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American Institute of Physics |
Documentos disponibles de esta editorial (326)
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Presa Muñoz del Toro, Patricia de la ; Rueda, T. ; Hernando Grande, Antonio ; Ramallo López, J. M. ; Giovanetti, L. J. ; Requejo, F. G. | American Institute of Physics | 2008-05-15In this work we present new results on spontaneous oxidation of disordered fcc FePt nanoparticles. The "as-made" oleic acid and oleylamine coated FePt nanoparticles of average size 4 nm synthesized by a high-boiling coordinating solvent method w[...]texto impreso
Moreno, F. ; Álvarez, J. M. ; Amaré, J. C. ; Bernabeu Martínez, Eusebio | American Institute of Physics | 1984The Stark widths of the 5896-Å (3^2 P_1 /2 ? 3^2 S_1 /2) neutral sodium hyperfine lines in the presence of charged perturbers were measured by means of laser saturation spectroscopy. The plasma containing the sodium atoms and the perturbers was [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Hernández Rojas, J.L. ; Lucía Mulas, María Luisa ; Santamaría Sánchez-Barriga, Jacobo ; Sánchez Quesada, Francisco | American Institute of Physics | 1994-03-07Films of CuGaxIn(1-x)Se2 (CGIS) have been grown by rf sputtering from stoichiometric single targets with different Ga/In ratios. Adjusting growth temperature and argon pressure we are able to deposit films with a wide range of Cu contents: From [...]texto impreso
Herrero Gómez, Carlos ; Aragón Sánchez, Ana María ; Hernando Rydings, Manuel ; Marín Palacios, María Pilar | American Institute of Physics | 2014-09-01In this paper, we report an experimental study on the microwave modulated scattering intensity for a single Fe_2.25Co_72.75Si_10B_15 amorphous metallic microwire. The modulation is driven by applying a bias magnetic field that tunes the magnetic[...]texto impreso
Martínez Alonso, Luis ; Medina Reus, Elena ; Mañas Baena, Manuel | American Institute of Physics | 2006-08A scheme for solving Whitham hierarchies satisfying a special class of string equations is presented. The ?-functions of the corresponding solutions is obtained and the differential expressions of the underlying Virasoro constraints are characte[...]texto impreso
Martínez Alonso, Luis ; Medina Reus, Elena ; Mañas Baena, Manuel | American Institute of Physics | 2006-08A scheme for solving Whitham hierarchies satisfying a special class of string equations is presented. The tau-function of the corresponding solutions is obtained and the differential expressions of the underlying Virasoro constraints are charact[...]texto impreso
Dobado González, Antonio ; Delgado López, Rafael ; Llanes Estrada, Felipe José | American Institute of Physics | 2014The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up [...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2007-10-15V_2O_5 nanostructures have been grown on 4H-SiC and Si substrates by a thermal deposition method without a catalyst. High aspect ratio nanowires with rectangular cross sections were grown on 4H-SiC. High-resolution transmission electron microsco[...]texto impreso
Presa Muñoz del Toro, Patricia de la ; Multigner, M. ; Venta,, J. de la ; García, M. A. ; Ruiz González, M. L. | American Institute of Physics | 2006-12-15In this work the study of oleic acid and oleylamine-capped gold nanoparticles is presented. The structural characterization of the sample shows 6.7 nm gold nanoparticles with a narrow size distribution. The experimental optical absorption spectr[...]texto impreso
Calleja, J. F. ; Huttel, Y. ; Contreras, M. C. ; Navarro Palma, Elena ; Presa, B. ; Matarranz, R. ; Cebollada, A. | American Institute of Physics | 2006-09-01A detailed study of the structure and magnetic properties of V/Co versus Co/V bilayers grown on MgO(001) substrates with cubic and hexagonal Co crystal structures is presented. Co is found to adopt fcc structure when grown on MgO(001), while it [...]texto impreso
Maestre Varea, David ; Palais, O. ; Barakel, D. ; Pasquinelli, M. ; Alfonso, B. ; Gourbilleau, F. ; De Laurentis, M. ; Irace, A. | American Institute of Physics | 2010-03-15SiO_2 multilayers with embedded Si nanocrystals (Si-ncs) were investigated as an approach for developing highly efficient all Si tandem solar cells. The nanostructured samples, fabricated by means of a reactive magnetron sputtering, were structu[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 1990-06-01Thin films of CuGaSe2 have been produced by rf sputtering. Compositional, structural, electrical, and optical properties are strongly influenced by growthtemperature. At substrate temperatures lower than 300?°C amorphous or poorly crystalline Se[...]texto impreso
