Results 231 to 240 of about 383,957 (288)

Electromagnetic‐Like Generation of Unified‐Gauge Theories

Physics Essays, 1999
We carry out a critical analysis of the Maxwell electromagnetic theory, with emphasis on ifs "geometrical" features and gauge-theoretical properties. This allows us to single out five fundamental principles, which are at the very foundation of electromagnetism and can be used to build up any (electromagnetic-like) unified-gauge theory Such principles ...
R. Mignani, E. Pessa, G. Resconi
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A general theory of DC electromagnetic launchers

Journal of Applied Physics, 2015
The non-linear, transient operation of DC electromagnetic launchers (EMLs) complicates their theoretical understanding and prevents scaling studies and performance comparisons without the aid of detailed numerical models. This paper presents a general theory for DC electromagnetic launchers that has simplified these tasks by identifying critical EML ...
Thomas G. Engel, Erik J. Timpson
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Electromagnetic electron hole generation: theory and PIC simulations

2021
<div> <div> <div> <p>Recent MMS observations (<em>e.g.</em> [Holmes et al, 2018, Steinvall et al., 2019]) exploring various regions of the magnetosphere have found solitary potential structures call Electron phase-space Hole (EH).
Gauthier, Gaetan, Chust, Thomas, Le Contel, Olivier, Savoini, Philippe   +3 more
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Electromagnetic scattering from anisotropic materials, part I: General theory

IEEE Transactions on Antennas and Propagation, 1984
Summary: We obtain integro-differential equations for the electric and magnetic fields inside a linear, lossy, and anisotropic scatterer, in the frequency domain. The material of the scatterer is characterized by arbitrary values of the elements of the relative permittivity tensor \(\overline{\varepsilon}\), the relative permeability tensor \(\overline{
GRAGLIA, Roberto, USLENGHI P. L. E.
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Generalized static electromagnetic fields in Brans–Dicke theory

Journal of Mathematical Physics, 1979
A general class of static, axially symmetric solutions of the Brans–Dicke–Maxwell equations is obtained under the assumption −r2⋅grr=gtt⋅gφφ⋅gzz These solutions have been subjected to conformal transformation and they are found to be new solutions of the static, axially symmetric Einstein–Maxwell–scalar fields. We have also developed a more general set
T. Singh, L. N. Rai
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Transition operators in electromagnetic-wave diffraction theory: General theory

Physical Review A, 1992
A formal theory is developed for the scattering of time-harmonic electromagnetic waves from impenetrable immobile obstacles with given linear, homogeneous, and generally nonlocal boundary conditions of Leontovich (impedance) type for the wave of the obstacle's surface.
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General Theory of Electromagnetic Horns

Journal of Applied Physics, 1951
Exact equations for the propagation of electromagnetic waves in a perfectly conducting horn of arbitrary shape are given. They take the form of an infinite set of simultaneous ordinary linear differential equations, and can be interpreted as the equations of propagation of a system of coupled E- and H-waves.
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Electromagnetic Sources in General Relativity Theory

Physical Review, 1961
The simplest, most direct method of unifying Maxwell's theory of electromagnetism and Einstein's theory of gravitation was formulated by Rainich in 1925. That theory applies only to charge-free space. However, in regions of space in which the electromagnetic field invariant corresponding to E\ifmmode\cdot\else\textperiodcentered\fi{}B vanishes, the two
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A general theory of electromagnetic constitutive relations

Philosophical Magazine B, 1997
Abstract Both necessary and sufficient conditions are derived in a systematic, rigorous way for an electromagnetic constitutive relation to satisfy two fundamental principles: the principle of frame indifference and the second law of thermodynamics. This yields a general theory of constitutive relations which generalizes the classical Ohm's and Hooke's
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Theory of electromagnetic generation of acoustic waves in metals

Advances in Physics, 1986
Abstract The theory of the anomalous skin effect in metals is used in order to study the direct generation of ultrasound by electromagnetic radiation incident on a metal surface, in the absence and in the presence of a magnetic field. The non-monotonic behaviour of the acoustic flux observed experimentally, as a function of the magnetic field can be ...
E. Kartheuser, L.R. Ram Mohan, S. Rodriguez   +2 more
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