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Table of Content
20 January 2012 Volume 31 Issue 1
著者文摘
New comprehension of the Taylor series expansion --One of its special forms
. 2012, 31(1): 1-1.
Abstract
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1380
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A new version of the Taylor series expansion is obtained by ascribing a typical value of complex variable in the expansion. Applications to the usual special functions, including hypergeometric function, spherical harmonics function, cylindrical function, and modified cylindrical function are made. About 20 identities are gained for these functions, which can not be found in the classical literatures.
One-dimensional ferrimagnetic diamond-like chain at low temperature
. 2012, 31(1): 5-5.
Abstract
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812
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608
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The elementary excitations spectrum in the system of a spin 1/2 one-dimensional ferrimagnetic diamond- like chain at low temperature is calculated by using the invariant eigen-operator method. The elementary excitations energy under especial qualification in the system and advantages or deficiencies of invariant eigen-operator method are discussed.
Ferrimagnetic behavior of phase-separated polycrystalline perovskite Nd1-xSrxCoO3
. 2012, 31(1): 9-9.
Abstract
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734
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348
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The ferrimagnetic behavior of polycrystalline Nd1-xSrxCoO3 （0.1≤x≤0.5 ） sample is systematically investigated. The sample is prepared by using conventional solid state reaction method. The DC magnetization and the hysteresis loops of polycrystalline Nd1-xSrxCoO3 are carried out by using the physical properties measurement system of quantum design. DC magnetization studies show that magnetization increases in magnitude as a result of increasing size and number of ferromagnetic clusters, which shows ferromagnetic ordering. Moreover, DC magneti- zation studies show that polycrystalline samples form the formation of ferrimagnetic order at low temperature. The re- sult of the hysteresis loop suggests that magnetic coupling exists between Nd ions and Co ions. Therefore, Nd1-xSrxCoO3 ferrimagnetic order appears at low temperature due to the Co and Nd anti-parallel.
Functional relationship of sheet metal inhaled into the capacitor in the vibrating process
. 2012, 31(1): 13-13.
Abstract
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770
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(354KB) (
402
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The electric neutral sheet metal inhaled into the capacitor vibrates by the attraction of capacitor＇ s electric charges. The problems discussed here are follows： vibratory rule of sheet metal with or without damping; function convertion in movement that electric field force makes speed up or down of sheet metal; electric quantity or voltage of the capacitor remain unchanged energy storage keep changed in sheet metal vibratory process; the power source to supply capacitor＇ s energy in each sheet metal vibrating cycle ; the periodical change of capacitor voltage, electric quantity and other parameters.
Some discussion on a puzzling problem of electrostaticsc
. 2012, 31(1): 17-17.
Abstract
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865
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947
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There is a famous 1/2 problem in the interaction energy between a conductor and an external electrical field. This paper expounds this problem from different viewpoints such as point charge model, mechanical analogy of electric media and thermodynamic relations of electric media. Meanwhile, we clarify some complex relations concerning electrostatic energy.
Aanalysis on shielding effectiveness of conductor in magnetic field
. 2012, 31(1): 20-20.
Abstract
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964
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762
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The shielding effectiveness of conductor in static magnetic field and alternating magnetic field are calculated. The influencing factors on shielding effectiveness of conductor are discussed.
The magnetic field of a line electric current inside the limitless deep trough limited by a ferromagnetic substance
. 2012, 31(1): 23-23.
Abstract
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827
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231
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This paper is intended to calculate the magnetic field of a line electric current in the infinite deep trough imited by a ferromagnetic substance by using Schwarz-Christoffel transformations on the coordinate system of the complex number and mirror image method. We obtain the magnetic potential arrow distribution and magnetic induction line equation. The magnetic induction line map is plotted by using the software MATLAB
Study of diffraction spectrum of the transmission rectangle phase grating
. 2012, 31(1): 27-27.
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1460
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1493
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：A simple method to calculate the diffraction field of the transmission rectangle phase grating is proposed. The diffraction spectrum of the transmission phase grating is analyzed. It is shown that the diffraction field of the transmission phase grating is closely related to the grating＇ s optical thickness and the incident wavelength. A condition under which the diffraction energy will move from zero order to the first order diffraction spectrum is obtained. The discussion on the passable applications of the grating is made.
