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analytic expression OF MAGNETIC FIELD DISTRIBUTION OF RECTANGULAR PERMANENT MAGNETS

Applied Mathematics and Mechanics(English Edition) 2004年第3期25卷 297-306页

作者：苟晓凡杨勇郑晓静 Department of Mechanics College of Physical Science and TechnologyLanzhou University

From the molecular current viewpoint,an analytic expression exactly describing magnetic field distribution of rectangular permanent magnets magnetized sufficiently in one direction was derived from the Biot-Savart's law. This expression is useful not only for the case of one rectangular permanent magnet bulk,but also for that of several rectangular permanent magnet bulks. By using this expression,the relations between magnetic field distribution and the size of rectangular permanent magnets as well as the magnitude of magnetic field and the distance from the point in the space to the top (or bottom) surface of rectangular permanent magnets were discussed in detail. All the calculating results are consistent with experimental ones. For transverse magnetic field which is a main magnetic field of rectangular permanent magnets,in order to describe its distribution,two quantities,one is the uniformity in magnitude and the other is the uniformity in distribution of magnetic field,were defined. Furthermore,the relations between them and the geometric size of the magnet as well as the distance from the surface of permanent magnets were investigated by these formulas. The numerical results show that the geometric size and the distance have a visible influence on the uniformity in magnitude and the uniformity in distribution of the magnetic field.

关键词： permanent magnet magnetic field distribution analytic expression

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Quantum Discord in any Mixture of Two Bi-Qubit Arbitrary Product States

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Communications in Theoretical Physics 2013年第12期60卷 667-672页

作者：王胜房刘益民李国锋刘先松张战军 Engineering Technology Research Center of Magnetic Materials Anhui Province School of Physics & Materials ScienceAnhui University Department of Physics Shaoguan University

Quantum discord in any mixture of two bi-qubit arbitrary product states is studied with two different approaches. In the first approach the maximM classicM correlations are obtained via numerical computations, while in the second approach they are analytically derived. Quantum correlations captured with both approaches completely coincide, as is in accord with the conclusion of Cen et al. [Phys. Rev. A 83 （2011） 054101]. The symmetry reduction of the concerned states concerning quantum correlations is accomplished. The captured discords are amply analyzed so that some inherent distinct properties are revealed.

关键词： quantum discord numerical computation approach analytic expression any mixture two bi-qubit arbitrary product states

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Skin Effect in a DC Coil of Magnet during Startup Phase

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Plasma Science and Technology 2001年第2期3卷 679-682页

作者：王龙 Institute of Physics the Chinese Academy of Sciences Beijing 100080 China

An analytic expression of effective resistance in a conductor has been obtained for thin skin layer approximation and a linearly rising current. The result can be used in the design of magnets in nuclear fusion research.

关键词： analytic expression nuclear fusion skin layer used in

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