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Table of Content
20 August 2006 Volume 25 Issue 8
著者文摘
On the beginning of quantum mechanics 80 years ago
. 2006, 25(8): 1-1.
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As the author has the privilege of being associated with Born in Edinburgh during 1938--1941 and 1943--1945, and with Schroedinger in Dublin during 1941--1943 and 1945--1947, the beginning of quantum mechanics 80 years ago is described here with reminiscences, and also with an emphasis on the evolution of scientific ideas.
Brief introduction and research progress of plasma microwave radiation
. 2006, 25(8): 3-3.
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370
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The plasma microwave radiation, as a novel high power microwave （HPM） source, has gotten more attention in recent years for its merits of broadband, coherent emission and tunable frequency. Several typical theoretical researches and experimental investigations in this field, including electron beam-plasma interaction, plasma local perturbation, three-wave interaction, are introduced.
Different methods of calculating the electric potential of a uniformly charged ring
. 2006, 25(8): 7-7.
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1744
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Different methods of calculating the electric potential of a uniformly charged ring are described and discussed.
Imaging analysis of negative refraction materials to evanescent wave
. 2006, 25(8): 11-11.
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1154
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478
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The difference between the evanescent wave penetrating the lens made by the negative refractive material and the lens made by the refractive medium is analyzed. It realizes the phase adjustment, thus realizes wave focusing. Moreover, that the negative refraction material also amplifies evanescent wave oscillation amplitude is analyzed by using the principle of superposition （interference method） and the field quantity match law. The gain of negative refractive index medium for evanescent wave is obtained. The traveling wave and the evanescent wave all could focus the image formation. And it proposes that the evanescent wave penetrates the negative refractive material slab is equivalent to forming a LC oscillating circuit in the transmission line theory, and realizes the amplitude gain to the evanescent wave.
The radiation condition of laser synchrotron source
. 2006, 25(8): 14-14.
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953
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478
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Laser synchrotron source is a novel X-ray source. LSS is based on Compton scattering of intense lasers from relativistic electron beams. By Compton-recoil electron method, the wavelengths and energies from the laser synchrotron source are investigated. The results show that, for the different y ranges, the wavelength and energy have the different approximate formulas. Then, the radiation condition of the LSS is calculated as λ1 〉λm. At the last, the relation λ2max = h/（mo γv） and εc2max=βε3 are presented.
Can the photon be treated as a frame of reference？
. 2006, 25(8): 16-16.
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983
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576
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A problem ＂Can the photon be treated as a frame of reference？＂ in a textbook is answered briefly.
Numerical simulation of the charge distribution of finite conductor stick
. 2006, 25(8): 17-17.
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Applying the finite difference method, the numerical simulation of the surface charge density of a finite conductor stick is presented. It turns out that not only curvature radius of the conductor surface but also the shape of it and the other conductor around it have influences on its surface charge density.
Study on compound depolarization effect of wave plate and revolver
. 2006, 25(8): 20-20.
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741
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466
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Several depolarizers are introduced, and the depolarization mechanism of polychromatic light is represented in detailed. By using Stockes vector and Mueller matrix, the depolarization effect of polychromatic light through wave plate and revolver combination is analyzed, and the specific form of Stockes vector is gained. Some things of depolarization are discussed.
Extension of the Schr6dinger equation to the Dirac one by simple inference
. 2006, 25(8): 22-22.
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700
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590
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Based on the Schroedinger equation, the phenomenological description of spin and basic requirements of special relativity, the Dirac equation is attained by simple inference.
Deliberation of ＂The solution of the renormalization group of planar hexagonal crystal lattice Ising model＂
. 2006, 25(8): 24-24.
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935
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Something about （V）0 in the paper shown in the title are recalculated, new counter change of the renormalization group, linearization matrix thereof and critical indices.
On the concept of wave function phase factor ——A critique to the book ＂Quantum mechanics＂vol. Ⅱ chapter 4 by Zeng
. 2006, 25(8): 26-26.
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976
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A number of misconceptions in a current text of quantum mechanics by J. Y. Zeng in Chinese are pointed out and analyzed in addition to previously criticized points .
On the quantum phase factor and quantum adiabatic theorem —— Reply to the comment by H. Z. Li
. 2006, 25(8): 29-29.
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899
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The comments on the quantum phase factor and quantum adiabatic theorem by H. Z. Li are shown to be inconsistent with the real-world cases and thus incorrect. It is shown that the condition R/ t→0 cannot account for ＂why the quantum adiabatic theorem does not hold for the energy degenerate case＂ ,and can lead to the erroneous statement that ＂the wave function without the adiabatic phase factor satisfies the time-dependent Schroedinger equation＂.
The improvement of the experiment of Young＇s modulus by pulling and stretching
. 2006, 25(8): 33-33.
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892
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829
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In order to measuring the small variation of the steel-wire＇ s length, a leveling bench of high precision is made with laser, reflector, etc. The small variation of the steel-wire＇s length can be obtained by measuring the displacement of leveling bench with micrometer. The improved device is scientific and highly accurate, to be understood easily and mastered by student.
The experiment of evolvement and control for Coullet chaotic system
. 2006, 25(8): 36-36.
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894
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369
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The experimental circuit of Coullet chaotic system is structured. As the parameter of Coullet system is changing, the bifurcate process form the steady periodic state to chaotic state is observed by using oscillograph. The system is effectively controlled via nonlinearly feedback. As the value of feedback gain is changing, the system can form chaotic state to the steady periodic state.
Determination of the cardinal point of a compound optical system using lateral magnification
. 2006, 25(8): 40-40.
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693
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465
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The theory and method of using lateral magnification to determine the cardinal point of compound optical system are introduced. Since CCD is used, the high measurement precision is obtained.
To improve the general quantity of physics talent by using multiple teaching means
. 2006, 25(8): 42-42.
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977
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What has been done in undergraduate teaching by the national base of talent training for basic research and teaching in physics in Nankai University is presented. Multiple teaching means are used to increase students＇ learning initiative. Enhancing research training has improved the general quantity of physics talent. The experience and accomplishment is also discussed.
C. T. R. Wilson＇s experimental researches on his cloud chamber
. 2006, 25(8): 46-46.
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710
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A brief account of C. T. R. Wilson＇ s main contributions and the course of inventing the cloud chamber are given. How he began from the researching of the law of drop＇s forming,improved his experimental apparatus continuously, photographed the tracks of charged particles and provided experimental conformation of the Compton effect are reviewed. Several important factors which made Wilson successes are analyzed.
Experimental study of nanosecond pulsed waveform in gas discharge
. 2006, 25(8): 52-52.
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679
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323
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The oscillograph tests the surge waveform of the first order discharge loops of the alternating current arc generator. Nanosecond pulsed waveform is observed in the main surge waveform. Experimental and analytical methods have been adopted in the study of the nanosecond pulsed waveform, which are supposed to provide a new experimental approach in the studies of nanosecond pulse in gas discharge.
Motion of charged particles in earth magnetic field
. 2006, 25(8): 56-56.
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900
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The motional characteristic of charged particles in geomagnetic field discussed by numerical simulation. The locus of the particles is given. By analyzing the motion, the magnetic bottle effect of geomagnetic field and van Allen radiation belt are explained.
Discussion of an electric image problem using group theory
. 2006, 25(8): 59-59.
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730
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567
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A sort of electrostatics problem that using electric image method to solve the electric field in the wedge area between two infinite earthing metal boards are discussed using group theory. The conditions under which a solution exists and a general distribution of image electric charges are given. Finally the conditions on which the deduction of the distribution is based are necessary and sufficient conditions to apply electric image method to this problem is proved.
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