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Browsing Artigos by Issue Date

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  • 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 ...
  • Stariolo, Daniel A.; Arenzon, Jeferson J. (Physical Review E., 1999-05-01)
    We study by means of Monte Carlo simulations the off-equilibrium properties of a model glass, the frustrated Ising lattice gas in three dimensions. We have computed typical two times quantities, such as density-density ...
  • Redinz, José Arnaldo (Physical Review E, 1999-09-01)
    We use an exact recursion procedure to verify analytically, without any intermediary numerical calculation, the validity of the hyperscaling (Josephson) law extended to fractals, the Rushbrooke and Griffiths scaling laws ...
  • Martins, M. L.; Ceotto, G.; Alves, S. G.; Bufon, C. C. B.; Silva, J. M.; Laranjeira, F. F. (Physical Review E., 2000-06-14)
    A cellular automata model is proposed to analyze the progress of citrus variegated chlorosis epidemics in São Paulo orange plantations. In this model epidemiological and environmental features, such as motility of sharpshooter ...
  • Menezes-Sobrinho, I. L.; Bernardes, A. T.; Moreira, J. G. (Physical Review E, 2001-01-26)
    In this paper, we introduce a model for fracture in fibrous materials that takes into account the rupture height of the fibers, in contrast with previous models. Thus, we obtain the profile of the fracture and calculate ...
  • Menezes-Sobrinho, I. L. (Physical Review E, 2001-12-14)
    In the present paper, a fiber bundle model in (1+1) dimensions that simulates the rupture process of a fibrous material pulled by an uniaxial force F is analyzed. In this model the load of a broken fiber is shifted in equal ...
  • 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 ...
  • Ferreira Jr., S. C. (Physical Review E, 2004-09-29)
    In this work, the contact process (CP) is modified in order to model a contact replication process (CRP) for monoclonal reproduction. The occupation rates of an empty site depend on the nearest-neighbor and next- ...
  • 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 ...
  • Freitas, Walter A.; Moura-Melo, Winder A.; Pereira, A. R. (Physics Letters A, 2005-03-14)
    This work is devoted to the study of how spin texture excitations are affected by the presence of a static non-magnetic impurity whenever they lie on a conical support. We realize a number of novelties as compared to the ...
  • Silva, Ricardo L.; Guimaraes, Paulo R. C.; Pereira, Afranio R. (Solid State Communications, 2005-05)
    We study static vacancies on a ferromagnetic spin-1/2 chain described by the transverse Ising model with second neighbor interactions at zero temperature. Using exact diagonalization techniques and applying a finite-size ...
  • Mansur Filho, J. C.; Silva, A. G.; Carvalho, A. T. G.; Martins, M. L. (Physica A: Statistical Mechanics and its Applications, 2005-05-25)
    We report some experimental results for quasi-two-dimensional electrocrystallization of copper under magnetic fields. Such results are theoretically investigated by large scale simulations of a DLA-like model in which ...
  • Menezes-Sobrinho, I. L.; Couto, M. S.; Ribeiro, I. R. B. (Physical Review E, 2005-06-22)
    We have experimentally investigated the fracture process in paper samples submitted to a uniaxial force. Five types of paper sheets (newsprint, towel, sulfite, silk, and couche papers) were fractured along two orthogonal ...
  • 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 ...
  • Pereira, Denis Rafael de Oliveira; Aguiar, Oderli (Revista Ponto de Vista, 2006-01)
    O ensino fundamental e médio no Brasil, como se sabe, é de baixa qualidade em muitas regiões. Muitos fatores concorrem para esse resultado. O desinteresse dos alunos em relação às aulas e as dificuldades que muitos professores ...
  • Velásquez, Rober (Superlattices and Microstructures, 2006-02-17)
    In this work we describe a magnetotunneling spectroscopy technique for probing the localization degree of two-dimensional states and mapping the subbands in the active region of a resonant-tunneling semiconductor ...
  • Otomar, D. R.; Menezes-Sobrinho, I. L.; Couto, M. S. (Physical Review Letters, 2006-03-07)
    In this work, we present an experimental investigation of the fuse model. Our main goal was to study the influence of the disorder on the fracture process. The experimental apparatus used consisted of an L×L square lattice ...
  • Martins, M.L. (Ecological Modelling, 2006-03-15)
    General solutions for a model proposed by An et al. [An, M., Liu, D.L., Johnson, I.R., Lovett, J.V., 2003. Mathematical modelling of allelopathy. II. The dynamics of allelochemicals from living plants in the environment. ...
  • Oliveira-Neto, N. M.; Souza, J. de; Ribeiro-Silva, C. I. (The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics, 2006-06-30)
    We propose a method, based on a generalized Heisenberg algebra (GHA), to reproduce the anharmonic spectrum of diatomic molecules. The theoretical spectrum generated by GHA allows us to fit the experimental data and to ...
  • Teixeira, A. V.; Geissler, E.; Licinio, P. (The Journal of Physical Chemistry B, 2006-09-22)
    We present dynamic light scattering (DLS) measurements of soft poly(methyl-methacrylate) (PMMA) and polyacrylamide (PA) polymer gels prepared with trapped bodies (latex spheres or magnetic nanoparticles). We show that the ...

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