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 ...
Bacterial attachment to stainless steels AISI (American Iron and Steel Institute) 304 and 316, the preferred material choices for food equipment, is a very important food safety consideration. The purpose of the present ...
Felix, J. F.; Cunha, D. L. da; Pereira, G. F. C.; Aguiar, J. Albino; Azevedo, W. M. de(Materials Research Bulletin, 2014-01)
This article presents a chemical bottom-up synthesis of highly crystalline and nanostructured hydrocerussite (Pb3(CO3)2(OH)2) with hexagonal morphology prepared by laser ablation in liquid. The results demonstrate that is ...
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 ...
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 ...
Brandao, Mariana P.; Gouvea Neto, Marina; Anjos, Virgílio de Carvalho dos; Bell, Maria José V.(Food Control, 2017-06-07)
The increasing importance of goat milk renews the need to examine the authenticity of goat milk powder and to identify frauds with cow milk powder. The use of front-face and time-resolved fluorescence techniques to identify ...
Moura-Melo, W. A.; Pereira, A. R.; Mól, L. A. S.; Pires, A. S. T.(Physics Letters A, 2007-01-01)
We study magnetic vortex-like excitations lying on a conic space background. Two types of them are obtained. Their energies appear to be linearly dependent on the conical aperture parameter, besides of being logarithmically ...
Belo, L. R. A.; Oliveira Neto, N. M.; Moura Melo, W. A.; Pereira, A. R.; Ercolessi, Elisa(Physics Letters A, 2007-06-11)
Heisenberg-like spins lying on the pseudosphere (a 2-dimensional infinite space with constant negative curvature) cannot give rise to stable soliton solutions. Only fractional solutions can be stabilized on this surface ...
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 ...
Velásquez, R.; Pankiewicz, C. G.(Superlattices and Microstructures, 2008-03-19)
The effects of the field-induced conduction band anisotropy on the electron effective mass and electrical transport properties of coupled double quantum well structures are discussed. This anisotropy is due to the formation ...
Pereira, A. R.; Ercolessi, E.; Pires, A. S. T.(Solid State Communications, 2008-01)
In this letter we extend the nonlinear σ model describing pure spin ladders with an arbitrary number of legs to the case of ladders containing a single static hole. A simple immediate application of this approach to classical ...
Franco, Daniel H. T.(Mathematical Physics, Analysis and Geometry, 2014-05-07)
Recently, Hořava (Phys. Rev. D. 79, 084008, 2009) proposed a theory of gravity in 3+1 dimensions with anisotropic scaling using the traditional framework of quantum field theory (QFT). Such an anisotropic theory of gravity, ...
Fonseca, Jakson M.; Vilas-Boas, Priscila S. C.; Elias, Ricardo G.; Altbir, Dora; Carvalho-Santos, Vagson L.(Physics Letters A, 2015-01-02)
We study the influence of curvature on the exchange energy of skyrmions and vortices on a paraboloidal surface. It is shown that such structures appear as excitations of the Heisenberg model, presenting topological stability, ...
Felix, Jorlandio F.; Cunha, Diego L. da; Aziz, Mohsin; Silva Jr., Eronides F. da; Taylor, David; Henini, Mohamed; Azevedo, Walter M. de(Radiation Measurements, 2014-05-29)
Polyaniline thin films have been deposited by a very simple technique on p-type Silicon Carbide (SiC) substrates to fabricate heterojunctions devices with good electrical properties. In this work two heterojunctions devices ...
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 ...
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 ...
Silva, S. L.; Ferreira, J. A.; Martins, M. L.(Physica A: Statistical Mechanics and its Applications, 2007-04-15)
The susceptible-infected-susceptible (SIS) epidemics in a scale-free network in which each node is a square lattice itself is
investigated through large-scale computer simulations. The model combines a local contact process ...
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 ...
Franco, D. H. T.; Cima, O. M. Del; Piguet, O.; Schweda, M.(Physics Letters B, 2009-09-14)
In this Letter we call into question the perturbatively parity breakdown at 1-loop for the massless QED3 frequently claimed in the literature. As long as perturbative quantum field theory is concerned, whether a parity ...
Albuquerque, J. E. de; Balogh, D. T.; Faria, R. M.(Applied Physics A, 2007-03)
In this study, we carried out a quantitative depth profile analysis of the optical properties of slightly and strongly doped polyaniline (PANI) films, using both photoacoustic and photopyroelectric spectroscopies. As the ...