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Browsing Artigos by Title

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  • Aziz, Mohsin; Felix, Jorlandio F.; Jameel, Dler; Al Saqri, Noor; Al Mashary, Faisal S.; Alghamdi, Haifaa M.; Albalawi, Hind M.A.; Taylor, David; Henini, Mohamed (Superlattices and Microstructures, 2015-12)
    The effect of thermal annealing on Te compensated Interfacial Misfit GaSb/GaAs heterostructures is investigated by using two different thermal annealing procedures, namely rapid thermal annealing and furnace annealing. The ...
  • Ribeiro, I. R. B.; Nascimento, F. S.; Ferreira, S. O.; Moura-Melo, W. A.; Costa, C. A. R.; Borme, J.; Freitas, P. P.; Wysin, G. M.; Araujo, C. I. L. de; Pereira, A. R. (Scientific Reports, 2017-10-25)
    In this work, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical ...
  • Rocha, Marcio S. (Biopolymers, 2009-08-20)
    We review the neighbor exclusion model and some of its applications to analyze the binding data of DNA-ligand complexes. We revisit the closed form of the model developed by McGhee and von Hippel in 1974, showing that this ...
  • Cota, Wesley; Mata, Angélica S.; Ferreira, Silvio C. (Physical Review E, 2018)
    We analyze two alterations of the standard susceptible-infected-susceptible (SIS) dynamics that preserve the central properties of spontaneous healing and infection capacity of a vertex increasing unlimitedly with its ...
  • Mendes, J. B. S; Gamino, M.; Silva, E. F.; Santos, O. Alves; Rodríguez-Suárez, R. L.; Machado, F. L. A.; Azevedo, A.; Rezende, S. M. (Journal of Magnetism and Magnetic Materials, 2018-11-15)
    Enhancements in the spin Hall magnetoresistance (SMR) close to one order of magnitude in bilayers of yttrium iron garnet (YIG) and platinum with embedded metallic nanoparticles of Ag and Cu are reported. The en hancement ...
  • Martins, Marcelo Lobato; Sales, J. A. de; Moreira, J. G. (Journal of Physics A: Mathematical and General, 1999-02-12)
    We propose a method to detect phase transitions in discrete lattice models based on the roughness exponent. This approach is applied to the one-dimensional Domany-Kinzel cellular automaton (CA). Our results, obtained by ...
  • Oliveira, T. J.; Reis, F. D. A. Aarao (Roughness exponents and grain shapes, 2011-04-20)
    In surfaces with grainy features, the local roughness w shows a crossover at a characteristic length rc, with roughness exponent changing from α1≈1 to a smaller α2. The grain shape, the choice of w or height-height correlation ...
  • Leal, F.F.; Ferreira, S.O.; Menezes-Sobrinho, I.L.; Faria, T.E. (Journal of Physics, 2004-12-10)
    Cadmium telluride films were grown on glass substrates using the hot wall epitaxy (HWE) technique. The samples were polycrystalline with a preferential (111) orientation. Scanning electron micrographs reveal a grain size ...
  • Viol, A.; Palhano-Fontes, Fernanda; Onias, Heloisa; Araujo, Draulio B. de; Viswanathan, G. M. (Scientific Reports, 2017-08-07)
    The entropic brain hypothesis holds that the key facts concerning psychedelics are partially explained in terms of increased entropy of the brain’s functional connectivity. Ayahuasca is a psychedelic beverage of Amazonian ...
  • Ferreira, D. L.; Sousa, J. C. L.; Maronesi, R. N.; Bettini, J.; Schiavon, M. A.; Teixeira, A. V. N. C.; Silva, A. G. (The Journal of Chemical Physics, 2017-10-17)
    A new analytical expression for the size-dependent bandgap of colloidal semiconductor nanocrystals is proposed within the framework of the finite-depth square-well effective mass approximation in order to provide a ...
  • Fernandes, R. L.; Lopes., R. J. C; Pereira, A. R (Solid State Communications, 2019-03)
    We have investigated (numerically) skyrmions constituted by two merons in two-dimensional Heisenberg antiferromagnets. The behavior and stability of these topological pseudo-particles are analyzed in discrete and finite ...
  • Pereira, A . R. (Brazilian Journal of Physics, 2002-09)
    We investigate the spectrum of small amplitude oscillations of the sine-Gordon vortex-antivortex pair in layered ferromagnetic systems described by the anisotropic three-dimensional XY-model. In the case of a small interlayer ...
  • Oliveira, Tiago J.; Stilck, Jürgen F. (The Journal of Chemical Physics, 2011-10-14)
    Athermal lattice gases of particles with first neighbor exclusion have been studied for a long time as simple models exhibiting a fluid-solid transition. At low concentration the particles occupy randomly both sublattices, ...
  • Sanchez, Diogo Merguizo; Yokoyama, Tadashi; Brasil, Pedro Ivo de Oliveira; Cordeiro, Ricardo Reis (Mathematical Problems in Engineering, 2009-10-20)
    Through the averaged equations we revisit theoretical and numerical aspects of the strong resonance that increases the eccentricity of the disposed objects of GPS and Galileo Systems. A simple view of the phase space of ...
  • Mendes, J. B. S.; Santos, O. Alves; Meireles, L. M.; Lacerda, R. G.; Vilela-Leão, L. H.; Machado, F. L. A.; Rodríguez-Suárez, R. L.; Azevedo, A.; Rezende, S. M. (Physical Review Letters, 2015-11-25)
    The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, a phenomenon that requires a spin-orbit coupling (SOC). Here we report the ...
  • Miranda, A. M.; Menezes-Sobrinho, I. L.; Couto, M. S. (Physical Review Letters, 2010-04-23)
    We study the behavior of an ink-paper interface in a spontaneous imbibition experiment as a function of time and paper orientation. To characterize the interface roughness the growth β and Hurst H exponents (calculated ...
  • Carvalho-Santos, V. L.; Elias, R. G.; Altbir, D.; Fonseca, J. M. (Journal of Magnetism and Magnetic Materials, 2015-10-01)
    We study the stability and energetics associated to skyrmions appearing as excitations on curved surfaces. Using a continuum model we show that the presence of cylindrically radial and azimuthal fields destabilize the ...
  • Freitas, Kenedy; Toledo, José R.; Figueiredo, Leandro C.; Morais, Paulo C.; Felix, Jorlandio F.; Araujo, Clodoaldo I. L. de (Coatings, 2017-02-15)
    The present study reports on the development of permalloy thin films obtained by electrodeposition onto low-doped n-type silicon substrates. While changing from non-percolated clusters into percolated thin films upon ...
  • Albuquerque, J. E. de; Melo, W. L. B.; Faria, R. M. (Applied Physics A, 2007-07-29)
    In this work, we studied the optical absorption spectral differences between doped and slightly doped polyaniline films and a derivative by photopyroelectric and photoacoustic spectroscopies. There exist great spectral ...
  • Albuquerque, José Eduardo de; Giacomantonio, Clare; White, Andrew G.; Meredith, Paul (European Biophysics Journal, 2005-11-12)
    Photopyroelectric (PPE) spectroscopy, in the 350–1,075 nm wavelength range, was used to study the optical properties of electropolymerized melanin films on indium tin oxide (ITO) coated glass. The PPE intensity signal as ...

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