Finite size analysis of a two-dimensional Ising model within a nonextensive approach (2009)
Crokidakis, N., Soares-Pinto, D. O., Reis, M. S., Souza, A. M., Sarthour, R. S., Oliveira, I. S.
In this work we present a thorough analysis of the phase transitions that occur in a ferromagnetic 2D Ising model, with only nearest-neighbors interactions, in the framework of the Tsallis...
Entanglement temperature in molecular magnets composed of S-spin dimers (2009)
Soares-Pinto, D. O., Souza, A. M., Sarthour, R. S., Oliveira, I. S., Reis, M. S., Brandao, P., ...
In the present work, we investigate the quantum thermal entanglement in molecular magnets composed of dimers of spin $S$, using an Entanglement Witness built from measurements of magnetic...
Magnetocaloric Effect in Manganites: Ferromagnetism and Charge- Ordering Effects (2008)
M. S. Reis, A. M. Gomes, J. P. Araújo, P. B. Tavares, J. S. Amaral, I. S. Oliveira, ...
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Phase diagram of a 2D Ising model within a nonextensive approach (2008)
Soares-Pinto, D. O., Oliveira, I. S., Reis, M. S.
In this work we report Monte Carlo simulations of a 2D Ising model, in which the statistics of the Metropolis algorithm is replaced by the nonextensive one. We compute the magnetization and show that...
Souza, A. M., Reis, M. S., Soares-Pinto, D. O., Oliveira, I. S., Sarthour, R. S.
The present work reports an experimental observation of thermal entanglement in a clusterized spin chain formed in the compound Na$_2$Cu$_5$Si$_4$O$_{14}$. The presence of entanglement was...
On the nonextensive character of some magnetic systems (2007)
Soares-Pinto, D. O., Reis, M. S., Sarthour, R. S., Oliveira, I. S.
During the past few years, nonextensive statistics has been successfully applied to explain many different kinds of systems. Through these studies some interpretations of the entropic parameter q,...
Spin-waves in a complex magnetic system: nonextensive approach (2007)
Soares-Pinto, D. O., Reis, M. S., Sarthour, R. S., Oliveira, I. S.
In this paper we analyze the spin-wave excitations (magnons) of an inhomogeneous spin system within the Boltzmann-Gibbs framework and then connect the results with the nonextensive approach (in the...
New Consideration on Composed Nonextensive Magnetic Systems (2007)
Navarrro, F. A. R., Reis, M. S., Lenzi, E. K, Olivera, I. S.
In this paper a composed A+B magnetic system, with spins J_A=2 and J_B=3/2, is considered within the mean-field approximation, in the framework of Tsallis nonextensive statistics. Our motivation is...
Reis, M. S., Amaral, V. S., Sarthour, R. S., Oliveira, I. S.
In this paper we present a thorough analysis of two systems magnetically inhomogeneous: the manganite La$_{0.7}$Sr$_{0.3}$MnO$_3$/MgO and the amorphous alloy Cu$_{90}$Co$_{10}$. In both cases, the...
Experimental determination of the non-extensive entropic parameter $q$ (2005)
Reis, M. S., Amaral, V. S., Sarthour, R. S., Oliveira, I. S.
We show how to extract the $q$ parameter from experimental data, considering an inhomogeneous magnetic system composed by many Maxwell-Boltzmann homogeneous parts, which after integration over the...
Effects of age and physical activity on the autonomic control of heart rate in healthy men (2005)
Melo,R.C., Santos,M.D.B., Silva,E., Quitério,R.J., Moreno,M.A., Reis,M.S., ...
The effects of the aging process and an active life-style on the autonomic control of heart rate (HR) were investigated in nine young sedentary (YS, 23 ± 2.4 years), 16 young active (YA, 22 ± 2.1...
Influence of charge ordering on the magnetocaloric effect of (Pr,Ca)MnO$_3$ manganites (2003)
Reis, M. S., Amaral, V. S., Araujo, J. P., Tavares, P. B., Gomes, A. M., Oliveira, I. S.
In the present work we analyze the influence of the charge-ordering on the magnetocaloric effect of Pr$_{1-x}$Ca$_x$MnO$_3$ manganites. The results for the samples with $x
Nunes,U.R., Silva,A.A., Reis,M.S., Sediyama,C.S., Sediyama,T.
Este trabalho teve como objetivo avaliar os efeitos do condicionamento osmótico de sementes de soja sobre o desempenho da cultura e sua habilidade competitiva com as plantas daninhas. As sementes de...
Magnetic phase diagram for a non-extensive system: Experimental connection with manganites (2003)
Reis, M. S., Araujo, J. P., Amaral, V. S., Oliveira, I. S.
In the present paper we make a thorough analysis of a classical spin system, within the framework of Tsallis nonextensive statistics. From the analysis of the generalized Gibbs free energy, within...
Reis, M. S., Amaral, V. S., Tavares, P. B., Gomes, A. M., Takeuchi, A. Y., Guimarães, A. P., ...
The low temperature behavior of Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ manganites are known to undergo a transition at $x\sim$0.3, from an insulating ferromagnetic state, at low Ca concentration, to an...
Magnetic behavior of a non-extensive S-spin system: possible connections to manganites (2002)
Reis, M. S., Araujo, J. P., Amaral, V. S., Lenzi, E. K., Oliveira, I. S.
We analyzed the magnetic behavior of a S-spin system within framework of the Tsallis nonextensive statistics, employing the normalized approach. Unusual properties on magnetization, entropy and...
Evidences for Tsallis non-extensivity on CMR manganites (2001)
Reis, M. S., Freitas, J. C. C., Orlando, M. T. D., Lenzi, E. K., Oliveira, I. S.
We found, from the analysis of $M$ vs. $T$ curves of some manganese oxides (manganites), that these systems do not follow the traditional Maxwell-Boltzmann statistics, but the Tsallis statistics,...
Ko, A. I., Martins, E. A. L., Monteiro-Vitorello, C. B., Ho, P. L., Haake, D. A., ...
Leptospira species colonize a significant proportion of rodent populations worldwide and produce life-threatening infections in accidental hosts, including humans. Complete genome sequencing of...
Ko, A. I., Martins, E. A. L., Monteiro-Vitorello, C. B., Ho, P. L., Haake, D. A., ...
Leptospira species colonize a significant proportion of rodent populations worldwide and produce life-threatening infections in accidental hosts, including humans. Complete genome sequencing of...