FCT2-Artigos (em revistas ou actas indexadas)
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- Strong solutions for the Navier–Stokes–Voigt equations with non-negative densityPublication . Borges de Oliveira, Hermenegildo; Khompysh, Kh.; Shakir, A. G.The aim of this work is to study the Navier–Stokes–Voigt equations that govern flows with non-negative density of incompressible fluids with elastic properties. For the associated nonlinear initial-and boundary-value problem, we prove the global-in-time existence of strong solutions (velocity, density and pressure). We also establish some other regularity properties of these solutions and find the conditions that guarantee the uniqueness of velocity and density. The main novelty of this work is the hypothesis that, in some subdomain of space, there may be a vacuum at the initial moment, that is, the possibility of the initial density vanishing in some part of the space domain.
- Média-Arte Digital: Criação de artefactos visuais experimentais pós-fotográficosPublication . Ligarretto Feo, RennierEste texto deriva do projeto de pesquisa-criação submetido ao Doutorado em Média-Arte Digital da UAB-UAlg e a pesquisa apresenta o desenvolvimento de uma prática artística que aborda a criação de arte factos visuais ligados à pós-fotografia para questionar o sistema educacional atual. Para isso, a expressão da arte digital baseia-se conceitualmente na cultura visual digital a partir de uma abordagem pós-qualitativa fundamentada no método a/r/cográfico como ação para o trabalho colaborativo com alunos de diversos cursos cujo processo de formação teórico/ prática inclui o trabalho participativo com a comunidade. Além disso, um diário de campo é utilizado como repositório de ideias, técnicas e estéticas para vincular o processo co-criativo. Os resultados mostram a expansão do ato comunicativo com formatos analógicos e digitais típicos da pós-fotografia, também fica comprovado que a experimentação visual gera processos criativos híbridos para a média-arte digital. Da mesma forma, reitera-se que o uso de pedagogias emergentes ligadas à cultura maker transforma o papel do aluno e o torna um agente prosumer onde sua voz esta ligada no processo criativo. Conclui-se que o uso de media tático facilita a exploração de formatos experimentais visuais que permitem ao artista canalizar o ato comunicativo para expandir a mensagem da obra, enquanto o trabalho colaborativo com os alunos gera literacia mediática no ato educomunicativo.
- Modeling and optimization of atmospheric CO2 capture for neutralization of high alkaline wastewaters using response surface methodologyPublication . Madeira, Luís Miguel Simão; Ribau Teixeira, Margarida; Carvalho, FátimaLab-scale stirrer bubble and lab-scale stepped continuous flow capillary columns were developed to neutralize lime precipitation treated slaughterhouse wastewater (SWW) and recover the volatilized ammonia, using atmospheric CO2. These experiments were carried out using central composite design based on the response surface methodology. The carbonation process occurred in both processes. For the bubbling process, numerical optimization indicated a final pH of 8 with calcium and ammonium nitrogen removals of 76.0 and 66.2%, respectively, applying 21 h, air flow rate at 65 L h− 1, the stirring speed at 52 rpm, and SWW volume at 178 mL. It was also observed that increasing the air flow rate can avoid the stirring step. For the capillary process, a pH of 8.2 and calcium and ammonium nitrogen removals of 81.0 and 57.5% were achieved, applying a SWW flow rate at 1.2 mL min− 1, air flow rate at 90 L h− 1, and capillary area at 700 cm2. Under optimal conditions, the flow capillary column was able to neutralize different SWW volumes, 178–478 mL, without significant differences in the collected samples, with the operation time varying between 4.48 and 10.20 h, respectively.
