26 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal do Rio Grande do SulBR14 papers
- Universidade Estadual de Campinas (UNICAMP)BR3 papers
- Institute of PhysicsPL2 papers
- Polish Academy of SciencesPL2 papers
- Universidade Estadual de Santa CruzBR2 papers
- Universidade Estadual Paulista (Unesp)BR2 papers
- Universidade Federal de Santa MariaBR2 papers
- Universidade Federal do ABCBR2 papers
- Universidade Federal do ParanáBR2 papers
- Universidade Federal do Vale do São FranciscoBR2 papers
- Universidade Federal Rural de PernambucoBR2 papers
- Brazilian Network Information CenterBR1 paper
29 papers
Totally Positive Matrices and the Highest-Order Coefficients of the Characteristic Polynomial
Tiago Closs, Leandro Farina
We investigate the extent to which totally positive matrices can be distinguished through the highest-order coefficients of their characteristic polynomials. To identify the most i…
NGC 6860, Mrk 915, and MCG -01-24-012. II. Inflowing and outflowing cold molecular gas and the connection with ionized gas in Seyfert galaxies
Bruno Dall'Agnol de Oliveira, Thaisa Storchi-Bergmann, Neil Nagar +5
We present a study of the cold molecular gas kinematics in the inner ~ 4-7 kpc (projected sizes) of three nearby Seyfert galaxies, with AGN luminosities of ~ 10 erg/s, using…
Analyzing the Effect of an Extreme Weather Event on Telecommunications and Information Technology: Insights from 30 Days of Flooding
Leandro Márcio Bertholdo, Renan Barreto Paredes, Gabriela de Lima Marin +2
In May 2024, weeks of severe rainfall in Rio Grande do Sul, Brazil caused widespread damage to infrastructure, impacting over 400 cities and 2.3 million people. This study presents…
Neuroevolution of Self-Attention Over Proto-Objects
Rafael C. Pinto, Anderson R. Tavares
Proto-objects - image regions that share common visual properties - offer a promising alternative to traditional attention mechanisms based on rectangular-shaped image patches in n…
Photonic entanglement with accelerated light
R. C. Souza Pimenta, G. H. dos Santos, A. B. Barreto +2
Accelerated light has been demonstrated with laser light and diffraction. Within the diffracting field it is possible to identify a portion that carries most of the beam energy, wh…
Metamaterial branes
F. A. P. Alves-Junior, A. B. Barreto, F. Moraes
In this article, we propose metamaterials analog brane models based on the geometric optics approach. We show how to model the Randall-Sundrum thin brane model and the Gremm model…
Understanding Sample Generation Strategies for Learning Heuristic Functions in Classical Planning
R. V. Bettker, P. P. Minini, A. G. Pereira +1
We study the problem of learning good heuristic functions for classical planning tasks with neural networks based on samples represented by states with their cost-to-goal estimates…
Implications of Kleinian relativity
F. A. P. Alves, A. B. Barreto, F. Moraes
Inspired in metamaterials, we present a covariant mechanics for particles in Kleinian spacetime and show some of its effects, such as time contraction and length dilatation. We pre…
Model-Free Episodic Control with State Aggregation
Rafael Pinto
Episodic control provides a highly sample-efficient method for reinforcement learning while enforcing high memory and computational requirements. This work proposes a simple heuris…
Cosmological Solutions for the Geometrical Scalar-Tensor with the Potential Determined by the Noether Symmetry Approach
Adriano B. Barreto, Gilberto M. Kremer
In this work we consider a scale-tensor theory in which the space-time is endowed with a Weyl integrable geometrical structure due to the Palatini variational method. Since the sca…
Solar Flares Forecasting Using Time Series and Extreme Gradient Boosting Ensembles
T. Cinto, A. L. S. Gradvohl, G. P. Coelho +1
Space weather events may cause damage to several fields, including aviation, satellites, oil and gas industries, and electrical systems, leading to economic and commercial losses.…
A Framework for Designing and Evaluating Solar Flare Forecasting Systems
T. Cinto, A. L. S. Gradvohl, G. P. Coelho +1
Disturbances in space weather can negatively affect several fields, including aviation and aerospace, satellites, oil and gas industries, and electrical systems, leading to economi…
Distilling Knowledge from Refinement in Multiple Instance Detection Networks
Luis Felipe Zeni, Claudio Jung
Weakly supervised object detection (WSOD) aims to tackle the object detection problem using only labeled image categories as supervision. A common approach used in WSOD to deal wit…
Energies of Hypergraphs
Kauê Cardoso, Vilmar Trevisan
In this paper, we study energies associated with hypergraphs. More precisely, we obtain results for the incidence and the singless Laplacian energies of uniform hypergraphs. In par…
The Signless Laplacian Matrix of Hypergraphs
Kauê Cardoso, Vilmar Trevisan
In this paper we define signless Laplacian matrix of a hypergraph and obtain structural properties from its eigenvalues. We generalize several known results for graphs, relating th…
Principal eigenvectors of general hypergraphs
Kauê Cardoso, Vilmar Trevisan
In this paper we obtain bounds for the extreme entries of the principal eigenvector of hypergraphs; these bounds are computed using the spectral radius and some classical parameter…
The spectrum of a class of uniform hypergraphs
Kauê Cardoso, Carlos Hoppen, Vilmar Trevisan
A generalized power hypergraph is obtained from a base hypergraph by means of some simple edge-expansion operations. Kang, Liu, Qi and Yuan [8] prov…
Macroscopic-ranged proximity effect in graphite
Bruno Cury Camargo, Piotr Gierlowski, Marek Kuzmiak +4
We report the observation of proximity effect in measurements performed on highly oriented pyrolitic graphite (HOPG) samples when electrical current is injected through the superco…
Weighted EGZ Constant for p-groups of rank 2
Filipe Oliveira, Abílio Lemos, Hemar Godinho
Let be a finite abelian group of exponent , written additively, and let be a subset of . The constant is defined as the smallest integer such…
Neural Networks Models for Analyzing Magic: the Gathering Cards
Felipe Zilio, Marcelo Prates, Luis Lamb
Historically, games of all kinds have often been the subject of study in scientific works of Computer Science, including the field of machine learning. By using machine learning te…
Electrical properties of in-plane-implanted graphite nanoribbons
B. C. Camargo, R. F. de Jesus, B. V. Semenenko +1
We studied the effect of low energy (30 keV) ionic implantation of Ga+ in the direction parallel to the graphene planes (perpendicular to c-axis) in oriented graphite ribbons with…
From quasinormal modes of rotating black strings to hydrodynamics of a moving CFT plasma
Luis A. H. Mamani, Jaqueline Morgan, Alex S. Miranda +1
A certain identification of points in a planar Schwarzschild-anti de Sitter (AdS) black hole generates a four-dimensional static black string. In turn, a rotating black string can…
A nearly cylindrically symmetric source in the Brans-Dicke gravity as the generator of the rotational curves of the galaxies
S. Mittmann dos Santos, J. M. Hoff da Silva, M. E. X. Guimarães +1
Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of kpc to…
Decay Estimates for Solutions of Porous Medium Equations with Advection
Nicolau Matiel Lunardi Diehl, Lucineia Fabris, Juliana Sartori Ziebell
In this paper, we show that bounded weak solutions of the Cauchy problem for general degenerate parabolic equations of the form \begin{equation} \notag u_t \,+\; \mbox{div}\,f(x,t,…