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Documentos disponibles de esta editorial (292)
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Hishiyama, N. ; Hoshino, M. ; Blanco Ramos, Francisco ; García, G. ; Tanaka, H. | IOP publishing ltd | 2017We report absolute electron elastic scattering differential cross sections (DCSs) from PF3 molecules. The crossed-beam method was used in conjunction with the relative flow technique (using helium as the reference gas) to obtain absolute values.[...]texto impreso
Bastarrachea Magnani A.; R, M. A. ; Relaño Pérez, Armando ; Lerma Hernández, S. ; López del Carpio, B. ; Chávez Carlos, J. ; Hirsch, J. G. | IOP publishing ltd | 2017-04-07Adiabatic invariants for the non-integrable Dicke model are introduced. They are shown to provide approximate second integrals of motion in the energy region where the system exhibits a regular dynamics. This low-energy region, present for any s[...]texto impreso
In this paper the Galilean, scaling and translational self-similarity conditions for the AKNS hierarchy are analysed geometrically in terms of the infinite-dimensional Grassmannian. The string equations of the one-matrix model correspond to the [...]texto impreso
We present high-fidelity, 30 mas (200 pc) resolution ALMA rest-frame 240 ?m observations of cold dust emission in three typical main-sequence star-forming galaxies (SFGs) at z ? 3 in the Hubble Ultra-Deep Field (HUDF). The cold dust is distribut[...]texto impreso
The authors present a mathematically exact formulation of the initial field striking the aperture of an absorbing optical waveguide, via an integral equation description. An analysis of the residual scattering by the waveguide is presented. Beca[...]texto impreso
Fernández Pérez, Luis Antonio ; Marinari, E. ; Martín Mayor, Víctor ; Parisi, V. ; Ruiz Lorenzo, J. J. | IOP publishing ltd | 2019-05-31Recent high precision experimental results on spin-glass films ask for a detailed understanding of the domain-growth dynamics of two-dimensional spin glasses. To achieve this goal, we numerically simulate the out-equilibrium dynamics of the Isin[...]texto impreso
Sebastián Franco, José Luis ; Muñoz San Martín, Sagrario ; Sancho Ruíz, Miguel ; Miranda Pantoja, José Miguel | IOP publishing ltd | 2006-12-07We calculate the induced electric stress forces on transient hydrophobic pores in the membrane of an erythrocyte exposed to an electric field. For this purpose, we use a finite element numerical technique and a realistic shape for the biconcave [...]texto impreso
Sebastián Franco, José Luis ; Muñoz San Martín, Sagrario ; Sancho Ruíz, Miguel ; Miranda Pantoja, José Miguel | IOP publishing ltd | 2001-01This paper shows the importance of using a cell model with the proper geometry, orientation and internal structure to study possible cellular effects from direct radiofrequency exposure. For this purpose, the electric field intensity is calculat[...]texto impreso
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 | 2012-10The Pierre Auger Observatory is exploring the potential of the radio detection technique to study extensive air showers induced by ultra-high energy cosmic rays. The Auger Engineering Radio Array (AERA) addresses both technological and scientifi[...]texto impreso
Beltrán Jiménez, José ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter K. S. ; Sáez Gómez, Diego | IOP publishing ltd | 2014-05-21One possible explanation for the present observed acceleration of the Universe is the breakdown of homogeneity and isotropy due to the formation of non-linear structures. How inhomogeneities affect the averaged cosmological expansion rate and le[...]texto impreso
Fernández Villacañas, J. L. ; Rego Fernández, Manuel ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 1990-06An intermediate-dispersion abundance analysis has been carried out on a sample of 21 barium and 14 comparison stars. The excess of barium over iron has been used as the most representative indicator of peculiarity. These excesses are higher in t[...]texto impreso
By means of a contactless microwave phase shift technique, the minority carrier lifetime and surface recombination velocity were measured in multicrystalline silicon wafers containing iron and chromium. The bulk lifetime can be deduced, leading [...]texto impreso
Dobado González, Antonio ; Cruz Dombriz, Álvaro de la ; López Maroto, Antonio | IOP publishing ltd | 2010In the context of f(R) gravity theories, the issue of finding static and spherically symmetric black hole solutions is addressed. Two approaches to study the existence of such solutions are considered: first, constant curvature solutions, and s[...]texto impreso
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 | 2013-05We derive lower bounds on the density of sources of ultra-high energy cosmic rays from the lack of significant clustering in the arrival directions of the highest energy events detected at the Pierre Auger Observatory. The density of uniformly d[...]texto impreso
We compute one of the bulk viscosity coeffcients of cold color -flavor locked ( CFL) quark matter in the temperature regime where the contribution of mesons, quarks and gluons to transport phenomena is Boltzmann suppressed. In that regime dissip[...]texto impreso
Arqueros Martínez, Fernando ; Aab, A. ; Abreu, P. ; Aglietta, M. ; Al Samarai, I. ; Albuquerque, I.F.M. ; Allekotte, I. ; Almela, A. ; Castillo, J. Alvarez ; Alvarez-Muiniz, J. ; otros, ... | IOP publishing ltd | 2017-10An in-situ calibration of a logarithmic periodic dipole antenna with a frequency coverage of 30 MHz to 80 MHz is performed. Such antennas are part of a radio station system used for detection of cosmic ray induced air showers at the Engineering [...]texto impreso
We numerically investigate the effects of inhomogeneities in the energy spectrum of aperiodic semiconductor superlattices, focusing our attention on Thue-Morse and Fibonacci sequences. In the absence of disorder, the corresponding electronic spe[...]texto impreso
It is shown that for inhomogeneous Lie algebras having only one Casimir operator, the latter can be explicitly constructed from the Maurer-Cartan equations by means of wedge products. It is further proved that this constraint imposes sharp bound[...]texto impreso
Garcia, J. A. ; Fernández Sánchez, Paloma ; Remon, A. ; Piqueras de Noriega, Javier ; Muñoz, V. ; Triboulet, R. | IOP publishing ltd | 2001-05Samples of zinc telluride bulk single crystals, which were deformed in uniaxial compression, have been studied by photoluminescence (PL) and cathodoluminescence (CL). As a particular feature the deformed samples present a PL emission band peaked[...]texto impreso
Fernández Sánchez, Paloma ; Garcia, J. A. ; Remon, A ; Piqueras de Noriega, Javier ; Muñoz, V. ; Triboulet, R. | IOP publishing ltd | 1998-04ZnTe single crystals grown by the cold travelling heater method have been investigated by means of photo-and cathodoluminescence. The spectral region covered in this work ranges from 2.48 eV (500 nm) which corresponds to band-edge emission to 0.[...]texto impreso
Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Sirbu, L. ; Tiginyanu, M. | IOP publishing ltd | 2005-12The luminescence of porous InP prepared by electrochemical etching is investigated by cathodoluminescence (CL) in a scanning electron microscope (SEM). Anodization causes a strong reduction of CL intensity as well as a blue spectral shift. Addit[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Hardalov, C. ; Sekiguchi, T. | IOP publishing ltd | 2001-10-07Bulk ZnO single crystals grown by the hydrothermal and flux methods have been characterized by steady-state and time resolved cathodoluminescence measurements performed on the different crystalline faces. A shift of the peak near band edge towar[...]texto impreso
Nogales Díaz, Emilio ; Hidalgo Alcalde, Pedro ; Lorenz, K. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Alves, E. | IOP publishing ltd | 2011-07-15Rare earth (RE) doped gallium oxide and germanium oxide micro- and nanostructures, mostly nanowires, have been obtained and their morphological and optical properties have been characterized. Undoped oxide micro- and nanostructures were grown by[...]texto impreso
