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- M P Almeida, F de Melo, +4 authors L Davidovich
- Science
- 2007

We demonstrate the difference between local, single-particle dynamics and global dynamics of entangled quantum systems coupled to independent environments. Using an all-optical experimental setup, we showed that, even when the environment-induced decay of each system is asymptotic, quantum entanglement may suddenly disappear. This "sudden death" constitutes… (More)

- M P Almeida, P M O Lins, P Charvet-Almeida, R B Barthem
- Brazilian journal of biology = Revista brasleira…
- 2010

The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated. The level of repletion 1 (1/4 full) was the most representative for both sexes, as well as for immature and… (More)

- Francisco S A Cavalcante, Satoru Ito, +7 authors Béla Suki
- Journal of applied physiology
- 2005

Collagen and elastin are thought to dominate the elasticity of the connective tissue including lung parenchyma. The glycosaminoglycans on the proteoglycans may also play a role because osmolarity of interstitial fluid can alter the repulsive forces on the negatively charged glycosaminoglycans, allowing them to collapse or inflate, which can affect the… (More)

- J. S. Andrade, A. M. Alencar, +5 authors B. Suki

We investigate the fluid flow through a cascade of bifurcations by direct simulation of the 2D Navier-Stokes equations. We show that, for a fully symmetric tree with n generations (n $ 3͒, the flow distribution becomes significantly heterogeneous at an increased Reynolds number. We develop a binary tree model and find that the distribution of flow at the… (More)

- Murilo P Almeida, José S Andrade, Hans J Herrmann
- Physical review letters
- 2006

We investigate the airborne transport of particles on a granular surface by the saltation mechanism through numerical simulation of particle motion coupled with turbulent flow. We determine the saturated flux q(s) and show that its behavior is consistent with classical empirical relations obtained from wind tunnel measurements. Our results also allow one to… (More)

- J. S. Andrade, U. M. S. Costa, M. P. Almeida, H. A. Makse, H. E. Stanley
- 1999

We investigate the origin of the deviations from the classical Darcy law by numerical simulation of the Navier-Stokes equations in two-dimensional disordered porous media. We apply the Forchheimer equation as a phenomenological model to correlate the variations of the friction factor for different porosities and flow conditions. At sufficiently high… (More)

We investigate fluid flow through disordered porous media by direct simulation of the Navier-Stokes equations in a two-dimensional percolation structure. We find, in contrast to the log-normal distribution for the local currents found in the analog random resistor network, that over roughly 5 orders of magnitude the distribution n͑E͒ of local kinetic energy… (More)

- R N Costa Filho, M P Almeida, J S Andrade, J E Moreira
- Physical review. E, Statistical physics, plasmas…
- 1999

We perform a statistical analysis on the proportional elections held in Brazil in October 1998. We show that the distribution of votes among candidates for the whole country follows a power law N(v) is proportional to v(-alpha), with alpha=1.00+/-0.02, extending over two orders of magnitude. The voting distributions for several states of the federation also… (More)

- S P Walborn, D S Lemelle, M P Almeida, P H Souto Ribeiro
- Physical review letters
- 2006

We present a proof of principle demonstration of a quantum key distribution scheme in higher-order -dimensional alphabets using spatial degrees of freedom of photons. Our implementation allows for the transmission of 4.56 bits per sifted photon, while providing improved security: an intercept-resend attack on all photons would induce an average error rate… (More)

- Murilo P. Almeida
- Journal of Mathematical Imaging and Vision
- 1997