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- Energy and Wigner functions of the Dirac oscillator in noncommutative phase space
- LV Tengbo, LIU Li, LIU Weihua, LI Xin, WANG Xiaoli,
- College Physics. 2020, 39(01): 1-4. doi:10.16854 / j.cnki.1000-0712.190294
- Abstract ( 1069 ) PDF (253KB) ( 467 )
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- Bohr hypothesis to luminescent mechanism
- ZHAO Lijuan
- College Physics. 2020, 39(01): 5-8. doi:10.16854 / j.cnki.1000-0712.190166
- Abstract ( 1230 ) PDF (800KB) ( 923 )
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- The moment of inertia of ring and torsional ring with elliptic cross section
- YU Feng-jun, TIAN Jun-long, TANG Zhen-jie, ZHANG Xi-wei
- College Physics. 2020, 39(01): 9-11. doi:10.16854 / j.cnki.1000-0712.190067
- Abstract ( 1529 ) PDF (512KB) ( 674 )
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- Clearing up the misunderstanding about the principle of relativity and covariance of equations
- ZHAO Kai-hua
- College Physics. 2020, 39(01): 12-13. doi:10.16854 / j.cnki.1000-0712.190405
- Abstract ( 1265 ) PDF (338KB) ( 813 )
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- Thinking about a typical mechanical problem
- WANG Xiao-ying, WANG Ming-li, HOU Yan-xue
- College Physics. 2020, 39(01): 14-17. doi:10.16854 / j.cnki.1000-0712.190014
- Abstract ( 1148 ) PDF (554KB) ( 581 )
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- Teaching application of dimensional analysis in the thermodynamics part of college physics
- LAN Shan-quan, CHEN Jian-ming
- College Physics. 2020, 39(01): 18-22. doi:10.16854 / j.cnki.1000-0712. 190205
- Abstract ( 1007 ) PDF (193KB) ( 545 )
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- Deriving laws of geometrical optics using symmetry principle
- NIU Dong-mei
- College Physics. 2020, 39(01): 23-25. doi:10.16854 / j.cnki.1000-0712.190139
- Abstract ( 1345 ) PDF (497KB) ( 521 )
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- A further discussion on application of coherent state in the ordering of quantum operators
- XU Ye-jun, LI Chao, AN Jing
- College Physics. 2020, 39(01): 26-28. doi:10.16854 / j.cnki.1000-0712.190038
- Abstract ( 1102 ) PDF (185KB) ( 598 )
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- A simple calculationand application of the Fermi level of non-degenerated semiconductors
- HUANG Hai-meng, WANG Chang-wang, XIAO Lin-hao
- College Physics. 2020, 39(01): 29-32. doi:10.16854 / j.cnki.1000-0712.190177
- Abstract ( 3631 ) PDF (320KB) ( 1942 )
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- In-depth study of chaos in a nonlinear dynamical system
- LI Ming-da, YUAN Zhe-cheng, LUO Duan-bin
- College Physics. 2020, 39(01): 33-37. doi:10.16854 / j.cnki.1000-0712.190009
- Abstract ( 1250 ) PDF (1772KB) ( 1019 )
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- Simulation design of the swinging ball
- MENG Yong
- College Physics. 2020, 39(01): 38-44. doi:10.16854 / j.cnki.1000-0712.190133
- Abstract ( 1453 ) PDF (2155KB) ( 846 )
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- Theoretical and experimental study of the relation between refractive index and concentration of sucrose solution
- XU Fei, ZHU Jiang-zhuan, GAO Yun-jing, ZHENG Hu-lin, LI Zhong-chao, ZHU Yi-ran
- College Physics. 2020, 39(01): 45-47. doi:10.16854 / j.cnki.1000-0712.190220
- Abstract ( 3029 ) PDF (557KB) ( 1126 )
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- Two methods for measuring grating constants in grating diffraction experiment
- JIN Fang-zhou
- College Physics. 2020, 39(01): 48-52. doi:10.16854 / j.cnki.1000-0712.190066
- Abstract ( 2944 ) PDF (832KB) ( 760 )
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- The mathematic model and numerical simulation of swing with parametric self-excited oscillation
- YANG Bai-yu, WANG Cui-xiang, WANG Bin-ke, LI Chun-wang, FAN Qi, TIAN Chang-hui
- College Physics. 2020, 39(01): 53-56. doi:10.16854 / j.cnki.1000-0712.190080
- Abstract ( 1162 ) PDF (880KB) ( 706 )
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- Exploration on the reform of basic physics experiment teaching based on professional differences—Taking the example of Anhui University of Technology
- LI Cheng-long, SHENG Zong-qiang
- College Physics. 2020, 39(01): 57-60. doi:10.16854 / j.cnki.1000-0712.190059
- Abstract ( 960 ) PDF (474KB) ( 731 )
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- An analysis of the innovation production issued by college students in the specialties of physics，science and technology———Data based on the articles in “The Scope of Students”of “College Physics”from 2010
- WEI Hui-ling, MA Chun-wang, WU Qi-wen, SHI Ya-jie
- College Physics. 2020, 39(01): 61-65. doi:10.16854 / j.cnki.1000-0712.190236
- Abstract ( 1043 ) PDF (1890KB) ( 344 )
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- Research on the chaos phenomena of Lorenz water wheel
- CHENG Nai-han, CHENG Min-xi, LI Chun-lan, LIN Mo-di, YANG Shang-zhao
- College Physics. 2020, 39(01): 66-70. doi:10.16854 / j.cnki.1000-0712.190047
- Abstract ( 1962 ) PDF (1718KB) ( 961 )
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- Thermodynamic properties of Berthelot fluid and parametric solutions
- LI Dan-dan, MI Li-qin, CHENG Qing-cheng, LING Fang-he
- College Physics. 2020, 39(01): 71-76. doi:10.16854 / j.cnki.1000-0712.190182
- Abstract ( 1120 ) PDF (607KB) ( 1113 )
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With the development of noncommutative geometry，string theory and loop quantum
gravity theory，he noncommutative space has been made more and more concerned.
The noncommutative quantum theory is different from the ordinary quantum
theory，which is a special physical effect under the string scale.
Therefore，special methods are needed to deal with noncommutative quantum
mechanics problems. In this paper，the Moyal equationand Wigner function first
are introduced. Starting from Moyal-Weyl multiplication and Bopp
transformation，H(x，p)is transformed into H^ (x^ ，p^ )by considering the
noncommutability of coordinate-coordinate，momentum-momen tum to realize the
star-multiplication eigenequation in the non-commutative phase space. The
algebraic relationship of noncommutative phase space quantum mechanics is used
to discuss the Wigner functions and energy levels of Dirac oscillator in
noncommutative phase space. The results show that the energy level of the Dirac
oscillator in the non-commutative phase space is obviously dependent on
non-commutative parameters.