Fernández, I. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2005-02In this work, the effect of different surface orientations on the defect structure of TiO2 single crystals and the evolution of the luminescence properties under plastic deformation are investigated by cathodoluminescence (CL) microscopy. The ma[...]texto impreso
Muñoz, Laura ; Fernández Ramírez, César ; Relaño Pérez, Armando ; Retamosa Granado, Joaquín | IOP publishing ltd | 2012In the last decade quantum chaos has become a well established discipline with outreach to different fields, from condensed-matter to nuclear physics. The most important signature of quantum chaos is the statistical analysis of the energy spectr[...]texto impreso
During the last three decades the quest for chaos in nuclei has been quite intensive, both with theoretical calculations using nuclear models and with detailed analyses of experimental data. In this paper we outline the concept and characteristi[...]texto impreso
The aim of this paper is to present a novel type of chaos observed in a four dimensional singularly perturbed system. The chaotic behavior is described both numerically and analytically. We show the existence of a new type of strange attractor r[...]texto impreso
Ramos Almeida, C. ; Rodríguez Espinosa, J. M. ; Barro, Guillermo ; Gallego Maestro, Jesús ; Pérez González, Pablo Guillermo | IOP publishing ltd | 2009-01We have employed a reliable technique of classification of active galactic nuclei (AGNs) based on the fit of well sampled spectral energy distributions (SEDs) with a complete set of AGN and starburst galaxy templates. We have compiled UV, optica[...]texto impreso
We reexamine the dynamical generation of mass for fermions charged under various Lie groups with equal charge and mass at a high Grand Unification scale, extending the Renormalization Group Equations in the perturbative regime to two loops and m[...]texto impreso
Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Vázquez Peñas, José Ramón ; otros, ... | IOP publishing ltd | 2017-04We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above 5.10(18) eV, i.e. the region[...]texto impreso
We obtain a criterion on the commutativity of polynomials in the enveloping algebra of a Lie algebra in terms of an involution condition with respect to the Berezin bracket. As an application, it is shown that the commutativity requirement of mi[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; San Andres Serrano, Enrique | IOP publishing ltd | 2005-10Oxide-semiconductor interface quality of high-pressure reactive sputtered (HPRS) TiO2 films annealed in O-2 at temperatures ranging from 600 to 900 degrees C, and atomic layer deposited (ALD) TiO2 films grown at 225 or 275 degrees C from TiCl4 o[...]texto impreso
The influence of the semiconductor doping type over the electrical properties of Al/SiNx :H/In0.53Ga0.47As metal-insulator-semiconductor (MIS) devices has been studied using capacitance-voltage (C-V) and current-voltage (I-V) measurements. The C[...]texto impreso
Barrio Uña, Juan Abel ; Bonnefoy, Simon ; Contreras González, José Luis ; Domínguez Díaz, Alberto ; Fidaldo, David Friedrich Contreras ; Fonseca González, Mª Victoria ; López Moya, Marcos ; Nievas Rosillo, Mireia ; Ahnen, M.L. ; Ansoldi, S. ; otros, ... | IOP publishing ltd | 2017-09Spontaneous breaking of Lorentz symmetry at energies on the order of the Planck energy or lower is predicted by many quantum gravity theories, implying non-trivial dispersion relations for the photon in vacuum. Consequently, gamma-rays of differ[...]texto impreso
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 | 2013A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10(18) eV at the Pierre Auger Observatory is reported. For the first time, these large-scale anisotropy searches are performed[...]texto impreso
We discuss an extended version of electromagnetism in which the usual gauge fixing term is promoted into a physical contribution that introduces a new scalar state in the theory. This new state can be generated from vacuum quantum fluctuations d[...]texto impreso
We show that the presence of a temporal electromagnetic field on cosmological scales generates an effective cosmological constant which can account for the accelerated expansion of the universe. Primordial electromagnetic quantum fluctuations pr[...]texto impreso
We consider a general class of vector-tensor theories of gravity and show that solutions with accelerated expansion and a future type III singularity are a common feature in these models. We also show that there are only six vector tensor theori[...]texto impreso
In this work we consider the most general electromagnetic theory in curved space-time leading to linear second order differential equations, including non-minimal couplings to the space time curvature. We assume the presence of a temporal electr[...]texto impreso
The study of the decay of neutron-rich Cs isotopes has two main objectives: on one side beta decay is a perfect tool to access the low-spin structures in the daughter Ba nuclei, where the evolution of octupole deformed shapes can be followed, wh[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Piqueras de Noriega, Javier ; Polenta, L. | IOP publishing ltd | 1996The influence of deep levels on the electrical and optical properties of semiconductors is widely acknowledged. We have utilized several complementary spectroscopic techniques to investigate the deep traps in undoped CdTe, CdTe:Cl and Cd0.8Zn0.2[...]texto impreso
Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Urbieta Quiroga, Ana Irene ; Rebane, Y. T. ; Shrete, Y. | IOP publishing ltd | 1999-05The influence of defects, in particular the deformation-induced defects, on the luminescence of bulk ZnSe single crystals has been investigated by cathodoluminescence (CL) in the scanning electron microscope. Deformation has been found to cause [...]texto impreso
We report on design, processing and characterization of AlGaAs/InGaAs/GaAs HFETs which feature the power capabilities of double delta-doped devices and the low noise performance of the standard HFETs. To study the influence of delta doping posit[...]texto impreso
A formulation for stationary axisymmetric electromagnetic fields in general relativity is derived by casting them into the form of an anisotropic fluid. Several simplifications of the formalism are carried out in order to analyse different featu[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2004-11Remote electron beam induced current (REBIC) and cathodoluminescence (CL) modes in the scanning electron microscope (SEM) have been used to investigate SnO2 sintered samples. The study of the electrically active boundaries present in the oxide s[...]texto impreso
A model for the diffusion of vector fields driven by external forces is proposed. Using the renormalization group and the epsilon-expansion, the dynamical critical properties of the model with Gaussian noise for dimensions below the critical dim[...]texto impreso
The dynamics of cold bosonic atoms held in an optical lattice can be profoundly modified by using a periodic driving potential to induce the quantum interference effect termed ”coherent destruction of tunneling”. In this way the entanglement and[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plaza, J. ; Dieguez, E. | IOP publishing ltd | 1998-12GaSb single crystals with different Er concentrations have been studied by cathodoluminescence in the scanning electron microscope. Low Er doping has been found to reduce the concentration of native accepters. In crystals with higher Er concentr[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P: S. ; Dieguez, E. | IOP publishing ltd | 1999-10The luminescence properties of In doped GaSb single crystals have been studied by the cathodoluminescence (CL) technique in the scanning electron microscope. It has been found that indium induces a certain reduction on the native acceptor concen[...]texto impreso
Panin, G. N. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 1996-09The effect of ion milling on the defect structure of CdTe crystals has been investigated in the scanning electron microscope by cathodoluminescence. Enhancement in the luminescence intensity is observed after ion treatment. Luminescence spectra [...]texto impreso
