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1. Solutions of Maxwell Equation of Long Cylinder Crystal in Meissner and Normal States | |||
LI Qiang | |||
Physics 18 December 2015 | |||
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Abstract:We present a model of electric current in a long cylinder crystal, with a core equation derived directly from Maxwell equation with the electric current expression based on probability density. The core equation has a general solution corresponding to normal state and a special solution corresponding to Meissner effect (superconducting state), which would only be present when all carriers are of surface state electrons. The model could be a ground for discussing transition from normal state to superconducting state. We have also discussed an alternative approach of perturbation treatment. | |||
TO cite this article:LI Qiang. Solutions of Maxwell Equation of Long Cylinder Crystal in Meissner and Normal States[OL].[18 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668912 |
2. Teaching electromagnetics through advanced numerical simulations and virtual experiments | |||
YIN Wuliang,ZHAO Qian | |||
Physics 31 December 2014 | |||
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Abstract:Electromagnetic field is an advanced topic which requires thinking in abstract terms and with imagination. This paper presents authors' experience in teaching electromagnetics at Tianjin University, China and demonstrates that this difficult subject can be tackled with the help of advanced numerical simulations and virtual experiments. Commercial simulation packages and in house developed software such as the Finite Elements Method (FEM), the Boundary Element Method (BEM) and an analytical method were used for this purpose. Overall, students have provided positive feedback for this teaching methodology. | |||
TO cite this article:YIN Wuliang,ZHAO Qian. Teaching electromagnetics through advanced numerical simulations and virtual experiments[OL].[31 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624647 |
3. Triboelectric charge distribution in insulative granular systems | |||
CAI Xiaobing | |||
Physics 23 January 2013 | |||
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Abstract:Triboelectrification of insulative granular system is a common phenomenon yet still not fully understood. Recent industrial and environmental processing technologies demand more comprehensive knowledge on tribo-charge within the flowing granular systems. Based on high-energy state electron hypothesis, here we develop an analytical model to predict the triboelectric charge distribution among particle systems. Particle size dependence of the tribo-charge is revealed, and influence of size range on the tribo-charge probability is evaluated. While the net tribo-charge of an individual particle is unpredictable, an interesting upper bound for the tribo-charge is found. Particle dynamic simulation is also carried out to study the charge transferring within the particle colliding process, which verifies the analytical prediction result. | |||
TO cite this article:CAI Xiaobing. Triboelectric charge distribution in insulative granular systems[OL].[23 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4517474 |
4. New Force from Partially Asymmetric Circuit Including a Capacitor with Large Electrode Distance | |||
Xu Yue,Wang Haibin | |||
Physics 01 February 2010 | |||
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Abstract:Here we show a new force from a kind of circuit including a capacitor with large electrode dis-tance. The capacitor paragraph receives no equal Ampere force with the conductor paragraph does, which result is to produce the force. Through choosing the frames and components of the equipment, there is a possibility to calculate or control the size & direction of this force. When the current and the electrode distance are large enough, the force can overcome gravity as well as supply a new driving force to movement machinery. Suitable experiment can be therefore established. By the way, we find the unknown force in \"Biefeld Brown effect\" device. And we may fulfill the blank of the whole capacitor series. | |||
TO cite this article:Xu Yue,Wang Haibin. New Force from Partially Asymmetric Circuit Including a Capacitor with Large Electrode Distance[OL].[ 1 February 2010] http://en.paper.edu.cn/en_releasepaper/content/39760 |
5. Research on the transmission coefficient and quality factor in two-dimensional photonic crystal microcavities | |||
Dan Wang,Lieming Li,Wenbin Cao,Bi Changlu ,Wang Ziqiang | |||
Physics 23 January 2009 | |||
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Abstract:The quality factor Q and the transmission T caused by the variation of the number of Si cylinders of two-dimensional photonic crystal microcavities with one point defect have been investigated by the multiple-scattering computation method. The quality factor and transmission would be increased with the increase of the number of cylinders. When the number of cylinders were 13 in x direction and 19 in y direction, the quality factor and transmission of the 2D photonic crystal microcavity achieved at 2*106 and 100%, simultaneously. | |||
