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Elsevier Science BV |
Documentos disponibles de esta editorial (389)
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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[...]![]()
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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 (0.74![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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 found![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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The so called Li&Ma formula is still the most frequently used method for estimating the significance of observations carried out by Imaging Atmospheric Cherenkov Telescopes. In this work a straightforward extension of the method for point source[...]![]()
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In the same way as 'comprehensive fuzziness' deals with o-fields of labels, 'extensive fuzziness' deals with objects. In this paper, the concept of 'extensive mapping' is defined in order to justify the notion of 'measurable fuzzy function'. Thi[...]![]()
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Paris, J.L. ; Lafuente-Gómez, Nuria ; Cabañas Criado, Victoria ; Román, Jesús ; Peña, Juan ; Vallet Regí, María | Elsevier Science BV | 2019-03-013D porous scaffolds based on agarose and nanocrystalline apatite, two structural components that act as a temporary mineralized extracellular matrix, were prepared by the GELPOR3D method. This shaping technology allows the introduction of therma[...]![]()
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Membrane distillation (MD) has a great potential as a concentration process for temperature labile liquids such as fruit juices, etc. Besides water, also aroma compounds will permeate through the membrane depending on their volatility and how th[...]![]()
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Antoranz Canales, Pedro ; Barrio Uña, Juan Abel ; Contreras González, José Luis ; Fonseca González, Mª Victoria ; López Moya, Marcos ; Miranda Pantoja, José Miguel ; Nieto, Daniel | Elsevier Science BV | 2008-09-11Until April 2007 the Major Atmospheric Gamma ray Imaging Cherenkov (MAGIC) telescope used a 300 MSamples/s flash analog-to-digital converter (FADC) system to sample the shaped photomultiplier tube (PMT) signals produced by the captured Cherenkov[...]![]()
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It is shown that thermo-field dynamics permits the extension of the path integral methods used to solve the Thirring model at zero temperature to the finite temperature case. A family of exact solutions for the propagator and their dependence wi[...]![]()
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Piquero Sanz, Gemma María ; Borghi, Riccardo ; Mondello, A. ; Santarsiero, Massimo | Elsevier Science BV | 2001-08-15We analyze the polarization features of the beam, generated by a class of partially polarized quasi-homogeneous sources, which propagates through a polarization grating. Analytical expressions in the far zone for the beam coherence polarization [...]![]()
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This paper presents a fibre-optic sensor to measure weight in motion based on a multiple fibre-optic interferometer. The differential phase between the arms of the interferometer produced by the pressure is compensated by a feedback system, thus[...]![]()
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Ballesteros, H. G. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio | Elsevier Science BV | 1996-10-10We study the critical properties of three-dimensional O(N) models, for N = 2,3,4. Parameterizing the leading correctionsto-scaling for the r] exponent, we obtain a reliable infinite volume extrapolation, incompatible with previous Monte Carlo va[...]![]()
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Ballesteros, H.G. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Parisi, G. ; Ruiz-Lorenzo, J. J. | Elsevier Science BV | 1998-04We study the four dimensional site-diluted Ising model using finite-size scaling techniques. We explore the whole parameter space (density-coupling) in order to determine the Universality Class of the transition line. Our data are compatible wit[...]