3137599 documents found, page 313760 of 313760
III Conferência Internacional de Políticas Públicas e Ciência de Dados: livro d...
Marques, João; Gomes, Maria Cristina; Borges, Monique; Silva, PatríciaSem resumo disponível.
When do electricity price forecasts create operational value? A regime-aware ev...
Batista, Paulo; Monteiro, Eduardo; Vieira, Margarida; Ferreira, ManuelWhether electricity price forecasts generate operational value in industrial settings — beyond improving predictive accuracy — remains an open question, particularly under extended 168-hour horizons where forecast skill degrades, and tariff-facing decisions must be made against a plausible fixed-tariff baseline. This work evaluated a leakage-safe hybrid model of OMIE gross hourly prices in a backtest of 15 audi...
Entropy functions for semigroup actions
Bis, Andrzej; Carvalho, Maria; Mendes, Miguel; Varandas, PauloWe consider continuous actions of finitely generated semigroups and countable sofic groups, generated either by continuous self-maps or by homeomorphisms of a compact metric space. For each known topological pressure operator associated to these actions, we provide a measure-theoretic entropy map which is concave, upper semicontinuous and satisfies a variational principle whose maximum is always attained. In th...
Physiological description of autism spectrum disorder responses driven by olfac...
Pereira, Lara Isabel FariaAutism Spectrum Disorder (ASD) is frequently associated with abnormal sensory perception, which is one of the factors that contribute to the emergence of cog nitive, behavioral, and social issues, and is one of the earliest indicators of ASD. Multiple studies demonstrate the significance of olfactory stimuli in social and cognitive development, despite the fact that the relationship between ASD and olfaction is...
Guia essencial de publicação académica para investigadores em ciências sociais ...
Ferreira, Helena GonçaloO Guia Essencial de Publicação Académica para Investigadores em Ciências Sociais e Humanidades é um manual prático que acompanha o investigador ao longo de todo o percurso de publicação. O seu objetivo é desmistificar o processo, oferecer ferramentas de aplicação imediata e cultivar uma mentalidade de crescimento que transforme as rejeições em aprendizagem. O guia começa pela escolha da revista, defendendo uma ...
A Stein–Weiss inequality with nonstandard power weights and applications
Almeida, Alexandre; Cruz-Uribe, David; Rafeiro, HumbertoIn this paper, we prove a generalization of the Stein–Weiss inequality for the fractional integral operator in variable Lebesgue spaces with nonstandard power weights of the form $w(x) = |x|^{\gamma(x)}$. As applications, we prove Hardy–Sobolev and related inequalities with these weights.
Estimating data complexity and drift through a multiscale generalized impurity ...
Costa, Diogo; Rocha, Eugénio M.; Ferreira, NelsonThe quality of machine learning solutions, and of classifier models in general, depend largely on the performance of the chosen algorithm, and on the intrinsic characteristics of the input data. Although work has been extensive on the former of these aspects, the latter has received comparably less attention. In this paper, we introduce the Multiscale Impurity Complexity Analysis (MICA) algorithm for the quanti...
Sobre a direcção de polifonia vocal da Renascença
Negreiros, VascoSem resumo disponível.
Quaternion Hyperbolic Transforms of the Fourier Type: an overview
Ferreira, M.; Morais, J.Quaternion Hyperbolic Transforms of the Fourier type associated with quaternion-valued signals defined over an open rectangle of the Euclidean plane endowed with a hyperbolic measure include the Fourier, Wigner-Ville, and linear canonical transforms. In this paper, we give a descriptive review of these generalized transforms and provide some of their important properties. The different forms of the hyperbolic k...