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Table of Content
20 September 2015 Volume 34 Issue 9
第一段
Einstein and the birth of the special relativity-- The 110th Anniversary of the theory of special relativity（continue）
. 2015, 34(9): 2-2.
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Einstein＇s great contribution in setting up the special relativity is introduced. The special relativity departs from classical physics through the postulate of the constancy of the velocity of light in empty space. Einstein is the first one who proposes the ＂principle of the constancy of the velocity of light＂ , and he is also the first person who recognizes that ＂relativity of simultaneity＂ and meanwhile abandons the concept of Aether. Einstein is the sole founder of the theory of special relativity.
著者文摘
The shape invariance of the superposed potential of the power functions
. 2015, 34(9): 7-7.
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868
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532
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Using super-symmetric quantum mechanics arguments, the superposed potentials of the power functions of two kinds satisfying the property of shape invariance are found, and their energy eigenvalues are calculated. Harmonic oscillator, Coulomb and Kratzer potentials are the examples of the superposed potential of the power functions, their energy levels are obtained via the superposed potential of the power functions.
Solving the static magnetic field with magnetic charge magnetized magnetic media theory perspective
. 2015, 34(9): 10-10.
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960
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678
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The theory of magnetization of the magnetic medium magnetic charge is very convenient and simple manner to solve the one point of static magnetic field. The magnetizing current of the magnetic field distribution is calculated on the basis of the magnetizing current of a special distribution of steady divergent current-infinite circle plane magnetic field. We have found a new methodological approach for solving steady current magnetic field through the analysis of these issues discussed.
Two equivalent solutions to the static universe condition of Friedmann model
. 2015, 34(9): 12-12.
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In the standard universe model Friedmann model, the analytic relation between mass density and cosmological constant density of the static universe condition is a basic relation, which defines the No-Big-Bang region. The classical solution derives the relation by eliminating the curvature and scale factor from the Friedmann equation. The whole process is complex, We find an equivalent solution which can reach the same result easier. The new solution converts this question into a mathematical extreme problem by considering the value range of physical parameters and makes the process more directly.
Equivalent resistance between any two nodes in an infinite globe network
. 2015, 34(9): 15-15.
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954
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443
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The Study on the equivalent resistance of resistor network is constantly making progress, but there are still some unresolved problems. The equivalent resistance between any two nodes in a finite globe network has been solved. However, the equivalent resistance between any two nodes in an infinite case has not yet been solved. This paper, by taking the limit method, gives three integral formula for the equivalent resistance between any two nodes in the infinite globe network. Three specific examples are given as simple application of this method.
A comparative study of energy levels in ＂W＂ type wells
. 2015, 34(9): 19-19.
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930
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The energy levels are calculated by using finite different method with Matlab language in two ＂W＂ type wells, which one is parabolic （WI type） and the other is triangle （WII type） in wells. The results have shown that when the middle-potential barrier （ Vb） is fixed, the value of each level increases with increasing edge-potential barrier （Vo） , the split begins with the higher level, then the lower levels. In comparison with WI type, a previous split for the higher levels in WII type can be seen as V0 is increased. The opposite case appears for an in- creasing value of Vb and a given value of V0 as well as for simultaneously increasing values of Vb and Vo. The smallest two levels in WI type are stable as the value of Vo/Vb varies. The level value in WII type is larger than the corresponding level in WI type under the same potential barriers. This shows that there is a stronger coupling in WI type in comparison with WII type. The results may provide some theoretical references for the band design of double quantum wells.
Solution of modified formula for energy level one in Stark effect of three-dimensional hydrogen atom
. 2015, 34(9): 23-23.
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1188
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563
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A general formula for three-dimensional hydrogen atom Stark effect is simplified. The modified formula for energy level one of any state energy in three-dimensional hydrogen atom Stark effect is given.
Improvement of flat parabolic motion demonstrator
. 2015, 34(9): 27-27.
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1128
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663
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In view of the inquiry experiment of horizontal projectile motion in High School Physics Teaching Edition Compulsory 2, the paper points out the disadvantages in the experience device for the teaching material demonstration, and improves the demonstration apparatus of the horizontal projectile motion. After the improvement, the movements of the horizontal projectile motion at the horizontal direction and vertical direction can be observed visually. The new instrument breaks through the main points and difficulties in the teaching of horizontal projectile motion. The instrument is operated simply, and the demonstration effect is obvious.