Lange, E. ; Krupa, K. ; Ameixa, J. ; Barbosa, A. S. ; Pastega, D. F. ; Limao-Vieira, P. ; Bettega, M. H. F. ; Blanco Ramos, Francisco ; García, G. ; Ferreira da Silva, F. | IOP publishing ltd | 2017In the present study joint experimental and theoretical elastic differential cross sections for electron scattering from dichloromethane in the incident electron energy region 7 to 50eV are discussed.texto impreso
Sebastián Franco, José Luis ; Muñoz San Martín, Sagrario ; Sancho Ruíz, Miguel ; Álvarez Galindo, Gabriel ; Miranda Pantoja, José Miguel | IOP publishing ltd | 2007-12-07We have studied the influence of the anisotropic and dispersive nature of the red blood cell structure on the energy absorption and electric field distribution within the cell exposed to electromagnetic fields of frequencies in the range from 50[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Polenta, L. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | IOP publishing ltd | 2002-12-16The study of the effect of extended defects, present in very large numbers in GaN epilayers, on the material properties and device performance is one of the most important aims of the current research in the field of III nitrides. Thickness stro[...]texto impreso
Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R | IOP publishing ltd | 2003-01Nanocrystalline silicon films, with an average nanocrystal size of about 10 nm, obtained by boron implantation of amorphous silicon layers, have been studied by remote-beam-induced current (REBIC) in a scanning tunnelling microscope (STM) and by[...]texto impreso
Mártil de la Plaza, Ignacio ; García Hemme, Eric ; García Hernansanz, Rodrigo ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | IOP publishing ltd | 2013-04-03We investigated the electrical transport properties of ultraheavily Ti-implanted silicon layers subsequently pulsed laser melted (PLM). After PLM, the samples exhibit anomalous electrical behaviour in sheet resistance and Hall mobility measureme[...]texto impreso
Electrical properties of high-pressure reactive sputtered thin hafnium oxide high-k gate dielectrics
Thin films of hafnium oxide have been deposited by the high-pressure reactive sputtering (HPRS) system. In this growth system the deposition pressure is around 1 mbar, three orders of magnitude higher than in the conventional ones, assuring that[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | IOP publishing ltd | 2001-07A comparative investigation of the characteristics of the SiNx:H/Si interface has been undertaken by capacitance-voltage measurements and surface photovoltage spectroscopy. By each of these techniques, we have determined the distribution of the [...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Tomashpolsky, Y. Y. ; Sadovskaya, N. V. ; Opagiste, C. | IOP publishing ltd | 1996-09Tl_2Ba-2CuO_(6+?) ceramics have been irradiated in a scanning electron microscope. The resultant changes in the cationic stoichiometry and oxygen content of the samples were investigated by cathodoluminescence (CL), secondary electron emission ([...]texto impreso
Panin, G. N. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | IOP publishing ltd | 1998-06A combined scanning electron microscope-scanning tunnelling microscope (SEM-STM) system has been used to characterize CdxHg1-xTe and CdTe crystals, The electron beam induced current (EBIC) mode of the SEM shows the existence of inhomogeneities i[...]texto impreso
Electrically active defects in epitaxial, n-type, 4H-SiC have been investigated by electron-beam-induced current (EBIC) in the scanning electron microscope. Several defects, mainly nanopipes, 6H polytype inclusions and triangular, carrot-like, d[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Méndez Martín, Bianchi ; Maciá Barber, Enrique Alfonso | IOP publishing ltd | 1994-03The electron dynamics and the density of states of both single and periodic Si delta-doped GaAs subject to an applied electric field are studied theoretically. The space charge potential due to delta-doping is obtained by means of the semiclassi[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier | IOP publishing ltd | 2009-04-21In this paper we show that pulsed laser melted high dose implantation of Ti in Si, above the Mott transition, produces an impurity band (IB) in this semiconductor. Using the van der Pauw method and Hall effect measurements we find strong laminat[...]texto impreso
Sochinskii, N. V. ; Dieguez, E. ; Pal, U. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Agullorueda, F. | IOP publishing ltd | 1995-06Undoped and doped CdTe wafers have been thermally annealed in Ga melt, or in Cd vapour or in a vacuum to eliminate Te precipitates from the volume of the wafers. The effect of annealing conditions on the transformation of Te precipitates has bee[...]texto impreso
The spatial context is criticalwhen assessing present-day climate anomalies, attributing them to potential forcings and making statements regarding their frequency and severity in a long-term perspective. Recent international initiatives have ex[...]texto impreso
The long-term relationship between temperature and hydroclimate has remained uncertain due to the short length of instrumental measurements and inconsistent results from climate model simulations. This lack of understanding is particularly criti[...]texto impreso
Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Garcia, J. A. | IOP publishing ltd | 2009-03-18Cathodoluminescence and photoluminescence techniques have been used to investigate room temperature light emission from ß-Ga_2O_3:Eu nanostructures, which were obtained by two methods. In one of them, a mixture of Ga_2O_3/Eu2O3 powders was used [...]texto impreso
Mármol Queraltó, E. ; Cardiel López, Nicolás ; Sánchez Blázquez, P. ; Trager, S. C. ; Peletier, R. F. ; Kuntschner, H. ; Silva, D. R. ; Cenarro, A. J. ; Vazdekis, A. ; Gorgas García, Francisco Javier | IOP publishing ltd | 2009-11-10The study of stellar populations in early-type galaxies in different environments is a powerful tool for constraining their star formation histories. This study has been traditionally restricted to the optical range, where dwarfs around the turn[...]texto impreso
We adapt the notion of the Darboux transformation to the context of polynomial Sturm-Liouville problems. As an application, we characterize the recently described X(m) Laguerre polynomials in terms of an isospectral Darboux transformation. We al[...]texto impreso
Enciso, Alberto ; Finkel Morgenstern, Federico ; González López, Artemio ; Rodríguez González, Miguel Ángel | IOP publishing ltd | 2007-02-23We present a detailed analysis of the spin models with near-neighbours interactions constructed in our previous paper (Enciso et al 2005 Phys. Lett. B 605 214) by a suitable generalization of the exchange operator formalism. We provide a complet[...]texto impreso
We present the detection and follow-up observations of planetary candidates around low-mass stars observed by the K2 mission. Based on light-curve analysis, adaptive-optics imaging, and optical spectroscopy at low and high resolution (including [...]texto impreso
Muñoz Muñoz, Laura ; Molina, R. A. ; Gómez Gómez, José María ; Heusler, A. | IOP publishing ltd | 2018Theoretical calculations, especially shell-model calculations, have shown a strongly chaotic behavior of bound states at higher excitation energy, in regions of high level density. However, it had not been possible up to now to observe chaos in [...]texto impreso
The time-reversed reaction O-15(2p, gamma) Ne-17 has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of Ne-20 in a beryllium production target and dissociated[...]texto impreso
In this paper a new formalism based on exterior differential systems is derived for perfect-fluid spacetimes endowed with an abelian orthogonally transitive G_2 group of motions acting on spacelike surfaces. This formulation allows simplificatio[...]texto impreso
Mogilevtsev, D. ; Teo, Y.S. ; ?ehá?ek, Jaroslav ; Hradil, Zdenek ; Tiedau, J. ; Kruse, R. ; Harder, Georg ; Silberhorn, C. ; Sánchez Soto, Luis Lorenzo | IOP publishing ltd | 2017-09-13The physical nature of any quantum source guarantees the existence of an effective Hilbert space of finite dimension, the physical sector, in which its state is completely characterized with arbitrarily high accuracy. The extraction of this sect[...]texto impreso
