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Dive into the research topics where Jafferson Kamphorst Leal da Silva is active.

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Featured researches published by Jafferson Kamphorst Leal da Silva.


The Journal of Experimental Biology | 2004

On the scaling of mammalian long bones

Guilherme J. M. Garcia; Jafferson Kamphorst Leal da Silva

SUMMARY Although there is much data available on mammalian long-bone allometry, a theory explaining these data is still lacking. We show that bending and axial compression are the relevant loading modes and elucidate why the elastic similarity model failed to explain the experimental data. Our analysis provides scaling relations connecting bone diameter and length to the axial and transverse components of the force, in good agreement with experimental data. The model also accounts for other important features of long-bone allometry.


Physical Review E | 1998

Moment ratios for absorbing-state phase transitions

Ronald Dickman; Jafferson Kamphorst Leal da Silva

We determine the first through fourth moments of the order parameter, and various ratios, for several one- and two-dimensional models with absorbing-state phase transitions. We perform a detailed analysis of the system-size dependence of these ratios and confirm that they are indeed universal for three models, the contact process, the


Brazilian Journal of Physics | 2006

Scaling properties of the Fermi-Ulam accelerator model

Jafferson Kamphorst Leal da Silva; Denis Gouvêa Ladeira; Edson D. Leonel; Peter V. E. McClintock; Sylvie Oliffson Kamphorst

A


Physical Review E | 2016

Stochastic win-stay-lose-shift strategy with dynamic aspirations in evolutionary social dilemmas.

Marco Antonio Amaral; Jafferson Kamphorst Leal da Silva; Matjaz Perc; Lucas Wardil

model, and the pair contact process, belonging to the directed percolation universality class. Our studies also yield a refined estimate for the critical point of the pair contact process.


Physical Review E | 2016

Evolutionary mixed games in structured populations: Cooperation and the benefits of heterogeneity.

Marco Antonio Amaral; Lucas Wardil; Matjaz Perc; Jafferson Kamphorst Leal da Silva

The chaotic low energy region (chaotic sea) of the Fermi-Ulam accelerator model is discussed within a scaling framework near the integrable to non-integrable transition. Scaling results for the average quantities (velocity, roughness, energy etc.) of the simplified version of the model are reviewed and it is shown that, for small oscillation amplitude of the moving wall, they can be described by scaling functions with the same characteristic exponents. New numerical results for the complete model are presented. The chaotic sea is also characterized by its Lyapunov exponents.


Journal of Physics A | 2007

Scaling properties of a simplified bouncer model and of Chirikov's standard map

Denis Gouvêa Ladeira; Jafferson Kamphorst Leal da Silva

In times of plenty expectations rise, just as in times of crisis they fall. This can be mathematically described as a win-stay-lose-shift strategy with dynamic aspiration levels, where individuals aspire to be as wealthy as their average neighbor. Here we investigate this model in the realm of evolutionary social dilemmas on the square lattice and scale-free networks. By using the master equation and Monte Carlo simulations, we find that cooperators coexist with defectors in the whole phase diagram, even at high temptations to defect. We study the microscopic mechanism that is responsible for the striking persistence of cooperative behavior and find that cooperation spreads through second-order neighbors, rather than by means of network reciprocity that dominates in imitation-based models. For the square lattice the master equation can be solved analytically in the large temperature limit of the Fermi function, while for other cases the resulting differential equations must be solved numerically. Either way, we find good qualitative agreement with the Monte Carlo simulation results. Our analysis also reveals that the evolutionary outcomes are to a large degree independent of the network topology, including the number of neighbors that are considered for payoff determination on lattices, which further corroborates the local character of the microscopic dynamics. Unlike large-scale spatial patterns that typically emerge due to network reciprocity, here local checkerboard-like patterns remain virtually unaffected by differences in the macroscopic properties of the interaction network.


