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Elsevier Science BV |
Documentos disponibles de esta editorial (389)
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The angular momentum of non-uniformly totally polarized beams is investigated using methods from the beam characterization approach. The relationship between the elements of the beam matrix for the two components of the field and the angular mom[...]![]()
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Piquero Sanz, Gemma María ; Martínez Herrero, Rosario ; Mejías Arias, Pedro Miguel | Elsevier Science BV | 2008-02-15In terms of the so-called irradiance moments of a light field, the beam quality change, ?Q, of radially and azimuthally polarized beams caused by propagation through a quartic phase plate (as occurs for example, in strongly pumped laser rods us[...]![]()
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We obtain a supergravity solution arising when D6-branes are wrapped on coassociative four-cycles of constant curvature in seven manifolds of G_(2) holonomy. The solutions preserve two supercharges and thus represent supergravity duals of three [...]![]()
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Monteiro, T. ; Pereira, E. ; Correia, M. R. ; Xavier, C. ; Hofmann, D. M. ; Meyer, B. K. ; Fischer, S. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science BV | 1997-06Mid-band-gap emissions in GaN epilayers grown on 6H-SiC and sapphire are studied by time-resolved spectroscopy (TRS). The yellow luminescence peaking at ca. 1.2 eV at low-temperature shifts to higher energies with increasing temperature. The pre[...]![]()
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Elshorbagy, Mahmoud Hamdy Mohamed ; Abdel-Hady, Kamal ; Kamal, Hala ; Alda, Javier | Elsevier Science BV | 2017-01-07Absorption of amorphous-Si hydrogenated (aSi-H) solar cells can be enhanced by using dielectric nanostructures made of Si3N4 that work like antireflection coatings. The analysis focus on the short-circuit current delivered by the cell under sola[...]![]()
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We prove that three-dimensional N=1 supersymmetric Yang Mills-Chem-Simons theory is finite to all loop orders, In general this leaves open the possibility that different regularization methods lead to different finite effective actions. We show [...]![]()
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Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | Elsevier Science BV | 2011-08-03We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation Theory at low and moderate temperatures, below any phase transition to a quark-gluon plasma phase. We argue that inelastic processes are irrelevant and exponentially sup[...]![]()
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Franco Peláez, Francisco Javier ; Zong, Yi ; Agapito Serrano, Juan Andrés | Elsevier Science BV | 2009-11-12Commercial-off-the-shelf (COTS) capacitor-based isolation amplifiers were irradiated at the Portuguese Research Reactor (PRR) in order to determine its tolerance to the displacement damage and total ionising dose (TID). The set of experimental d[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Garcia, J. A. ; Remon, A. ; Opagiste, C. | Elsevier Science BV | 1997-05The capability of luminescence techniques to characterize BaCuO_2 and in particular to detect the presence of this compound as impurity phase in high-T-c superconductors (HTSC) has been investigated. Cathodoluminescence (CL) in the scanning elec[...]![]()
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Cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope have been applied to the microcharacterization of superconducting Bi2Sr2CaCu2O8+x single crystals. CL spectra representative of the samples at macroscopic l[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Opagiste, C. | Elsevier Science BV | 1996-03-01Luminescence properties of Tl_2Ba_2CuO_(6+ ?) samples with different superconducting transition temperatures have been studied by cathodoluminescence (CL) in the scanning electron microscope. Independent of the crystal structure, tetragonal or o[...]![]()
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Palomar Trives, Carlos ; Franco Peláez, Francisco Javier ; González Izquierdo, Jesús ; López Calle, Isabel ; Agapito Serrano, Juan Andrés | Elsevier Science BV | 2014-02-11Shunt linear voltage regulators are still used in situations where other kinds of regulators are not advised. This paper explores a mechanism liable to induce long duration pulses ( ~ 100 ? s ) in these devices, which is eventually demonstrated [...]![]()
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Fraile Prieto, Luis Mario ; Vedia Fernández, María Victoria ; otros, ... | Elsevier Science BV | 2018-12-01DTAS is a segmented total absorption y-ray spectrometer developed for the DESPEC experiment at FAIR. It is composed of up to eighteen NaI(Tl) crystals. In this work we study the performance of this detector with laboratory sources and also under[...]![]()
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Superconducting Tl_2Ba_2Cu_1O(6+?) ceramics shows two broad luminescence bands centered at 430 nm (2.9 eV) and 530 nm (2.3 eV) wich can not be related to impurity phases. The intensity of the bands is inhomogeneously distributed in the sample an[...]![]()
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We study quantum Chern-Simons theory as the large-mass limit of the limit D --> 3 of dimensionally regularized topologically massive Yang-Mills theory. This approach can also be interpreted as a BRS-invariant hybrid regularization of Chern-Simo[...]![]()
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In the general framework of chiral lagrangians we compute the leading log contribution to the three boson coupling in the standard model coming from eventual new physics. We apply the results, together with a complete analysis of the background [...]![]()
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We propose a method to derive the low-energy effective action of QCD assuming that the long-distance properties of strong interactions can be described by a string theory. We bypass the usual problems related to the existence of the tachyon and [...]![]()
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An effective SU(2)L X U(1)Y invariant chiral lagrangian can accommodate any symmetry breaking scheme in the standard model. It is shown that all process-independent quantities relevant to LEP precision measurements (DELTA-rho, DELTA-K and DELTA-[...]![]()
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Chronopotentiometric and swelling experiments have been conducted to characterize the behavior of a Nafion membrane in NaCl and KCl aqueous solutions without and with glucose. A mixture solution with similar composition to the cerebrospinal flui[...]![]()
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Barragán García, Vicenta María ; García Villaluenga, Juan Pedro ; Izquierdo Gil, María Amparo ; Godino Gómez, María Paz ; Seoane Rodríguez, Benjamín ; Ruiz Bauzá, Carlos | Elsevier Science BV | 2008-10-15Liquid permeation and uptake measurements of pure water and methanol were carried out using three commercial cation-exchange membranes: Nafion-117 (perfluorinated polyethylene with pendant ether-linked side chains terminated with sulfonated grou[...]![]()
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Galindo, R. ; Menendez, N. ; Crespo del Arco, Patricia ; Velasco, V. ; Bomati Miguel, O. ; Díaz Fernández, D. ; Herrasti, P. | Elsevier Science BV | 2014-06Nickel nanoferrites were obtained by means of four different synthetic wet-routes: co-precipitation (CP), sonochemistry (SC), sonoelectrochemistry (SE) and electrochemistry (E). The influence of the synthesis method on the structural and magneti[...]![]()
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Fisher's method of maximum likelihood breaks down when applied to the problem of estimating the five parameters of a mixture of two normal densities from a continuous random sample of size n. Alternative methods based on minimum-distance estimat[...]![]()
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UV-photografting using two different monomers, acrylic acid and N-vinylpyrrolidone, with different concentrations in an aqueous solution and various irradiation times were studied. Irreversible fouling of both the un-grafted polyethersulfone and[...]![]()
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Since transitivity is quite often violated even by decision makers that accept transitivity in their preferences as a condition for consistency, a standard approach to deal with intransitive preference elicitations is the search for a close enou[...]![]()
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El-Abbassi, A. ; Hafidi, A. ; García Payo, María del Carmen ; Khayet Souhaimi, Mohamed | Elsevier Science BV | 2009-09-15The possibility of olive mill wastewaters (OMW) treatment and concentration by membrane distillation has been investigated. The objective is to obtain pure water and a concentrate containing high amounts of polyphenols, which can be extracted la[...]