0377-2217/$ see front matter 2010 Elsevier B.V. A doi:10.1016/j.ejor.2010.01.035 * Corresponding author. Tel.: +39 51 2093028; fax: E-mail addresses: [email protected] (Z. Na (P. Toth), [email protected] (L. Galli). In this paper we propose a new heuristic algorithm to solve the unicost version of the well-known set covering problem. The method is based on the electromagnetism metaheuris...

We showed before that self-dual electromagnetism in noncommutative (NC) spacetime is equivalent to self-dual Einstein gravity. This result implies a striking picture about gravity: Gravity can emerge from electromagnetism in NC spacetime. Gravity is then a collective phenomenon emerging from photons living in fuzzy spacetime. We elucidate in some detail why electromagnetism in NC spacetime shou...

In a previous work [1] a theory of gravitation based on a nonsymmetric metric was formulated (pure gravitation with no association of the antisymmetric part of the metric to the electromagnetic eld strength). The sources of the metric eld are the matter energymomentum tensor T and the matter fermionic particle number current density S . This is a conserved current with particle number fermionic...

Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. This geometry can be characterized by an orthonormal coframe θ and a (metric compatible) Lorentz connection Γ . These two potentials yield the field strengths torsion T and curvature R . Evans tried to infuse electromagnetic properties into thi...

Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. This geometry can be characterized by an orthonormal coframe θ and a (metric compatible) Lorentz connection Γ . These two potentials yield the field strengths torsion T and curvature R . Evans tried to infuse electromagnetic properties into thi...

Perturbation theory permits the analytic study of small changes on known solutions, and is especially useful in electromagnetism for understanding weak interactions and imperfections. Standard perturbation-theory techniques, however, have difficulties when applied to Maxwell's equations for small shifts in dielectric interfaces (especially in high-index-contrast, three-dimensional systems) due ...

A complete geometric unification of gravity and electromagnetism is proposed by considering two aspects of torsion: its relation to spin established in Einstein–Cartan theory and the possible interpretation of the torsion trace as the electromagnetic potential. Starting with a Lagrangian built of Dirac spinors, orthonormal tetrads, and a complex rather than a real linear connection we define an...

Albert Einstein’s general theory of relativity describes gravitation through a deformation space-time. However, there is high degree parallelism between the linear approximation and Maxwell’s electromagnetism. The first laws allows one to derive Coulomb’s law and, therefore, correct radius dependency charge interaction. Both theories (general theory) are absolutely equivalent each other in deri...

This paper introduces an improved electromagnetism-like algorithm (IEM) for recurrent fuzzy neural controller design. The hybrid IEM algorithm combines the advantages of the electromagnetism-like (EM) algorithm and the genetic algorithm (GA). The proposed IEM is composed of initialization, local search, total force calculation, movement, and evaluation. For recurrent fuzzy neural controller des...