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Table of Content
20 August 2011 Volume 30 Issue 8
著者文摘
Analysis and simulation study of the apparent images of underwater objects
. 2011, 30(8): 1-1.
Abstract
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671
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276
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The explanation of the apparent image of an underwater object is a topic which seems simple but is often confusing and mistaken.The systematic study and simulations have been made on this problem.The results have corrected some popular mistakes about this matter,and indicated that generally the apparent position,size and shape of the image of an underwater object will change under different conditions,and this change is often beyond one＇s intuitional expectation.This work has also provided an excellent example for developing the learners＇ ability of creative thinking and solving practical problems.
Discussion about ferromagnetic mean-field theory in two quantum models
. 2011, 30(8): 5-5.
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848
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264
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The ground state phase transition from the paramagnetic state to the ferromagnetic state is studied via the mean-field approach both in electron gas with long range Coulomb interaction and atom gas with short range interaction.The properties of phase transition are obtained and the differences between the two models are compared.
Spin orbit coupling effect and its application
. 2011, 30(8): 9-9.
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1381
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1682
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We discuss the physical origin of spin-orbit coupling and introduce two different kinds of spin-orbit coupling effects.We also study how the conductance is manipulated by the spin-orbit coupling in magnetic tunneling junctions.
The location of the earth satellite projectile point in its parabolic and hyperbolic orbit and the comparison of three types orbits of the satellite
. 2011, 30(8): 13-13.
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1063
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534
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In this paper,we present a detailed analysis about the parabolic and hyperbolic orbit of the earth satellite,and the location of the satellite projectile point in its parabolic and hyperbolic orbits.A comparison of three types orbits of satellite is also given.
A case open to question in demonstration of mechanical energy conservation
. 2011, 30(8): 18-18.
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752
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384
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The mechanical energy conservation in the two independent descending and ascending processes for a YO-YO or a rotating-wheel pendulum is pointed out,but it is false to consider that the mechanical energy stays the same at the turning point of its lowest position,because of ignoring the energy loss caused by system jump effect.This mistake has long been existed in teaching,textbooks and all kinds of other books,worthy of being brought to the forefront.
The classical characteristics of movement of one-dimensional quantum forced oscillator
. 2011, 30(8): 22-22.
Abstract
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750
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327
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The one-dimensional classical forced oscillator is quantized.The exact solution of time evolution operator of the system is obtained.The quasi-probability distribution function of phase space is used to investigate the quantum characteristics of one-dimensional forced oscillator.The results show that the Wigner function is two-dimensional Gaussian wave packet from the initial vacuum state.The central coordinate and momentum of the Gaussian wave packet move in the same manner as one-dimensional classical harmonic oscillator.The amplitude and phase of the centre of the wave packet are modulated by the force.
The electric fleld of a line-charged and a grounding half infinite conductor
. 2011, 30(8): 25-25.
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1108
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526
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The formed electric fleld of a line-charged and a grounding half infinite conductor is calculated by using the methods of mirror and conformal mapping on the coordinate system of the complex number,and the distributions of electric potential and field intensity are given.In further,the equations of electric field line and equipotential line are also obtained.The maps of electric potential and equipotential lines are plotted by using the software MATLAB.
The energy of anisotropic Heisenberg ferrimagnetism system in spin waves calculated by invariant eigen-operator method
. 2011, 30(8): 30-30.
Abstract
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614
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516
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The spin waves energy of X-Y-Z model-anisotropic Heisenberg ferrimagnetism system is calculated by the invariant eigen-operator method,and the spin waves energy of such system under especial qualification and advantages or deficiencies of invariant eigen-operator method are discussed.
Development and application for experimental apparatus of magnetic circuit law
. 2011, 30(8): 33-33.
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621
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490
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The experimental principles,contents and methods of an apparatus of law of magnetic circuit are introduced.The relationship between the series and parallel of magnetoresistance and magnetic flux Φ,and relative magnetic permeability of（non-） ferromagnetic material are conveniently measured by the magnetic flux Φ influence on input current of the apparatus.The characteristics of some magnetic materials are compared and analyzed.Also the parallel law of magnetoresistance and phenomenon of magnetic flux leakage are investigated,and a series of application experiments also offer teaching application.