- Ecological and syntaxonomic analysis of the communities of glebionis coronaria and G. discolor (Malvion neglectae) in the European Mediterranean areaPublication . Cano, Eusebio; Cano-Ortiz, Ana; Quinto Canas, Ricardo; Piñar Fuentes, Jose Carlos; Meireles, Catarina Rodrigues; Raposo, Mauro; Gomes, Carlos Pinto; Laface, Valentina Lucia Astrid; Spampinato, Giovanni; Musarella, Carmelo MariaNitrophilous communities dominated by Glebionis coronaria and Glebionis discolor in the European Mediterranean area were studied. The nomenclature was corrected according to the current taxonomy, following the International Code of Phytosociological Nomenclature (ICPN). The statistical analysis revealed six new associations and one subassociation, with four in Spain, one in Greece, and one in Italy. Additionally, a subassociation of high relevance due to its endemic character was identified. These grasslands exhibit requirements for organic matter and other edaphic nutrients that are closer to those of Malva neglecta communities than to those of Hordeum murinum subsp. leporinum. We confirmed the published syntaxon with the rank of Resedo albae-Glebionenion coronariae suballiance and its subordination to the Malvion neglectae alliance, and we established the type association for this suballiance. Sisimbrietalia officinalis J. Tüxen in Lohmeyer et al. 1962 em. Rivas-Martínez, Báscones, T. E. Díaz, Fernández-González & Loidi 1991. Stellarietea mediae Tüxen, Lohmeyer & Preising ex von Rochow 1951.
- Perspectives of people living with Type 2 diabetes about physical activity promotion: can community pharmacies be part of the solution?Publication . Viegas, Ruben; Moura, Izabela; Cavaco, Afonso; Ramos, Filipa Duarte; Mendes, Romeu; Costa, Filipa Alves daRationale: People living with type 2 diabetes (T2D) benefit from regular physical activity (PA) to reduce cardiovascular risk and better manage comorbidities. Pharmacists can provide support to increase physical activity by leveraging the regular interactions on their daily community pharmacy practice. Aims and Objectives: This study aimed to explore the perspectives of people living T2D about their engagement in PA using pharmacies as the subject of interest to collect this information. Methods: This study followed a focus group technique using a semi‐structured guide. People living with T2D were recruited in community pharmacies resorting to typical case sampling. Five in person focus group interviews with 23 patients living with T2D were conducted by the research team. Interviews were recorded following consent, transcribed verbatim, coded independently by two researchers and analysed using the socio‐ecologic model. Results: A total of 23 people living with T2D were interviewed. Aspects determining PA engagement ranged from individual aspects such as physical limitations; interpersonal aspects such as having a reference pharmacist; organisational aspects such as activities done through the pharmacy; community aspects such as the cost of exercise activities and policy aspects such as information registry. Conclusions: This study suggests that community pharmacies are currently not considered by people living with diabetes as a source for behaviour change linked to PA but explores possible ways on how this could become a reality in the future.
- Unveiling the behavioural significance of the Aterian coarse-grained lithic assemblages: insights from use-wear analysis of Rhafas Cave, Northeast MoroccoPublication . Djellal, Youssef; Bouzouggar, Abdeljalil; Talbi, El Hassan; Longet, Benoit; Ghayati, Noufel; Pedergnana, Antonella; Marreiros, JoaoRecent discoveries have shown that Homo sapiens has a Pan-African origin, and North Africa has been an important region for the development and expansion of its biological and cultural traits. Early manifestations of Homo sapiens complex behaviour in North Africa are tied to the emergence of the Aterian culture around 150 ka BP. The Aterian repertoire includes stone, bone, and ivory tools, vegetal, animal and marine remains, as well as pigment and perforated shells for symbolic expressions. Within this cultural package, investigating the typotechnological variability observed in the stone tool assemblage is crucial to better understanding the emergence and development of Homo sapiens behaviour. However, the latter can only be fully reconstructed when complemented with the study of the tools’ function. Use-wear studies on Aterian lithics are very limited including coarse-grained materials despite their abundance in several Aterian sequences. This study presents the results of the use-wear analysis on the quartzite assemblage from the Aterian sequence of Rhafas cave. A use-wear experimental reference collection was created, against which the diagnostic use-wear on archaeological artefacts was compared. Sequential experiments demonstrated the dynamic performance and suitability of quartzite tools when subjected to mechanical stress during working of different materials. The analysis of the archaeological assemblage, guided by the experimental reference collection, revealed diagnostic use-wear associated with wood and bone working. In sum, our study shows the suitability, and the complementary role of quartzite tools in the technological versatility of the Aterian groups.