Journal of Physics A | 2008

Scaling features of a breathing circular billiard

Denis Gouvêa Ladeira; Jafferson Kamphorst Leal da Silva

Evolutionary games on networks traditionally involve the same game at each interaction. Here we depart from this assumption by considering mixed games, where the game played at each interaction is drawn uniformly at random from a set of two different games. While in well-mixed populations the random mixture of the two games is always equivalent to the average single game, in structured populations this is not always the case. We show that the outcome is, in fact, strongly dependent on the distance of separation of the two games in the parameter space. Effectively, this distance introduces payoff heterogeneity, and the average game is returned only if the heterogeneity is small. For higher levels of heterogeneity the distance to the average game grows, which often involves the promotion of cooperation. The presented results support preceding research that highlights the favorable role of heterogeneity regardless of its origin, and they also emphasize the importance of the population structure in amplifying facilitators of cooperation.


Journal of Physics A | 2007

Unified Theory of Interspecific Allometric Scaling

Jafferson Kamphorst Leal da Silva; Lauro A. Barbosa; Paulo Roberto Silva

Scaling properties of Chirikovs standard map are investigated by studying the average value of I2, where I is the action variable, for initial conditions in (a) the stability island and (b) the chaotic component. Scaling behavior appears in three regimes, defined by the value of the control parameter K: (i) the integrable to non-integrable transition (K ≈ 0) and K < Kc (Kc ≈ 0.9716); (ii) the transition from limited to unlimited growth of I2, K Kc; (iii) the regime of strong nonlinearity, K Kc. Our scaling results are also applicable to Pustylnikovs bouncer model, since it is globally equivalent to the standard map. We also describe the scaling properties of a stochastic version of the standard map, which exhibits unlimited growth of I2 even for small values of K.


Journal of Physics A | 2011

The evolution of cooperation in heterogeneous networks when opponents can be distinguished

Lucas Wardil; Jafferson Kamphorst Leal da Silva

We investigate the chaotic lowest energy region of the simplified breathing circular billiard, a two-dimensional generalization of the Fermi model. When the oscillation amplitude of the breathing boundary is small and we are near the integrable to non-integrable transition, we obtain numerically that average quantities can be described by scaling functions. We also show that the map that describes this model is locally equivalent to Chirikovs standard map in the region of the phase space near the first invariant spanning curve.


Brazilian Journal of Physics | 2009

Non-universal interspecific allometric scaling of metabolism

Jafferson Kamphorst Leal da Silva; Lauro A. Barbosa

A general simple theory for the interspecific allometric scaling is developed in the d + 1-dimensional space (d biological lengths and a physiological time) of metabolic states of organisms. It is assumed that natural selection shaped the metabolic states in such a way that the mass and energy d + 1-densities are size-invariant quantities (independent of body mass). The different metabolic states (basal and maximum) are described by considering that the biological lengths and the physiological time are related by different transport processes of energy and mass. In the basal metabolism, transportation occurs by ballistic and diffusion processes. In d = 3, the 3/4 law occurs if the ballistic movement is the dominant process, while the 2/3 law appears when both transport processes are equivalent. Accelerated movement during the biological time is related to the maximum aerobic sustained metabolism, which is characterized by the scaling exponent 2d/(2d + 1) (6/7 in d = 3). The results are in good agreement with empirical data and a verifiable empirical prediction about the aorta blood velocity in maximum metabolic rate conditions is made.

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Dive into the Jafferson Kamphorst Leal da Silva's collaboration.

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Lucas Wardil

University of British Columbia

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Denis Gouvêa Ladeira

Universidade Federal de Minas Gerais

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Lauro A. Barbosa

Universidade Federal de Minas Gerais

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Marco Antonio Amaral

Universidade Federal de Minas Gerais

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Paulo Roberto Silva

Universidade Federal de Minas Gerais

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Sylvie Oliffson Kamphorst

Universidade Federal de Minas Gerais

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Elton J. da Silva Júnior

Universidade Federal de Minas Gerais

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