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Table of Content

    20 September 2013 Volume 32 Issue 9
      
    著者文摘
    Thinking in physics teching
    . 2013, 32(9):  1-1. 
    Abstract ( 733 )   PDF (1187KB) ( 830 )  
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    In the study of physics, it is important to grasp the most important things. Physics is a level, there are different rules, simply have different levels, different interaction laws. Together, is our physics. In the new century, not only for the purpose of treatment for physical, but also to take the initiative close to major national needs, and strive to physical applications in various fields. Such learning physics, there will be great help to our country to improve the innovation capacity. The physical teaching should have new thinking, teaching materials should also adapt to the characteristics of physics in the new century. The goal of training, only a few people who specialize in physics, and most people may be related to the physical application. On the teaching system, each school should decide the outline and teaching hours to according to the school' s characteristics. To attach importance to experimental teaching, not weakened laboratory. Teaching materials are not unified, teaching materials not in many, but in characteristics. The key of teaching is students play their own advantages, arouse students' perception. The heuristic for the students, to inherit the sense, in accordance with the actual situation to be inspired, rather than give him a ready to accept either course, vague things. Should incorporating the new development and application into teaching, to stimulate students' interest. Add some popular history of physics teaching, physics and astronomy is full of philosophy, is full of dialectical materialism, the students in the view of the universe in the actual formation, plays an important role, also should be the content of quality education.
    How to develop students'programming abilities for computation with MATLAB in courses of computational, physics?
    . 2013, 32(9):  9-9. 
    Abstract ( 795 )   PDF (675KB) ( 888 )  
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    The programming is a basic skill for beginners to learn courses of computational physics and an elemental teaching task for courses of computational physics. The textbook of computational physics should provide programs as examples to elucidate coding skills. In programming training, we ought to focus on methods as well as the corresponding teaching plan.
    Analytic calculation of Landau levels of the two-dimensional massless Dirac electron
    . 2013, 32(9):  15-15. 
    Abstract ( 1302 )   PDF (258KB) ( 895 )  
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    Based on the elementary concepts of quantum mechanics, the Landau levels of the two-dimensional massless Dirac electron in monolayer graphene are calculated analytically within the Landau gauge and the symmetric gauge by means of special functions theory. The results show that the Landau level spectrum in the system is distinctive from that in the conventional two-dimensional electron gas.
    Discussions on electrostatic equilibrium problem of series parallel conductor plates
    . 2013, 32(9):  18-18. 
    Abstract ( 824 )   PDF (457KB) ( 428 )  
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    Both equivalence principle and superposition principle are adopted for discussing electrostatic equilibrium problem of series parallel conductor plates. The physical meanings about the mathematic resuhs are also studied. We have pointed out that plates can be divided into some classic and basic partitions according to the boundary condition; each partition can be solved very easily. The problem of this type can be transformed to very simple situation that only contains two plates by using integral method.
    Some uppering and lowering operators in algebraic approach of quantum mechanics
    . 2013, 32(9):  23-23. 
    Abstract ( 1057 )   PDF (446KB) ( 629 )  
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    We use expressions of the operators in spherical coordinates to show the specific process of operators uppering or lowering eigenstates.
    One-dimensional infinite square well in second quantization
    . 2013, 32(9):  28-28. 
    Abstract ( 857 )   PDF (256KB) ( 348 )  
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    In second quantization formalism, finite-N truncation is applied in solving one-dimensional infinite square well problem. The results show that square of the well width parameter a2 is proportional to the truncation parameter N. When N is large enougn( N ≥ 1 000) , results from the finite-N truncation, at least for low-lying states, are in good agreement to those of exact solution.
    Discussion on two problems in Atomic Physics
    . 2013, 32(9):  31-31. 
    Abstract ( 638 )   PDF (270KB) ( 736 )  
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    Two problems in 《Atomic Physics》 written by YANG Fu-jia are discussed in detail. Some questions and different viewpoints are putted forward in the process. The results are different from the answer in the book and also different from the answer in 《Assistant Book to Study Atomic Physics》 written by LV Hua-ping and LIU Li.
