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Babinet原理电磁形式在金属导电屏的衍射测量中的应用
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作者 吕洪君 方林瑞 《安徽教育学院学报》 2000年第3期10-12,共3页
本文从Babinet原理的电磁关系式出发 ,讨论了电磁场在金属屏和其互补屏上的衍射场之间的关系 ,导出了金属窄缝和互补窄条在平面波正入射下的电磁矢量Babinet原理的具体数学形式 ,给出其在实际测量中的应用 。
关键词 Babinet原理 金属导电屏 电磁形式 衍射测量 光学
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Electric and Magnetic Form Factors of Proton in Relativistic Constituent QuarkModel
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作者 WANGHong-Min ZHANGBen-Ai 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第3期425-428,共4页
Based on relativistic constituent quark (RCQ) model, the electric and magnetic form factors are analyzed. The ratio of the two form factors for the proton , which is an image of its charge and magnetization distributi... Based on relativistic constituent quark (RCQ) model, the electric and magnetic form factors are analyzed. The ratio of the two form factors for the proton , which is an image of its charge and magnetization distributions, is calculated in the light-front formulism of RCQ model. Recently, this ratio was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the polarization technique. The new data presented span the range and are well described by a linear Q<SUP>2</SUP> fit. Also, the ratio reaches a constant value while Q<SUP>2</SUP> becomes larger than 2 (GeV)<SUP>2</SUP>. Our calculation results are presented and appear to be consistent with the experimental ones. 展开更多
关键词 form factors relativistic constituent quark model radial function
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Time-Machine Solutions of Einstein's Equations with Electromagnetic Field
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作者 沈明 孙庆有 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第1期69-71,共3页
In this paper we investigate the time-machine problem in the electromagnetic field. Based on a metric which is a more general form of Ori's, we solve the Einstein's equations with the energy-momentum tensors for ele... In this paper we investigate the time-machine problem in the electromagnetic field. Based on a metric which is a more general form of Ori's, we solve the Einstein's equations with the energy-momentum tensors for electromagnetic field, and construct the time-machine solutions, which solve the time machine problem in electromagnetic field. 展开更多
关键词 time-machine solutions closed timelike curves Einstein's equations energy-momentum tensor electromagnetic field energy conditions
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magnetic tunnel junctions spin-transfer torque magneto-resistance nanomagnet dynamics
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作者 Nader Ghobadi Reza Daqiq 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第2期254-258,共5页
We investigate bias and different barrier thicknesses effects on quantities related to spin and charge currents in MgO-based magnetic tunnel junctions. Using the non-Equilibrium Green's function formalism, we demonst... We investigate bias and different barrier thicknesses effects on quantities related to spin and charge currents in MgO-based magnetic tunnel junctions. Using the non-Equilibrium Green's function formalism, we demonstrate that the in-plane and out-of-plane components of the spin-transfer torque have asymmetric and symmetric behaviors respectively. Magneto-resistance also decreases with increasing barrier thickness. The Landau–Lifshits–Gilbert equation describes the dynamics of the magnetization made by spin transfer torque. Increasing in spin current above its critical value or smaller the magnet reduces the switching time which is major result for making of new memory devices. 展开更多
关键词 Magneto-Transport and Nanomagnet Dynamics in MgO-Based Magnetic Tunnel Junctions(MTJs)
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