Light is an electronicmagnific radiation in the range of violet to
infrared.Luminescence is light radiation except thermal radiation.Luminescence
is the theoretical fundation for design luminescent materials and its
applications.In this work，based on Bohr hypothesis，energy levels and transition
of isolated atom in vacuum and inantivacuum are analysized and the luminescent
mechanism is induced.Quantum cutting and up-conversion lumines cence of
non-isolated atoms are investigated by energy transfer of atom at excited
state.And it is found that the atomic excieted state energy transfer is a key
for understanding luminescence.The students follow the advance of lumines cent
physics by introducing Nobel prize that is relative with luminescence.We get
overstep from fundament knowl edge to science border in the college physics.

The mathematical models of rings and torsional rings with elliptical cross
section are established.According to the definition，the moment of inertia and
the product of inertia about three coordinate axes are calculated. The
calculation process is simplified by making full use of the symmetry of the
section figure. Some useful conclusions and results are obtained.

Some authors confirm that the energy of a physical system conserves in an
inertial frame of referencemust do so in any other frames. Actually they have
confused the covariance of equations with the principle of relativity. The
present article attempts to clear up this misunderstanding.

A typical mechanical problem is analyzed in this paper. A heavy ball is hanged below the ceiling by a rope，and another rope is tied at the bottom of the ball. If the end of the rope moves at a certain velocity，which rope will snap first. The results show that when the moving speed v is less than a certain critical speed Vc，the rope above the ball snaps first. Which rope snaps first when the speed exceeding Vc is decided by the maximum tensile force that the rope can sustain. The rope under the ball snaps first when the speed v>>Vc .

This paper briefly introduces the homogeneous theorem and the Π theorem in dimensional analysis，

and then specifically cites the teaching application of dimensional analysis in the thermodynamics part of college

physics. Our solution process is：analyzing and listing the possible physical quantities;writing a dimension table of

all physical quantities;analyzing the dimension table，determining the relevant physical quantities and independent

dimension;setting the dimensionless quantity equation;listing and solving the dimension index equations.

The space and time symmetrical properties of optical wave and the medium have
been analyzed. According to the symmetry principle the time translation
symmetry and some of the space translation symmetry have to be preserved during
light propagation，reflection and refraction processes，and the three geometrical
optic laws of rectlinear propagation law，reflection law and refraction Snell’s
law are derived. The symmetrical analysis here explicit that the symmetry
principle is of fundamental importance and is the basement governing the optical
processes.

The S-ordering expansion of density operator of coherent state is obtained by means of the generalized Weyl quantization scheme. Based on this S-ordered expression and the technique of integration within S-or-dered product of operators，we derive the S - ordering forms of some quantum operators (including normally ordered，Weyl ordered and antinormally ordered product of operators). The proposed method further expands the application of the coherent state on the ordering of quantum operators.