We consider the electronic transport through a Rashba quantum dot coupled to ferromagnetic leads. We show that the interference of localized electron states with resonant electron states leads to the appearance of the Fano-Rashba effect. This ef[...]texto impreso
Vidal, Marie ; Ibáñez García, Paula Beatriz ; Guerra, P. ; Valdivieso Casique, M. F. ; Rodrigues, R. ; Illane, C. ; Udías Moinelo, José Manuel | IOP publishing ltd | 2019-04Low energy x-ray intra-operative radiation therapy (IORT) is used mostly for breast cancer treatment with spherical applicators. X-ray IORT treatment delivered during surgery (ex: INTRABEAM (R), Carl Zeiss) can benefit from accurate and fast dos[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Maciá Barber, Enrique Alfonso ; Méndez Martín, Bianchi ; Roy, C.L. ; Khan, A. | IOP publishing ltd | 1995-06We report the theoretical electronic structure of Fibonacci superlattices of narrow-gap III-V semiconductors. The electron dynamics is accurately described within the envelope-function approximation in a two-band model. Quasiperiodicity is intro[...]texto impreso
We consider the following system: [GRAPHICS] which has been used as a model for various phenomena, including motion of species by chemotaxis and equilibrium of self-attracting clusters. We show that, in space dimension N = 3, (S) possess radial [...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; Lineros, R. ; López Maroto, Antonio | IOP publishing ltd | 2011Annihilation of different dark matter (DM) candidates into Standard Model (SM) particles could be detected through their contribution to the gamma ray fluxes that are measured on the Earth. The magnitude of such contributions depends on the part[...]texto impreso
Fluctuation theorems impose constraints on the probability of observing negative entropy production in small systems driven out of equilibrium. The range of validity of fluctuation theorems has been extensively tested for transitions between equ[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | IOP publishing ltd | 2006-03-28Samples of rutile TiO2 have been prepared by sintering compacted powders under argon flow. Long (above 20 h) sintering times at 1500 degrees C led to the formation of rods with squared cross-sections in a broad range of sizes. A two-step anneali[...]texto impreso
Storgards, J. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Chenot, M. ; Dimroth, F. ; Bett, A.V. | IOP publishing ltd | 2004-07The effect of electrochemical etching of n-type GaSb in aqueous solutions of HCl and HF has been analysed. By anodization in HCl, two different morphologies of porous layers were observed depending on the current density. At low current density [...]texto impreso
López, I. ; Castaldini, A. ; Cavallini, A. ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2014-10-15The behaviour of ß-Ga?O? nanowires as photoconductive material in deep ultraviolet photodetectors to operate in the energy range 3.0-6.2 eV has been investigated. The nanowires were grown by a catalyst-free thermal evaporation method on gallium [...]texto impreso
Gate quality of ex situ deposited Al/SiNx : H/n-In0.53Ga0.47As devices after rapid thermal annealing
Ex situ deposited SiNx:H/In0.53Ga0.47As metal-insulator-semiconductor devices, with a minimum of interface state density of 3.5 x 10(11) eV(-1) cm(-2) have been obtained by electron cyclotron resonance plasma method at a low substrate temperatur[...]texto impreso
The structure of the algebra of gauge-invariant differential forms on the bundle C × ME is determined, where p:C?M is the bundle of connections of a U(1) principal bundle ? : P?M, and E?M is the associated bundle to P by the representation ?r, r[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2005-11Thermal treatment of compacted GeO_2 powder under argon flow leads to the growth of a dense distribution of microwires and nanowires on the sample surface. Extended treatment causes the formation of more complex structures, including arrays of n[...]texto impreso
Munarriz, J. ; Domínguez-Adame Acosta, Francisco ; Orellana, P. A. ; Malyshev, Andrey | IOP publishing ltd | 2012-05-25We propose a novel spin filter based on a graphene nanoring fabricated above a ferromagnetic strip. The exchange interaction between the magnetic moments of the ions in the ferromagnet and the electron spin splits the electronic states, and give[...]texto impreso
We propose to use eigenvalue densities of unitary random matrix ensembles as mass distributions in gravitational lensing. The corresponding lens equations reduce to algebraic equations in the complex plane which can be treated analytically. We p[...]texto impreso
We propose to use eigenvalue densities of unitary random matrix ensembles as mass distributions in gravitational lensing. The corresponding lens equations reduce to algebraic equations in the complex plane which can be treated analytically. We p[...]texto impreso
In this work we report on the growth of Fe_(1-x)Gax films by means of the electrodeposition technique in baths containing sodium citrate as an antioxidant agent. We have investigated the effect of the electrolyte composition in terms of its Ga c[...]texto impreso
Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 2007-03-21Sintering of a ZnO-SnO_2 mixture under argon flow leads to the growth of microrods on the sample surface, which are formed by oriented stacks of nanoplates. Energy dispersive spectroscopy and cathodoluminescence ( CL) in the scanning electron mi[...]texto impreso
Sintering of ZnO pressed powder under Ar flow at temperatures between 1250 and 1300 degrees C leads to the formation of elongated microstructures and nanostructures, with different morphologies, on the sample surface. Rods and needles with cross[...]texto impreso
Given a field vacuum state in a black hole spacetime, this state can be analysed in terms of how it is perceived (in terms of particle content) by different observers. This can be done by means of the effective-temperature function introduced by[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2007-04-18High aspect ratio GeO_2 nano- and microwires have been grown by thermal treatment at 600 degrees C of compacted Ge powder under argon flow. The wires have cross-sectional dimensions from less than 100 nm to about 1 mu m, depending on the duratio[...]texto impreso
Compactifications of M-theory on manifolds with reduced holonomy arise as the local eleven-dimensional description of D6-branes wrapped on supersymmetric cycles in manifolds of lower dimension with a different holonomy group. Whenever the isomet[...]texto impreso
Reglero, V. ; Giménez, A. ; Fabregat, J. ; Castro Rubio, Elisa de ; Fernández Figueroa, María José ; Castro, A. de | IOP publishing ltd | 1988-05From 1984 to 1986, we made several observational campaigns at Calar Alto and La Palma Observatories using the uvby and ß photometric systems to monitor a selected sample of late-type variable stars. In this paper we present the ß values for 38 [...]texto impreso
We analyse changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black-hole physics. We show that the effective value deduced for the Planck[...]texto impreso
Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2017-02Atmospheric conditions, such as the pressure (P), temperature (T) or air density (rho proportional to P/T), affect the development of extended air showers initiated by energetic cosmic rays. We study the impact of the atmospheric variations on t[...]texto impreso
Román, L.E. ; Amézquita, M.J. ; Uribe, C.L. ; Maurtua, D.J. ; Costa, S.A. ; Costa, S.M. ; Keiski, R. ; Solís, J.L. ; Gómez, M.M. | IOP publishing ltd | 2020-12-14T16:10:07ZThe application of nanotechnology has gained importance in the finishing of textile products, imparting them functional properties, which are achieved without affecting the textile. A novel method was developed for the in situ growth of CuO nano[...]texto impreso
Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Häußler, Dietrich ; Jäger, Wolfgang | IOP publishing ltd | 2013-10-02ZnO nanorods with Sn core regions grown by a thermal evaporation–deposition method from a mixture of SnO_2 and ZnS powders as precursors, are used to study the behaviour of liquid metal in the nanotubes' core regions and the formation of liquid [...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | IOP publishing ltd | 1994Homogeneity, distribution and nature of defects in GaAs:Te wafers with different doping concentrations have been investigated by SPV (Surface PhotoVoltage) and EBIC (Electron Beam Induced Current) methods. The resulting radial distribution of th[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 1998-08The effect of indentation on the cathodoluminescence (CL) of GaN:Si epitaxial films has been investigated in the scanning electron microscope. Deformation produces changes in the defect structure which are monitored through the changes induced i[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Vicent López, José Luis ; Piqueras de Noriega, Javier ; Dieguez, E. | IOP publishing ltd | 2007-01-07The influence of the doping level on the radiative recombination properties of GaSb:Se crystals has been investigated by cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope. CL images evidence a high dislocat[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P. S. ; Dieguez, E. | IOP publishing ltd | 1997Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the effect of doping with chromium and vanadium on the native accepters and on the general structure of extended defects of gallium antimonide single[...]texto impreso
López, I ; Alonso Orts, Manuel ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2016-11Gallium oxide microrods have been grown by an evaporation-deposition method by using a precursor containing lithium in order to check the influence of such dopant on the morphology and physical properties of the obtained ß-Ga_2O_3 structures. SE[...]texto impreso
This paper presents a procedure to improve the algorithm of Sangiorgi, Ricco and Venturi for the calculation of the time of flight in Monte Carlo simulations. The method is used to efficiently optimize the step function in which the total scatte[...]texto impreso
García Hemme, Eric ; Montero Álvarez, Daniel ; García Hernansanz, Rodrigo ; Olea Ariza, Javier ; Mártil de la Plaza, Ignacio ; González Díaz, Germán | IOP publishing ltd | 2016-07-13We report the observation of the insulator-to-metal transition in crystalline silicon samples supersaturated with vanadium. Ion implantation followed by pulsed laser melting and rapid resolidification produce high quality single-crystalline sili[...]texto impreso
We analyze under which conditions the missing label problem associated to a reduction chain s? ? s of (simple) Lie algebras can be completely solved by means of an In¨on¨u-Wigner contraction g naturally related to the embedding. This provides a [...]texto impreso
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 | 2013-02To interpret the mean depth of cosmic ray air shower maximum and its dispersion, we parametrize those two observables as functions of the first two moments of the ln A distribution. We examine the goodness of this simple method through simulatio[...]texto impreso
Galaxy interactions and mergers are thought to play an important role in the evolution of galaxies. Studies in the nearby universe show a higher AGN fraction in interacting and merging galaxies than their isolated counterparts, indicating that s[...]texto impreso
Rego Fernández, Manuel ; Cordero Gracia, M. ; Zamorano Calvo, Jaime ; Gallego Maestro, Jesús | IOP publishing ltd | 1993-02We present the results of IRAS observations of the UCM (Universidad Complutense de Madrid) sample of emission-line galaxies, which have been selected from wide-dispersion H_? objective-prism plates. These data are intended to provide a convenien[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]texto impreso
Ballesteros, H. G. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Parisi, G. ; Ruiz Lorenzo, J. J. | IOP publishing ltd | 1997-12-21We study the site-diluted Ising model in two dimensions with Monte Carlo simulations. Using finite-size scaling techniques we compute the critical exponents observing deviations from the pure Ising ones. The differences can be explained as the e[...]texto impreso
We analyze the isospin-breaking corrections to quark condensates within one-loop SU(2) and SU(3) chiral perturbation theory including m(u) not equal m(d) as well as electromagnetic (EM) contributions. The explicit expressions are given and sever[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, Santos José | IOP publishing ltd | 2014-03We show that the energy-momentum tensor of homogeneous fields of arbitrary spin in an expanding universe is always isotropic in average provided the fields remain bounded and evolve rapidly compared to the rate of expansion. An analytic expressi[...]texto impreso
We work out the junction conditions forf(R) gravity formulated in metric-affine (Palatini) spaces using a tensor distributional approach. These conditions are needed for building consistent models of gravitating bodies with an interior and exter[...]texto impreso
It is shown that there exist electromagnetic knots, which are standard electromagnetic fields in which any pair of magnetic lines whatsoever (or of electric lines) are linked and the magnetic helicity has the value ƒ A * B d^(3)r = na, "n" being[...]texto impreso
We study theoretically the level shift of massless Dirac fermions in a graphene monolayer subjected to a quantizing perpendicular magnetic field under the influence of short-range impurities. A Green function method is used to obtain closed expr[...]texto impreso
Álvarez Galindo, Gabriel ; Martínez Alonso, Luis ; Medina Reus, Elena | IOP publishing ltd | 2011-07-15We present a method to characterize and compute the large N formal asymptotics of regular and critical Hermitian matrix models with general even potentials in the one-cut and two-cut cases. Our analysis is based on a method to solve continuum li[...]texto impreso
Large-scale matter bulk flows with respect to the cosmic microwave background have very recently been detected on scales less than or similar to 100h(-1) Mpc and less than or similar to 300h(-1) Mpc by using two different techniques showing an e[...]texto impreso
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 | 2012-12A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10(18) eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and right a[...]texto impreso
Aranda, V. M. ; Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Rosado, J. ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2015-04-01We present the results of an analysis of the large angular scale distribution of the arrival directions of cosmic rays with energy above 4 EeV detected at the Pierre Auger Observatory including for the first time events with zenith angle between[...]texto impreso
The search for detection of ?-rays from distant AGNs by Imaging Atmospheric Cherenkov Telescopes (IACTs) is challenging at high redshifts, not only because of lower flux due to the distance of the source, but also due to the consequent absorptio[...]texto impreso
Llanes Estrada, Felipe José ; Dobado González, Antonio ; Delgado López, Rafael | IOP publishing ltd | 2014-02The claimed finding of a light Higgs boson makes the minimal Standard Model unitary. Yet, we recall that the general low-energy dynamics for the minimal electroweak symmetry breaking sector with three Goldstone bosons and one light scalar is not[...]texto impreso
It is shown that under certain conditions the limit speed of electric charges moving in a space of type R-n of dimension one or two, under isotropic friction, is preserved under some perturbations. These results hold when relativistic equations [...]texto impreso
Mehboudi, Mohammad ; Rodríguez Parrondo, Juan Manuel ; Acin, Antonio | IOP publishing ltd | 2019-08-21Fluctuation dissipation theorems (FDTs) connect the linear response of a physical system to a perturbation to the steady-state correlation functions. Until now, most of these theorems have been derived for finite-dimensional systems. However, ma[...]texto impreso
We present a long-term assessment of precipitation trends in Southwestern Europe (1850–2018) using data from multiple sources, including observations, gridded datasets and global climate model experiments. Contrary to previous investigations bas[...]texto impreso
