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Documentos disponibles de esta editorial (292)
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Martin Martinez, Eduardo ; Garay Elizondo, Luis Javier ; León, Juan | IOP publishing ltd | 2012-11-21We analyse the evolution of the entanglement of a non-trivial initial quantum field state (which, for simplicity, has been taken to be a bipartite state made out of vacuum and the first excited state) when it undergoes a gravitational collapse. [...]![]()
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Pisano, D. J. ; Kobulnicky, Henry A. ; Guzmán, Rafael ; Gallego Maestro, Jesús ; Bershady, Matthew A. | IOP publishing ltd | 2001-09We present Arecibo 21 cm spectroscopy, Keck HIRES H? spectroscopy, and WIYN R-band imaging of 11 nearby blue compact galaxies with effective B-band surface brightnesses of SBe = 19.4–21.2 mag arcsec^2 and effective radii of R_ eff = 0.6–1.9 kpc.[...]![]()
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Chiodo, G. ; García Herrera, Ricardo ; Calvo Fernández, Natalia ; Vaquero, J. M. ; Añel, J. A. ; Barriopedro Cepero, David ; Matthes, K. | IOP publishing ltd | 2016-03Solar variability represents a source of uncertainty in the future forcings used in climate model simulations. Current knowledge indicates that a descent of solar activity into an extended minimum state is a possible scenario. With aid of experi[...]![]()
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Bisigello, L. ; Caputi, K. I. ; Colina, L. ; Le Fèvre, O. ; Nørgaard-Nielsen, H. U. ; Pérez González, Pablo Guillermo ; Pye, J. ; Van der Werf, P. ; Ilbert, O. ; Grogin, N. ; Koekemoer, A. | IOP publishing ltd | 2016-12he determination of galaxy redshifts in the James Webb Space Telescope’s (JWST) blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST’s Near-Infrared Camera (NIRCam) at 0.6–5.0 ?m and Mid Infrared Inst[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; García, S. ; Fernández, M. | IOP publishing ltd | 1997-12SiNx:H thin films were deposited by the electron cyclotron resonance plasma method at low substrate temperature (200 degrees C) to fabricate metal-insulator-semiconductor devices. The effects of film properties on the electrical characteristics [...]![]()
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The scattering-matrix for planar Yang-Mills with N = 4 supersymmetry relies on the assumption that integrability holds to all orders in perturbation theory. In this note we define a map from the spectral variables x ±, parameterizing the long-ra[...]![]()
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The number of functionally independent scalar invariants of arbitrary order of a generic pseudo-Riemannian metric on an n-dimensional manifold is determined.![]()
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Arganda, E. ; Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2011-01Since data-taking began in January 2004, the Pierre Auger Observatory has been recording the count rates of low energy secondary cosmic ray particles for the self-calibration of the ground detectors of its surface detector array. After correctin[...]![]()
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Based on the eigenfunction symmetry constraint of the q-deformed modified KP hierarchy, a q-deformed mKP hierarchy with self-consistent sources (q-mKPHSCSs) is constructed. The q-mKPHSCSs contain two types of q-deformed mKP equation with self-co[...]![]()
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Arganda, E. ; Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2012-09The Pierre Auger Observatory is a facility built to detect air showers produced by cosmic rays above 10^17 eV. During clear nights with a low illuminated moon fraction, the UV fluorescence light produced by air showers is recorded by optical tel[...]![]()
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Arqueros Martínez, Fernando ; Rosado Vélez, Jaime ; Morcuende Parrilla, Daniel ; Contreras González, José Luis | IOP publishing ltd | 2019Cherenkov telescopes are also sensitive to the atmospheric fluorescence produced by the extensive air showers. However this contribution is neglected by the reconstruction algorithms of imaging air Cherenkov telescopes IACTs and wide-angle Chere[...]![]()
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The effect of the radiation reaction on the precession of a classical charged particle in a magnetic field is investigated. It is shown that the spin spirals around the field and becomes parallel or antiparallel to it, depending on the initial v[...]![]()
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Alemán, B. ; Hidalgo Alcalde, Pedro ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 2009-11-21Bi doped ZnO nanowires and rods have been grown by a catalyst free evaporation-deposition method with precursors containing either ZnO and Bi_2O_3 or ZnS and Bi_2O_3 powders. The use of ZnS as a precursor was found to lead to a higher density of[...]![]()
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The thermal resistance technique for measurement of the thermal conductivity of microporous thin membranes is described. A modified and enhanced Lees' disc apparatus was used. Several samples of membranes were held between a hot copper plate and[...]![]()