Schlabach, S. ; Szabó, D. V. ; Vollath, D. ; Presa Muñoz del Toro, Patricia de la ; Forker, M. | American Institute of Physics | 2006-07-15Bare and coated TiO? nanoparticles with particle sizes dtexto impreso
Serrano, A. ; Monton, C. ; Valmianski, I. ; Gálvez Alonso, Fernando ; Cortajarena, Aitziber L. ; De la Venta, J. ; Schuller, Ivan K. ; García, M. A. | American Institute of Physics | 2014-03-14We present a Surface Plasmon Resonance spectroscopy study of Co-Phthalocyanine (CoPc) thin films grown on Au layers at different substrate temperatures. We demonstrate that for quantitative analysis, fitting of the resonance angle alone is insuf[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1993-11-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study the upper surface and cross-sectional samples of chemical vapor deposited diamond films. The CL emission is mainly localized at the grain boundaries of the colum[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-03-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study cross-sectional samples on GaN epitaxial films grown on sapphire. Increased CL emission, attributed to the presence of stacking faults and decorated dislocations[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2001-07-15Remote electron beam induced current (REBIC) measurements have been carried out to investigate electrically active regions in Si doped GaN films. REBIC bright-dark contrast has been observed in the border of growth, round or pyramidal, hillocks,[...]texto impreso
Herrera, M. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Stutzmann, M. ; Ambacher, O. | American Institute of Physics | 2004-11Cathodoluminescence (CL) in the scanning electron microscope and atomic force microscopy (AFM) have been used to study the formation of pinholes in tensile and compressively strained AlInGaN films grown on Al2O3 substrates by plasma-induced mole[...]texto impreso
Pal, U. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Serrano, M. D. ; Dieguez, E. | American Institute of Physics | 1994-09-15Cathodoluminescence in the scanning electron microscope has been used to investigate the relationship of point defects in CdTe and CdTe:V with luminescence bands at 1.40 and 1.13 eV. V has been found to inhibit the 1.40 eV luminescence. Annealin[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-08-20The effect of mechanical milling on the structure and luminescent properties of CdSe powder has been investigated by means of cathodoluminescence (CL) in the scanning electron microscope, transmission electron microscopy (TEM) and x-ray diffract[...]texto impreso
González Díaz, Germán ; Artús, L. ; Blanco, N ; Cuscó, R. ; Hernández, S. | American Institute of Physics | 2003-03-01Raman scattering has been used to study the lattice recovery and electrical activation of Si+-implanted In0.53Ga0.47 As achieved by rapid thermal annealing. The degree of crystallinity recovery, of totally amorphized samples is studied for annea[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | American Institute of Physics | 2011-06-01We have analyzed the structural and optical properties of Si implanted with very high Ti doses and subsequently pulsed-laser melted (PLM). After PLM, all samples exhibit an abrupt and roughly uniform, box-shaped Ti profile, with a concentration [...]texto impreso
Garcia March, M. A. ; Jimenez Villacorta, F. ; Quesada, A. ; De la Venta, J. ; Carmona Tejero, Noemi ; Lorite, I. ; LLopis, J. ; Fernandez, J. F. | American Institute of Physics | 2010-01-15We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co_3O_4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic str[...]texto impreso
Most often in chemical physics, long range van der Waals surface interactions are approximated by the exact asymptotic result at vanishing distance, the well known additive approximation of London dispersion forces due to Hamaker. However, the d[...]texto impreso