Experiment of the periodical vent of the hole and its analysis between salt water and water
. 2012, 31(1): 31-31.
Abstract
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868
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438
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Through the experimental research of the brine-the water eyelet periodic aerial drainage and the measure of the length of 8 different holes which is 1.32 mm aperture, we obtain the cycle in proportion to the length of the hole 1.1 ±0.1 powers of exponent. At the same time, we track the record of the inner tube liquid level which has 1.32 mm aperture and 113.00 mm length to get the experimental curve which is the exponential form, this is in good agreement with the theoretical analysis.
Study on type A uncertainty in college physics experiment
. 2012, 31(1): 35-35.
Abstract
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1356
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3629
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Since the evaluation method of type A experiment books, it is inconvenient to the teaching students. The evaluation method of type A uncertainty uncertainty is not clearly described in many college physics of physics experiment as well as the data processing of in college physics experiment is studied in this paper.
What does the history of science look like from physicists＇ perspective？
. 2012, 31(1): 39-39.
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801
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(455KB) (
465
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The history of science is a special discipline, different people have different understandings to it. The physicists have an especial perspective to understand the history of science. They believe it is most meaningful to science education to reappear the details of the research works by scientists. They also consider it is an important part of the history of science to research scientists from the perspective, which treat them as social people. This would help to build harmonious relationships between scientific culture and human culture.
Matthias prize, Bardeen prize and Onnes prize in the field of superconductivity
. 2012, 31(1): 43-43.
Abstract
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1008
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707
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It has been 100 years since the discovery of superconductor in 1911. In this paper, we give a brief introduction of three prizes in the field of superconductivity： Matthias prize, Bardeen prize and Onnes prize. These prizes award physicists who had made outstanding contributions on the discovery of superconductors, developing theory of superconductivity and illuminating the nature of superconductivity from experiment. Up to now, there are already 35 physicists awarded.
Thinking and study on the construction of science education course of ＂Introduction to Modern Science and Technolog＂ ——a good platform for the merger between science and humanities education
. 2012, 31(1): 47-47.
Abstract
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670
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(422KB) (
1005
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The course of ＂Introduction to Modern Science and Technology＂ is deeply welcomed by college students as it is in the line with the science quality education of the times. We make a meticulously choice on the content of the course and make it with special feature. We also pursue an innovation on the teaching method to the course so as to make the college students could have a good understanding on science and develop their scientific spirit by showing them the development course of modern science and scientific stories.
The analytical solution of motion under two and four power potential and its Lissajou＇ s figure
. 2012, 31(1): 51-51.
Abstract
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782
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(234KB) (
605
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The analytical solution of movement of particle under the combined two and four power potential is obtained. The displacement of particle is expressed in term of Jacobi elliptical function. The trajectory of particle under two perpendicular potentials, i. e. , the generalized Lissajou＇ s figures, are also discussed and given.
Analysis of the abnormal phenomena of extraordinary light in birefringence by using the Huygens construction
. 2012, 31(1): 54-54.
Abstract
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1530
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874
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When birefringence happens in the uniaxial crystals, some abnormal phenomena of the extraordinary light may occur, such as negative refraction, walk-off angle, total reflection and so on. Different from the electromagnetic theory of plane waves transmission in crystals as in the references, we use the Huygens construction, which is more intuitive, with some geometric methods to calculate the critical incidence angle of negative refraction, the walk-off angle and the critical incidence angle of total reflection of the extraordinary light.
A simulation platform of atomic force microscope based on piezoelectric hysteresis model
. 2012, 31(1): 58-58.
Abstract
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774
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(392KB) (
538
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With the Preisach hysteresis model of piezoelectric ceramics, which is based on the biuadratic Lagrange interpolation method, added in ,the atomic force microscope （AFM） simulation platform can simulate the scanning image distortion caused by the hysteresis effect in any voltage, and demonstrate the real scanning process of AFM more accurately for students in the experiments. To correct the distortion of the scanning images, the searching inversion algorithm is proposed to achieve the precise inverse Preisach model, and the corresponding input voltage is set to offset nonlinearity of the hysteresis effect, the simulation results show these methods effectively correct image distortion.
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