31 documents found, page 1 of 4
Computational approaches to explainable artificial intelligence: Advances in th...
Górriz, J. M.; Álvarez-Illán, I.; Álvarez-Marquina, A.; Arco, J. E.; Atzmueller, M.; Ballarini, F.; Barakova, E.; Bologna, G.; Bonomini, P.Deep Learning (DL), a groundbreaking branch of Machine Learning (ML), has emerged as a driving force in both theoretical and applied Artificial Intelligence (AI). DL algorithms, rooted in complex and non-linear artificial neural systems, excel at extracting high-level features from data. DL has demonstrated human-level performance in real-world tasks, including clinical diagnostics, and has unlocked solutions t...
Sustainable Additives for the Production of Hydrogen via Sodium Borohydride Hyd...
Gomez-Coma, Lucia; Silva, Diogo; Ortiz, A.; Rangel, C. M.; Ortiz-Martínez, V. M.; Pinto, A. M. F. R.; Ortiz, InmaculadaABSTRACT: Finding stable solutions for hydrogen storage is one of the main challenges to boosting its deployment as an energy vector and contributing to the decarbonization of the energy sector. In this context, sodium borohydride (NaBH4) has been largely studied as a hydrogen storage material due to its significant advantages, such as low pressure, stability, and high hydrogen storage density. The development ...
Students with disabilities in higher education in Portugal
Nogueira, J.; Querido, L.; Nunes, N.; Ortiz, A.; Botelho, M. C.This article analyses the legislative and academic progresses in inclusive higher education, focusing on existing accessibility conditions for students with special educational needs (SEN) in Higher Education Institutions (HEIs) in Portugal. Through the analysis of secondary sources, national documents, recent data, and a case study from a higher education institution, it is shown that there is increasing imple...
Imigração
Pires, R. P.; Pereira, C.; Ortiz, A.Na União Europeia (UE), Portugal é um país com uma taxa de imigração intermédia: em percentagem da sua população, Portugal só tem mais imigração do que os países da Europa do Leste. Em contrapartida, Portugal é o país europeu com mais emigração, continuando a ter, em termos acumulados, mais emigrantes do que imigrantes. Porém, nos últimos anos a imigração tem superado a emigração. O saldo migratório voltou a se...
Política integrada e portugueses ciganos: O caso de educação de adultos de 2020...
Pereira, C.; Milagre, C; Ortiz, A.Em Portugal a resposta das políticas públicas em matéria de educação de adultos tem passado por várias etapas, com avanços e recuos, até à atual configuração mais robusta e adaptada à realidade social do país. Contudo ainda persistem várias lacunas no que respeita ao alcance e à efetividade da mesma. As diferenças em termos de educação escolar entre os portugueses ciganos e a população em geral são claras deven...
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton ...
Teixeira, António P.S.; Teixeira, Fátima C.; Rangel, C. M.; Sá, Ana I. de; Ortiz, A.; Ortiz, I.; Ortiz-Martínez, V. M.Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes, at differ...
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton ...
Teixeira, Fatima; de Sá, A.I.; Teixeira, António P. S.; Ortiz-Martínez, V. M.; Ortiz, A.; Ortiz, Inmaculada; Rangel, C. M.ABSTRACT: Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes,...
Potential Use of Near-Infrared Spectroscopy to Predict Fatty Acid Profile of Me...
Ortiz, A.; Parrini, S.; Tejerina, D.; Araújo, J.P.P.; Čandek-Potokar, M.; Crovetti, A.; Garcia-Casco, J.M.; González, J.; Hernández-García, F.I.Autochthonous pig breeds provide products of differentiated quality, among which quality control is difficult to perform and insufficient for current market requirements. The present research evaluates the predictive ability of near‐infrared (NIR) spectroscopy, combined with chemometric methods as a rapid and affordable tool to assure traceability and quality control. Thus, NIR technology was assessed for intac...
New modified Nafion-biphosphonic acid composite membranes for enhanced proton c...
Teixeira, António P. S.; Teixeira, Fátima C.; Sá, Ana I. de; Rangel, C. M.; Ortiz-Martínez, V. M.; Ortiz, A.; Ortiz, I.The performance of PEM fuel cells critically depends on their proton exchange membrane structural and chemical stabilities as well as on their proton conductivity. Limitations of commercially available Nafion membranes to operating at temperatures above 80 ºC have fostered the interest in research and development of new membranes [1,2]. The aim of this work is the preparation of new modified Nafion composite me...
PSA purification of waste hydrogen from ammonia plants to fuel cell grade
Yáñez, M.; Relvas, F.; Ortiz, A.; Gorri, D.; Adélio Mendes; Ortiz, I.Industrial hydrogen-rich waste streams hold promises in their upgrading to feed fuel cell stacks. As in the ammonia synthesis process, a stream of up to 180-240 Nm(3) per ton of ammonia is purged to keep the inert gases concentration below a threshold value; this stream contains large hydrogen quantities, which could be recovered. In the current work, a four-column PSA unit has been used to produce a high-purit...