TO cite this article:Dan Wang,Lieming Li,Wenbin Cao, et al. Research on the transmission coefficient and quality factor in two-dimensional photonic crystal microcavities[OL].[23 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28297 |
6. Spin Wave Emitting Effect Caused by Current-induced Spin Transfer Torque in PSV | |||
Chen Peiyi,Hu Jiuning,Zhang Lei,Ren Min,Dong Hao,Deng Ning | |||
Physics 11 April 2008 | |||
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Abstract:This article presents a magnetic dynamics description for current-induced STT in PSV, which could illuminate that the effects of SWE and CIMS in magnetic multiplayer nanostructures. The spin current polarization is determined by the continuity boundary condition of spin current and chemical potential under the case of conduction matching. The roles of longitudinal and transverse components of STT are different in magnetic multiplayer that longitudinal one generates CIMS effect, while transverse one is necessary for SWE effect. From the theory, the double spin wave modes have been naturally obtained by LLG equation, which are x mode and y mode, respectively, due to the transverse STT, and cause resistance of magnetic multiplayer altering following time with frequency 2w or w(precession frequency). Magnetic field and spin current control frequency and power of SWE according to this theory, which predicts a special device structure, for example, the perpendicular configuration, should present much higher efficiency of SWE that has been demonstrated by some experiment results. | |||
TO cite this article:Chen Peiyi,Hu Jiuning,Zhang Lei, et al. Spin Wave Emitting Effect Caused by Current-induced Spin Transfer Torque in PSV[OL].[11 April 2008] http://en.paper.edu.cn/en_releasepaper/content/20397 |
7. New Potential Energy and Measure Method for Magnetic Potential | |||
Wu Mengqi ,Wei Yulan ,Wu Wei | |||
Physics 13 November 2007 | |||
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Abstract:Based on Lagrangian and A-B effect experiment, a kind of new electric potential energy that obtained by electron or other charged body in magnetic field has been looked. This potential energy is a Chiral Potential Energy. It is dependent of magnetic potential and that is independent of magnetic induction intensity. In this paper, the measure method and definition or magnetic potential are demonstrated, the metrical data of magnetic potential at surface of a magnet is showed, a new viewpoint that magnetic potential is the momentum of unit charge in magnetic field is put forward, and a new Hall effect that is produced by magnetic potential is predicted. | |||
TO cite this article:Wu Mengqi ,Wei Yulan ,Wu Wei . New Potential Energy and Measure Method for Magnetic Potential[OL].[13 November 2007] http://en.paper.edu.cn/en_releasepaper/content/16309 |
8. Size effect on the magnetism of nanocrystalline Ni films at ambient temperature | |||
Sun Changqing | |||
Physics 13 July 2005 | |||
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Abstract:Size effect on the magnetization and the coercivity of nanocrystalline Ni films has been examined at room temperature. Agreement between modeling predictions and measurements reveals that the size-suppressed magnetization results from the drop of spin-spin exchange energy due to the coordination number (CN) imperfection of atoms near the surface edges, and that the size-enhanced coercivity arises from intergrain interaction that is proportional to the inverse of particle size. Findings herewith and reported previously on the size-induced lattice contraction and Curie temperature suppression evidence the significance of atomic CN imperfection on the unusual behavior of a ferromagnetic nanosolid. | |||
TO cite this article:Sun Changqing. Size effect on the magnetism of nanocrystalline Ni films at ambient temperature[OL].[13 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2439 |
9. Impact of bond-order loss on surface and nanosolid magnetism | |||
Sun Changqing | |||
Physics 23 June 2005 | |||
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Abstract:Incorporating the recent bond order-length-strength correlation mechanism [Sun et al., Acta Mater 2004;52:501] into the Ising convention and the Brillouin function has enabled the unusual magnetic behavior of a ferromagnetic nanosolid and a surface to be reproduced using Monte Carlo simulations. Examination of the size and temperature dependence of the saturation magnetization (MS) of a solid of various structures reveals that: (i) at low temperatures, the MS increases inversely with solid size due to the contribution from the localized charges that are trapped by the deepened potential well of the lower-coordinated atoms in the surface skins, (ii) at the ambient temperatures, the MS drops with solid size because of the bond order loss that suppresses the Curie temperature of the specimen, and (iii) the quantized features of the surface to volume ratio of the solid is responsible for the observed MS oscillations of smaller clusters at low temperatures. | |||
TO cite this article:Sun Changqing. Impact of bond-order loss on surface and nanosolid magnetism[OL].[23 June 2005] http://en.paper.edu.cn/en_releasepaper/content/2263 |
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