    A deduction method for the Lorenz transformation
    . 2013, 32(9):  33-33. 
    Abstract ( 1347 )   PDF (149KB) ( 532 )  
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    Based on the principles of relativity and constant speed of light, a concise yet rigorous derivation for the Lorentz transformation is given.
    Weak electric field measurement based on torsion balance method
    . 2013, 32(9):  35-35. 
    Abstract ( 781 )   PDF (339KB) ( 384 )  
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    A weak force of static electric field coming from weak electric field is used to make torsion balance device cause small angle of deflection, and then an optics plane mirror amplification is used to make small angle change into a horizontal displacement. Through the comparative method of this kind, the measurement of weak static electric field less than 1 V/mm is realized, the phenomenon is visual and the results are reliable.
    An experimental design for inverse square law between T-rays intensity and distance
    . 2013, 32(9):  39-39. 
    Abstract ( 1418 )   PDF (345KB) ( 643 )  
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    The detector has a certain geometric structure. If the radiation intensity of different distance directly is measured, the result should deviate greatly from the theoretical value. In the test of the experiment for inverse square law between γ-rays intensity and distance, a suitable collimator for the detector can reduce efficiently the influence of the incident angle difference of γ-rays which can bring the distance measuring uncertainty, which improves greatly the accuracy of result. We use Monte Carlo method to design the experiment and collimator and use simulation experiment to determine the radius, thickness, aperture size of the collimator. Finally, we conduct the experiment with the collimator of this kind, detector and radioactive source, test whether it accords with the inverse square law.
    Andrade' s three Chinese students --The study about achievements of Y S Chiong, L C Tsien and Y S Chow
    . 2013, 32(9):  43-43. 
    Abstract ( 1002 )   PDF (869KB) ( 448 )  
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    Y S Chiong, L C Tsien and Y S Chow studied in University College London successively from 1930 to 1940, researched fluid mechanics and solid state physics respectively under the guidance of the same director, i. e. , E. N. da C. Andrade, a British physicist and achieved significant results. The academic achievements during the study abroad had a major impact on their later achievements and contributions, and also promoted the development of China' s physics.
    Evolution based on the model of tri-axial ellipsoid in the rotational binary system
    . 2013, 32(9):  51-51. 
    Abstract ( 858 )   PDF (430KB) ( 290 )  
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    By using the model of the tri-axial ellipsoid and theoretical calculations of un-uniform wind loss, the evolution of the rotational binary system is simulated numerically and analyzed. The results have shown that the time of the beginning of mass transfer phase and the central hydrogen-burning phase advanced, the main sequence is wider, the evolution track in the HR diagram shifted towards lower luminosity, a large amplitude of bluer track is caused, the radius has periodic expansion and contraction in the slow mass transfer process, and the angular momentum loss rate is smaller.
    A physics teaching method based on modern technology: TEAL
    . 2013, 32(9):  56-56. 
    Abstract ( 764 )   PDF (301KB) ( 318 )  
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    This paper introduces the basic ideas of a technology-based active learning method, i. e. , TEAL (technolgy enabled active learning) , and analyzes its teaching philosphy and its role in physcs teaching, then in- vestigates its feasibility of its application in physics teaching in China.
    The general solution of the resistance between two arbitrary nodes in an infinite square lattice
    . 2013, 32(9):  58-58. 
    Abstract ( 1072 )   PDF (329KB) ( 502 )  
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    We study the resistance between two tegral and get the general solution of the resistance arbitrary nodes in an infinite square lattice by mathematical inbetween two arbitrary nodes of the coordinate axis. Then we draw the contour line of the resistance to the origin and find out that this line is close to a circle. Finally, we give an approximate formula to calculate the equivalent resistance between two arbitrary nodes in the plane.