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    05 January 2024 Volume 42 Issue 12
      
    Testing and assessment of calculus-based Newtonian mechanics  teaching and learning
    XU Ming-jiao, FENG Fu-yang, CHEN Lan-xin, ZHANG Mei
    College Physics. 2023, 42(12):  1.  doi:10.16854 /j.cnki.1000-0712.230164
    Abstract ( 263 )   PDF (876KB) ( 311 )  
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    Most college students have difficulties in learning physics.In order to improve the quality of teaching，this paper starts with the analysis of test scores of Newtonian mechanics as part of the course—Fundamental Physics using SPSS software.The test scores come from two exams: one is Force Concept Inventory，and the other is the teacher's selfdesigned calculus-based Newtonian mechanics quiz.Descriptive statistics，normality test，difference test and correlation analysis were carried out on the scores of Class 06 of the course in Grade 2022 students at Beijing Normal University.Based on the analysis of specific test questions，it is concluded that students are easily confused with related knowledge，poor in the application of theoretical knowledge in physical situations，and low in the mastery of mathematical tools such as calculus.In view of the above problems，some teaching suggestions are put forward.



    A Typical MOOC Case Chosen By The Joint Meeting of Online Open Course Alliances In Universities
    Li Xiao-wen
    College Physics. 2023, 42(12):  11.  doi:10.16854 /j.cnki.1000-0712.230409
    Abstract ( 101 )   PDF (747KB) ( 143 )  
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    This article introduces the innovativeness of the MOOC “Experiments in General Physics—Optics”，which is chosen as a typical case by the joint meeting of online open course alliances in universities to celebrate MOOC decade in China.
    Principle and applications of frustrated total internal reflection
    SHAN Xi-chen, DING Ruo-yu, SUN Xu-bo, ZHANG Wen-kai
    College Physics. 2023, 42(12):  13.  doi:10.16854 /j.cnki.1000-0712.230225
    Abstract ( 218 )   PDF (945KB) ( 164 )  
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    Total internal reflection is the phenomenon which light is reflected totally on the surface when light is incident from a dense medium to a thin medium at an angle greater than critical angle. In total internal reflection, evanescent waves are generated on the side of the thin medium. Evanescent wave is a surface wave that propagates along the surface of media and its amplitude decreases exponentially with the increase of penetration depth. When the medium of the third layer with a higher refractive index than the second layer gets close to the boundary between the first and the second layer, the medium will interact with evanescent waves in the second layer, resulting in partial light reflected by total internal reflection at the interface of the first and second layer penetrating into the third layer medium, and this phenomenon is called frustrated total internal reflection. In recent years, frustrated total internal reflection has been applied in many fields and has attracted extensive attention. In this paper, firstly evanescent wave and frustrated total internal reflection and theories of them are introduced briefly, and the relationship between transmittance and width of the thin medium, refractive index of medium and incident angle are simulated by MATLAB. Secondly, two experimental schemes to verify the frustrated total internal reflection and some applications depending on in several fields are shown.


    Finite-Element-Method simulation of chiral WGM microcavities
    ZHANG Wei-yuan, YU Xiao-chong
    College Physics. 2023, 42(12):  18.  doi:10.16854 /j.cnki.1000-0712.230179
    Abstract ( 112 )   PDF (996KB) ( 153 )  
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    Optical whispering gallery modes possess ultra-high quality factors and small mode volumes, making them an important platform for fundamental optical physics and photonics research. However, common optical WGM microcavities often have mirrored invertion symmetry, which limits the utilization of their polarization degrees of freedom and thereby restricts their ability to distinguish chiral materials. In this article, we introduce chiral materials into the microcavity, and analyze the polarization property of the WGM. We also establish an effective finite-element-method framework to simulate chiral material, providing a powerful tool for chiral photonics research.

    A comparative study of optics of college physics teaching in chinese and french universities
    AN Wei
    College Physics. 2023, 42(12):  22.  doi:10.16854/j.cnki.1000-0712.230178
    Abstract ( 93 )   PDF (857KB) ( 143 )  
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    As the basic education part of elite education in France, physics teaching in French college preparatory courses has unique characteristics and reference significance. This article takes optics teaching as a specific example, and reveals the similarities and differences by comparing the basic requirements of college physics teaching in China and France. Similarities: Both emphasize that the essence of physics courses is to carry out scientific paradigm training and scientific literacy development, and efforts should be made to stimulate students' self-consciousness and initiative. The difference: the French teaching content discards the diffraction part and guarantees a more thorough explanation of the remaining part. At the same time, the French side divides the geometric optics and wave optics into two years of teaching, which is quite different from the Chinese side.