Martin Benito, M. ; Garay Elizondo, Luis Javier ; Mena Marugán, Guillermo A. ; Wilson-Ewing, E. | IOP publishing ltd | 2012We complete the canonical quantization of the vacuum Bianchi I model within the improved dynamics scheme of loop quantum cosmology, characterizing the Hilbert structure of the physical states and providing a complete set of observables acting on[...]texto impreso
Chioncel, M. F. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | IOP publishing ltd | 2004-03Cathodoluminescence in the scanning electron microscope has been used to investigate the effect of plastic deformation, produced by indentation, in Te-doped GaSb crystals. Deformation has been found to cause a strong quenching of the luminescenc[...]texto impreso
Radoi, R. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Wiggins, M. S. ; Solís, J. | IOP publishing ltd | 2003-07The effect of mechanical milling on the luminescence properties of ZnO microcrystalline samples has been studied by means of cathodoluminescence in a scanning electron microscope. The samples consisted of pressed pellets of commercially availabl[...]texto impreso
Núñez, A. ; Pérez García, Lucas ; Abuín Herráez, Manuel ; Araujo, J. P. ; Proenca, M. P. | IOP publishing ltd | 2017-04-20Understanding the magnetic behaviour of multisegmented nanowires (NWs) is a major key for the application of such structures in future devices. In this work, magnetic/non-magnetic arrays of FeCoCu/Cu multilayered NWs electrodeposited in nanoporo[...]texto impreso
Gallego, S. ; Beltrán Finez, Juan Ignacio ; Cerdá, J. ; Muñoz, M.C. | IOP publishing ltd | 2005-11-02The occurence of spin-polarization at ZrO_(2), Al_(2)O_(3) and MgO surfaces is proved by means of abinitio calculations within the density functional theory. Large spin moments, as high as 1.56 µB, develop at O-ended polar terminations, transfor[...]texto impreso
The reactions C-13(alpha,n)O-16 and Ne-22(alpha,n)Mg-25 are the primary sources of neutrons for the astrophysical s-process. The feasibility of cross section measurements within the respective Gamow windows is discussed in quantitative terms for[...]texto impreso
Aguirre Aguirre, D. ; Izazaga Pérez, R. ; Villalobos Mendoza, B. ; Carrasco, E. ; Gil de Paz, Armando ; Gallego Maestro, Jesús ; Iglesias, J. | IOP publishing ltd | 2017MEGARA is the new integral-field and multi-object optical spectrograph for the GTC. For medium and high resolution, the dispersive elements are volume phase holographic gratings, sandwiched between two flat windows and two prisms of high optical[...]texto impreso
Llanes Estrada, Felipe José ; Torres Rincón, Juan M. ; Abreu, Luciano M. ; Cabrera, Daniel ; Tolos, Laura | IOP publishing ltd | 2014We present effective-field-theory results with unitarized interactions on the D-meson transport coefficients in a gas populated by light mesons and baryons at finite temperature and baryochemical potential. The Fokker-Planck equation is used to [...]texto impreso
García Hemme, Eric ; García Hernansanz, Rodrigo ; Olea Ariza, Javier ; Pastor Pastor, David ; Prado Millán, Álvaro del ; Mártil de la Plaza, Ignacio ; González Díaz, Germán | IOP publishing ltd | 2015-02-25This paper presents the results for the transverse conductance across a bilayer formed by supersaturating with diverse transition metals a thin layer of a silicon wafer. The layer is formed by ion implantation and annealed by pulsed laser meltin[...]texto impreso
We present microwave noise measurements performed on different high electron mobility transistor channels under both darkness and illumination. Two structures of Alo(0.3)Gao(0.7)As/GaAs layers have been grown with beams of Asp and As-4 using mol[...]texto impreso
Optical crosstalk seriously limits the photon-counting resolution of silicon photomultipliers. In this work, realistic analytical models to describe the crosstalk effects on the response of these photodetectors are presented and compared with ex[...]texto impreso
Cermeño, M. ; Carro, J. ; López Maroto, Antonio ; Pérez García, M. A. | IOP publishing ltd | 2019-02-20Using a perturbative approach we solve stellar structure equations for low-density (solar-type) stars whose interior is described with a polytropic equation of state in scenarios involving a subset of modified gravity (MG) theories. Rather than [...]texto impreso
We describe a new way of obtaining the Morse equations of a Morse decomposition of an isolated invariant set. This is achieved through a filtration of truncated unstable manifolds associated with the decomposition. The results in the paper make [...]texto impreso
Paliya, Vaidehi S. ; Böttcher, M. ; Olmo García, A. ; Dominguez, A. ; Gil de Paz, Armando ; Franckowiak, A. ; Garrappa, S. ; Stein, R. | IOP publishing ltd | 2020-10The recent spatial and temporal coincidence of the blazar TXS 0506+056 with the IceCube-detected neutrino event IC-170922A has opened up a realm of multimessenger astronomy with blazar jets as a plausible site of cosmic-ray acceleration. After T[...]texto impreso
The Riemann-Hilbert problems for multiple orthogonal polynomials of types I and II are used to derive string equations associated with pairs of Lax-Orlov operators. A method for determining the quasiclassical limit of string equations in the pha[...]texto impreso
Gálvez, M. C. ; Montes Gutiérrez, David ; Fernández Figueroa, María José ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 2009-04This paper describes a multiwavelength optical study of chromospheres in two X-ray/EUV-selected active binary stars with strong H alpha emission, V789 Mon (2RE J0725-002) and GZ Leo (2RE J1101+223). The goal of the study is to determine radial v[...]texto impreso
Arqueros Martínez, Fernando ; Aab, A. ; Abreu, P. ; Aglietta, M. ; Ahn, E.J. ; Al Samarai, I. ; Albuquerque, I.F.M. ; Allekotte, I. ; Allison, P. ; Almela, A. ; otros, ... | IOP publishing ltd | 2017-03AMIGA (Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory designed to extend its energy range of detection and to directly measure the muon content of the cosmic ray primary particle showers. The array wil[...]texto impreso
Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2016-01To exploit the full potential of radio measurements of cosmic-ray air showers at MHz frequencies, a detector timing synchronization within 1 ns is needed. Large distributed radio detector arrays such as the Auger Engineering Radio Array (AERA) r[...]texto impreso
Lope Oter, Eva ; Windisch, Andreas ; Llanes Estrada, Felipe José ; Alford, Mark | IOP publishing ltd | 2019-08We contribute a publicly available set of tables and code to provide equations of state (EoS) for matter at neutron star densities. Our EoS are constrained only by input from hadron physics and fundamental principles, without feedback from neutr[...]texto impreso
For pt.I see ibid., vol.17, p.475 (1984). The possible confined propagation of slow (thermal) neutrons along cladded waveguides of small cross section (fibres) is studied, in order to improve a previously published analysis. Quite suitable possi[...]texto impreso
The authors study confined propagation of slow (thermal) neutrons along (non-hollow) solid fibres made of certain elements (Ti, Mn, ...) such that amplitude for the low-energy nuclear scattering of neutrons on them be negative. Geometrical optic[...]texto impreso
The confined propagation of slow neutrons along waveguides of a small cross section (fibres), discussed theoretically some time ago and demonstrated experimentally by other authors later, is analysed further. Motivated by those experiments, a th[...]texto impreso
A new first integral for the equations corresponding to twisting type-N vacuum gravitational fields with two non-commuting Kilting vectors is introduced. A new reduction of the problem to a complex second-order ordinary differential equation is [...]texto impreso
We present a method to sum Borel- and Gevrey-summable asymptotic series by matching the series to be summed with a linear combination of asymptotic series of known functions that themselves are scaled versions of a single, appropriate, but other[...]texto impreso
Introducing a surface layer of matter on the edge of a neutron star in slow rigid rotation, we analyze, from an intrinsic point of view, the junction conditions that must be satisfied between the interior and exterior solutions of the Einstein e[...]texto impreso
