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Table of Content
20 September 2009 Volume 28 Issue 9
著者文摘
Thermodynamic stability and single-particle distribution function in quantum system at nonzero temperature
. 2009, 28(9): 1-1.
Abstract
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892
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(383KB) (
456
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By exploiting the stability of quantum dot system and applying Klein inequality, we prove that, at nonzero temperature, the single-particle distribution function of this system is a non-increasing function of the single-particle energy. This result shows that the electronic properties of a quantum dot system are largely determined by its thermodynamic stability.
On particle probability density operator and probability current density operator
. 2009, 28(9): 5-5.
Abstract
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1617
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(379KB) (
1481
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The discussion by Ref. [ 1 ] on the particle probability density and probability current density opera- tors are augmented, and the probability and probability current in the general space （ e. g. momentum space） are clarified. Also mistakes in Ref. [ 1 ] about these concepts are pointed out and analyzed.
Study of oscillation of single pendulum system
. 2009, 28(9): 9-9.
Abstract
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884
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(451KB) (
1639
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A general solution for the motion of single pendulum system and the equation for its eigenfrequency are given by solving the boundary value problem of equations for vibration of string, in which the tension is variation. The numerical solutions with high accuracy for the period of single pendulum system are obtained using the eigenfrequency equation. A fitting formula for the period of the system being in base-frequency vibration with high precision in the macro-range is found out.
Further discussion on forced oscillation pattern of A2 B model
. 2009, 28(9): 13-13.
Abstract
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842
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(250KB) (
292
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The resonant solution on forced oscillation of A2 B model is given and the modes of vibration on resonant frequency are discussed.
A special analysis for a heterotypic domino
. 2009, 28(9): 16-16.
Abstract
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925
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(334KB) (
525
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The size of a heterotypic domino, space, and the amount of released energy are discussed.
Two kinds of expressions and their equivalence of the force on the projectile in coilguns
. 2009, 28(9): 19-19.
Abstract
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835
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(276KB) (
1136
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There are expressions of two kinds about how to calculate the magnetic force accelerating the projectile in coilguns. However, the inductance gradient expression had been quoted incorrectly by many researchers. It is necessary to demonstrate them correctly and prove their equivalent relation. In this paper, these problems are solved perfectly on the base of several physics principles.
Calculation of the electric field and capacitance of a confocal elliptic capacitor
. 2009, 28(9): 22-22.
Abstract
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848
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(225KB) (
695
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The electric field and capacitance of a confocal elliptic capacitor are calculated by the inverse hyperbolic cosine analytic function, and discussion on them is performed.
Study of the acoustic-optic Naman-Nath diffractive characteristic
. 2009, 28(9): 25-25.
Abstract
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960
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(293KB) (
828
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The form mechanism of ultrasonic grating is discussed and the acoustic-optic effect is Naman-Nathdiffraction in ultrasonic grating experiment in liquid base on the distinguish standard of acoustic-optic effect types.The diffractive stripe azimuth of acoustic traveling wave and acoustic standing wave are determined by the same diffractive equation, and the intensity of diffractive stripe is determined by the value of J^2m（v）. Finally, the distriburing characteristic of diffractive stripe and diffractive intensity are given.
Exact solution for new kind of double-well potential and periodic potential
. 2009, 28(9): 28-28.
Abstract
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834
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(337KB) (
616
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We propose an approach to obtian the analytical solution for a new kind of potential constructed by some pieces of solvable potential if their general solution could be obtainde. We exactly solved two kinds of potentials constructed.by this method, one is a double-well potential and adother is a periodic one, both of them are smoothly joined by pieces of quadratic potential curves.
Investigation of saturation magnetostriction coefficient of amorphous ribbon by means of small angle magnetization rotation with a self-made instrument
. 2009, 28(9): 32-32.
Abstract
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892
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(387KB) (
773
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The measurement and a self-made instrument of the saturation magnetostriction of amorphous ribbon by the small angle magnetization rotation （SAMR） method are investigated. Dependence of the voltage of the second harmonic wave on alternating current and applied frequency is measured. Under the optimal measurement condition, the saturated saturation magnetostriction coefficient （As） of FeFe65～70Co15～20Si1～3B12～15, amorphous ribbon is measured and the λa of 1.74×10^-5 is obtained.
Measurement of film＇s magnetic parameters based on the principle of surface magneto-optic Kerr effect
. 2009, 28(9): 36-36.
Abstract
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808
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(375KB) (
1233
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Based on the principle of surface magneto-optic Kerr effect, the magnetic parameters of film mag-netic material can be measured. The Kerr angle of NiFe material is measured experimentally and the magnetic hysteresis loop is plotted.
Discussion on the measurement of the thermal expansion coefficient of liquid by using optical interference
. 2009, 28(9): 39-39.
Abstract
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986
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PDF
(289KB) (
660
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The refractive index of liquid is related to the density of liquid, the density of liquid is related to thetemperature of liquid based on a general refractive index equation of transparent material. It is easy for measuring the temperature dependence of the refractive index of liquid by using optical interference. The thermal expansion coefficient of liquid is obtained and the formulas of refractive index of liquid is discussed.
Improvement of Zeeman effect experiment based on LabVIEW
. 2009, 28(9): 42-42.
Abstract
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943
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PDF
(539KB) (
1264
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An approach to improve the Zeeman effect experiment is introduced by using LabVIEW. To capture ex-periment images, the ActiveX is used in the LabVIEW, and digital image process technology is applied to reduce many interferers in the experiment images. The computer aided measurement in the charge-mass ratio of electron and the difference in wave numbers are realized. The measure accuracy is improved and the teaching effect is enhanced.
Some new advances in stochastic resonance studies
. 2009, 28(9): 46-46.
Abstract
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840
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(504KB) (
1028
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The important directions and new advances in stochastic resonance studies are discussed. The stochastic resonance studies of linear harmonic oscillator are describe in detail.
Calculation and graphics of electron cloud in hydrogen atom
. 2009, 28(9): 51-51.
Abstract
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1709
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(445KB) (
1547
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This paper introduces the basic methods of Monte Carlo and progressive scan for plotting the electroncloud in hydrogen atom. Three dimensional electron cloud at different states is visualized at different views by using the software of MATLAB. This can let the teaching of probability density of electron in hydrogen atom more intuitionistic.
Multi-mode optical digital holographic system for experimental teaching
. 2009, 28(9): 55-55.
Abstract
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996
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PDF
(378KB) (
468
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A modern multi-mode optical digital holographic system for experimental teaching is developed. Thesystem establishes and records frequency field of digital holograms by combining CCD technique with various optical alignments, and uses different mathematical algorithms and computing programs to realize entirely numerical reconstruction of the hologram as well as three-dimensional measurement to the reconstructed images. The principle and process of digital holographic imaging can be demonstrated in detail via the designed interface of the operation software.
Proof of cycle theorem in electrostatic field by methods other than offset
. 2009, 28(9): 59-59.
Abstract
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923
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PDF
(170KB) (
459
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The cycle theorem in electrostatic field is an important theorem in physics. The sole method to deduce itin all text books is that of offset. Two other methods than offset will be given in the present paper, which are more simple and skillful. Since this theorem is quite fundamental, it is quite attractive to physics teaching to seek for different proofs.
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