25 documents found, page 1 of 3
Evaluation of tensile properties in in-plane auxetic carbon/epoxy and carbon-gl...
Veloso, Cristiano; Mota, Carlos; Cunha, Fernando; Sousa, Jose; Dias, Gustavo; Uribe, Braian Esneider Buitrago; Fangueiro, RaúlAuxetic laminates, i.e. with a negative Poisson’s ratio (NPR), show great engineering promise, with enhancements in shear resistance, fracture toughness, energy absorption, and delamination and damage extension limitation. This study focuses on the tensile properties of in-plane (IP) NPR fibre-reinforced polymer (FRP) laminates, namely carbon/epoxy (C/E) and carbon-glass/epoxy (C-G/E) laminates, with lay-up seq...
Upcycling fishing net waste and metal oxide from electroplating waste into alga...
Barros, Daniel; Nobre, Luís; Antunes, Joana; Bessa, João; Cunha, Fernando Eduardo Macedo; Mota, Carlos; Gomes, Fernanda Isabel AntunesPlastic waste, especially discarded fishing nets, and electroplating sludges pose significant environmental challenges, impacting marine ecosystems and contributing to pollution. In alga cultivation, invasive microorganisms often hinder growth, necessitating strategies to combat these issues. This study aimed to develop recycled substrates for alga cultivation by repurposing fishing nets and enhancing their sur...
Blast fragment impact of angle-ply composite structures for buildings wall prot...
Barros, Daniel; Mota, Carlos; Bessa, João; Cunha, Fernando Eduardo Macedo; Rosa, Pedro; Fangueiro, RaúlThis paper investigates the fragment performance of several composite panels for attaching to the inside walls of a building structure. These panels were developed using different types of fiber woven fabrics (W0, W90) combined with distinct layers orientations (angle-ply effect) of L0/0 and L0/15. Aramid, E-glass, and S-glass fiber fabrics impregnated with thermosetting epoxy resin, and a prepreg of Ultra High...
Comparison of zinc oxide nanoparticle integration into non-woven fabrics using ...
Ferreira, Tânia; Vale, Ana Catarina; Pinto, Alexandra C.; Costa, Rita V.; Pais, Vânia; Sousa, Diana; Gomes, Fernanda Isabel Antunes; Pinto, GraçaThe development of advanced facemasks stands out as a paramount priority in enhancing healthcare preparedness. In this work, different polypropylene non-woven fabrics (NWF) were characterised regarding their structural, physicochemical and comfort-related properties. The selected NWF for the intermediate layer was functionalised with zinc oxide nanoparticles (ZnO NPs) 0.3 and 1.2wt% using three different method...
The Portuguese Large Wildfire Spread database (PT-FireSprd)
Benali, Akli; Guiomar, Nuno; Gonçalves, Hugo; Mota, Bernardo; Silva, Fábio; Fernandes, Paulo M.; Mota, Carlos; Penha, Alexandre; Santos, JoãoWildfire behaviour depends on complex interactions between fuels, topography, and weather over a wide range of scales, being important for fire research and management applications. To allow for significant progress towards better fire management, the operational and research communities require detailed open data on observed wildfire behaviour. Here, we present the Portuguese Large Wildfire Spread database (PT...
Advanced coatings of poplyureas for building blast protection: physical, chemic...
Leite, Fernando; Mota, Carlos; Bessa, João; Cunha, Fernando; Fangueiro, Raúl; Gomes, Gabriel; Mingote, JoséDue to the increase in the global terrorist threat, there has been a growing demand for materials that can more efficiently protect civil, industrial, and military structures against explosions. In this sense, two new commercial polyureas (A and B), that present high potential to be used as a protective coating on building facades against explosions, were compared in this work, through several tests. Chemical c...
Study of the filtration performance of multilayer and multiscale fibrous struct...
Pais, Vânia Nascimento; Mota, Carlos; Bessa, João; Dias, José Guilherme; Cunha, Fernando Eduardo Macedo; Fangueiro, RaúlAs the incidence of small-diameter particles in the air has increased in recent decades, the development of efficient filtration systems is both urgent and necessary. Nanotechnology, more precisely, electrospun nanofibres, has been identified as a potential solution for this issue, since it allows for the production of membranes with high rates of fibres per unit area, increasing the probability of nanoparticle...
Determinantes da Rentabilidade Bancária: Evidências para o Setor Bancário Portu...
Mota, CarlosResumoObjetivo: O objetivo deste artigo é analisar os determinantes da rentabilidade do setor bancário português, a partir de uma amostra constituída por dados semestrais de um painel dos onze maiores bancos universais a operar no mercado português no período 2006-2016.Metodologia: Parte da definição de um modelo econométrico cujas variáveis independentes combinam as caraterísticas específicas dos bancos e os f...
Determinants of bank efficiency: the portuguese case
Vilaça, Eduardo; Mota, Carlos; Pereira, Adalmiro; Silva, Eduardo; Vaz, ÂngelaThe objective of this study is to evaluate the technical efficiency of the Portuguese banking sector in the most recent period and to identify the determinants that explain it. Methods: The methodology used consisted on the application of the non-parametric approach, Data Envelopment Analysis (DEA), to estimate the technical efficiency of the banks, in the period between the first semester of 2005 and the first...
Determinantes da rentabilidade bancária: evidências para os maiores bancos port...
Mota, Carlos; Silva, Bruno; silva, eduardoObjetivo: O objetivo deste artigo é analisar os determinantes da rentabilidade do setor bancário português, a partir de uma amostra constituída por dados semestrais de um painel dos onze maiores bancos universais a operar no mercado português no período 2006-2016. Metodologia: Parte da definição de um modelo econométrico cujas variáveis independentes combinam as caraterísticas específicas dos bancos e os fatore...