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Elsevier Science BV |
Documentos disponibles de esta editorial (389)
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Llanes Estrada, Felipe José ; Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2002-12-12We present the pion-pion elastic scattering amplitude at finite temperature to one-loop in chiral perturbation theory. The thermal scattering amplitude properly defined allows to generalize the perturbative unitarity relation to the T 0 0 case. [...]texto impreso
Llanes Estrada, Felipe José ; Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2005-01-27We discuss the thermal behaviour of the pion vector form factors and calculate them in one-loop chiral perturbation theory. The perturbative result is used to analyze the T dependent electromagnetic pion charge radius, obtaining a rough estimat[...]texto impreso
Izquierdo Gil, María Amparo ; Fernández Pineda, Cristóbal ; Lorenz, M. G. | Elsevier Science BV | 2008-08-15Direct contact membrane distillation (DCMD) experiments using distilled water are reported. Influence on the process of feed and permeate flow rates through the cell has been investigated in a wide flow range, from 2 to 8l/min. Two main effects [...]texto impreso
Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Elsevier Science BV | 2010-10We examine the leading-N(c) behavior of the masses and transition matrix elements of some low-lying, few particle configurations in QCD. A truncation of the Fock space produces an effective, symmetric Hamiltonian that we diagonalize. The lowest [...]texto impreso
TThe existence and properties of the sigma meson have been controversial for almost six decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the nucleonnucleon attraction. This controversy has also been fed by [...]texto impreso
We show how Ramond free neutral Fermi fields lead to a ?-function theory of BKP type which describes iso-orthogonal deformations of systems of orthogonal curvilinear coordinates. We also provide a vertex operator representation for the classical[...]texto impreso
Fuzziness and bipolarity allow representing human knowledge, taking into account the gradual and the dialectic properties of language, focusing on the meaning of concepts. Under this cognitive and linguistic approach, we explore preference relat[...]texto impreso
In this paper we prove that S-paracompactness, S*-paracompactness, fuzzy paracompactness, and .-fuzzy paracompactness are invariants and inverse invariants of various types of fuzzy perfect maps.texto impreso
Fuzzy preference relations formalize intensity of individual preferences over fixed sets of alternatives. It is therefore natural to extend to fuzzy preferences the notion of rationality or consistency. With this goal in mind, we address in this[...]texto impreso
Fernández Pineda, Cristóbal ; Izquierdo Gil, María Amparo ; García Payo, María del Carmen | Elsevier Science BV | 2002-03-31Gas permeation experiments using helium, air and argon and direct contact membrane distillation (DCMD) experiments using distilled water are reported. From gas permeation experiments the characteristic parameters of the Knudsen and Poiseuille tr[...]texto impreso
García Villaluenga, Juan Pedro ; Seoane Rodríguez, Benjamín ; Hradil, J. ; Sysel, P. | Elsevier Science BV | 2007-11-15Heterogeneous carbon molecular sieves and hypercrosslinked polystyrene microparticles adsorbent-based membranes with a (ODPA-BIS P) polyimide binder were prepared. The effect of adsorbent particles on the gas transport properties of heterogeneou[...]texto impreso
It is argued that the quadratic and linear non-commutative IR divergences that occur in U(1) theory on non-commutative Minkowski space-time for small non-commutativity matrices theta (mu nu) are gauge-fixing independent. This implies in particul[...]texto impreso
A scheme for solving quasiclassical-string equations is developed to prove that genus-zero hitham hierarchies describe the deformations of planar domains determined by rational conformal-maps. This property is applied in normal matrix models to[...]texto impreso
Bejarano, Cecilia ; Delhom, Adria ; Jimenez Cano, Alejandro ; Olmo, Gonzalo J. ; Rubiera García, Diego | Elsevier Science BV | 2020-03-10Projective invariance is a symmetry of the Palatini version of General Relativity which is not present in the metric formulation. The fact that the Riemann tensor changes nontrivially under projective transformations implies that, unlike in the [...]texto impreso
Rivero, Carlos ; Castillo, Angela ; Zufiria, Pedro J. ; Valdés Sánchez, Teófilo | Elsevier Science BV | 2004-04We present an investigation into the dynamics of a system, which underlies a new estimating algorithm for regression with grouped and nongrouped data. The algorithm springs from a simplification of the well-known EM algorithm, in which the expec[...]texto impreso
Piquero Sanz, Gemma María ; Martínez Herrero, Rosario ; Mejías Arias, Pedro Miguel ; Ramírez Sánchez, Victoria | Elsevier Science BV | 2008-04-15Several global parameters are proposed to characterize the radial and azimuthal polarization content of non-uniformly totally polarized beams. Such figures of merit can be written and measured in terms of two Stokes parameters, and also from the[...]texto impreso
We obtain the spectrum of glueball masses for the N = 1 non-conformal cascade theory whose supergravity dual was recently constructed by Klebanov and Strassler. The glueball masses are calculated by solving the supergravity equations of motion f[...]texto impreso
We analyze the storage and retrieval of a weak light pulse, having two orthogonally (circularly) polarized components, onto an atomic ensemble of four-level atoms of the tripod type driven by a far detuned coupling field. The atoms are subject t[...]texto impreso
We study the production of gravitinos during the preheating era after inflation by means of the non-perturbative Bogolyubov technique. Considering only the helicity ±3/2 states, the problem is reduced to the simpler Dirac fermions case. We calcu[...]texto impreso
We review our results on the calculation of helicity ±1/2 gravitino production during preheating. The method we present is based on the equivalence between goldstinos and longitudinal gravitinos at high energies. The problem is thus reduced to t[...]texto impreso
Sochinskii, N. V. ; Saucedo, E. ; Abellan, M. ; Rodríguez Fernández, José ; Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Ruiz, C.M. ; Bermudez, V. ; Dieguez, E. | Elsevier Science BV | 2008-04Cadmium telluride (CdTe) crystals and epitaxial layers were grown by the vertical Bridgman method and vapor-phase epitaxy, respectively, to obtain the high-resistive material suitable for X- and gamma-ray detectors. The crystals and layers were [...]texto impreso
Llanes Estrada, Felipe José ; Torres Rincón, Juan Miguel ; Cabrera Urban, Daniel ; Abreu, Luciano M | Elsevier Science BV | 2013-09-20Charm and bottom transport coefficients in a medium constituted of light mesons, such as is formed in the hadronic phase of heavy-ion collisions, are obtained within an effective field theory approach implementing heavy-quark symmetry and chiral[...]texto impreso
Dobado González, Antonio ; Morales, J. ; Peláez Sagredo, José Ramón ; Urdiales, M.T. | Elsevier Science BV | 1996-10-24In this paper we study the large N limit of the Standard Model Higgs sector with N lambda, Ng(2) and Ng('2) constant and N being the number of would-be Goldstone bosons, Despite the simplicity of this method at leading order, its results satisfy[...]texto impreso
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This paper presents a high efficiency holographic coupler design for telecommunication purposes. It is based on the eikonal approach to diffracted field analysis and on the coupled wave analysis for gaussian beam in generalized coordinate.