A demonstration device of solar magnetic suspension based on linear Hall-sensor
. 2011, 30(8): 36-36.
Abstract
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728
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673
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A demonstration device of solar magnetic suspension is introduced by using the electro-magnetic theory,mechanical and electronic technologies.This instrument is powered by solar energy,designed with integrated linear Hall sensor to probe the suspended object＇s displacement,and quantitatively displays automatic adjustment of the electromagnet＇s magnetism through digital tube voltage display circuit,which can accurately and visually demonstrate the physical phenomenon of magnetic suspension.The structure of this instrument is simple,stable performance,ease to operate,can be widely used in classroom demonstration,curriculum design and other situations,and thus we can obtain a good teaching result in practical applications.
Real-time measurement of temperature characteristic for high power white LED supplied by constant current source or constant voltage source respectively
. 2011, 30(8): 40-40.
Abstract
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682
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389
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A fast response thermometer is designed by using a pt100 surface mounted resistor.The effect of temperature on the photoelectric parameter of a high power LED supplied by a constant current source or a constant voltage source respectively is investigated real-timely by using the thermometer,which has less measurement error and higher measurement efficiency.The experimental results show that when the LED＇s temperature rises,the luminous intensity of the LED increases under the constant voltage source and decreases under the constant current source,and the luminous efficiencies of the LED all decrease under the both sources.
Thinking and practice on the model of composing the experiment textbook
. 2011, 30(8): 43-43.
Abstract
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630
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476
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Composing an excellent experiment textbook plays a vital role in the practice to perform the cultivating modes of innovative capacity.In this paper,the negative influence of the present traditional experimental teaching books on training students＇ innovation idea is analyzed firstly.The reform of composing the novel experiment teaching material is proposed.After more than ten years of practice,it has been proved to be rational and feasible.
The value reconstruction of university physics demonstration experiments
. 2011, 30(8): 46-46.
Abstract
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671
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(591KB) (
464
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In the perspective of innovation education we renew the understanding of physical demonstration experiment and reconstruct the values of demonstration experiments in innovative education,situated teaching design,innovation capability evaluation and science popularization.We pay equal attention to the ability of doing and creation,raise the innovation ability gradually by intrinsic motivation and external excitation.With optimizing the existing demonstration experiments,we establish a series of experiments with the situated teaching method.In order to select suitable students,we have designed appraise experiments.We carries on the popular science using the unique superiority of demonstration experiment.
Comparing and analyzing the physical teaching in Chinese and overseas medical education
. 2011, 30(8): 51-51.
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656
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352
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By investigation on medical education paradigms in the Chinese and overseas and comparing the physical teaching in medicine from different countries,we analyze the basic situations.Finally,we provide significant ideas for the reform of Chinese medical physics teaching.
Reflections and practice of carrying humanistic education to college physics teaching
. 2011, 30(8): 55-55.
Abstract
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643
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(428KB) (
431
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The impetuosity of examination-oriented education reduces the teaching to a problem-solving instruction which loses its spiritual meaning,such instruction may be an alienation power for students.To prevent such alienation,one way is to bring back the original humanistic meaning of teaching.That is to change the self-losing and substance-blindness teaching to a heart and mind devoted teaching.Skills to Tao and knowledge to feelings are the generalization in methods for carrying humanistic education to college physics teaching.
Energy spectrum equation of deformed harmonic oscillator potential
. 2011, 30(8): 59-59.
Abstract
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765
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307
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Three kinds of deformed harmonic oscillator potentials are given： left and right part with different parameters,left square potential and right harmonic oscillator potential,harmonic oscillator potential plus delta potential.The eigen-state of these potentials can be expressed in terms of the Hermite function.The energy spectrum equations are derived from the matching condition of wave function and its first derivative at origin.
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