35 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT26 papers
- University of AveiroPT11 papers
- Centre National de la Recherche ScientifiqueFR7 papers
- Centro de MatemáticaPT6 papers
- INESC TECPT6 papers
- Instituto de Física de Materiais Avançados, Nanotecnologia e FotónicaPT6 papers
- University of CoimbraPT5 papers
- University of LisbonPT5 papers
- University of MinhoPT4 papers
- Institute of Mathematical SciencesIN3 papers
- Laboratoire des Matériaux et du Génie PhysiqueFR3 papers
- Universidad Autónoma de MadridES3 papers
53 papers
On a measure-theoretic reading of -Grüss-type inequalities
K. Castillo, Â. Macedo
On its absolute-integrability domain, the positive -integral is integration with respect to a finite positive purely atomic measure. After normalisation, its Chebyshev functiona…
On the ellipticity of the higher rank numerical range
Natália Bebiano, Rute Lemos, Graça Soares
The higher rank numerical range is a concept that generalizes the classical numerical range, and it has application in quantum error correction. We investigate these sets for -b…
Classification of grapevine varieties using UAV hyperspectral imaging
Alfonso López, Carlos Javier Ogayar, Francisco Ramón Feito +1
The classification of different grapevine varieties is a relevant phenotyping task in Precision Viticulture since it enables estimating the growth of vineyard rows dedicated to dif…
Lossless preprocessing of floating point data to enhance compression
Francesco Taurone, Daniel E. Lucani, Marcell Fehér +1
Data compression algorithms typically rely on identifying repeated sequences of symbols from the original data to provide a compact representation of the same information, while ma…
MedShapeNet -- A Large-Scale Dataset of 3D Medical Shapes for Computer Vision
Jianning Li, Zongwei Zhou, Jiancheng Yang +154
Prior to the deep learning era, shape was commonly used to describe the objects. Nowadays, state-of-the-art (SOTA) algorithms in medical imaging are predominantly diverging from co…
Lost work and exergy: two views of the same concept
Joaquim Anacleto
We present the fundamental equation for a system and for a process, and by considering irreversibility within the system, we show that the lost work concept emerges naturally from…
Challenges and Trends in User Trust Discourse in AI
Sonia Sousa, Jose Cravino, Paulo Martins
The Internet revolution in 1990, followed by the data-driven and information revolution, has transformed the world as we know it. Nowadays, what seam to be 10 to 20 years ago, a sc…
Human-centered trust framework: An HCI perspective
Sonia Sousa, Jose Cravino, Paulo Martins +1
The rationale of this work is based on the current user trust discourse of Artificial Intelligence (AI). We aim to produce novel HCI approaches that use trust as a facilitator for…
Narasimhan--Ramanan branes and wobbly Higgs bundles
Emilio Franco, Peter B. Gothen, André G. Oliveira +1
Narasimhan--Ramanan branes were introduced by the authors in a previous article. They consist of a family of -branes inside the moduli space of Higgs bundles, and a family of…
Thermal capacities and polytropic processes
Joaquim Anacleto
Herein, we analyse polytropic processes for an ideal gas within the wider concept of thermal capacity. To answer the question of whether the thermal capacity is a process, path, or…
A generalised distributed-order Maxwell model
Luis Ferrás, Maria Luisa Morgado, Magda Rebelo
In this work we present a generalised viscoelastic model using distributed-order derivatives. The model consists of two distributed-order elements (distributed springpots) connecte…
Heat and lost work in irreversible cycles: the two sides of the same coin
Joaquim Anacleto
We discussed the criterion for usefully comparing an irreversible cycle with a reversible one, and show that the lost work cannot be determined by the usual cycle diagrams, contrar…
Subtractive mountain clustering algorithm applied to a chatbot to assist elderly people in medication intake
Neuza Clar, Paulo A. Salgado, T-P Azevedo Perdicoúlis
Errors in medication intake among elderly people are very common. One of the main causes for this is their loss of ability to retain information. The high amount of medicine intake…
Examples of surfaces with canonical map of degree 4
Carlos Rito
We give two examples of surfaces with canonical map of degree 4 onto a canonical surface.
Lie algebroid connections, twisted Higgs bundles and motives of moduli spaces
David Alfaya, André Oliveira
Let be an algebraic Lie algebroid over a smooth projective curve of genus such that is a line bundle whose degree is less than…
Principal bundles on 2-dimensional CW-complexes with disconnected structure group
André Oliveira
Given any topological group , the topological classification of principal -bundles over a finite CW-complex is long-known to be given by the set of free homotopy classes…
A New Mathematical Model for the Efficiency Calculation
Anibal Galindro, Micael Santos, Delfim F. M. Torres +1
During the past sixty years, a lot of effort has been made regarding the productive efficiency. Such endeavours provided an extensive bibliography on this subject, culminating in t…
Crossover in the pressure evolution of elementary distortions in RFeO3 perovskites and its impact on their phase transition
R. Vilarinho, P. Bouvier, M. Guennou +9
This work reports on the pressure dependence of the octahedra tilts and mean Fe-O bond lengths in RFeO3 (R=Nd, Sm, Eu, Gd, Tb and Dy), determined through synchrotron X-ray diffract…
Variational and Optimal Control Approaches for the Second-Order Herglotz Problem on Spheres
L. Machado, L. Abrunheiro, N. Martins
The present paper extends the classical second-order variational problem of Herglotz type to the more general context of the Euclidean sphere S^n following variational and optimal…
Modeling transient currents in time-of-flight experiments with tempered time-fractional diffusion equations
Maria Luísa Morgado, Luís Filipe Morgado
In this work we use tempered fractional advection-diffusion equations to model the dispersive transport in disordered materials. A numerical method is derived to approximate the so…
A Mathematical Model for Vineyard Replacement with Nonlinear Binary Control Optimization
Anibal Galindro, Adelaide Cerveira, Delfim F. M. Torres +2
Vineyard replacement is a common practice in every wine-growing farm since the grapevine production decays over time and requires a new vine to ensure the business sustainability.…
SO(p,q)-Higgs bundles and higher Teichmüller components
Marta Aparicio-Arroyo, Steven Bradlow, Brian Collier +3
Some connected components of a moduli space are mundane in the sense that they are distinguished only by obvious topological invariants or have no special characteristics. Others a…
A simple mathematical model for unemployment: a case study in Portugal with optimal control
Anibal Galindro, Delfim F. M. Torres
We propose a simple mathematical model for unemployment. Despite its simpleness, we claim that the model is more realistic and useful than recent models available in the literature…
On Basic Fourier-Bessel Expansions
José Luis Cardoso
When dealing with Fourier expansions using the third Jackson (also known as Hahn-Exton) -Bessel function, the corresponding positive zeros and the "shifted" zeros, $qj_…