Based on the teaching practice of semiconductor device physics，a simple law between the carrier

concentration and the Fermi level from the Boltzmann statistical law of non-degenerated semiconductor is summarized in this paper. When its carrier concentration is changed by one order of magnitude，its corresponding Fermi level should change by 60 meV. In order to understand this law deeply，this paper analyzes and calculates the important parameters，such as the quasi-Fermi level in non-equilibrium state，the work function of semiconductor，the threshold voltage of an MIS structure and the built-in potential of a PN junction. This facilitates students not only to deepen their perceptual knowledge in the process of mastering the physical knowledge of semiconductor devices，but also to develop and enhance the ability in analyzing and designing semiconductor devices.

A kind of nonlinear chaotic pendulum system is introduced into the experiment
teaching.By adjusting the period of the driving force of the chaotic
pendulum，the process of chaotic phenomena appearing in the nonlinear dynamic
system is demonstrated so that students can understand the basic characteristics
of chaotic phenomena，such as parameter sensitivity，phase diagram
characteristics，spectrum characteristics and so on.In order to further
under-stand the characteristics of the chaotic pendulum，a simplified dynamic
equation of the nonlinear pendulum system is established and studied
numerically.The numerical simulation based on dynamic equation overcame the
difficulties of quantitative change of experimental parameters，difficult control
of swing stability and long experimental period.In the numerical simulation，the
related characteristics of the chaotic pendulum is described in detail by
changing the phase diagram，spectrum diagram and bifurcation diagram obtained by
different parameters，which is also helpful for students to deepen their
understanding of the chaotic pendulum.

The swing of the object is one of the most basic forms of motion in nature，and it is also one of the

basic contents in the mechanics course.Under the guidance of Newtonian mechanics and Lagrangian mechanics，the

mathematical calculation software Maple's powerful calculation and graphic functions are used to analyze and calculate the problems in the large-angle single pendulum，double pendulum and the Foucault pendulum motion under resistance.The simulating animations made by Maple are accurate and vivid，and reflected the physical laws of the pendulum movement.At the same time，it realizes the purpose of visual teaching.

The propagation of light in the medium follows Fermats principle.In homogeneous medium，lightpropagates along a straight line，and in inhomogeneous medium，the propagation trajectory of light is more complex.In this paper，taking sucrose solution as the research object，the experiment of light propagation in inhomogeneous medium is designed，the related model is established，and the relationship between the refractive index of the solution and the concentration is analyzed theoretically.The gradient expression of refractive index of solution is obtained by fitting the data.

Diffraction gratings can separate the light of different wavelengths
spatially，which have graduallyreplaced prisms for application in most areas of
spectral analysis.Measuring the grating constant by grating diffraction is a
typical experiment in the experiment of college physics.This paper introduces
two interesting phenomena found during the grating diffraction
experiment：(i)there is a minimum diffraction angle when rotating the grating
angle，and (ii)when the grating is rotated to a certain angle，the diffracted spot
will gradually disappear into the field of view.Then，we analyze and explain
these two phenomena in theory，and we design two methods for measuring grating
constants.Moreover，we verify these two methods in experiment.Compared with the
traditional method of measuring the grating constant with the minimum deflection
angle，this paper analyzes the influence of the position deviation of the minimum
deflection angle，and proposes a method of symmetric rotation measurement to
further reduce the error.

The swing is regarded as a variable length simple pendulum. Based on the normalized Gauss function，the velocity of pendulum ball relative to pendulum rod is designed. On this basis，the nonlinear dynamic differential equation of swing is established，and the motion of swing is simulated numerically based on this mathematic model，the motion，work and energy transformation mechanism of swing are obtained.

Taking Anhui University of Science and Technology as an example，the practice of
the basic physicsexperiment teaching reform based on professional differences is
briefly introduced. Especially，the new measures put forward in content reform of
physics experiment course in this university. These measures involve the
classification of experimental contents，the supplement of experimental contents
and the resolution of " divergence" of experimental contents. Through the
implementation of these specific new measures，the teaching level of the physics
experiment course and the students' enthusiasm for learning the physics
experiment course are both improved.

Based on the publications issued in column of “The Scope of Students”of “College Physics”from

2010，the articles for innovation research done by college students in specialties of physics，science and technology

are analyzed. The main characteristics of the innovation activities have been obtained. The results are helpful to

guide the innovation research activities for college students in the new era of higher education in China.

Lorenz water wheel is a model to describe the chaotic system. The movement equations are analyzed

and a Lorenz water wheel is set up. The video analysis software tracker is used to trace the motion of the water wheel

recorded by a mobile phone. The corresponding physical images，such as phase diagrams，are drawed quickly and

easily. Both the chaotic attractor and the initial value sensitivity have been found. Then the system has been proved

to be a chaotic system by analyzing several experimental images.

This paper is devoted to the study of thermodynamic properties on the Berthelot fluid. The Helmholtz

free energy，entropy，Gibbs function，internal energy and enthalpy of monoatomic Berthelot fluid are derived;the

parametric solutions of the Berthelot fluid two coexisting phases are obtained，and phase diagrams，thermodynamic

behaviors near the critical point and associated properties are discussed by using the parametric solutions. The study

provides analytic theory of thermodynamics and phase transition for substances satisfying the Berthelot fluid.