College Physics

Electronic fractionalization

. 2016, 35(3): 1-1.

Abstract ( 1098 )

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The electron is a fundamental building block of nature. Its charge and spin degrees of freedom are indivisible in isolation. However,in some low- dimensional strongly correlated electronic systems,the interaction between electrons and other particles will lead to the emergence of two different quasiparticles. One of the new particles created,the spinon,carries positive charge and no spin,and the other,the spinon,carries the electron＇s spin. Such phenomenon is called spin- charge separation and adopted to explain high- temperature superconductivity. Recently,the existence of holon and spinon was verified in experiments. Also,an orbiton carrying the property,which arises from the electron＇s motion around the nucleus,was observed. In this article,combined with the progress in experiments,we describe these interesting phenomena.

Analysis of quantum concept based on optical polarization experiment

. 2016, 35(3): 5-5.

Abstract ( 951 )

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Quantum mechanics mainly describes the behavior of things at the micro scale. Many quantum phenomena are contrary to daily direct experience,so the basic concept of quantum mechanics is not easy to be understood by students in the course of teaching. Polarized light experiment is a common physical experiment,which is familiar to students,and the experimental phenomenon is intuitive. Focusing on the perspective of observable and measurement,this paper illustrates quantum concepts through the explanation of the phenomenon of optical polarization experiment. In this way,the abstract quantum concepts can be embodied in the analysis of the concrete experimental phenomenon,which will help students understand the basic principles of quantum mechanics.

Building of curl concept from scratch

. 2016, 35(3): 8-8.

Abstract ( 916 )

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Through the basic way and no use of Stokes＇ formula,the calculation formula of the surface density of circulation of the vector field is derived. It is pointed out that at the same point the surface density of circulation of the vector field f（ r,t） surrounding the different axis is different,the size ofΔ× f is equal to the maximum of the surface density of circulation,the direction of theΔ× f is along thus a axis when the loop winds this axis,the surface density of circulation maximize,the surface density of circulation that winding the axis n is equal to the weight of theΔ× f along axis n. Thus a vector fieldΔ× f is called the curl of f（ r,t）. A mistake is pointed out,that ones often make when they calculate the line integral which vector field is along a infinite short line segment.

Numerical simulation of geostationary satellite

. 2016, 35(3): 11-11.

Abstract ( 927 )

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In the theoretical mechanics framework,by considering the Coriolis force and inertial centrifugal force,the process of the drift,adjustment and synchronization of the geostationary satellite is numerically simulated. The exquisite technology for launching the geostationary satellite is understood and appreciated.

The projectile motion of diabolo with air friction

. 2016, 35(3): 15-15.

Abstract ( 1458 )

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Considering the interaction of friction in motion direction of mass center of projectile body,we have studied the motion of rotating projectile on Magnus effect. There is an exact solution of motion locus to present.

Problems involving infinite dielectric and related discussions

. 2016, 35(3): 18-18.

Abstract ( 1126 )

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We give analysis and discussion for an example of infinite dielectric in the thirteenth university student＇s physics competition in parts of the country. Here we provide a more thorough solution in detail. Since similar infinite dielectric examples widespread in college physics,it will provide some inspiration and reference from the discussion herein.

The magnetic field of a linear current and a big ferromagnetics plate with a semi elliptic cylindrical raised and its numerical simulation

. 2016, 35(3): 22-22.

Abstract ( 971 )

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The magnetic field of a linear current and a big ferromagnetics plate with a semi elliptic cylindrical raised is studied by using conformal mapping and magnetic images method. Its magnetic vector distribution and magnetic induction line equation are obtained. The magnetic induction line maps are plotted by using the software MATLAB.

The enveloping surface of optical fiber desk lamb

. 2016, 35(3): 27-27.

Abstract ( 992 )

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The shape equation of elastic rod in the gravity field is derived from the variation principle. The numerical result of critical length is given for the vertical optical- fibre bend. The enveloping surface of optical fiber is simulated. Dependence on the fiber length is also discussed.

Space-splitting in the one-dimensional hydrogen atom model

. 2016, 35(3): 30-30.

