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The thermal membrane potential through a cation-exchange membrane has been determined under different experimental situations. In all cases, a good linear dependence between the thermal membrane potential, Delta psi, and the temperature differen[...]texto impreso
Pérez García, Lucas ; de Abril, O. ; Sánchez Tujillo, M. C. ; Aroca, C. ; López, E. ; Sánchez, P. | Elsevier Science BV | 2000-06Multilayer films composed of Co_(x)P_(1-x) ferromagnetic layers with different composition (0.74texto impreso
We present recent results on finite temperature electromagnetic form factors and the electrical conductivity in a pion gas. The standard Chiral Perturbation Theory power counting needs to be modified for transport coefficients. We pay special at[...]texto impreso
Gómez, I. ; Díez, E. ; Domínguez-Adame Acosta, Francisco ; Orellana, P. | Elsevier Science BV | 2003-06We present a novel model to calculate vertical transport properties such as conductance and current in unintentionally disordered double-barrier GaAs-AlxGa1-xAs heterostructures. The source of disorder comes from interface roughness at the heter[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Maciá Barber, Enrique Alfonso ; Méndez Martín, Bianchi | Elsevier Science BV | 1994-10-31We study the electronic structure of a new type of Fibonacci superlattice based on Si delta-doped GaAs. Assuming that delta-doped layers are equally spaced, quasiperiodicity is introduced by selecting two different donor concentrations and arran[...]texto impreso
Enhanced time response of 1-in. LaBr_3(Ce) crystals by leading edge and constant fraction techniques
Vedia Fernandez, Victoria ; Mach Henryk, Andrzej ; Fraile Prieto, Luis Mario ; Udías Moinelo, José Manuel ; Lalkovski, S. | Elsevier Science BV | 2015-09-21We have characterized in depth the time response of three detectors equipped with cylindrical LaBr_3(Ce) crystals with dimensions of 1-in. in height and 1-in. in diameter, and having nominal Ce doping concentration of 5%, 8% and 10%. Measurement[...]texto impreso
An axiomatic basis for fuzzy rationality measures has already been introduced by the authors in a previous paper [5], formalizing the fact that there exist degrees of consistency when preferences over a fixed set of alternatives are expressed in[...]texto impreso
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Direct methanol fuel cells (DMFCs) are attractive for several applications, however, at present, methanol crossover from the anode to the cathode appears to be a major limitation. For this reason, as one of the alternatives, membrane technology [...]texto impreso
We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface det[...]texto impreso
An exact solution for the Schwinger model at finite temperature is given. Path integral methods and thermo field dynamics are used. The explicit dependence of the complete propagators with temperature is foundtexto impreso
A class of exact solutions of the dispersionless Toda hierarchy constrained by a string equation is obtained. These solutions represent deformations of analytic curves with a finite number of nonzero harmonic moments. The corresponding tau-funct[...]texto impreso
Gómez-Ullate Otaiza, David ; González López, Artemio ; Rodríguez González, Miguel Ángel | Elsevier Science BV | 2001-05-28A quantum Hamiltonian describing N particles on a line interacting pairwise via an elliptic function potential in the presence of an external field is introduced. For a discrete set of values of the strength of the external potential, it is show[...]texto impreso
This paper reports experimental results regarding the scaling properties of wetting fronts during the hydration of repacked bentonite clay with a wide range of pore sizes (over five decades). The process of hydration in this swelling, heterogene[...]texto impreso
We find a new exact vacuum solution in the framework of the Poincaré Gauge field theory with massive torsion. In this model, torsion operates as an independent field and introduces corrections to the vacuum structure present in General Relativit[...]