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Dual-Cylinder Magnus Effect Kite: Fixed-Distance Flight Tests at Wind Fisher

Boucheriguene, Yacine (author), Smith, Garrett (author), Tardella, Armand (author), Carvalho, Estéban (author), Nègre, Amaury (author), Meslem, Nacim (author), Dumon, Jonathan (author)

conference paper 2024

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Modeling and Control of a Magnus Effect Kite: Pumping Cycle with Reversing Rotation

Boucheriguene, Yacine (author), Carvalho, Estéban (author), Smith, Garrett (author), Tardella, Armand (author)

conference paper 2024

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Influence of geometrical imperfections and residual stresses on the reliability of high strength steel welded I-section columns using Monte Carlo simulation

Ferreira Filho, José Osvaldo (author), da Silva, Luís Simões (author), Tankova, T. (author), Carvalho, Hermes (author)

This paper aims to assess the influence of geometrical imperfections and residual stresses on the reliability of the stability design rules for steel columns in Eurocode 3 considering a full probabilistic approach and further validate the new buckling curves in the scope of the ongoing revision of the Structural Eurocodes. A reliability...

journal article 2024

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Lateral-torsional buckling resistance of non-prismatic and prismatic mono-symmetric I-section steel beams based on stress utilization

Gomes, J. O. (author), Simões da Silva, L. (author), Tankova, T. (author), Carvalho, H. (author), Filho, J. O. Ferreira (author)

The lateral-torsional resistance of prismatic double-symmetric I-section beams is accurately predicted using a mechanically consistent Ayrton-Perry approach, combined with a calibrated generalized imperfection. The corresponding design formulation was recently adopted in the revised version of Eurocode 3. However, for prismatic mono-symmetric...

journal article 2024

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Simulation of two-phase flow in 3D fractured reservoirs using a projection-based Embedded Discrete Fracture Model on Unstructured tetrahedral grids (pEDFM-U)

Cavalcante, Túlio de M. (author), Castiel Reis de Souza, A. (author), Hajibeygi, H. (author), Carvalho, Darlan K.E. (author), Lyra, Paulo R.M. (author)

The modeling of fluid flow in heterogeneous, anisotropic and fractured porous media is relevant in many applications, including hydrocarbon and groundwater extraction, dispersion of contaminants, hydrogen or carbon dioxide (CO₂) storage. Thus, accurate and scalable simulation of fluid flow through these formations continues to be a...

journal article 2024

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Quadrature-Resolved Dissipative Optomechanical Measurement

Pinho, Pedro V. (author), Primo, Andre G. (author), Carvalho, Natalia C. (author), Benevides, Rodrigo (author), Kersul, Caue M. (author), Groeblacher, S. (author), Wiedehecker, Gustavo S. (author), Mayer Alegre, Thiago P. (author)

We present a homodyne detection scheme to reliably measure the dissipative coupling in optomechanical systems. Our method is validated on silicon devices yielding GK_e/GΩ= -0.007 ± 0.001.

conference paper 2023

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High-resolution P- and S-wave reflection studies of an intraplate structure: The Azambuja fault, Portugal

Ghose, R. (author), Carvalho, João (author), Alves, Daniela V. (author), Santos, Luiz Alberto (author), Ressurreição, Ricardo (author), Alves, Paulo Henrique Bastos (author), Leote, Jaime (author)

The Azambuja fault is a NNE trending structure located 50 km north of Lisbon, the capital and most populous city of Portugal. The fault has been considered as a possible source for the historical, large earthquakes. Understanding this fault is a priority in seismic hazard evaluation of this region. The fault has a clear morphological...

journal article 2023

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Numerical analysis and discussion on the hot-spot stress concept applied to welded tubular KT joints

Vieira Ávila, Bianca (author), Correia, J.A.F.O. (author), Carvalho, Hermes (author), Fantuzzi, Nicholas (author), De Jesus, Abílio (author), Berto, Filippo (author)

