141.
Proposed Experiments to Test the Unified Description of Gravitation and
Electromagnetism through a Symmetric Metric
- Özer, Murat
If gravitation and electromagnetism are both described in terms of a
symmetric metric tensor, then the deflection of an electron beam by a charged
sphere should be different from its deflection according to the
Reissner-Nordstr\"om solution of General Relativity. If such a unified
description is true, the equivalence principle for the electric field implies
that the photon has a nonzero effective electric charge-to-mass ratio and
should be redshifted in an electric field and be deflected in a magnetic field.
Experiments to test these predictions are proposed.
142.
Geometric Interpretation of Electromagnetism in a Gravitational Theory
with Torsion and Spinorial Matter
- Horie, Kenichi
Possible geometric frameworks for a unified theory of gravity and
electromagnetism are investigated: General relativity is enlarged by allowing
for an arbitrary complex linear connection and by constructing an extended
spinor derivative based on the complex connection. Thereby the spacetime
torsion not only is coupled to the spin of fermions and causes a four-fermion
contact interaction, but the non-metric vector-part of torsion is also related
to the electromagnetic potential. However, this long-standing relation is shown
to be valid only in a special U(1) gauge, and it is a formal consequence of the
underlying extended geometry.
143.
A theory of electromagnetism with uniquely defined potential and
covariant conserved spin
- van Oosten, A. B.
A theory of electromagnetism is proposed that is based on the Fermi
Lagrangian, which is symmetric under electromagnetic spin rotation. Its
features are: - the four-potential is unambiguously determined by the
inhomogeneous wave equation and boundary conditions at infinity. - the Lorenz
condition and minimal coupling then follow from charge conservation. -
electromagnetic spin is conserved and spin operators can be defined without
sacrificing covariance. - quantisation is fully covariant, without redefining
the metric. - all experimental predictions are the same as in the standard
theory. This result proves that electromagnetic gauge invariance is redundant
as a fundamental principle of physics.
144.
Some formulations coupling finite element and integral equation methods for Helmholtz equation and electromagnetism
- Armel De La Bourdonnaye
this paper a study of the coupling between integral equations and finite element methods is presented for two problems of propagation in frequency domain. It is shown that these problems can be viewed as multidomain problems and treated by the mean of the Schur complement technique. The complement coming from the integral equation part is expressed with the integral operators of the scattering theory. This allows to predict the behaviour of the Schur method, either primal or dual, as far as its convergence speed is concerned. Furthermore, the difference of behaviour between electromagnetism and acoustics from this point of view...
145.
Desarrollo de técnicas basadas en funciones base características para el análisis de radiación, propagación y dispersión en entornos complejos
- Delgado Hita, Carlos
146.
Navy sponsored ELF biological and ecological research summary : update / PME 117 Special Communications Project Office, Naval Electronic Systems Command.
- United States. Naval Electronic Systems Command. PME 117 Special Communications Project Office.
66 leaves ;
147.
Electromagnetic fields : federal efforts to determine health effects are behind schedule : report to the Chairman, Committee on Natural Resources, House of Representatives / United States General Accounting Office.
- United States. General Accounting Office.
54 p. :
148.
Health effects of transmission lines : oversight hearing before the Subcommittee on Water and Power Resources of the Committee on Insular and Insular Affairs, House of Representatives, One Hundredth Congress, first session ... hearing held in Washington DC, October 6, 1987.
- United States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on Water and Power Resources.
v, 393 p. :
149.
Fifth report on "Program for control of electromagnetic pollution of the environment : the assessment of biological hazards of nonionizing electromagnetic radiation" / [Electromagnetic Radiation Management Advisory Council].
- Electromagnetic Radiation Management Advisory Council.
355 p. in various pagings :
150.
Gravito-electromagnetism
- Maartens, Roy; Bassett, Bruce A.
We develop and apply a fully covariant 1+3 electromagnetic analogy for
gravity. The free gravitational field is covariantly characterized by the Weyl
gravito-electric and gravito-magnetic spatial tensor fields, whose dynamical
equations are the Bianchi identities. Using a covariant generalization of
spatial vector algebra and calculus to spatial tensor fields, we exhibit the
covariant analogy between the tensor Bianchi equations and the vector Maxwell
equations. We identify gravitational source terms, couplings and potentials
with and without electromagnetic analogues. The nonlinear vacuum Bianchi
equations are shown to be invariant under covariant spatial duality rotation of
the gravito-electric and gravito-magnetic tensor fields. We construct the
super-energy density and super-Poynting vector of the gravitational...
151.
Introducción al electromagnetismo
- Popovic, Zoya; Popovic, Branko D.
970-24-0206-9
152.
Electromagnetismo con aplicaciones
- Kraus, John Daniel; Fleisch, Daniel A.
970-10-2466-4
153.
Elementos de electromagnetismo
- Sadiku, Matthew N.O.
968-26-1320-5
154.
Classical Electromagnetism
- Good, Robert H.
0-03-022353-9
155.
Electromagnetismo aplicado
- Plonus, M.A.
84-291-3063-2
156.
Engineering Electromagnetism
- M. Ganesh A; S. C. Hawkins B
A high-order tangential basis algorithm for
157.
Understanding Electromagnetism
- Gordon Belot
It is often said that the Aharonov-Bohm effect shows that the vector potential enjoys more ontological significance than we previously realized. But how can a quantummechanical effect teach us something about the interpretation of Maxwell's theory—let alone about the ontological structure of the world—when both theories are false? I present a rational reconstruction of the interpretative repercussions of the Aharonov-
158.
AN ELECTROMAGNETISM META-HEURISTIC FOR THE RESOURCE-CONSTRAINED PROJECT SCHEDULING PROBLEM
- D. DEBELS; M. VANHOUCKE
Recently, a new heuristic algorithm for global optimization has been proposed by Birbil and Fang (2003), referred to as Electromagnetism (EM). This technique is based on the electromagnetism theory of physics, and simulates attraction and repulsion of sample points in order to move towards an optimal solution. In this paper, we have extended the EM methodology for combinatorial optimization problems. To that purpose, we use the EM framework for solving the well-known resource-constrained project scheduling problem (RCPSP) heuristically. We rely on problem-specific characteristics to adapt the original EM framework to the problem under study. We present computational experiments on a...
159.
Solving the Response Time Variability Problem by means of the electromagnetism-like mechanism
- García Villoria, Alberto; Pastor, Rafael
The Response Time Variability Problem (RTVP) is an NP-hard combinatorial scheduling problem that has recently appeared in the literature. The RTVP has a wide range of real-life applications such as in the automobile industry, when models to be produced on a mixed-model assembly line have to be sequenced. The RTVP occurs whenever products, clients or jobs need to be sequenced so as to minimize variability in the time between the instants at which they receive the necessary resources. The field of Artificial Intelligence has provided us with efficient tools such as metaheuristic techniques for solving complex combinatorial scheduling problems. In...
160.
Solving the Response Time Variability Problem by means of the electromagnetism-like mechanism
- García Villoria, Alberto; Pastor, Rafael
The Response Time Variability Problem (RTVP) is an NP-hard combinatorial scheduling problem that has recently appeared in the literature. The RTVP has a wide range of real-life applications such as in the automobile industry, when models to be produced on a mixed-model assembly line have to be sequenced. The RTVP occurs whenever products, clients or jobs need to be sequenced so as to minimize variability in the time between the instants at which they receive the necessary resources. The field of Artificial Intelligence has provided us with efficient tools such as metaheuristic techniques for solving complex combinatorial scheduling problems. In...
