctuation criterion for thermal equilibrium state
. 2008, 27(6): 1-1.
Abstract
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809
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441
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Every thermodynamic quantity in the thermal equilibrium state can never bear large fluctuation.Specially, a criterion is proposed for the existence of the thermal equilibrium state in order to obey the requirement that both energy and entropy fluctuations must be small. Examples show that the number of particles 10^23 may be not large enough to guarantee the thermal equilibrium state for some systems at low temperature.
The condition of a family of equipotenlial surfaces and some examples
. 2008, 27(6): 3-3.
Abstract
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800
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(193KB) (
537
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The condition of a family of equipotential surfaces in electrostatic field is explained, and some examples are also illustrated.
Recursive matrix method of dyadic Green＇s functions for horizontally stratified media
. 2008, 27(6): 6-6.
Abstract
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769
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360
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A recursive matrix method is adopted for the computation of dyadic Green＇ s functions in horizontally stratified media with arbitrary number of layers. Three matrix equation groups for computing the coefficients of the Sommerfeld integrals are obtained according to the continuity condition of electric and magnetic fields across the interface between different layers, which are in correspondence with the TM wave produced by a vertical unit electric dipole and the TE or TM wave produced by a horizontal unit electric dipole, respectively. All the equation groups can be quickly solved via the recursive method. The dyadic Green＇s functions with source point and field point be- ing in any layer can be conveniently obtained by merely changing the position of the elements within the source term of the equation groups. The expression of the dyadic Green＇s functions provided by this paper is terse in form and does not have exponentially increasing term, so it does not overflow during computation.
Rotational inertia of an elliptical rigid body
. 2008, 27(6): 13-13.
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1153
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806
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The rotational inertia of an elliptical rigid body is calculated when it rotates around its vertical centrosymmetric axle by using the elliptical parametric equation and the rotational inertia formula
Trajectory of a charged particle moving in the crossed uniform electric and magnetic fields
. 2008, 27(6): 15-15.
Abstract
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852
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(296KB) (
1432
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The motion equation of a charged particle moving in the crossed uniform electric and magnetic fields is obtained. For some typical cases, the trajectories are given, the properties of the trajectories and appearance of the node are discussed.
A method for calculating off-axis field of axial symmetric and non-static current distribution
. 2008, 27(6): 18-18.
Abstract
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612
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(448KB) (
372
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Under the circumstances of axial symmetric and non-static current distribution, a method for calculating off-axis electromagnetic field is given by using Maxwell＇s equations and axial symmetry.
Fine structure constant and its physical significance
. 2008, 27(6): 24-24.
Abstract
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2144
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(160KB) (
611
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Fine structure constant is one of the basic physics constants, the origin of the meticulous construction constant is set forth, and the different physical qualities displayed under different conditions are also revealed.
Binding energy of hydrogen-like impurity in InAs/GaAs quantum dot
. 2008, 27(6): 26-26.
Abstract
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602
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437
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The binding energies of the ground state and the low-lying excited states of hydrogen-like impurity in a InAs/GaAs quantum dot are investigated by applying the effective mass approximation and the perturbation. In the two-dimensional polar coordinate, the electron Schrodinger equation is solved exactly in a parabolic confinement potential. The numerical results show that the binding energies of the ground state and the low - lying excited states of hydrogen-like impurity sensitively depend on the frequency of the parabolic confinement potential and the spectrum is shifted forward to the blue because of hydrogen-like impurites. These results are useful for designing and fabricating the QD devices.
The effects of n and l quatum numbers on radial wavefunction of bound electron
. 2008, 27(6): 31-31.
Abstract
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813
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(323KB) (
371
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The effects of n and l quantum numbers on radial wavefunction of H, K and K-like ion are studied by using the Hartree-Fork average self-consistent field（SCF） theory. Usually the core is very compact, and the wavefunction is found to be just as that of hydrogenic electron when n and l are large. The centrifugal potential prevents the electron from penetrating so far into the small r region of core, and the nodes position of radial wavefunctions is shown to remain essentially static with different n and l. In the region near the nucleus the centrifugal potential is so important that the electron with small l penetrates only slightly into the core region, the centrifugal repulsion will keep the large l electron at rather large radii. With increasing ionization, the effects of centrifugal potential become weaker oppositely, and the electron with any l can penetrate into the core region.
A maximum method for measuring surface tension coefficient
. 2008, 27(6): 35-35.
Abstract
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607
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531
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The relation between height of the liquid film and the tensile force in the process of metals thin slice to pull up the liquid film is measured. The reason of its creation is analyzed and a project about the liquid surface tension coefficient of accurate measure is given.
Research of three-dimensional multi-scroll chaotic circuit based on virtual instrument
. 2008, 27(6): 38-38.
Abstract
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611
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(487KB) (
513
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With the quickly development of virtual instrument technique, it provides a new approach for the research of nonlinear system. Three-dimensional multi-scroll chaotic system based on virtual instrument is designed. The experimental results of three-dimensional multi-scroll chaotic circuit system are presented. As the approach has been used, the result at the experimental system is satisfactory.
Size separation in vibrated granular matter
. 2008, 27(6): 42-42.
Abstract
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528
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(544KB) (
450
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Brazil-nut effect and its reverse in the vibration and the corresponding theories are shown. The deficiency of these theories is analyzed. Some suggestions for solving the problem existing in the theories are proposed.
The application of Lie algebra method in the research of molecular vibrational spectroscopy
. 2008, 27(6): 48-48.
Abstract
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552
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352
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Through the introduction of dynamical symmetry, the method of construct the Hamiltonian of the molecule is derived and the general method of dealing with ＂vibration-vibration coupling＂ and ＂vibration-rotation coupling＂ molecular spectroscopy are deduced. An example （HCO molecule） is induced to elucidate this method by choosing a certain group chain to construct Hamiltonian of this molecular system and illustrating that the group chain is unique. It also makes a principal introduction of some other applications of Lie algebra method in the molecular spectroscopy （e. g. local-mode, the spectroscopy＇of multi-atomic molecule） and elucidates some question of this method in the last of this paper.
Talk about the teaching material of 《 University physics》
. 2008, 27(6): 52-52.
Abstract
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780
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(287KB) (
525
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The ideas of writing the book of 《University physics》 and writing situation are introduced. Taking the goal of curriculum construction as a gruidance, the article elaborates in writing the book how to give prominence to scientific ideas and methods, how to combine theory with practice and how to display the whole material world around us, so that while as students learn physics knowledge, they can also take physics as a scientific quality education course to learn at the same time. The article also describes the treatments of several aspects of the book, such as the color version, the style of book, the textual descriptions etc. with referring to the foreign outstanding physics book, so that the new book have the characteristics of easy understanding, interesting and using friendly. This book not only facilitates teaching for teachers but also suits for students to independent learn and read.
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