Nominal stresses have been used for a long time for the assessment of fatigue resistance of welded joints, however, this approach has strong limitations since the definition of the nominal stress may be subjective for complex welded details and/or complex loading. On the other hand, the hot-spot stress approach has been proposed to overcome...

journal article 2022

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Photo2Video: Semantic-Aware Deep Learning-Based Video Generation from Still Content

Viana, Paula (author), Andrade, Maria Teresa (author), Carvalho, Pedro (author), Vilaça, Luis (author), Teixeira, Inês N. (author), Costa, Tiago (author), Jonker, P.P. (author)

Applying machine learning (ML), and especially deep learning, to understand visual content is becoming common practice in many application areas. However, little attention has been given to its use within the multimedia creative domain. It is true that ML is already popular for content creation, but the progress achieved so far addresses...

journal article 2022

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Controlled spatial organization of bacterial growth reveals key role of cell filamentation preceding Xylella fastidiosa biofilm formation

Anbumani, Silambarasan (author), da Silva, Aldeliane M. (author), Carvalho, Isis G.B. (author), Fischer, Eduarda Regina (author), de Souza e Silva, Mariana (author), von Zuben, Antonio Augusto G. (author), Carvalho, Hernandes F. (author), de Souza, Alessandra A. (author), Janissen, R. (author), Cotta, Monica A. (author)

The morphological plasticity of bacteria to form filamentous cells commonly represents an adaptive strategy induced by stresses. In contrast, for diverse human and plant pathogens, filamentous cells have been recently observed during biofilm formation, but their functions and triggering mechanisms remain unclear. To experimentally identify...

journal article 2021

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Lanthanopolyoxometalate-Silica Core/Shell Nanoparticles as Potential MRI Contrast Agents

Carvalho, Rui F.S. (author), Pereira, Giovannia A.L. (author), Rocha, João (author), Castro, M. Margarida C.A. (author), Granadeiro, Carlos M. (author), Nogueira, Helena I.S. (author), Peters, J.A. (author), Geraldes, Carlos F.G.C. (author)

The NMR relaxivities of the decatungstolanthanoate core-shell nanoparticles, prepared by encapsulating [Ln(W₅O₁₈)₂]⁹⁻ polyoxometalates (LnPOM) within amorphous silica shells (K₉[Ln(W₅O₁₈)₂]@SiO₂), were studied along the Ln series. The relaxivity...

journal article 2021

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Integrating inland and coastal water quality data for actionable knowledge

El Serafy, G.Y.H. (author), Schaeffer, Blake A. (author), Neely, Merrie-Beth (author), Spinosa, A. (author), Odermatt, Daniel (author), Weathers, Kathleen C. (author), Baracchini, Theo (author), Bouffard, Damien (author), Carvalho, Laurence (author)

Water quality measures for inland and coastal waters are available as discrete samples from professional and volunteer water quality monitoring programs and higher-frequency, near-continuous data from automated in situ sensors. Water quality parameters also are estimated from model outputs and remote sensing. The integration of these data,...

review 2021

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Heterogeneous impact of a lockdown on inter-municipality mobility

Melo, Hygor P.M. (author), Henriques, João (author), Carvalho, Raquel (author), Verma, T. (author), Da Cruz, João P. (author), Araújo, N. A.M. (author)

Without a vaccine, the fight against the spreading of the coronavirus has focused on maintaining physical distance. To study the impact of such measures on inter-municipality traffic, we analyze a mobile dataset with the daily flow of people in Portugal in March and April 2020. We find that the reduction in inter-municipality traffic depends...

journal article 2021

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Antimicrobial and Antibiofilm Properties of Fluorinated Polymers with Embedded Functionalized Nanodiamonds

Nunes-Pereira, João (author), Costa, Pedro (author), Fernandes, Liliana (author), Carvalho, Estela O. (author), Fernandes, Margarida M. (author), Carabineiro, Sónia A.C. (author), Buijnsters, J.G. (author), Tubio, Carmen R. (author), Lanceros-Mendez, Senentxu (author)