Investigation on the conservation of momentum of collision on the plain by using the video analysis software tracker
. 2015, 34(9): 31-31.
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1347
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The collision of two glass spheres on the plain is recorded and analyzed by the video analysis software Tracker. By measuring the displacement and velocity of the collision spheres, the problem of measuring two or more objects in two-dimensional motion at the same time is resolved. Consequently, the law of conservation of mo- mentum can be verified and the coefficient of restitution can be calculated in this experiment of collision.
Weak electrostatic field sensor using electrostatic force deflection of a vibrating micro-spring supported membrane
. 2015, 34(9): 35-35.
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933
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597
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An electrostatic field sensor is shown by using a vibrating micro-spring supported membrane as the sensing element. The sensing mechanism involves electrostatic force to deflect the membrane, and a photoelectric sensor to measure membrane movement based on the laser reflected amplification method. A bias voltage applied to the membrane can be used to increase measurement sensitivity. Electrostatic field is detected by measuring the deflection of equilibrium position of the membrane. It is presented for the measurement of de electric field. Measure- ment error is about 3% for a 1V/mm de weak electrostatic field. The application of this sensor is for weak electric field monitoring.
An overview of the history of Otto Stern experiment
. 2015, 34(9): 39-39.
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1100
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In view of the incomplete narrative of the Otto Stern experiment in current college physics teaching material, the paper summarizes the experiment through experimental background, experiment contents and the late development status of the experiment, respectively. Its influence on the development of the physics is mentioned.
Analysis of lightning-induced voltage on an overhead line
. 2015, 34(9): 44-44.
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960
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The horizontal and vertical electric fields due to nearby lightning are calculated adopting the transmission line model. And lightning-induced voltages on an overhead line are evaluated by using the coupling model proposed by Agrawal et al. Finite difference time domain method is adopted in calculation of both fields and lightning-induced voltages. The distribution rule of lightning-induced voltage on an overhead line is obtained.
MOOC is not a newborn thing but has a newborn strength -- Talking several thoughts about MOOC
. 2015, 34(9): 48-48.
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920
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Since the second half of 2012, MOOC has spread quickly and widely across China. So, what impacts does it have on traditional higher education？ By reviewing the history of online education and discussing the fundamental laws of education, I try to show that MOOC is not a newborn thing, but it has a newborn strength. Even though MOOC cannot change the underlying form of education, it does have a significant influence on our educational concept, methodology and consumption ideas. In this paper, I also discuss several educational views about MOOC teaching,pointing out the flaws existing in these views.
Calculation for moment of inertia fractal body
. 2015, 34(9): 52-52.
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996
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474
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The center of mass and moment of inertia of generalized Koch curves are calculated from the self- similarity property of fractal body.
Comprehension of crystal symmetry and symmetric operation based on the CrysalMaker software
. 2015, 34(9): 55-55.
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1071
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Crystallography plays an important part in a wide range of disciplines, including physics, materials science and technology, chemistry, mineralogy, biology, as well as engineering. Crystal symmetry and symmetric operation require students having the spatial-visualization and imaginary skills, are the keystone and difficulty of the cryptography teaching. To overcome this, in this paper we introduce in some 3D crystal demonstrations based on the CrystalMaker software for the teachers and students, it will make teaching and learning of crystal symmetry much easier.
Of the Born and the series of research of the school——How did Born teach and supervise outstanding physical figures？
. 2015, 34(9): 59-59.
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In the late 1920s to 1930s, Max Born established his physical school in Gtittingen. Born had culti- vated a galaxy of outstanding physical figures in 20th century, Born also wrote several physical books which are called the Bible in especial field by physicists, these books have profound effect on physicists from generation to generation. How did Born established his school？ Why Born＇ s school could get so many achievements in the fields of researching work and supervising students ？ Who as a very known physicists ever were Max Born＇ s students or assistants ？ How many books by Max Born have profound influence and what are they？ The answers are all in the paper. Part one of it introduces the outstanding physical figures whom were cultivated by Max Born, and also shows the process in which Max Born built his school. Part two of the paper gives the examples to show the successful method that Born instruct different student by different way, introduce several classical physical books wrote by Max Born, and the important influence gave to young physicists in 20th century by these books of Born.
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