This review article is concerned with a recently ncovered connection between operator spaces, a noncommutative extension of Banach spaces, and quantum nonlocality, a striking phenomenon which underlies many of the applications of quantum mechani[...]texto impreso
By an application of the geometrical techniques of Lie, Cohen, and Dickson it is shown that a system of differential equations of the form [x^(r_i)]_i = F_i; (where r_i > 1 for every i = 1 , ... ,n) cannot admit an infinite number of pointlike [...]texto impreso
By an application of the geometrical techniques of Lie, Cohen, and Dickson it is shown that a system of differential equations of the form [x^(r_i)]_i = F_i(where r_i > 1 for every i = 1 , ... ,n) cannot admit an infinite number of pointlike sy[...]texto impreso
Gómez-Ullate Otaiza, David ; Lafortune, S. ; Winternitz, P. | American Institute of Physics | 1999-06The Lie point symmetries of a coupled system of two nonlinear differential-difference equations are investigated. It is shown that in special cases the symmetry group can be infinite dimensional, in other cases up to ten dimensional. The equatio[...]texto impreso
We consider the Manin-Radul and Jacobian supersymmetric KP hierarchies from the point of view of the tau-function formalism. Solutions of their associated systems of Sato equations are characterized in terms of correlation functions of supersymm[...]texto impreso
The variation of the electron acoustic signal as a function of temperature in ceramic materials has been studied. Scanning electron acoustic microscopy (SEAM) contrast in MgO single crystals and in reaction bonded SiC, between 100 and 273 K, is [...]texto impreso
Romero, J.J. ; Cuadrado, R. ; Arroyo, A. ; García, M. A. ; Hernando Grande, Antonio ; Cortés Gil, R ; González Calbet, J. M. ; Vallet Regí, V. | American Institute of Physics | 2006-04-15Data are presented on the thermal dependence of the hysteretic properties of cationic vacancies including manganite samples of composition LaMnO_(3+?)(?=0.05 and 0.12). Our results evidence the presence in both samples of two magnetic phases hav[...]texto impreso
Mártil de la Plaza, Ignacio ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2001-08-01Bulk properties of SiNx:H thin film dielectrics and interface characteristics of SiNx:H/Si devices are studied by a combination of electrical measurements (capacitance-voltage and current-voltage characteristics) and defect spectroscopy (electro[...]texto impreso
Ciliberti, S. ; Grigera, T.S. ; Martín Mayor, Víctor ; Parisi, G. ; Verrocchio, P. | American Institute of Physics | 2004-06Despite the presence of topological disorder, phonons seem to exist also in glasses at very high frequencies (THz) and they remarkably persist into the supercooled liquid. A universal feature of such a systems is the Boson peak, an excess of sta[...]texto impreso
The exponential solutions of the Darboux equations for conjugate nets is considered. It is shown that rank-one constraints over the right derivatives of invertible operators on an arbitrary linear space give solutions of the Darboux system, whic[...]texto impreso
Martín Mayor, Víctor ; Mézard, Marc ; Parisi, Giorgio ; Verrocchio, Paolo | American Institute of Physics | 2001-05-08A computation of the dynamical structure factor of topologically disordered systems, where the disorder can be described in terms of Euclidean random matrices, is presented. Among others, structural glasses and supercooled liquids belong to that[...]texto impreso
González Díaz, Germán ; Artús, L. ; Calleja, E. ; Cuscó, R. ; Iborra, E. ; Jiménez, J. ; Pastor, D. ; Peiró, F. | American Institute of Physics | 2006-08-15We have studied the effects of rapid thermal annealing at 1300 degrees C on GaN epilayers grown on AlN buffered Si(111) and on sapphire substrates. After annealing, the epilayers grown on Si display visible alterations with craterlike morphology[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Piqueras de Noriega, Javier | American Institute of Physics | 1995-12-01We have investigated highly doped GaAs:Te at different doping concentrations (> 10(17) cm(-3)) to assess the presence of the EL2 trap. We have utilized both capacitance and current transient spectroscopy techniques. The crucial parameter for the[...]texto impreso
