Zobrazeno 1 - 10
of 33
pro vyhledávání: '"de Almeida, J. R. L."'
Publikováno v:
J. Stat. Mech. (2012) P10007
The ground-state phase diagram of an Ising spin-glass model on a random graph with an arbitrary fraction $w$ of ferromagnetic interactions is analysed in the presence of an external field. Using the replica method, and performing an analysis of stabi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604144
Publikováno v:
Eur. Phys. J. B 47, 245 (2005)
We use the replica method in order to obtain an expression for the variational free energy of an Ising ferromagnet on a Viana-Bray lattice in the presence of random external fields. Introducing a global order parameter, in the replica-symmetric conte
Externí odkaz:
http://arxiv.org/abs/cond-mat/0411682
Autor:
de Almeida, J. R. L., Menche, J.
In this work we present a pedagogical introduction to the minority game and various new versions of it with interesting properties, focusing in its applications in socialphysics. For instance, some systems display a kind of social behavior that seems
Externí odkaz:
http://arxiv.org/abs/cond-mat/0312139
In the investigations of antiferromagnetic (AF)/ ferromagnetic (FM) bilayer samples, often distinct experimental techniques yield different values for the measured exchange anisotropy field (HE). We propose that the observed discrepancy may be accoun
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309535
In the investigations of antiferromagnetic (AF)/ ferromagnetic (FM) bilayer samples, often distinct experimental techniques yield different values for the measured exchange anisotropy field (HE). Using a simple microscopic model for representing the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308346
Autor:
de Almeida, J. R. L., Menche, J.
In this work the properties of minority games containing agents which try to winning all the time are studied by means of computational simulations. We have considered several ways of introducing above the rules clever players using ?strategies? whic
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308249
Autor:
Menche, J., de Almeida, J. R. L.
In this work the properties of multi choice minority games are studied by means of extensive computational simulations. We have considered several ways of rewarding the strategies of the players and compared the resulting behaviours of the ensemble.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308181
Autor:
de Almeida, J. R. L.
The entropy of the Viana-Bray model at zero temperature and external field is calculated within the solution which takes into account only delta functions for the global order parameter P(h). It is shown that such solution is unsatisfactory both from
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208534
In this work a site diluted antiferromagntic Ising model in the FCC lattice is studied by Monte Carlo simulation. At low temperatures, we find that as the external field is increased the transition from the antiferromagnetic phase to the superantifer
Externí odkaz:
http://arxiv.org/abs/cond-mat/0009375
Publikováno v:
Physical Review E 55, 3934 (1997)
The multifractal properties of the Edwards-Anderson order parameter of the short-range Ising spin glass model on d=3 diamond hierarchical lattices is studied via an exact recursion procedure. The profiles of the local order parameter are calculated a
Externí odkaz:
http://arxiv.org/abs/cond-mat/9701009