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Table of Content
20 April 2014 Volume 33 Issue 4
著者文摘
The operation in occupation particle number representation（fermion）
. 2014, 33(4): 1-1.
Abstract
(
1942
)
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(220KB) (
812
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The operation in the wave function is operated tion particle number represen by tati occupation particle number representation for the total operation for many-particle system. Angular on for Fermi system is given. Fermi system is discussed while momentum operation in occupation particle number representation for Fermi system is given.
Dimension alanalysis and its application based on Mathematica
. 2014, 33(4): 3-3.
Abstract
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532
)
PDF
(362KB) (
1195
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A method of dimensional analysis is established in a systematic way through dimensional analysis in the theorem of linear space. By using the new function providing by scientific computing software Mathematica 9,the dimensional analysis is convenient and feasible.
Static magnetic field of rotating cylindrical body charged uniformly
. 2014, 33(4): 6-6.
Abstract
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1375
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PDF
(229KB) (
966
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From the cylindrical function expansion and properties of special function, the static magnetic field of rotating cylindrical body having limited length charged uniformly is calculated in the system of cylindrical coordinates, and the result is also discussed.
Quasistatic magnetization of the superconducting ball in uniform magnetic field
. 2014, 33(4): 9-9.
Abstract
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954
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(258KB) (
971
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Based on the Meissner effect of superconductor and the uniqueness of the Boundary value of the magnetic field in ordinary physical knowledge scope, the magnetized current and distribution of the magnetic field of the surface of the superconducting ball are calculated.
Theoretical calculations and experimental tests of magnetic field at any point of symmetric axis of parabolic current
. 2014, 33(4): 11-11.
Abstract
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851
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(321KB) (
552
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The equation of magnetic induction in parabolic current at any point of its symmetric axis is derived by using the Biot-Savart law and its graph is also drawn by the software Mathmatica. The equation is verified by our experiment with high sensitivity Millitesla Meter.
A simple approach for solving nonlinear telegraph equation
. 2014, 33(4): 15-15.
Abstract
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1000
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PDF
(241KB) (
1054
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The tanh-coth method is used for constructing the traveling wave solutions of nonlinear telegraph equation. These solutions include solitary wave solutions and trigonometric function periodic wave solutions. It is shown that the tanh-coth method is simple,effective and can be used for many other nonlinear equations.
Determination of Young＇s modulus of metals
. 2014, 33(4): 18-18.
Abstract
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1205
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PDF
(363KB) (
505
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The length of metal wire changes under the action of tensile force, the tiny changes of the metal wire length makes its resistance tiny changes at the same time. Using the principle for double bridge measuring low Ohm value resistance to measure the tiny variation of metal wire resistance, we calculate the Young＇s modulus of metal wire by using the corresponding formula, This method is simple and accurate.
Analyzing the damped vibration of spring oscillator on air track by software Tracker
. 2014, 33(4): 22-22.
Abstract
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1102
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PDF
(816KB) (
967
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By the automatic tracking function of the software Tracker, the damped vibration of spring oscillator has been tracked effectively. The displacement-time curve is depicted in the real time. The vibration equation and envelope equation are fitted by the fitting function of the software. The damping coefficient of air track is calculated. The phase diagram can be obtained by the function of coordinate transformation.
Investigation on wind power generation in physics experiment teaching
. 2014, 33(4): 25-25.
Abstract
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958
)
PDF
(741KB) (
833
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Using the developed experimental apparatus of wind power, we set up the wind power experiment content in experiment teachings of college and modern physics. It has been shown that the content is novel, students interest, thus which can be convenient and intuitive understanding of the whole process of wind energy conversion and utilization. Many factors that influence efficiency of wind power, which leave students thinking of wind power, improve their comprehensive quality.
Study of measurement of polarized light based on angle sensor
. 2014, 33(4): 29-29.