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The generalized Wick transform discovered by Thiemann provides a well established relation between the Euclidean and Lorentzian theories of general relativity. We extend this Thiemann transform to the Ashtekar formulation for gravity coupled wit[...]![]()
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The strong-coupling limit of three-point correlation functions of local operators can be analyzed beyond the supergravity regime using vertex operators representing spinning string states. When two of the vertex operators correspond to heavy str[...]![]()
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Varona Angulo, Santiago ; Ortiz Martín, Laura ; Viyuela, O. ; Martín-Delgado Alcántara, Miguel Ángel | IOP publishing ltd | 2018-10-03We compute the topological phase diagram of 2D tetragonal superconductors for the only possible nodeless pairing channels compatible with that crystal symmetry. Subject to a Zeeman field and spin-orbit coupling, we demonstrate that these superco[...]![]()
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Rollano, V. ; Muñoz Noval, Álvaro ; Gómez, A. ; Valdés Bango, F. ; Martín, J.I. ; Vélez, M. ; Osorio, M. R. ; Granados, D. ; González Herrera, Elvira María ; Vicent López, José Luis | IOP publishing ltd | 2019-06-14We have designed, fabricated and tested a robust superconducting ratchet device based on topologically frustrated spin ice nanomagnets. The device is made of a magnetic Co honeycomb array embedded in a superconducting Nb film. This device is bas[...]![]()
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Munarriz, J. ; Domínguez-Adame Acosta, Francisco ; Malyshev, Andrey | IOP publishing ltd | 2011-09-07A new type of quantum interference device based on a graphene nanoring in which all edges are of the same type is studied theoretically. The superposition of the electron wavefunction propagating from the source to the drain along the two arms o[...]![]()
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Calogero, F. ; Gómez-Ullate Otaiza, David ; Santini, P. M. ; Sommacal, M. | IOP publishing ltd | 2009-01-09We investigate the dynamics defined by the following set of three coupled first-order ODEs: (z) over dot (n) + i omega z(n) = g(n+2)/z(n) - z(n+1) + g(n+1)/z(n) - z(n+2) It is shown that the system can be reduced to quadratures which can be expr[...]![]()
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Méndez Martín, Bianchi ; Domínguez-Adame Acosta, Francisco ; Maciá Barber, Enrique Alfonso | IOP publishing ltd | 1993-01-07We show that the discretized forms of the Schrodinger and the Dirac equations for an arbitrary potential in one dimension are equivalent to the Poincare map of the corresponding wave equation for an array of delta-function potentials. Therefore,[...]![]()
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Vodola, Davide ; Amaro, David ; Martín-Delgado Alcántara, Miguel Ángel ; Mülller, Markus | IOP publishing ltd | 2018-08-06In this Letter, we establish and explore a new connection between quantum information theory and classical statistical mechanics by studying the problem of qubit losses in 2D topological color codes. We introduce a protocol to cope with qubit lo[...]![]()
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Magnetism of capped nanoparticles, NPs, of non- magnetic substances as Au and ZnO is briefly reviewed. The source of the magnetization is discussed on the light of recent X-ray magnetic circular dichroism experiments. As magnetic dichroism analy[...]![]()
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Two novel classes of many-body models with nonlinear interactions 'of goldfish type' are introduced. They are solvable provided the initial data satisfy a single constraint (in one case; in the other, two constraints), i.e., for such initial dat[...]![]()
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Zamorano Calvo, Jaime ; Gallego Maestro, Jesús ; Rego Fernández, Manuel ; Vitores, A. G. ; González Riestra, R. | IOP publishing ltd | 1992-09Multiwavelength observations of the galaxy UCM 2257+2438 found in the Universidad Complutense of Madrid (UCM) objective-prism survey are reported. The optic spectroscopy, CCD imaging, near-infrared and IRAS photometric data suggest that this obj[...]![]()
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In the paper under review, the authors show that some specific graded Lie superalgebras could induce specific quartic extensions of Lie algebras. Such construction is then applied to show that it can be associated naturally a quartic extension o[...]![]()
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Muñoz, M. C. ; Chico, L. ; López-Sancho, M. P. ; Beltrán Finez, Juan Ignacio ; Gallego, S. ; Cerdá, J. | IOP publishing ltd | 2006The symmetry underlying the geometric structure of materials determines most of their physical properties. In low dimensional systems the role of symmetry is enhanced and can give rise to new phenomena. Here, we report on unexpected magnetism in[...]![]()
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The capabilities of SEAM in uniformity assessment of SI GaAs are investigated. Profiles of SEAM signals across the wafer and SEAM images of dislocation distribution are obtained. Part of the nonlinear signal shows a profile that is not related t[...]![]()
