Centro de Matemática

output

20012022

most citedAutomated polyp detection in colon capsule endoscopy

306 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2017Show all

27 papers · 1 filter

physics.flu-dyn2017★ 2 cited

Eddy diffusivity of quasi-neutrally-buoyant inertial particles

Marco Martins Afonso, Paolo Muratore-Ginanneschi, Sílvio M. A. Gama +1

We investigate the large-scale transport properties of quasi-neutrally-buoyant inertial particles carried by incompressible zero-mean periodic or steady ergodic flows. We show how…

math.DS2017★ 6 cited

The Lifting Bifurcation Problem on Feed-Forward Networks

Pedro Soares

We consider feed-forward networks, that is, networks where cells can be divided into layers, such that every edge targeting a layer, excluding the first one, starts in the prior la…

physics.flu-dyn2017★ 2 cited

Settling velocity of quasi-neutrally-buoyant inertial particles

Marco Martins Afonso, Sílvio Marques de Almeida Gama

We investigate the sedimentation properties of quasi-neutrally buoyant inertial particles carried by incompressible zero-mean fluid flows. We obtain generic formulae for the termin…

math.DG2017★ 4 cited

Almost formality of quasi-Sasakian and Vaisman manifolds with applications to nilmanifolds

Beniamino Cappelletti-Montano, Antonio De Nicola, Juan Carlos Marrero +1

We provide models that are as close as possible to being formal for a large class of compact manifolds that admit a transversely Kaehler structure, including Vaisman and quasi-Sasa…

math.DS2017

Stability of a heteroclinic network and its cycles: a case study from Boussinesq convection

Olga Podvigina, Sofia B. S. D. Castro, Isabel S. Labouriau

This article is concerned with three heteroclinic cycles forming a heteroclinic network in $R^{6}$ . The stability of the cycles and of the network are studied. The cycles a…

math.GR2017

On the insertion of n-powers

J. Almeida, O. Klíma

In algebraic terms, the insertion of $n$ -powers in words may be modelled at the language level by considering the pseudovariety of ordered monoids defined by the inequality $1\le x…

math.AP2017

Uniformly compressing mean curvature flow

Wenhui Shi, Dmitry Vorotnikov

Michor and Mumford showed that the mean curvature flow is a gradient flow on a Riemannian structure with a degenerate geodesic distance. It is also known to destroy the uniform den…

math.CT2017★ 7 cited

Pseudoalgebras and non-canonical isomorphisms

Fernando Lucatelli Nunes

Given a pseudomonad $T$ , we prove that a lax $T$ -morphism between pseudoalgebras is a $T$ -pseudomorphism if and only if there is a suitable (possib…

math.AG2017★ 2 cited

Quiver Bundles and Wall Crossing for Chains

P. B. Gothen, A. Nozad

Holomorphic chains on a Riemann surface arise naturally as fixed points of the natural C*-action on the moduli space of Higgs bundles. In this paper we associate a new quiver bundl…

math.RA2017★ 5 cited

$k$ -Modules over linear spaces by $n$ -linear maps admitting a multiplicative basis

Elisabete Barreiro, Ivan Kaygorodov, José M. Sánchez

We study the structure of certain $k$ -modules $V$ over linear spaces $W$ with restrictions neither on the dimensions of $V$ and $W$ nor on the b…

math.GR2017★ 2 cited

Nilpotency and strong nilpotency for finite semigroups

J. Almeida, M. Kufleitner, M. H. Shahzamanian

Nilpotent semigroups in the sense of Mal'cev are defined by semigroup identities. Finite nilpotent semigroups constitute a pseudovariety, $MN$ , which has finite rank. The…

physics.flu-dyn2017★ 6 cited

From the simple reacting sphere kinetic model to the reaction-diffusion system of Maxwell-Stefan type

Benjamin Anwasia, Patrícia Gonçalves, Ana Jacinta Soares

In this paper we perform a formal asymptotic analysis on a kinetic model for reactive mixtures in order to derive a reaction-diffusion system of Maxwell-Stefan type. More specifica…

cs.DM2017★ 2 cited

Physically Feasible Decomposition of Engino $^{®}$ Toy Models: A Graph Theoretic Approach

Efstathios N. Antoniou, Adérito Araújo, Miguel D. Bustamante +1

During the 125th European Study Group with Industry held in Limassol, Cyprus, 5-9 December 2016, one of the participating companies, Engino.net Ltd, posed a very interesting challe…

math.AG2017★ 21 cited

Topological mirror symmetry for parabolic Higgs bundles

Peter B. Gothen, André G. Oliveira

We prove the topological mirror symmetry conjecture of Hausel-Thaddeus for the moduli space of strongly parabolic Higgs bundles of rank two or three, with full flags. Although the…

math.DS2017★ 7 cited

Complete set of invariants for a Bykov attractor

Maria Carvalho, Alexandre A. P. Rodrigues

In this paper we consider an attracting heteroclinic cycle made by a 1-dimensional and a 2-dimensional separatrices between two hyperbolic saddles having complex eigenvalues. The b…

math.CA2017★ 17 cited

The spectral expansion approach to index transforms and connections with the theory of diffusion processes

Rúben Sousa, Semyon Yakubovich

Many important index transforms can be constructed via the spectral theory of Sturm-Liouville differential operators. Using the spectral expansion method, we investigate the genera…

math.CA2017★ 1 cited

On zeros of polynomials in best $L^{p}$ -approximation and inserting mass points

K. Castillo, M. S. Costa, F. R. Rafaeli

The purpose of this note is to revive in $L^{p}$ spaces the original A. Markov ideas to study monotonicity of zeros of orthogonal polynomials. This allows us to prove and improve in…

math.DS2017★ 2 cited

Networks with asymmetric inputs: lattice of synchrony subspaces

Manuela A. D. Aguiar

We consider coupled cell networks with asymmetric inputs and study their lattice of synchrony subspaces. For the particular case of 1-input regular coupled cell networks we describ…

math.DG2017★ 23 cited

Orbispaces as differentiable stratified spaces

Marius Crainic, João Nuno Mestre

We present some features of the smooth structure, and of the canonical stratification on the orbit space of a proper Lie groupoid. One of the main features is that of Morita invari…

gr-qc2017★ 5 cited

Conformal geodesics in spherically symmetric vacuum spacetimes with Cosmological constant

Alfonso García-Parrado Gómez-Lobo, Edgar Gasperin, Juan A. Valiente Kroon

An analysis of conformal geodesics in the Schwarzschild-de Sitter and Schwarzschild-anti de Sitter families of spacetimes is given. For both families of spacetimes we show that ini…

math.AG2017★ 9 cited

A pair of rigid surfaces with $p_{g} = q = 2$ and $K^{2} = 8$ whose universal cover is not the bidisk

Francesco Polizzi, Carlos Rito, Xavier Roulleau

We construct two complex-conjugated rigid surfaces with $p_{g} = q = 2$ and $K^{2} = 8$ whose universal cover is not biholomorphic to the bidisk. We show that these are the unique surfaces w…

math.DS2017

Projections of Patterns and Mode Interactions

Sofia B. S. D. Castro, Isabel S. Labouriau, Juliane F. Oliveira

We study solutions of bifurcation problems with periodic boundary conditions, with periods in an $n + 1$ -dimensional lattice and their projection into $n$ -dimensional space through i…

math.AT2017

Labeled homology of higher-dimensional automata

Thomas Kahl

We construct labeling homomorphisms on the cubical homology of higher-dimensional automata and show that they are natural with respect to cubical dimaps and compatible with the ten…