77 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal do ParáBR20 papers
- Instituto Federal do ParanáBR5 papers
- Universidade Federal do ParanáBR5 papers
- Universidade Federal FluminenseBR5 papers
- Altamira TechnologiesUS3 papers
- Universidade Federal da ParaíbaBR3 papers
- Universidade Federal de Campina GrandeBR3 papers
- Universidade Federal do Rio de JaneiroBR3 papers
- Universidade Tecnológica Federal do ParanáBR3 papers
- Umeå UniversitySE2 papers
- Universidade Estadual de Campinas (UNICAMP)BR2 papers
- Universidade Federal do Sul e Sudeste do ParáBR2 papers
35 papers
Corruption as a self-sustained collective state in political systems
Nuno Crokidakis, Jaime L. C. da C. Filho
Political corruption is often interpreted as the result of individual misconduct or isolated institutional failures. However, persistent corruption patterns observed in real-world…
Opinion dynamics under electoral shocks in competitive campaigns
Jaime L. C. da C. Filho, Nuno Crokidakis
We propose a computational framework for modeling opinion dynamics in electoral competitions that combines two realistic features: voter memory and exogenous shocks. The population…
Propositional Abduction via Only-Knowing: A Non-Monotonic Approach
Sanderson Molick, Vaishak Belle
The paper introduces a basic logic of knowledge and abduction by extending Levesque logic of only-knowing with an abduction modal operator defined via the combination of basic epis…
Sufficient conditions for unbounded superradiance in black hole spacetimes sourced by nonlinear electrodynamics
Marco A. A. de Paula, Luiz C. S. Leite, Luís C. B. Crispino
Recently, it has been reported that black holes (BHs) sourced by nonlinear electrodynamics (NED) can trigger unbounded superradiance, i. e., the total absorption cross section -- t…
The time-dependent quantum harmonic oscillator: a pedagogical approach via the Lewis-Riesenfeld dynamical invariant method
Stanley S. Coelho, Lucas Queiroz, Danilo T. Alves
In quantum mechanics courses, students often solve the Schrödinger equation for the harmonic oscillator with time-independent parameters. However, time-dependent quantum harmonic o…
Interseções entre a Física e os saberes da tradição ceramista
Samuel Antonio Silva do Rosario, Carlos Aldemir Farias da Silva
The growing interaction between traditional knowledge and formal sciences emerges as a relevant field of research. In this perspective, the aim of this article is to investigate th…
Superradiant instability of a charged regular black hole
Sam R. Dolan, Marco A. A. de Paula, Luiz C. S. Leite +1
We show that a charged, massive scalar field in the vicinity of an electrically-charged Ayón-Beato-García (ABG) regular black hole has a spectrum of quasibound states that (in a ce…
Scattering by stringy black holes
Sérgio V. M. C. B. Xavier, Carolina L. Benone, Luiz C. S. Leite +1
We study the scattering of axially incident massless scalar waves by a charged and rotating black hole solution from heterotic string theory called the Kerr-Sen black hole. We comp…
Leveraging Model Fusion for Improved License Plate Recognition
Rayson Laroca, Luiz A. Zanlorensi, Valter Estevam +2
License Plate Recognition (LPR) plays a critical role in various applications, such as toll collection, parking management, and traffic law enforcement. Although LPR has witnessed…
Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in non-collinear magnetic dimers
Ramon Cardias, Jhonatan dos Santos Silva, Anders Bergman +7
A spin Hamiltonian, which characterizes interatomic interactions between spin moments, is highly valuable in predicting and comprehending the magnetic properties of materials. A de…
Corrigendum to "On the monophonic rank of a graph" [Discrete Math. Theor. Comput. Sci. 24:2 (2022) #3]
Mitre C. Dourado, Vitor S. Ponciano, Rômulo L. O. da Silva
In this corrigendum, we give a counterexample to Theorem 5.2 in "On the monophonic rank of a graph" [Discrete Math. Theor. Comput. Sci. 24:2 (2022) #3]. We also present a polynomia…
Parametrized black holes: Scattering investigation
Renan B. Magalhães, Luiz C. S. Leite, Luís C. B. Crispino
We study the scattering of light-like geodesics and massless scalar waves by a static Konoplya-Zhidenko black hole, considering the case that the parametrized black hole solution c…
Explanations Based on Item Response Theory (eXirt): A Model-Specific Method to Explain Tree-Ensemble Model in Trust Perspective
José Ribeiro, Lucas Cardoso, Raíssa Silva +3
In recent years, XAI researchers have been formalizing proposals and developing new methods to explain black box models, with no general consensus in the community on which method…
Global Semantic Descriptors for Zero-Shot Action Recognition
Valter Estevam, Rayson Laroca, Helio Pedrini +1
The success of Zero-shot Action Recognition (ZSAR) methods is intrinsically related to the nature of semantic side information used to transfer knowledge, although this aspect has…
Squeezed coherent states for a free particle with time-varying mass
A. S. Pereira, A. S. Lemos, F. A. Brito
We obtain the squeezed coherent states (SCS) for a free particle with exponentially time-varying mass. We write these states in terms of the squeeze and displacement parameters on…
Scattering properties of charged black holes in nonlinear and Maxwell's electrodynamics
Marco A. A. de Paula, Luiz C. S. Leite, Luís C. B. Crispino
We investigate the scattering properties of a massless scalar field in the background of a charged Ayón-Beato-García regular black hole solution. Using a numerical approach, we com…
Generalized para-Bose states
A. S. Pereira, A. S. Lemos, F. A. Brito
In this paper, we construct integrals of motion in a para-Bose formulation for a general time-dependent quadratic Hamiltonian, which, in its turn, commutes with the reflection oper…
On the Cross-dataset Generalization in License Plate Recognition
Rayson Laroca, Everton V. Cardoso, Diego R. Lucio +2
Automatic License Plate Recognition (ALPR) systems have shown remarkable performance on license plates (LPs) from multiple regions due to advances in deep learning and the increasi…
Scattering by deformed black holes
Renan B. Magalhães, Luiz C. S. Leite, Luís C. B. Crispino
Obtaining black hole solutions in alternative theories of gravity can be a difficult task due to cumbersome field equations that arise in many of such theories. In order to study t…
Tell me what you see: A zero-shot action recognition method based on natural language descriptions
Valter Estevam, Rayson Laroca, David Menotti +1
This paper presents a novel approach to Zero-Shot Action Recognition. Recent works have explored the detection and classification of objects to obtain semantic information from vid…
Localization transition induced by programmable disorder
Jaime L. C. da C. Filho, Zoe Gonzalez Izquierdo, Andreia Saguia +3
We investigate the occurrence of many-body localization (MBL) on a spin-1/2 transverse-field Ising model defined on a Chimera connectivity graph with random exchange interactions a…
Time-dependent coherent squeezed states in a nonunitary approach
A. S. Pereira, A. S. Lemos
In this work, we have applied the integrals of motion method in a nonunitary approach and so obtained the time-dependent displacement and squeezed parameters of the coherent squeez…
Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption
Marco A. A. Paula, Luiz C. S. Leite, Luís C. B. Crispino
Along the last decades, several regular black hole (BH) solutions, i.e., singularity-free BHs, have been proposed and associated to nonlinear electrodynamics models minimally coupl…
On the monophonic rank of a graph
Mitre C. Dourado, Vitor S. Ponciano, Rômulo L. O. da Silva
A set of vertices of a graph is if every induced path joining two vertices of is contained in . The of , $\…