149 documents found, page 1 of 15
Memórias do movimento Metanoia no Marão
Balsa, CarlosNão imaginei, quando fui convidado para presidir ao INSCOOP que viria a ser extinto dando lugar à CASES, que me iria confrontar com uma realidade tão densa de história e povoada de protagonistas tão revelantes no pensamento e estimáveis na ação. São largos anos coabitando com esse caudal de ensinamentos aos quais não sei como guardar fidelidade, senão prosseguindo na ação que nos deixaram como herança. Vou some...
A GPU implementation of the analog ensemble method
Crico, Ruben; Charles, Ines; Balsa, Carlos; Rufino, JoséThe Analog Ensemble (AnEn) method can be used to reconstruct incomplete time series using correlated series. Since the AnEn method may use data including several variables through long periods of time, its storage and computational cost may be substantial, slowing down reconstructions. This paper presents a full GPU implementation of the AnEn method, based on PyCUDA, that leads to a significant a cceleration of...
A educação popular em Portugal
Amorim, José Pedro; Felgueiras, Margarida Louro; Balsa, Carlos; Gonçalves, Pedro; Mazza, Mariana; Souza, StherO conceito de «educação popular» tem várias interpretações, quer do ponto de vista temporal quer geográfico-social. Importa, pois, esclarecer do que falamos, no caso português, quando usamos este conceito. O período em análise refere-se aos últimos 75 anos – este texto foi suscitado como contributo para a celebração do 75.º aniversário da Organização de Estados Ibero-Americanos (OEI). Em Portugal, como é consab...
Exploring Controlled Passive Particle Motion Driven by Point Vortices on a Sphere
Balsa, Carlos; Otero-Espinar, M. Victoria; Gama, Sílvio M.A.This work focuses on optimizing the displacement of a passive particle interacting with vortices located on the surface of a sphere. The goal is to minimize the energy expended during the displacement within a fixed time. The modeling of particle dynamics, whether in Cartesian or spherical coordinates, gives rise to alternative formulations of the identical problem. Thanks to these two versions of the same prob...
Recursos Hídricos e Geológicos de Trás-os-Montes
Aguiar, José (Ed.); Rodrigues, Orlando (Ed.); Balsa, CarlosSeis anos volvidos sobre a publicação do livro Recursos Geológicos de Trás- -os-Montes – Passado, presente e perspetivas futuras o Instituto Politécnico de Bragança (IPB) publica agora o livro Recursos Hídricos e Geológicos de Trás-os-Montes. Com este novo livro sobre a mesma temática o IPB pretende completar a divulgação dos principais recursos hídricos e geológicos da região trans- montana, dando agora maior ...
Parametric study of a stochastic SEIR model for a COVID-19 post-pandemic scenario
Balsa, Carlos; Padua, Everaldo Junior Borges Garcia de; Pinto, Luan Crisostomo; Rufino, JoséDespite the end of the COVID-19 pandemic was decreed by the WHO, this disease has not disappeared and continues to claim victims. Thus, it remains important to follow up, monitor, and project its evolution in the short term. To that end, mathematical models are a precious tool. Based on its results, it is possible to take preventive measures that minimize the spread of this contagious disease. This study focuse...
Optimal Latent Variables Number for the Reconstruction of Time Series with PLSR
Balsa, Carlos; Dupuis, Hugo; Breve, Murilo Montanini; Guivarch, Ronan; Rufino, JoséThe Partial Least Squares Regression is an efficient method for the filling of gaps in meteorological time series. It enables to reduce the dimension of the predictor dataset to a reduced number of latent variables, without loss of significant information. Defining the number of latent variables to be used is an essential aspect of the success of the method. This study is about the comparison between eight diff...
A simple mathematical model to steering oceanic debris to a targeted region
Balsa, Carlos; Otero-Espinar, M. Victoria; Gama, Sílvio M.A.In this article, a simplified mathematical model is presented to depict the process of collecting ocean debris. The responsible autonomous vehicles for transporting the trash are represented as passive particles, while the ocean current is simulated by the movement of point vortices on a sphere. To ensure the autonomy of the vehicles, a system of piecewise constant controls is employed, using a limited number o...
Computational simulation of the COVID-19 epidemic with the SEIR stochastic model
Balsa, Carlos; Lopes, Isabel Maria; Guarda, Teresa; Rufino, JoséA small number of individuals infected within a community can lead to the rapid spread of the disease throughout that community, leading to an epidemic outbreak. This is even more true for highly contagious diseases such as COVID-19, known to be caused by the new coronavirus SARS-CoV-2. Mathematical models of epidemics allow estimating several impacts on the population and, therefore, are of great use for the d...
Reconstruction of meteorological records by methods based on dimension reductio...
Balsa, Carlos; Breve, Murilo Montanini; Rodrigues, Carlos Veiga; Rufino, JoséThe reconstruction or prediction of meteorological records through the Analog Ensemble (AnEn) method is very efficient when the number of predictor time series is small. Thus, in order to take advantage of the richness and diversity of information contained in a large number of predictors, it is necessary to reduce their dimensions. This study presents methods to accomplish such reduction, allowing the use of a...