Costa, Romarly F. da ; Varella, Marcio T. do N. ; Bettega, Marcio H. F. ; Neves, Rafael F. C. ; Lopess, María Cristina A. ; Blanco Ramos, Francisco ; García, Gustavo ; Jones, Darryl B. ; Brunger, Michael J. ; Lima, Marco A. P. | American Institute of Physics | 2016-03-28We report on integral-, momentum transfer-and differential cross sections for elastic and electronically inelastic electron collisions with furfural (C5H4O2). The calculations were performed with two different theoretical methodologies, the Schw[...]texto impreso
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Ardenghi, Juan S. ; Castagnino, M. ; Campoamor Stursberg, Otto Ruttwig | American Institute of Physics | 2009The nonrelativistic limit of the centrally extended Poincaré group is considered and their consequences in the modal Hamiltonian interpretation of quantum mechanics are discussed [O. Lombardi and M. Castagnino, Stud. Hist. Philos. Mod. Phys 39, [...]texto impreso
We perform extensive lattice Monte Carlo simulations of protein folding to construct and compare the equilibrium and the kinetic transition state ensembles of a model protein that folds to the native state with two-state kinetics. The kinetic de[...]texto impreso
Fuss, M. C. ; Ellis-Gibbings, L. ; Jones, D. B. ; Brunger, M. J. ; Blanco Ramos, Francisco ; Muñoz, A. ; Limao Vieira, P. ; García, G. | American Institute of Physics | 2015-06-07Water is often used as the medium for characterizing the effects of radiation on living tissue. However, in this study, charged-particle track simulations are employed to quantify the induced physicochemical and potential biological implications[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2008In this work we briefly review the Kovtun-Son-Starinet (KSS) computation of the ratio eta/s for quantum field theories with gravitational dual and the related conjecture that it is bound from below by 1/4 pi. We discuss the validity of the bound[...]texto impreso
García Guinea, Javier ; Sánchez Muñoz, Luis ; Torno, J.L. ; Crespo Feo, Elena ; Ruiz Pérez, Javier ; Martín Herrero, Álvaro Ignacio ; Cremades Rodríguez, Ana Isabel | American Institute of Physics | 2009This paper mainly focuses on the spatial distribution of plagioclase phases observed by Raman and spectra cathodoluminescence (CL) emission of in the Villalbeto de la Peña meteorite. Initially, we collected fragments countryside to determine the[...]texto impreso
We investigate the validity of the weak-Painlevé property as an integrability criterion. We present an example of a time-dependent Hamiltonian system which possesses a weak-Painlevé type expansion, while presenting a chaotic behavior. However, t[...]texto impreso
Barbosa, Alessandra Souza ; Varella, Marcio T. do N. ; Sanchez, Sergio d'A. ; Ameixa, Joao ; Blanco Ramos, Francisco ; García, Gustavo ; Limao Vieira, Paulo ; da Silva, Filipe Ferreira ; Bettega, Marcio H. F. | American Institute of Physics | 2016-08-08In this work, we report theoretical and experimental cross sections for elastic scattering of electrons by chlorobenzene (ClB). The theoretical integral and differential cross sections (DCSs) were obtained with the Schwinger multichannel method [...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Gregorati, Luca | American Institute of Physics | 2008-05-01In-doped SnO_2 microtubes as well as Sn-doped In_2O_3 (ITO) nano- and microislands have been grown by thermal treatment of compacted SnO_2-In_2O powders under argon flow at 1350 degrees C in a catalyst-free process. The SnO_2 tubes contain about[...]texto impreso
Gómez Nicola, Ángel ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics | 2003We report on our recent work about the description of a meson gas below the chiral phase transition within the framework of Chiral Perturbation Theory. As an alternative to the standard treatment, we present a calculation of the quark condensate[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del | American Institute of Physics | 1999-08-15We analyze the effect of thermal processes on the optical properties (refractive index, optical gap, Tauc coefficient, and Urbach energy) of SiNx:H films. Films with three different nitrogen to silicon ratios (x = 0.97, x = 1.43, and x = 1.55, r[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2002-08-15The bonding configuration, hydrogen evolution, and defect content of rapid thermally annealed (RTA) SiOx:H films of different compositions were studied. Infrared absorption measurements showed that all the hydrogen present in the films is lost a[...]