Abstract
(
879
)
PDF
(975KB) (
579
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The original mechanical reading dial is replaced by high precision angular transducer, silicon photovoltaic cells are used to receive the light intensity distribution, the angle sensor is used to receive the digital display changes electrical signals of the angle and intensity distribution of polarized light. Experimental apparatus of polarized light show visually the changes in light intensity waveform and digital readout. Meanwhile,the design of the experimental apparatus for polarized light measurement experiments can achieve high accuracy requirements.
CCD supersaturated aberration analysis method based on pinhole diaphragm
. 2014, 33(4): 33-33.
Abstract
(
825
)
PDF
(669KB) (
497
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It is a major problem to observe and analyze the geometrical aberrations of optical systems comprehensively and accurately in the fields of optics and optical design. A novel method of observing and analyzing the optical system aberrations,CCD supersaturated analysis method based on pinhole diaphragm,is proposed. In addition to the laser light source in the open optical path,the analyzing pattern with CCD supersaturated effect and zone dividing by calibration aperture are used in this method. With easy to understand and operate,abundant pattern information, obvious pattern phenomenon and low cost, the method not only facilitates the analysis and observation of geometric aberrations of optical systems but also sheds important light on the corresponding research of optical systems.
A wonderful phenomenon presented in space-teaching on Shenzhou-lO ：space lens of water-film
. 2014, 33(4): 37-37.
Abstract
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1441
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PDF
(906KB) (
982
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By experimental observation and theoretical study for the demonstration of ＂ space water-film and water-ball＂occurring in Shenzhou-10,it is proved that the quiet thick water-film in the space station is a normal convex mirror. A project that people can make lens by using space surroundings,is also proposed.
The practice of college physics course teaching system relying on the excellent teaching team to build innovation quality cultivation type
. 2014, 33(4): 41-41.
Abstract
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739
)
PDF
(328KB) (
847
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The construction of ideas for the course teaching and the role in curriculum construction for the physics college of Jilin university are introduced. Depending on the advantages of the teaching team, we build a teaching system of innovation quality cultivation type. The effect of innovative ability training on the lower grade undergraduates and the development of course in the future are shown.
College physics teaching design of exemplifying Hopfield neural network model
. 2014, 33(4): 44-44.
Abstract
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851
)
PDF
(538KB) (
944
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An extending class of college physics which designed. Knowledge transfer is naturally used to make the researching area mostly as they can. This course is not only employs Hopfield neural network model as an example is students apply the research method of physics to the new guiding students to learn new knowledge but also rendering them to taste the method of research in nature science embedded in college physics.
New design and considering of the uniform magnetic field
. 2014, 33(4): 49-49.
Abstract
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1292
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PDF
(347KB) (
935
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A new type of coils（fuor-coils group）aiming at creating more uniform magnetic field is designed, the thought of which comes from calculating the higher derivatives of the magnetic induction on the center line of Helmhohz coils. Showing from the images of the magnetic field,the amazing advantages of four-coils group against the traditional Hemhohz coils are able to be observed clearly.
Study of the characteristics of image formation in electrostatic lens in oscilloscope tube
. 2014, 33(4): 53-53.
Abstract
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883
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PDF
(403KB) (
724
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The focal length of the electrostatic lens in an oscilloscope tube can be calculated analytically when the potential distribution is known along the axis of the lens. Thus an empirical formula of the focal length is ob- tained from several simplifying models with the help of simulation calculation. Combined with the theory of normal principal point in electrostatic lens,a principle that there exist two sets of parameters that are equivalent in calculating can be derived from the empirical formula of focal length.
Study on electric potential of core-sheU structured medium in uniform electric field
. 2014, 33(4): 58-58.
Abstract
(
762
)
PDF
(444KB) (
614
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The electric potential distribution of core-shell structured medium in uniform electric field is investigated by solving the Laplace equations. The results show that the parallel electric field lines have three cases nearby the surface of core-shell structured medium, which are convergence, divergence and constant case. Furthermore, the above are tested using MATLAB software.
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