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19982026
most citedCOVID-19 identification in chest X-ray images on flat and hierarchical classification scenarios

534 citations

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26 papers · 1 filter

cond-mat.stat-mech2025★ 1 cited

A unified framework for divergences, free energies, and Fokker-Planck equations

Anna L. F. Lucchi, Jean H. Y. Passos, Max Jauregui +1

Many efforts have been made to explore systems that show significant deviations from predictions related to the standard statistical mechanics. The present work introduces a unifie…

cond-mat.stat-mech2024★ 7 cited

Chaotic behavior in Lotka-Volterra and May-Leonard models of biodiversity

D. Bazeia, M. Bongestab, B. F. de Oliveira

Quantification of chaos is a challenging issue in complex dynamical systems. In this paper, we discuss the chaotic properties of generalized Lotka-Volterra and May-Leonard models o…

cond-mat.stat-mech2023★ 16 cited

Interplay between particle trapping and heterogeneity in anomalous diffusion

Haroldo V. Ribeiro, Angel A. Tateishi, Ervin K. Lenzi +2

Heterogeneous media diffusion is often described using position-dependent diffusion coefficients and estimated indirectly through mean squared displacement in experiments. This app…

cond-mat.stat-mech2022★ 29 cited

Transient anomalous diffusion in heterogeneous media with stochastic resetting

M. K. Lenzi, E. K. Lenzi, L. M. S. Guilherme +2

We investigate a diffusion process in heterogeneous media where particles stochastically reset to their initial positions at a constant rate. The heterogeneous media is modeled usi…

cond-mat.stat-mech2021★ 13 cited

Stationary solution and theorem for a generalized Fokker-Planck equation

Max Jauregui, Anna L. F. Lucchi, Jean H. Y. Passos +1

We investigate a family of generalized Fokker-Planck equations that contains Richardson and porous media equations as members. Considering a confining drift term that is related to…

cond-mat.stat-mech2021★ 2 cited

High-field specific heat and entropy obtained from adiabatic temperature change

L. S. Paixão, E. O. Usuda, W. Imamura +1

Specific heat and entropy are relevant thermodynamic properties, which may be used as macroscopic probes to microscopic properties of materials under ambient conditions and under h…

cond-mat.stat-mech2020★ 27 cited

Quenched and Annealed Disorder Mechanisms in Comb-Models with Fractional Operators

A. A. Tateishi, H. V. Ribeiro, T. Sandev +2

Recent experimental findings on anomalous diffusion have demanded novel models that combine annealed (temporal) and quenched (spatial or static) disorder mechanisms. The comb-model…

cond-mat.stat-mech2017★ 180 cited

The role of fractional time-derivative operators on anomalous diffusion

Angel A. Tateishi, Haroldo V. Ribeiro, Ervin K. Lenzi

The generalized diffusion equations with fractional order derivatives have shown be quite efficient to describe the diffusion in complex systems, with the advantage of producing ex…

cond-mat.stat-mech2011★ 2 cited

Anomalous diffusion in a symbolic model

H. V. Ribeiro, E. K. Lenzi, R. S. Mendes +1

We address this work to investigate some statistical properties of symbolic sequences generated by a numerical procedure in which the symbols are repeated following a power law pro…

cond-mat.stat-mech2010★ 24 cited

Integro-differential diffusion equation for continuous time random walk

Kwok Sau Fa, K. G. Wang

In this paper we present an integro-differential diffusion equation for continuous time random walk that is valid for a generic waiting time probability density function. Using thi…

cond-mat.stat-mech2005★ 26 cited

Logarithmic diffusion and porous media equations: a unified description

I. T. Pedron, R. S. Mendes, T. J. Buratta +2

In this work we present the logarithmic diffusion equation as a limit case when the index that characterizes a nonlinear Fokker-Planck equation, in its diffusive term, goes to zero…

cond-mat.stat-mech2004★ 11 cited

Micellar shape anisotropy and elastic constants in discotic lyotropic liquid crystals