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Mártil de la Plaza, Ignacio ; García Hemme, Eric ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | IOP publishing ltd | 2011-11-09We assess the degree of crystallinity by means of UV and visible Raman scattering measurements of Ti implanted Si layers with very high doses (10(15)-5 x 10(16) cm(-2)) subsequently annealed by nanosecond pulsed laser melting (PLM). We obtain ul[...]![]()
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Giménez, A. ; Ballester, J. L. ; Reglero, V. ; Fernández Figueroa, María José ; Castro Rubio, Elisa de | IOP publishing ltd | 1986-07Simultaneous uvby and H? photometry of thee noneclipsing double-lined spectroscopic binary TZ CrB, an active binary system with almost unevolved components, is presented. A small amplitude distortion wave (0.012 mag in y) has been found with max[...]![]()
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The vectorial extension of the Ribaucour transformation for the Lame equations bf orthogonal conjugate nets in multidimensions is given. We show that the composition of two vectorial Ribaucour transformations with appropriate transformation data[...]![]()
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Barrio Uña, Juan Abel ; Bonnefoy, Simon Francois Albert ; Contreras González, José Luis ; Dominguez, A. ; Fidalgo, D. ; Fonseca González, Mª Victoria ; López, M. ; Nievas Rosillo, Mireia | IOP publishing ltd | 2016-11We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescopes (MAGIC and VERITAS). While IceCube is capable of monitoring the[...]![]()
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Grigera, T.S. ; Martín Mayor, Víctor ; Parisi, G. ; Verrocchio, P. | IOP publishing ltd | 2002-03-11We study numerically and analytically a simple off-lattice model of scalar harmonic vibrations by means of Euclidean random matrix theory. Since the spectrum of this model shares the most puzzling spectral features with the high-frequency domain[...]![]()
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Given a semidirect product g = s ? r of semisimple Lie algebras s and solvable algebras r, we construct polynomial operators in the enveloping algebra U(g) of g that commute with r and transform like the generators of s, up to a functional facto[...]![]()
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Nogales Díaz, Emilio ; Garcia, J. A. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Lorenz, K. ; Alves, E. | IOP publishing ltd | 2008-03-20The luminescence properties of Er doped ?-Ga_2O_3 and of the erbium gallium garnet Er_3 Ga_5O_12(ErGG) have been investigated both in the visible and in the infrared (IR) ranges by means of photoluminescence (PL). Doping of the ?-Ga_2O_3 was obt[...]![]()
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Nogales Díaz, Emilio ; Montone, A. ; Cardellin, F. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2002-12There. has been interest in the past years in the visible luminescence properties of germanium nanocrystals. Most of the previous works refer to Ge nanocrystals embedded in an oxide matrix. In this work nanocrystalline germanium has been prepare[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2008-01-23Erbium doped ß-Ga_2O_3 nanowires and microwires have been obtained by a vapour-solid process from an initial mixture of ß-Ga_2O_3 and Er_2O_3 powders. X-ray diffraction (XRD) analysis reveals the presence of erbium gallium garnet as well as ß-Ga[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R ; Coraci, A. ; Garcia, J. A. | IOP publishing ltd | 2002Visible luminescence from erbium oxide layers grown on crystalline and amorphous silicon (c-Si and a-Si) has been investigated. The results show strong red and green cathodoluminescence bands due to intraionic Er3+ radiative transitions at room [...]![]()
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Ortega Villafuerte, Yanicet ; Dieker, Ch ; Jaeger, W. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma | IOP publishing ltd | 2010-06-04ZnO nanorods containing different hollow structures have been grown by a thermal evaporation-deposition method with a mixture of ZnS and SnO(2) powders as precursor. Transmission electron microscopy shows rods with rows of voids as well as rods [...]![]()
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Gómez, A. ; Valle Granda, Javier del ; González Herrera, Elvira María ; Chiliotte, C. E. ; Carreira, S. J. ; Bekeris, V. ; Prieto, J. L. ; Schuller, Ivan K. ; Vicent López, José Luis | IOP publishing ltd | 2014Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as are available in artificially produced structures.[...]![]()
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Caballero, J. A. ; López Santiago, Javier ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 2009-01We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the ? Orionis cluster and a background galaxy. Five stars displayed unambiguous flar[...]![]()
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Caballero, J. A. ; López Santiago, J. ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 2009-06We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a background galaxy. Five stars displayed unambiguous [...]