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Table of Content
20 December 2009 Volume 28 Issue 12
著者文摘
Algebraic solution of three-dimensional two-particle Calogero-Sutherland module
. 2009, 28(12): 1-1.
Abstract
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745
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(412KB) (
518
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The operator system of three-dimensional twoparticle Calogero-Sutherland module（CSM） is obtained by sing the pseudo-angularmomentum operator method（PAMOM）;the symmetry of spectrum space is then investigated.The normalized eigenfunction and the analytical expression of Glauber coherent state are obtained.
Influence of air resistance on a falling body defecting eastward
. 2009, 28(12): 5-5.
Abstract
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860
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(276KB) (
705
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By using Matlab software programming,the value of eastward drift of a falling body is calculated in the condition of air resistance.In comparison with the condition of no air resistance,our result shows that air resistance decreases the value of eastward drift of a falling body,which clears up the incorrect viewpoint that air resistance increases the value of eastward drift of a falling body.
The effective electromagnetic parameters of planar layered media
. 2009, 28(12): 8-8.
Abstract
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772
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581
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For small electric thickness planar layered medium and electromagnetic waves in normal incidence,the effective permittivity and effective permeability of the middle layers media equivalent to one are obtained based on the boundary conditions.This is an effective approach to analysis problem of electromagnetic waves propagation in multilayer media.
The demagnetizing factor and demagnetizing field of ellipsoid material in uniform magnetic field
. 2009, 28(12): 10-10.
Abstract
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1938
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1513
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In the ellipsoidal coordinate system, the magnetizing problem of ellipsoid magnetic material in uni- form magnetic field is solved. The analytical expressions of magnetic scalar potential and magnetic field in the entire space, as well as demagnetizing factors and demagnetizing field in the material are obtained. The relation between the shape of ellipsoid material and the demagnetizing factors as well as the influence of the material susceptibility on the direction of demagnetizing field are studied. It is found that the demagnetizing factor along the longer axis of el- lipsoid is less than that along the shorter one. As the magnetizing field is along the ellipsoid axis or the material is sphere, the demagnetizing field is parallel with （ along or opposite to） the magnetizing field. For ferromagnetic ma- terial, the demagnetizing field is almost opposite to the magnetizing field.
Stone skipping and physics
. 2009, 28(12): 16-16.
Abstract
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1267
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(253KB) (
766
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The motion of a stone skipping over a water surface is one of human s most ancient games.A simplified description of the collisional process of the stone with water is proposed.The stone s bounce is happened when the initial velocity of a throw surpasses a marginal value.The maximum number of bounces is estimated.
A simple proof for Onsager s reciprocity relation
. 2009, 28(12): 19-19.
Abstract
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2441
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(326KB) (
1178
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The Onsager s reciprocity relation takes the important role in the development of linearity nonequilibrium thermodynamics.The relation reduces difficulties and workload in experiment analysis so as to offer possibility to definite the phenomenological coefficient.This paper proofs the relation from independent variables：temperature,volume and temperature,number of particle,and investigates entropy production rate physics innate character,respectively.
The rotational inertias of uniform rotational rigid surfaces about the around axis
. 2009, 28(12): 22-22.
Abstract
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871
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(245KB) (
956
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According to the definition of rotational inertia,the rotational inertias of uniform rotational rigid surfaces about the around axis are obtained,and the rotational inertias of some special uniform rigid surfaces such as the drum surfaces,the vase surfaces,the frustum cone surfaces,the circular cone surfaces and the cylindrical surface are also discussed in this paper as special examples.
Perturbation of helium atom in momentum representation
. 2009, 28(12): 25-25.
Abstract
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780
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(157KB) (
409
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Basing on the perturbation theory,we calculate the energy shift of ground state of helium atom in the momentum representation,also both in two and three dimensional spaces with column like potential.
The electric field of a linear charged inside a thin cylindrical conductor
. 2009, 28(12): 26-26.
Abstract
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915
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(328KB) (
455
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The electric potential distribution and electric field intensity distribution of a linear charged inside a thin cylindrical conductor are calculated by using the conformal mapping on the coordinate system of the complex number,and the equipotential line and electric field line maps are plotted by using the mathematical software MATLAB.
Calculation of ionization potential of hydrogen-like ions
. 2009, 28(12): 30-30.