    Analysis and simulation of vortex dynamics in  asymmetric artificial superconducting structures
    DAI Qing-qin
    College Physics. 2023, 42(12):  28.  doi:10.16854/j.cnki.1000-0712.230174
    Abstract ( 104 )   PDF (1002KB) ( 145 )  
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    In this paper, the dynamics of vortices in superconductors is investigated by analytical model and numerical simulation. Firstly, the vortex dynamics model is established, and the analytical solution is obtained and plotted. Then, on this basis, the interaction force of vortices is considered, and the influence of Lorentz force, cycle length and number of vortices on the overall motion effect of vortices is explored by MATLAB numerical simulation combined with Newton method. Finally, the Ornstein-Uhlenbeck process is used to simulate the thermal noise, and the numerical solution of Langevin equation is obtained by Splitting method and the velocity-period image is drawn, so as to realize the simple simulation of vortex dynamics in superconductor.

    Gravitoelectric field, gravitomagnetic field and gravitational wave
    HE Xiao-kai, CAO Zhou-jian
    College Physics. 2023, 42(12):  33.  doi:10.16854/j.cnki.1000-0712.230128
    Abstract ( 156 )   PDF (837KB) ( 215 )  
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     In many textbooks, gravitational waves are described as perturbations of flat spacetime. Under the weak field approximation, gravitational interactions can be described in a similar form to the Maxwell equation, corresponding to the concepts of gravitational electricity and gravitational magnetism. The weak gravitational field naturally corresponds to the perturbation of flat spacetime. Due to the fact that gravitational waves, gravitational electricity, and gravitational magnetism can be described as perturbations of flat spacetime, it is interesting to ask the relationship between gravitational waves, gravitational electricity, and gravitational magnetism. The analysis in this article indicates that gravitational electricity and gravitational magnetism correspond to the behavior of the near region of the gravitational source, but cannot describe the wave behavior in the far region. That is to say, the gravitational electricity and gravitational magnetism commonly used in literature cannot describe the behavior of gravitational waves. 

    The development of the Beijing Normal University Physics Tournament and its role in cultivating top innovative talents
    LI Jia-hong, LIANG Ying, MA Yu-han
    College Physics. 2023, 42(12):  37.  doi:10.16854/j.cnki.1000-0712.230168
    Abstract ( 147 )   PDF (885KB) ( 188 )  
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    Since its inception in 2010, the China Undergraduate Physics Tournament (CUPT) has gone through 13 years of development and is currently the most influential undergraduate physics competition in China, with nearly 200 universities participating annually. Beijing Normal University (BNU) was one of the earliest universities to participate in CUPT and launched its own campus-level physics academic competition (BNUPT) in 2011. This paper provides a systematic review of the development of the PT series competitions at BNU and their role in cultivating top innovative talents in the physics department. Based on this, possible future development directions for the PT series competitions at BNU are proposed, including: 1) moving from intra-campus to inter-campus exchanges; 2) utilizing social media platforms to promote and exchange information on optimizing competition models, addressing competition topics, and related teaching research; 3) combining BNUs talent cultivation philosophy in research-oriented teachers to build an innovation talent cultivation bridge between university and high school stages based on the Physics Tournament (PT) model and practicing and promoting the PT educational model in basic education.

    Transltor,s afterwords and tribute to professor Liang Canbin ———Penned for the English edition publication of Differential Geometry  and General Relativity (Volume 1)
    Jia Wei-zhen
    College Physics. 2023, 42(12):  55.  doi:10.16854/j.cnki.1000-0712.230397
    Abstract ( 237 )   PDF (1181KB) ( 169 )  
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    From the translators perspective, this article recounts the whole process of planning and preparing the English edition of Differential Geometry and General Relativity (Volume 1) up to its publication. It recollects my interactions with Professor Liang Canbin during this period, serving as a remembrance and heartfelt tribute to the esteemed Professor Liang.

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