In this work we calculate the low-energy effective action for gravity with torsion, obtained after the integration of scalar and fermionic matter fields, using the local momentum representation based on the Riemann normal coordinates expansion. [...]texto impreso
Alvarez Rodríguez, R. ; Fraile Prieto, Luis Mario ; López Herraiz, Joaquin ; Martinez Pérez, M. ; Moreno, O. ; Udías Moinelo, José Manuel | IOP publishing ltd | 2016The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-proc[...]texto impreso
Ivanov, M. V. ; Antonov, A. N. ; Megías, G. D. ; González-Jiménez, R. ; Bárbaro, M. B. ; Caballero, J. A. ; Donnelly, T. W. ; Udías Moinelo, José Manuel | IOP publishing ltd | 2018We compare the characteristics of the charged-current quasielastic (anti)neutrino scattering obtained in two different nuclear models, the phenomenological SuperScaling Approximation and the model using a realistic spectral function S(p, epsilon[...]texto impreso
González Adalid Pemartín, Isidoro ; Martín Mayor, Víctor ; Parisi, G. ; Ruiz Lorenzo, J.J. | IOP publishing ltd | 2019-03-29We study the problem of glassy relaxations in the presence of an external field in the highly controlled context of a spin-glass simulation. We consider a small spin glass in three dimensions (specifically, a lattice of size L = 8, small enough [...]texto impreso
Duncan, Kenneth ; Conselice, Christopher J. ; Mundy, Carl ; Bell, Eric ; Donley, Jennifer ; Galametz, Audrey ; Guo, Yicheng ; Grogin, Norman A. ; Hathi, Nimish ; Kartaltepe, Jeyhan ; Kocevski, Dale ; Koekemoer, Anton M. ; Pérez González, Pablo Guillermo ; Mantha, Kameswara B. ; Snyder, Gregory F. ; Stefanon, Mauro | IOP publishing ltd | 2019-05-08Galaxy mergers are expected to have a significant role in the mass assembly of galaxies in the early universe, but there are very few observational constraints on the merger history of galaxies at z > 2. We present the first study of galaxy maj[...]texto impreso
Ivy, Diane J. ; Solomon, Susan ; Calvo Fernández, Natalia ; Thompson, David W. J. | IOP publishing ltd | 2017-02We present observational evidence for linkages between extreme Arctic stratospheric ozone anomalies in March and Northern Hemisphere tropospheric climate in spring (March-April). Springs characterized by low Arctic ozone anomalies in March are a[...]texto impreso
We examine a case study where classical evolution emerges when observing a quantum evolution. By using a single-mode quantum Kerr evolution interrupted by measurement of the double-homodyne kind (projecting the evolved field state into classical[...]texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; Rodríguez González, Miguel Ángel | IOP publishing ltd | 1999-10-01We show that there are two different families of (weakly) orthogonal polynomials associated to the quasi-exactly solvable Razavy potential V_ (x) = (? cosh 2x?M)^ 2 (? > 0, M ? N). One of these families encompasses the four sets of orthogonal p[...]texto impreso
Albareti, F. D. ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio | IOP publishing ltd | 2013-07Raychaudhuri equation is found provided that particular energy conditions are assumed and regardless the considered solution of the Einstein's equations. This fact is usually interpreted as a manifestation of the attractive character of gravity.[...]texto impreso
We have derived the uncertainties to be expected in the derivation of galaxy physical properties (star formation history, age, metallicity, and reddening) when comparing broadband photometry to the predictions of evolutionary synthesis models. W[...]texto impreso
The effect of the radiation reaction on the motion of an extended classical charged particle in a magnetic field is investigated. The expression of the self-torque is obtained and it is shown that there are radiationless self-sustained oscillati[...]texto impreso
A comprehensive stratosphere-resolving atmospheric model, with interactive stratospheric ozone chemistry, coupled to ocean, sea ice and land components is used to explore the tropospheric and surface impacts of large springtime ozone anomalies i[...]texto impreso
We investigate the galaxy quenching process at intermediate redshift using a sample of similar to 4400 galaxies with M-* > 10(9) M-circle dot between redshift 0.5 and 1.0 in all five CANDELS fields. We divide this sample, using the integrated sp[...]texto impreso
Piqueras de Noriega, Javier ; Vila Santos, María ; Díaz-Guerra Viejo, Carlos | IOP publishing ltd | 2010-04-07CuO nanostructures with different morphologies, such as single-crystal nanowires, nanoribbons and nanorods, have been grown by thermal oxidation of copper in the 380–900?°C temperature range. Cathodoluminescence spectra of the nanostructures sho[...]texto impreso
Thin films of hafnium oxide ( HfO2) have been grown by high pressure reactive sputtering on transparent quartz substrates ( UV- grade silica) and silicon wafers. Deposition conditions were adjusted to obtain polycrystalline as well as amorphous [...]texto impreso
Alcalde Pampliega, Belén ; Pérez González, Pablo Guillermo ; Barro, Guillermo ; Domínguez Sánchez, Helena ; Eliche Moral, M. Carmen ; Cardiel López, Nicolás ; Hernán Caballero, Antonio ; Rodríguez Muñoz, Lucía ; Sánchez Blázquez, Patricia ; Esquej, Pilar | IOP publishing ltd | 2019-05-10We present a sample of 33 Balmer break galaxies (BBGs) selected as Hubble Space Telescope/F160W dropouts in the deepest CANDELS/GOODS fields (H > /~ 27.3 mag) but relatively bright in Spitzer/IRAC ([3.6], [4.5]texto impreso
Antoranz Canales, Pedro ; Bonnefoy, Simon Francois Albert ; Barrio Uña, Juan Abel ; Contreras González, José Luis ; Fonseca González, Mª Victoria ; López Moya, Marcos ; Miranda Pantoja, José Miguel ; Satalecka, Konstanzja ; Scapin, Valeria | IOP publishing ltd | 2014-02We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-quality data, this is the deepest observational campaign on any dwarf[...]texto impreso
Sols Lucía, Fernando ; Heimsoth, M. ; Creffield, Charles E. ; Carr, L.D. | IOP publishing ltd | 2012-07-26In a system of ac-driven condensed bosons we study a new type of Josephson effect occurring between states sharing the same region of space and the same internal atom structure. We first develop a technique to calculate the long-time dynamics of[...]texto impreso
Fernández Pérez, Luis Antonio ; Marinari, E. ; Martín Mayor, Víctor ; Parisi, G. ; Ruiz Lorenzo, J.J. | IOP publishing ltd | 2018-10We consider the spatial correlation function of the two-dimensional Ising spin glass under out-equilibrium conditions. We pay special attention to the scaling limit reached upon approaching zero temperature. The field-theory of a non-interacting[...]texto impreso
Parafermions of orders 2 and 3 are shown to be the fundamental tool to construct superspaces related to cubic and quartic extensions of the Poincaré algebra. The corresponding superfields are constructed, and some of their main properties are an[...]texto impreso
Parafermions of orders 2 and 3 are shown to be the fundamental tool to construct superspaces related to cubic and quartic extensions of the Poincaré algebra. The corresponding superfields are constructed, and some of their main properties are an[...]texto impreso
We give an exposition of the 1972 parametrization method of Kuchar in the context of the multisymplectic approach to field theory. The purpose of the formalism developed here is to make any classical field theory, containing a metric as a sole b[...]texto impreso
We consider the problem of parametrizing modified gravity theories that include an additional vector field in the sub-Hubble regime within the quasi-static approximation. We start from the most general set of second order equations for metric an[...]texto impreso
We present an implementation of the method of orthogonal polynomials which is particularly suitable to study the partition functions of Penner random matrix models, to obtain their explicit forms in the exactly solvable cases, and to determine [...]texto impreso
