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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.[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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 | 2012-10The 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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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.[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 | 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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]