Abstract ( 1000 )

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The potential energy for one- dimensional hydrogen atom is usually modelled by- 1 / ｜ x ｜ over the entire space x∈（- ∞,∞）. Studies over years reach a consensus that the space is separated into two impermeably semi- infinite spaces due to the serious singularity of the potential. In the two spaces,there exist two independent one- dimensional hydrogen atoms.

A novel three- dimensional chaotic system analysis with invariable Lyapunov exponent spectrum and its circuit implementation

. 2016, 35(3): 34-34.

Abstract ( 958 )

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A novel three- dimensional autonomous chaotic system is constructed,which is the general structure of the Lorenz system,Chen system and Lü system. The dynamic properties of the new system are analyzed via Lyapunov dimension,Lyapunov exponent spectrum,bifurcation diagrams when system parameters vary. The Lyapunov exponent spectrum is locked when the parameters of the quadratic cross- product terms vary. The bifurcation diagrams and state variable evolutions of the locked chaotic systems show that the amplitude evolvement and the phase of the chaos signals can be modulated. Finally,the circuit of the new chaotic system is designed and realized by Multisim software,and results show a good agreement between theory analysis and circuit simulations.

Study for measuring Young＇s modulus with optical lever

. 2016, 35(3): 40-40.

Abstract ( 1439 )

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The traditional optical level of Young＇s modulus measuring instrument path light adjustment is very complex,but can be improved by laser replace the telescope and obtain a measurement on the gauge more convenient. At the same time,according to the spiral micrometer,we can word out it＇s magnification times,thus confirming the metal ware＇s small elongation. Comparing with the traditional measuring method of young＇s modulus,this method is not only convenient adjustment,but also intuitive and high accuracy.

The relationship between Stern- Gerlach experiment and electron spin and angular momentum orientation in space quantization

. 2016, 35(3): 43-43.

Abstract ( 3395 )

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Stern- Gerlach experiment plays a decisive role in the modern physics experiment. As far as the experimental method is concerned,the molecular beam method created by this experiment has influenced many important physical experiments. As far as the basic principle of quantum mechanics is concerned,it is an example of quantum state preparation and a successful example of some quantum measurement. Based on a large number of related literature research and the combination of physical principles and historical materials,we hope to restore the true historical facts of Stern- Gerlach experiment. The focus is on clarifying the relationship between the experiment and the orbital angular momentum space quantization and electron spin.

Teaching research on reciprocity theorem

. 2016, 35(3): 50-50.

Abstract ( 1058 )

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To help the students have a better understand and usage of reciprocity theorem,in this paper,we propose a reciprocity theorem table. Based on the four forms of the ports at reciprocity theorem and the equivalent circuit of two port network with pure linear resistance,we study the reciprocity theorem. It has been shown the instinct property of the theorem is the equivalent response between the reciprocity circuit and the reciprocal circuit.

The gravitational radiation under the roche limit

. 2016, 35(3): 54-54.

Abstract ( 1223 )

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This paper points out that a planet（ or a satellite） revolving around a primary star may generate a velocity component towards the star because of kinetic energy loss due to gravitational wave emission and,if the Roche limit of the planet with respect to the primary star lies outside of the star surface,the planet,driven by the velocity component towards the star,will ultimately approach the Roche limit,where it is ripped apart by the tidal force and where the gravitational radiation terminates. The author gives an equation for computing the time at which the planet is ripped apart. A computation example is given using Saturn in the solar system as the study subject,in which the time of its ripping apart by tidal force is computed as it approaches the Sun under the influence of gravitational radiation. This philosophy is further generalized to binary stars that revolving around each other and to comets.

Alfred Landé and the relations between Max Born and Alfred Landé

. 2016, 35(3): 56-56.

Abstract ( 996 )

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Alfred Landé was a good achiever as a theory physicists in 20 thcentury. In his scientific career,many times he was appreciated,helped and nurtured by Max Born. When Born was persecuted by the Nazis and lost his job,Landé did his best to help Born. What Born did to Landé was a special example of the things whichBorn did for scientific talents. That Landé learned something and did some excellent research works proved Born was a good developer. Born and Landé were modest men,and all wrapped up in their research works. The moving stories between them shown they were full of flesh and blood. Whether being a good man or doing things,they were the great example in the world of physics.

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