25 documents found, page 1 of 3
Quantifying In Vivo Arterial Deformation from CT and MRI: a Systematic Review o...
Valente, Rodrigo; Henriques, Bernardo; Mourato, André; Xavier, José; Brito, Moisés; Avril, Stéphane; Tomás, António; Fragata, JoséThis article presents a systematic review on methods for quantifying three-dimensional, time-resolved (3D+t) deformation and motion of human arteries from Computed Tomography (CT) and Magnetic Resonance Imaging (MRI). Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we searched Scopus, Web of Science, IEEE Xplore, Google Scholar, and PubMed on 19 December 2025 fo...
Clinical prediction and spatial statistical analysis of ascending thoracic aort...
Rodriguez, Katalina; Carvalho, Alda; Valente, Rodrigo; Xavier, José; Tomás, AntónioThis study presents an analysis of data from patients with ascending thoracic aortic aneurysms (ATAAs). Two databases of 87 patients were available: one containing clinical variables and the other consisting of measurements of the maximum diameter taken along the ascending aorta. For the clinical database, both a supervised and an unsupervised learning method were applied to explore patterns within the data. On...
Analysis of thoracic aortic aneurysm CTA scans using spatial statistics
Rodriguez, Katalina; Carvalho, Alda; Valente, Rodrigo; Xavier, José; Tomás, AntónioThis study leverages spatial statistics to analyze the spatial distribution of the aorta, aiming to better understand the biomechanical behavior of Ascending Thoracic Aortic Aneurysms (ATAA) and its impact on clinical outcomes. CTA angiography was performed on 87 ATAA patients. Experimental variograms were computed for various variables, such as maximum diameter, from which key parameters of interest were extra...
Identification of apple fruit-skin constitutive laws by full-field methods usin...
Campos, Teresa Daniela Azevedo; Araújo, Rafael; Xavier, José; QUYEN, NGUYEN-TRONG; Dourado, N.; Morais, José; Pereira, FábioThe protective and preservative role of apple skin in maintaining the integrity of the fruit is well-known, with its mechanical behaviour playing a pivotal role in determining fruit storage capacity. This study employs a combination of experimental and numerical methodologies, specifically utilising the digital image correlation (DIC) technique. A specially devised inverse strategy is applied to evaluate the me...
Experimental evaluation of cohesive laws components of mixed-mode I + II fractu...
Pereira, Fábio; Morais, José; Xavier, José; Dourado, N.; de Moura, M.F.S.F.Mixed-mode I + II fracture characterization of cortical bone tissue is addressed in this work. The mixed-mode bending test was used to impose different mode ratios. An equivalent crack length data reduction method was considered to obtain the strain energy release rate components. Crack opening and shear displacements were measured by means of digital image correlation. These quantities were then integrated to ...
I Mini-Olimpíadas Experimentais de Ciência.
Oliveira, Filipa; Carvalho, Maria Paula; Novais, Anabela; Mendes, Cristiana; Abrantes, I.; Gama, Ricardo; Abreu, Maria Conceição; Aibéo, AlexandreAs Olimpíadas de Ciência têm o potencial de divulgar a ciência e motivar os alunos para a mesma, estimular a construção do conhecimento científico e promover o desenvolvimento de novas metodologias em contexto escolar de 1.º Ciclo do Ensino Básico (CEB), bem como identificar indicadores relevantes na Educação em Ciências (Oliveira, & Paixão, 2018). Neste sentido, foi concebido um estudo piloto para implementar,...
A importância das I Miniolimpíadas Experimentais de Ciência na formação científ...
Oliveira, Filipa; Carvalho, Maria Paula; Novais, Anabela; Mendes, Cristiana; Abrantes, I.; Gama, Ricardo; Abreu, Maria Conceição; Aibéo, AlexandreAs Olimpíadas de Ciência têm o potencial de divulgar e motivar os alunos para a ciência, estimular a construção do conhecimento científico e promover o desenvolvimento de novas metodologias em contexto escolar de 1.º Ciclo do Ensino Básico (CEB), bem como identificar indicadores relevantes na Educação em Ciências (Oliveira & Paixão, 2018). Neste enquadramento, foi desenhado um estudo piloto para implementar, pe...
Measurement of the compressive crack resistance curve of composites using the s...
Catalanotti, Giuseppe; Xavier, José; Camanho, PedroThis paper presents a new methodology to measure the compressive crack resistance curve of the longitudinal plies of carbon-epoxy laminates. The methodology is based on three main steps: the first one corresponds to the determination of the energy release rate of cross-ply laminates with two edge cracks using a parametric finite element model. The energy release rate is used in the definition of a relation betw...
High strain rate characterisation of intralaminar fracture toughness of GFRPs f...
Catalanotti, Giuseppe; Kuhn, Peter; Xavier, José; Koerber, HannesThe elastic parameters, strengths, and intralaminar fracture toughness are determined for an E-Glass polymer composite material system, statically and at high strain rate, adapting methodologies previously developed by the authors for different carbon composites. Dynamic experiments are conducted using tension and compression Split-Hopkinson Bars (SHBs). A unique set of experimental parameters is obtained, and ...
Global Patterns of Species Richness in Coastal Cephalopods
Rosa, Rui; Pissarra, Vasco; Borges, Francisco O.; Xavier, José; Gleadall, Ian G.; Golikov, Alexey; Bello, Giambattista; Morais, LilianeWithin the context of global climate change and overfishing of fish stocks, there is some evidence that cephalopod populations are benefiting from this changing setting. These invertebrates show enhanced phenotypic flexibility and are found from polar regions to the tropics. Yet, the global patterns of species richness in coastal cephalopods are not known. Here, among the 370 identified-species, 164 are octopus...