Abstract
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1455
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1019
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Based on an amendment of ionization potential in hydrogen-like ions in terms of the theory of relativity and interaction of electron spin-orbit,we take into account the effect of the nuclear volume and the nuclear mass for the ionization potential.Some ionization potentials in hydrogen-ions are calculated.Our results are in well agreement with the experiment data.The present method can make up the deficiency of other methods.
Research and practice on the ultrasonic Doppler effect experimental system based on digital storage oscilloscope
. 2009, 28(12): 33-33.
Abstract
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872
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PDF
(389KB) (
688
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An ultrasonic Doppler effect experimental system based on the digital storage oscilloscope is intro- duced. This system uses the existing ultrasonic sound velocity measurement equipment. With the shift signal pro- cessing circuits and digital storage oscilloscope as the data measurement unit core, and through coordinating with the system base and the movement control unit, a number of integrating and designing experiments related to the Doppler effect can be carried out. The students＇ understanding to Doppler effect and it＇s application can be deep- ened. The conversion, transmission and processing of signals in the experiment are clear and transparent, which will help in-depth to train students＇ abilities in autonomous practical and observing and analyzing problems. With- out complex software programming, the experimental system is simple and every laboratory can complete it on their own production, at the same time, the experiments can realize the sharing of resources, improve the equipments＇ utilization with higher value of practical utility and promotion.
Development of magnetic random access memory
. 2009, 28(12): 36-36.
Abstract
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1006
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(306KB) (
976
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The basic principle of magnetic random access memory（MRAM） is analyzed,the property with static random access memory（SRAM）,dynamic random access memory（DRAM） and flash are compared,and the application prospect of MRAM as the next generation memory is discussed.
Multiplier effect of pulsed electric field-mediated plant negative air ion launched and its significance
. 2009, 28(12): 39-39.
Abstract
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834
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PDF
(426KB) (
852
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The paper introduces NAI（negative air ion） at the physical concept and the role of air purification and discusses its source in air under the normal ecological conditions.The experimental results and mechanism are analyzed and the pulsed electric field can cause the plant to have the NAI launch multiplier effect.
Make students experience the spirit of scientific exploration in physics courses to improve their cognition and train the physical logic thinking ability
. 2009, 28(12): 43-43.
Abstract
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882
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PDF
(566KB) (
1006
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Physics is a course aiming to train the logic thinking ability. In physical researches, many scientists have experienced tough and effective explorations to search for scientific knowledge. In our classes, as teachers, at appropriate time we can tell the students how the scientists exploited, including their thinking methods, and experi- mental processes. In this paper we give the examples of wave-particle duality, Farady law of electromagnetic in- duction, exploration of space, to show the thinking methods and experimental processes, from which, we let the students know the scientific exploration process. It is a good way to improve their cognition, excite their study inter- ests, master correct thinking ways and scientific methods, and develop their creative abilities.
Analysis and implementation on the magnetic levitation of diamagnetic substances
. 2009, 28(12): 48-48.
Abstract
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1036
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(186KB) (
1127
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We have tried to prove and show that magnetic flelds do have put repellent force on ＂nonmagnetic＂materials such as graphite and copper.In our experiment,we have tried several permanent arrays,and finally found a four-block permanent magnet array to produce a gradient field,and get the stable regions for levitation above the permanent magnets.We successfully make graphite to be levitated.We also use the paramagnetic solution and electromagnet to realize more obvious levitation for Al2O3 and Si.
Study of fractal dimension and conductance of Cu samples with electrolytic deposition process
. 2009, 28(12): 50-50.
Abstract
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890
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(430KB) (
474
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Fractal structures of Cu sample are prepared with electro-deposited method.The fractal dimension and the conductance of the samples under different voltages are calculated.It is found that the fractal dimension increases and the conductance decreases with increasing voltage.
A comprehensive and researchful experiment project for the measurement of Young＇s modulus
. 2009, 28(12): 54-54.
Abstract
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903
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(428KB) (
761
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The Yang＇s modulus is obtained by the measurement of free vibration frequency of a cantilever with damping. During the process, some comprehensive and researchful knowledge are concerned, which include force sensor, Wheatstone bridge, digital oscilloscope, computer interface, fast Fourier transform and LabVIEW virtual instrumentation.
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