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- Frederic Bartumeus, J. R. Martínez Catalán, Umberto L Fulco, Marcelo L. Lyra, G. M. Viswanathan
- Physical review letters
- 2002

An important application involving two-species reaction-diffusion systems relates to the problem of finding the best statistical strategy for optimizing the encounter rate between organisms. We investigate the general problem of how the encounter rate depends on whether organisms move in Lévy or Brownian random walks. By simulating a limiting generalized… (More)

- F. W. S. Lima, Umberto L Fulco, Raimundo N Costa Filho
- Physical review. E, Statistical, nonlinear, and…
- 2005

The stationary critical properties of the isotropic majority vote model on random lattices with quenched connectivity disorder are calculated by using Monte Carlo simulations and finite size analysis. The critical exponents gamma and beta are found to be different from those of the Ising and majority vote on the square lattice model and the critical noise… (More)

- Umberto L Fulco, Djalmir N Messias, Marcelo L. Lyra
- Physical review. E, Statistical, nonlinear, and…
- 2001

We investigate the critical behavior of a one-dimensional diffusive epidemic propagation process by means of a Monte Carlo procedure. In the model, healthy (A) and sick (B) individuals diffuse on a lattice with diffusion constants D(A) and D(B), respectively. According to a Wilson renormalization calculation, the system presents a second-order phase… (More)

- José X Lima Neto, Umberto L Fulco, +5 authors V. N. Freire
- Physical chemistry chemical physics : PCCP
- 2015

We employ quantum biochemistry methods based on the Density Functional Theory (DFT) approach to unveil the detailed binding energy features of willardiines co-crystallized with the AMPA receptor. Our computational results demonstrate that the total binding energies of fluorine-willardiine (FW), hydrogen-willardiine (HW), bromine-willardiine (BrW) and… (More)

- Maurizio Serva, Umberto L Fulco, E. L. Albuquerque
- Physical review. E, Statistical, nonlinear, and…
- 2013

We investigate the critical properties of Ising models on a regularized Apollonian network (RAN), here defined as a kind of Apollonian network in which the connectivity asymmetry associated with its corners is removed. Different choices for the coupling constants between nearest neighbors are considered and two different order parameters are used to detect… (More)

- Luiziana Ferreira da Silva, Umberto L Fulco, Fernando D. Nobre
- Journal of physics. Condensed matter : an…
- 2009

The site-diluted Ising ferromagnet is investigated on a square lattice, within short-time-dynamics numerical simulations, for different site concentrations. The dynamical exponents θ and z are obtained and it is shown that these exponents do depend strongly on the disorder, exhibiting a clear breakdown of universality, characterized by relative variations… (More)

- Stefane N Costa, V. N. Freire, +4 authors Eudenílson L. Albuquerque
- The journal of physical chemistry. A
- 2016

The role of hydration on the structural, electronic, optical, and vibrational properties of monohydrated (CaCO3·H2O, hexagonal, P31, Z = 9) and hexahydrated (CaCO3·6H2O, monoclinic, C2/c, Z = 4) calcite crystals is assessed with the help of published experimental and theoretical data applying density functional theory within the generalized gradient… (More)

- Amélia Maria Marinho de Morais e Silva, Stefane N Costa, +6 authors E. W. S. Caetano
- The journal of physical chemistry. A
- 2015

The infrared absorption and Raman scattering spectra of the monoclinic P21 l-aspartic acid anhydrous crystal were recorded and interpreted with the help of density functional theory (DFT) calculations. The effect of dispersive forces was taken into account, and the optimized unit cells allowed us to obtain the vibrational normal modes. The computed data… (More)

- Nilma Da Costa, Umberto L Fulco, Marcelo L. Lyra, Iram Gleria
- Physical review. E, Statistical, nonlinear, and…
- 2007

We investigate the critical behavior of a model with two coupled critical densities, one of which is diffusive. The model simulates the propagation of an epidemic process in a population, which uses the underlying lattice to leave a track of the recent disease history. We determine the critical density of the population above which the system reaches an… (More)

In this work, we study the critical behavior of an epidemic propagation model that considers individuals that can develop drug resistance. In our lattice model, each site can be found in one of four states: empty, healthy, normally infected (not drug resistant) and strain infected (drug resistant) states. The most relevant parameters in our model are… (More)