R L Viana
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Explore the profile of R L Viana including associated specialties, affiliations and a list of published articles.
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50
Citations
126
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Recent Articles
1.
Souza L, Egydio de Carvalho R, Viana R, Caldas I
Chaos
. 2024 Dec;
34(12).
PMID: 39636066
The Labyrinthic map is a two-dimensional area-preserving map that features a robust transport barrier known as the shearless curve. In this study, we explore a dissipative version of this map,...
2.
Mugnaine M, Caldas I, Szezech J, Viana R, Morrison P
Phys Rev E
. 2024 Nov;
110(4-1):044201.
PMID: 39562920
For several decades now it has been known that systems with shearless invariant tori, nontwist Hamiltonian systems, possess barriers to chaotic transport. These barriers are resilient to breakage under perturbation...
3.
Leal B, Caldas I, de Sousa M, Viana R, Ozorio de Almeida A
Phys Rev E
. 2024 Feb;
109(1-1):014230.
PMID: 38366434
Recent evidence shows that heteroclinic bifurcations in magnetic islands may be caused by the amplitude variation of resonant magnetic perturbations in tokamaks. To investigate the onset of these bifurcations, we...
4.
Souza L, Sales M, Mugnaine M, Szezech J, Caldas I, Viana R
Phys Rev E
. 2024 Feb;
109(1-2):015202.
PMID: 38366399
We investigate chaotic impurity transport in toroidal fusion plasmas (tokamaks) from the point of view of passive advection of charged particles due to E×B drift motion. We use realistic tokamak...
5.
Souza L, Mathias A, Caldas I, Elskens Y, Viana R
Chaos
. 2023 Dec;
33(8).
PMID: 38060771
The E×B drift motion of particles in tokamaks provides valuable information on the turbulence-driven anomalous transport. One of the characteristic features of the drift motion dynamics is the presence of...
6.
Simile Baroni R, Egydio de Carvalho R, Caldas I, Viana R, Morrison P
Phys Rev E
. 2023 Mar;
107(2-1):024216.
PMID: 36932624
We consider a dissipative version of the standard nontwist map. Nontwist systems present a robust transport barrier, called the shearless curve, that becomes the shearless attractor when dissipation is introduced....
7.
Gomes J, de Sousa M, Viana R, Caldas I, Elskens Y
Chaos
. 2021 Sep;
31(8):083104.
PMID: 34470246
We analyze nonlinear aspects of the self-consistent wave-particle interaction using Hamiltonian dynamics in the single wave model, where the wave is modified due to the particle dynamics. This interaction plays...
8.
Silva I, Schelin A, Viana R, Caldas I
Chaos
. 2020 Oct;
30(9):093135.
PMID: 33003941
We study the advection of blood particles in the carotid bifurcation, a site that is prone to plaque development. Previously, it has been shown that chaotic advection can take place...
9.
Budzinski R, Boaretto B, Prado T, Viana R, Lopes S
Chaos
. 2020 Jan;
29(12):123132.
PMID: 31893641
The connection architecture plays an important role in the synchronization of networks, where the presence of local and nonlocal connection structures are found in many systems, such as the neural...
10.
Mathias A, Mugnaine M, Santos M, Szezech J, Caldas I, Viana R
Phys Rev E
. 2019 Dec;
100(5-1):052207.
PMID: 31869942
Fractal structures are very common in the phase space of nonlinear dynamical systems, both dissipative and conservative, and can be related to the final state uncertainty with respect to small...