Barrio Uña, Juan Abel ; Contreras González, José Luis ; Domínguez Díaz, Alberto ; Carreto Fidalgo, David Friedrich ; Fonseca González, Victoria ; Hoang, Kim Dinh ; López Moya, Marcos ; Nievas Rosillo, Mireia ; Peñil del Campo, Pablo ; Saha, Lab | IOP publishing ltd | 2018-11-01We report on observations of the pulsar/Be star binary system PSR J2032+4127/MT91 213 in the energy range between 100 GeV and 20 TeV with the Very Energetic Radiation Imaging Telescope Array and Major Atmospheric Gamma Imaging Cherenkov telescop[...]texto impreso
Relaño Pérez, Armando ; Molina, R. A. ; Retamosa Granado, Joaquín ; Muñoz, L. ; Faleiro, E. ; Gómez Gómez, José María | IOP publishing ltd | 2010The power spectrum of the ?_(n) statistic of quantum spectra presents 1/ƒ^(?) noise. For chaotic systems ? = 1 while for regular systems ? = 2. Although the transition from regularity to chaos is non universal, for a wide variety of systems wi[...]texto impreso
López Maroto, Antonio ; Beltrán Jiménez, José ; Koivisto, Tomi S. ; Fonseca Mota, David | IOP publishing ltd | 2009-10It has been recently proposed that the presence of a temporal electromagnetic field on cosmological scales could explain the phase of accelerated expansion that the universe is currently undergoing. The field contributes as a cosmological consta[...]texto impreso
Álvarez Galindo, Gabriel ; Martínez Alonso, Luis ; Medina Reus, Elena | IOP publishing ltd | 2017-03-24The partition function of the Penner matrix model for both positive and negative values of the coupling constant can be explicitly written in terms of the Barnes G function. In this paper we show that for negative values of the coupling constant[...]texto impreso
Giza, Olivia M. ; Sánchez Parcerisa, Daniel ; Sánchez-Tembleque Verbo, Victor ; López Herraiz, Joaquin ; Camacho, Jorge ; Avery, Stephen ; Udías Moinelo, José Manuel | IOP publishing ltd | 2019-04This work describes all stages of development (setup, optimization, performance, and first experimental measurements) of an acoustic sensor that can be used for range monitoring and dosimetry of clinical radiotherapy beams. The detection device [...]texto impreso
Santos Santos, Isabel ; Domínguez Tenreiro, Rosa ; Artal, Héctor ; Pedrosa, Susana E. ; Bignone, Lucas ; Martínez Serrano, Francisco ; Gómez Flechoso, María de los Ángeles ; Tissera, Patricia B. ; Serna, Arturo | IOP publishing ltd | 2020-07We address the “plane of satellites problem” by studying planar configurations around two disk galaxies with no late major mergers, formed in zoom-in hydro-simulations. Due to the current lack of good-quality kinematic data for M31 satellites, w[...]texto impreso
Monaico, E. ; Ursaki, V. V. ; Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Boyd, R. W. ; Tiginyanu, I. M. | IOP publishing ltd | 2004-12Porous CdSe layers have been produced by anodic etching of crystalline substrates in a HCl solution. Anodization under in situ. UV illumination resulted in the formation of uniformly distributed parallel pores with a diameter of 30 nm, stretchin[...]texto impreso
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effective field theory for the four experimentally known particles (W_L^±, Z_L, h) and its dispersion-relation based unitary extensi[...]texto impreso
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effectie field theory for the four experimentally known particles (W^(±)_(L), Z_(L), h) and its dispersion-relation based unitary ex[...]texto impreso
Moreno Casares, Pablo Antonio ; Martín-Delgado Alcántara, Miguel Ángel | IOP publishing ltd | 2020-07Adversarial attacks represent a serious menace for learning algorithms and may compromise the security of future autonomous systems. A theorem by Khoury and Hadfield-Menell (KH), provides sufficient conditions to guarantee the robustness of acti[...]texto impreso
Bayat, Abolfazl ; Creffield, Charles E. ; Jefferson, John H ; Pepper, Michael ; Bose, Sougato | IOP publishing ltd | 2015-10We show how single quantum dots, each hosting a singlet-triplet qubit, can be placed in arrays to build a spin quantum cellular automaton. A fast (? 10 ns) deterministic coherent singlet- triplet filtering, as opposed to current incoherent tunne[...]texto impreso
Dauphinais, Guillaume ; Ortiz Martín, Laura ; Varona Angulo, Santiago ; Martín Delgado, Miguel Ángel | IOP publishing ltd | 2019-05-29We present a full quantum error correcting procedure with the semion code: an off-shell extension of the double-semion model. We construct open-string operators that recover the quantum memory from arbitrary errors and closed-string operators th[...]texto impreso
Martin- Benito, M. ; Garay Elizondo, Luis Javier ; Mena Marugán, Guillermo A. | IOP publishing ltd | 2011The linearly polarized Gowdy T(3) model can be regarded as compact Bianchi I cosmologies with inhomogeneous modes allowed to travel in one direction. We study a hybrid quantization of this model that combines the loop quantization of the Bianchi[...]texto impreso
We introduce a new quantum optimization algorithm for dense linear programming problems, which can be seen as the quantization of the interior point predictor-corrector algorithm [1] using a quantum linear system algorithm [2]. The (worst case) [...]texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; Rodríguez González, Miguel Ángel | IOP publishing ltd | 1997-10-07In this paper, we study Lie superalgebras of 2 x 2 matrix-valued first-order differential operators on the complex line. We first completely classify all such superalgebras of finite dimension. Among the finite-dimensional superalgebras whose od[...]texto impreso
We prove that every rational extension of the quantum harmonic oscillator that is exactly solvable by polynomials is monodromy free, and therefore can be obtained by applying a finite number of state-deleting Darboux transformations on the harmo[...]texto impreso
Relaño Pérez, Armando ; Gómez Gómez, José María ; Faleiro, E. ; Muñoz, L. ; Molina, R. A. ; Retamosa Granado, J. | IOP publishing ltd | 2011A survey of chaotic dynamics in atomic nuclei is presented, using on the one hand standard statistics of quantum chaos studies, and on the other a new approach based on time series analysis methods. The study of shell-model spectra in the pf she[...]texto impreso
A versatile and reconfigurable ASIC is presented, which implements two different con-cepts of low level trigger (L0) for Cherenkov telescopes: the Majority trigger (sum of discriminated inputs) and the Sum trigger concept (analogue clipped sum o[...]texto impreso
Weinfurtner, Silke ; De las Cuevas, Gemma ; Martín-Delgado Alcántara, Miguel Ángel ; Briegel, Hans J. | IOP publishing ltd | 2014-03-07We present a new description of discrete space-time in 1+1 dimensions in terms of a set of elementary geometrical units that represent its independent classical degrees of freedom. This is achieved by means of a binary encoding that is ergodic i[...]texto impreso
Roy, C.L. ; Méndez Martín, Bianchi ; Domínguez-Adame Acosta, Francisco | IOP publishing ltd | 1994-05-21A relativistic equation is derived for a slowly varying potential by suitably approximating the one-dimensional Dirac equation. This equation is shown to be akin to the Schrodinger equation with an effective potential and effective eigenvalues. [...]texto impreso
Gómez Gutiérrez, Alicia ; González Herrera, Elvira María ; Vicent López, José Luis ; Cebollada Barata, Federico A. ; Palomares Simón, Francisco Javier ; Sánchez Agudo, Marta ; Urdiroz Urricelqui, Unai | IOP publishing ltd | 2019-02-27With the aim of achieving stable, substantial remanences adequate for exploitation in stray field-based applications, we report on the hysteresis behavior occurring in arrays of single-crystal Fe motifs, a-beam lithographed into prisms with tria[...]texto impreso
We study double-barrier interfaces separating regions of asymptotically subsonic and supersonic flow of Bose condensed atoms. These setups contain at least one black hole sonic horizon from which the analogue of Hawking radiation should be gener[...]texto impreso
Olea Ariza, Javier ; López, E. ; Antolín, E. ; Martí, A. ; Luque, A. ; García Hemme, Eric ; Pastor, D. ; García Hernansanz, Rodrigo ; Prado Millán, Álvaro del ; González Díaz, Germán | IOP publishing ltd | 2016-02-10Silicon samples were implanted with high Ti doses and subsequently processed with the pulsed-laser melting technique. The electronic transport properties in the 15–300?K range and the room temperature spectral photoresponse at energies over the [...]