P. A. de Castro, A. J. Palangana, L. R. Evangelista

The elastic constants of a discotic lyotropic nematic liquid crystal are calculated by means of a pseudo-molecular approach as functions of the micellar shape anisotropy. By assumi…

cond-mat.stat-mech2003★ 88 cited

q-exponential, Weibull, and q-Weibull distributions: an empirical analysis

S. Picoli, R. S. Mendes, L. C. Malacarne

In a comparative study, the q-exponential and Weibull distributions are employed to investigate frequency distributions of basketball baskets, cyclone victims, brand-name drugs by…

cond-mat.stat-mech2002★ 62 cited

Anomalous diffusion, nonlinear fractional Fokker-Planck equation and solutions

E. K. Lenzi, L. C. Malacarne, R. S. Mendes +1

We obtain new exact classes of solutions for the nonlinear fractional Fokker-Planck-like equation partial_t rho = partial_x{D(x) partial^{mu -1}_x rho^{nu} - F(x) rho} by consideri…

cond-mat.stat-mech2002★ 45 cited

N-dimensional nonlinear Fokker-Planck equation with time-dependent coefficients

L. C. Malacarne, R. S. Mendes, I. T. Pedron +1

An -dimensional nonlinear Fokker-Planck equation is investigated here by considering the time dependence of the coefficients, where drift-controlled and source terms are present…

cond-mat.stat-mech2002★ 42 cited

Nonlinear anomalous diffusion equation and fractal dimension: Exact generalized gaussian solution

I. T. Pedron, R. S. Mendes, L. C. Malacarne +1

In this work we incorporate, in a unified way, two anomalous behaviors, the power law and stretched exponential ones, by considering the radial dependence of the -dimensional no…

cond-mat.stat-mech2002★ 28 cited

Average Entropy of a Subsystem from its Average Tsallis Entropy

L. C. Malacarne, R. S. Mendes, E. K. Lenzi

In the nonextensive Tsallis scenario, Page's conjecture for the average entropy of a subsystem[Phys. Rev. Lett. {\bf 71}, 1291(1993)] as well as its demonstration are generalized,…

cond-mat.stat-mech2001★ 73 cited

q-Exponential Distribution in Urban Agglomeration

L. C. Malacarne, R. S. Mendes, E. K. Lenzi

Usually, the study of city population distribution has been reduced to power laws. In such analysis, a common practice is to consider cities with more than one hundred thousand inh…

cond-mat.stat-mech2000★ 95 cited

Nonlinear equation for anomalous diffusion: unified power-law and stretched exponential exact solution

L. C. Malacarne, R. S. Mendes, I. T. Pedron +1

The nonlinear diffusion equation is analyzed here, where $\tildeΔ\equiv \frac{1}{r^{d-1}}\frac{\partial}{\partial r} r^{d-1-θ} \frac{\…

cond-mat.stat-mech2000

Comment on "Anomalous Spreading of Power-Law Quantum Wave Packets"

R. S. Mendes, C. Anteneodo

A family of wave packets with power law tails are employed to analyze the long time dependence of the corresponding probability density. The densities, associated to packets for fr…

cond-mat.stat-mech2000★ 28 cited

Renormalization group approach to nonextensive statistical mechanics

Renio S. Mendes, Constantino Tsallis

We analyze a simple classical Hamiltonian system within the hypothesis of renormalizability and isotropy that essentially led Maxwell to his ubiquitous Gaussian distribution of vel…

cond-mat.stat-mech2000★ 45 cited

Regularities in football goal distributions

L. C. Malacarne, R. S. Mendes

Besides of complexities concerning to football championships, it is identified some regularities in them. These regularities refer to goal distributions by goal-players and by game…

cond-mat.stat-mech1999★ 11 cited

Path Integral Approach to the Nonextensive Canonical Density Matrix

E. K. Lenzi, L. C. Malacarne, R. S. Mendes

Feynman's path integral is herein generalized to the nonextensive canonical density matrix based on Tsallis entropy. This generalization is done in two ways by using unnormalized a…

cond-mat.stat-mech1999★ 2 cited

Nonlinear differential equations based on nonextensive Tsallis entropy and physical applications

R. S. Mendes, I. T. Pedron

A family of nonlinear ordinary differential equations with arbitrary order is obtained by using nonextensive concepts related to the Tsallis entropy. Applications of these equation…