Environmentally resilient antimicrobial coatings are becoming increasingly required for a wide range of applications. For this purpose, nanocomposite thin films of poly(vinylidene fluoride) (PVDF) filled with several types of functionalized nanodiamonds (NDs) were processed by solvent casting. The effects of ND inclusion and functionalization...

journal article 2020

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Exploiting Bacteriophage Proteomes: The Hidden Biotechnological Potential

Santos, Sílvio B. (author), Costa, Ana Rita (author), Carvalho, Carla (author), Luzia de Nobrega, F. (author), Azeredo, Joana (author)

Bacteriophages encode many distinct proteins for the successful infection of a bacterial host. Each protein plays a specific role in the phage replication cycle, from host recognition, through takeover of the host machinery, and up to cell lysis for progeny release. As the roles of these proteins are being revealed, more biotechnological...

journal article 2018

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Earthquake-faulting-related deformation in soil evidenced in S-wave shallow reflection data: Field results from Portugal

Carvalho, João (author), Ghose, R. (author), Alves, D. (author), Leote, J (author)

Expressions of ductile, soft-sediment deformations induced by ground movements due to past earthquakes are difficult to recognize in near-surface soils. We have carried out shallow S-wave reflection studies in a seismically active area located northeast of metropolitan Lisbon, Portugal. Identifying shallow disturbed zones and hidden fault...

journal article 2016

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Nanowire arrays as cell force sensors to investigate adhesin-enhanced holdfast of single cell bacteria and biofilm stability

Sahoo, Prasana K. (author), Janissen, R. (author), Monteiro, Moniellen P. (author), Cavalli, Alessandro (author), Murillo, Duber M. (author), Merfa, Marcus V. (author), Cesar, Carlos L. (author), Carvalho, Hernandes F. (author), De Souza, Alessandra A. (author), Bakkers, E.P.A.M. (author), Cotta, Monica A. (author)

Surface attachment of a planktonic bacteria, mediated by adhesins and extracellular polymeric substances (EPS), is a crucial step for biofilm formation. Some pathogens can modulate cell adhesiveness, impacting host colonization and virulence. A framework able to quantify cell-surface interaction forces and their dependence on chemical surface...

journal article 2016

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Connecting through the reinforcement: Design, testing and construction of a folded reinforced glass structure

Carvalho, P.L. (author), Cruz, P.J.S. (author), Veer, F.A. (author)

A reinforced glass folded structure has been developed using an innovative connection method. The concept relies on extending the reinforcement outwards from the laminated glass and using it to transfer a significant part of the load. The goal is to accomplish a glass element with high stiffness, connected by using a discrete almost invisible...

journal article 2014

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The Role of Volunteered Geographic Information towards 3D Property Cadastral Systems

Duarte De Almeida, José-Paulo (author), Haklay, Muki (author), Ellul, Claire (author), Carvalho, Maria-Manuel (author)

General mapping, and particularly cadastral mapping, is a highly expensive activity and many governments are no longer willing to continue covering the even increasing costs of surveys. As far as Portugal is concerned – our ultimate field of interest – ongoing 2D property cadastre surveys have revealed to be rather complex, laborious and...

conference paper 2014

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Helium implanted RAFM steels studied by positron beam Doppler Broadening and Thermal Desorption Spectroscopy

Carvalho, I. (author), Schut, H. (author), Fedorov, A. (author), Luzginova, N. (author), Desgardin, P. (author), Sietsma, J. (author)

Reduced Activation Ferritic/Martensitic steels are being extensively studied because of their foreseen application in fusion and Generation IV fission reactors. To mimic neutron irradiation conditions, Eurofer97 samples were implanted with helium ions at energies of 500 keV and 2 MeV and doses of 5x1015-1016 He /cm2, creating atomic...

journal article 2013