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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Numerical method for low-frequency electromagnetic fields and its applications
低频 电磁场数值 低频涡流场 有限元编程
2023/4/13
本报告首先回顾传统低频涡流场的两种计算格式，指出有限元编程实现过程中的基函数选择以及需要注意的难点问题。第二部分针对静磁场问题，通过引入规范条件提出了一种基于矢量磁位和磁场强度的新型的对偶格式，该方法通过巧妙构造基于矢量磁位和磁场强度的计算格式，整体矩阵完全一致并且可以给出系统电感参数的上下界，在实际参数提取中有很好的应用前景。在第三部分，由于传统低频涡流场近似不能有效考虑分布电容效应，而传统高频...
Electromagnetic fields in air of traveling-wave currents above the earth
Electromagnetic fields air of traveling-wave currents the earth
2015/10/16
The problem of the electromagnetic field created by a thin, straight conductor of infinite length carrying a forward traveling-wave current with a complex propagation constant g above a homogeneous an...
The Electromagnetic Mass Differences of Pions and Kaons
Meson kaon electromagnetic depend on the model input high energy kaon
2014/12/23
We use the Cottingham method to calculate the pion and kaon electromagnetic mass differences with as few model dependent inputs as possible. The constraints of chiral symmetry at low energy, QCD at hi...
Electromagnetic mass differences of pions and kaons
Computing meson kaon electromagnetic chiral symmetry constraint low energy the quality of the meson
2014/12/22
We use the Cottingham method to calculate the pion and kaon electromagnetic mass differences with as few model-dependent inputs as possible. The constraints of chiral symmetry at low energy, QCD at hi...
The leading chiral electromagnetic correction to the nonleptonic Delta I=3/2 amplitude in kaon decays
Kaon decay electromagnetic radiation amplitude phenomenology electromagnetic effect
2014/12/22
In kaon decay, electromagnetic radiative corrections can generate shifts in the apparent ΔI=3/2 amplitude of order αA0/A2not, vert, similar22α. In order to know the true ΔI=3/2 amplitude for compariso...
Electromagnetic properties of nucleons and hyperons in a Lorentz covariant quark model
Magnetic nuclear lorentz covariance the bound state quark let-down pseudo-scalar meson
2014/12/20
We calculate magnetic moments of nucleons and hyperons and N -> Delta + gamma transition characteristics using a manifestly Lorentz covariant chiral quark approach for the study of baryons as bound st...
Spin Effects in Long Range Electromagnetic Scattering
Electromagnetic scattering particles rotate photons exchange quantum mechanics
2014/12/19
We analyze the electromagnetic scattering of massive particles with and without spin and, using the techniques of effective field theory, we isolate the leading long distance effects beyond one photon...
Long Distance Effects in Mixed Electromagnetic-Gravitational Scattering
Scattering dispersed particles the spin configurations
2014/12/19
Using the methods of effective field theory we examine long range effects in mixed electromagnetic-gravitational scattering. Recent calculations which have yielded differing results for such effects a...
Long Range Electromagnetic Effects involving Neutral Systems and Effective Field Theory
Electromagnetic scattering particles particles quantum mechanics the particle spins
2014/12/19
We analyze the electromagnetic scattering of massive particles with and without spin wherein one particle (or both) is electrically neutral. Using the techniques of effective field theory, we isolate ...
Soft-and-Hard/D'B' Boundary Conditions and their Realization by Electromagnetic Media
Boundary Conditions Electromagnetic Media Mathematical Physics
2012/4/27
A layer of uniaxial medium with large axial permittivity and permeability can be used as a quarter-wave transformer with interesting properties. By increasing the transverse permittivity and permeabil...
Fractional Integro-Differential Equations for Electromagnetic Waves in Dielectric Media
Fractional integro-differentiation fractional damping universal response electromagnetic field dielectric medium
2011/9/23
Abstract: We prove that the electromagnetic fields in dielectric media whose susceptibility follows a fractional power-law dependence in a wide frequency range can be described by differential equatio...
Schrodinger's Hat: Electromagnetic, acoustic and quantum amplifiers via transformation optics
Schrodinger's Hat acoustic quantum amplifiers transformation optics
2011/9/19
Abstract: The advent of transformation optics and metamaterials has made possible devices producing extreme effects on wave propagation. Here we give theoretical designs for devices, Schr\"odinger hat...
Common mistakes on "the production of electromagnetic waves" in many popular textbooks
Common mistakes electromagnetic waves college physics textbooks
2011/8/5
Abstract: The present article uncovers a common mistake in many college physics textbooks, specifically, on its presentation and interpretation about generation and propagation of electromagnetic wave...
Beta decay and other processes in strong electromagnetic fields
Beta decay other processes strong electromagnetic fields
2011/1/5
We consider effects of the fields of strong electromagnetic waves on various characteris-
tics of quantum processes.
Axial and electromagnetic observables of hyperons in 2-flavor chiral perturbation theory
Axial electromagnetic observables of hyperons 2-flavor chiral perturbation theory
2011/1/7
Two-flavor chiral expansions provide a useful perturbative framework to study hadron properties.
Such expansions should exhibit marked improvement over the conventional three-flavor chiral
expansion...