نتایج جستجو برای: electromagnetism theory

تعداد نتایج: 786286  

Journal: :Proceedings of the National Academy of Sciences 1920

Journal: :Mechanics of Materials 2021

In this review, we take an extensive look at the role that principles of causality and passivity have played in various areas physics engineering, including modern field metamaterials. The aim is not to provide a comprehensive list references as number would be thousands, but review major results contributions which animated these unified framework could useful understanding developments differ...

Journal: :Dyna-colombia 2021

In the development of a historical analysis on natural phenomenon electromagnetism, recurrently question appears subject: why does it take researchers about 2300 years to decipher, understand and then dominate apply electromagnetic for benefit human being? To answer this question, hypothesis Bacon's “idols” Bachelard's epistemological obstacle are presented. Both posed very correctly theory kno...

Journal: :Proceedings of the National Academy of Sciences 1956

2006
Ashoke Sen

Unification of the theory of gravitation, as given by Einstein’s general theory of relativity, and the theory of electromagnetism, as formulated by Maxwell, had been Einstein’s dream during the later part of his life. String theory, which is the subject of this article, is an attempt to realize this dream. However in many ways string theory attempts to go beyond Einstein’s dream. String theory ...

2004
Sergey Loyka

In this paper, we study the limitations imposed by the laws of electromagnetism on achievable MIMO channel capacity in its general form. Our approach is a three-fold one. First, we use the channel correlation argument to demonstrate that the minimum antenna spacing under any scattering conditions is at least half a wavelength. Secondly, using a planewave spectrum expansion of a generic electrom...

Journal: :Proceedings of the National Academy of Sciences 1956

2008
Pedro Castelo Ferreira

Electromagnetism, Dynamical Symmetry Breaking, pseudo-photons, Zero Field Equation; packs: 03.50.De,11.15,-q,40. In this work it is considered a mechanism of dynamical symmetry breaking for extended Ue(1)×Ug(1) containing, one vector gauge field A (photon) and one pseudo-vector gauge field C (pseudo-photon). By choosing a particular solution of the equations of motion we obtain a functional des...

2013
André Michaud

In 1941, renowned physicist Julius Adams Stratton wrote in his seminal work titled 'Electromagnetic Theory' : "In the theory of electromagnetism, the dimensions of 0 and 0 that link respectively D and E and B and H, in vacuum, are perfectly arbitrary." This assertion is still valid today in the context of classical electrodynamics since these two constants have never been derived from first p...

2001
S. ANTOCI

Einstein’s unified field theory is extended by the addition of matter terms in the form of a symmetric energy tensor and of two conserved currents. From the field equations and from the conservation identities emerges the picture of a gravoelectrodynamics in a dynamically polarizable Riemannian continuum. Through an approximate calculation exploiting this dynamical polarizability it is argued t...

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