- Studies on the bioaugmentation of mycolicibacterium aubagnense HPB1.1 in aerobic granular sludge from a WWTP: adaptability of native prokaryotes and enhancement of paracetamol intermediate metabolites biodegradationPublication . Carlier, Jorge; Lara-Moreno, Alba; Igbodo, Benjamin; Costa, Maria ClaraThis study aimed to evaluate for the first time the bioaugmentation of Mycolicibacterium aubagnense HPB1.1 in Sequencing Batch Reactors (SBRs) with Aerobic Granular Sludge (AGS), and its effect on the biodegradation of Paracetamol, also known as Acetaminophen and N -acetyl-paraaminophenol (APAP). The bioaugmentation was effective and persisted for at least nine days after five inoculations performed in 24 days (relative abundance of M. aubagnense was 0.13 ± 0.05 % in the test reactors and 0.0079 ± 0.0008 % in the control reactors) and for eight days after seven inoculations performed in 40 days (relative abundance of M. aubagnense was 0.04 ± 0.02 % in the tests and 0.0005 ± 0.0005 % in the controls). In what concerns APAP biodegradation, the results showed a faster removal of its transformation products Hydroquinone (HQ), 2,5-dihydroxy-1,4- benzoquinone (2,5-HO-BQ) and 1,4-benzoquinone (BQ) in the bioreactors bioaugmented with the bacterial strain M. aubagnense HPB1.1 (59 % or 85 % of HQ, 67 % or 85 % of 2,5-HO-BQ and 75 % or 82 % of BQ removals, respectively for assay 1 or assay 2) in comparison to the nonbioaugmented bioreactors (15 % or 31 % of HQ, 36 % or 63 % of 2,5-HO-BQ and no removal of BQ, also for assy 1 and 2, respectively). Regarding the effect on organics and nutrients treatment, overall, the SBR conditions favored ammonia, nitrites, and organics removal. Yet, the conditions did not allow complete denitrification nor higher assimilation than release of PO4 3-.
- Grand complementary Morrey spaces and Hardy operatorsPublication . Rafeiro, Humberto; Samko, Stefan; Umarkhadzhiev, SalaudinWe introduce grand complementary Morrey spaces, in a general form, on open sets 훺 in ℝn. In case of unbounded sets 훺, this requires the notion of aggrandizer. We find natural conditions on the aggrandizer under which the grand space is larger than the initial space. We provide a counterexample showing that this embedding is strict in general. In the case 훺 = ℝn, we study weighted Hardy operators with radial weights and find conditions for their boundedness in grand complementary Morrey spaces. In case of quasi-monotone weights, we also show that the conditions on the weight in terms of Matuszewska–Orlicz indices sufficient for the boundedness of Hardy operators in complementary Morrey spaces also remain to be sufficient for grand complementary Morrey spaces.
- Printed circuit boards leaching followed by synthesis of gold nanoparticle clusters using plant extractsPublication . Nobahar, Amir; Lourenço, João P.; Costa, Maria Clara; Carlier, JorgeThis work investigates the potential of 70% ethanolic leaf extracts of Rubus idaeus L., Cistus ladanifer L. and Erica andevalensis in the metal separation from synthetic unimetallic solutions of different metals and a leachate obtained from the leaching of PCBs. Results from the experiments with unimetallic solutions revealed R. idaeus and E. andevalensis extracts induced separation of more than 95% of the initial Au(III), while C. ladanifer separated ~78% of this metal. Thereafter, application of three plant extracts to real Au bearing leachate obtained from PCBs leaching, revealed about 96, 95 and 90% Au recovery with R. idaeus, C. ladanifer and E. andevalensis extracts, respectively with 15–60% co-removal of Pb and less than 15% of other metals. The reduction of Au(III) ions into Au(0) nanoparticles by R. idaeus extract was confirmed by molecular UV–Visible, and FT-IR analysis showed the involvement of plant secondary metabolites in Au bio-reduction and bio-stabilization. Particles obtained from the application of R. idaeus extract to the leachate were initially analyzed with XRD and results confirmed the presence of Au(0) with contamination of PbSO4, which was completely removed by washing with 1 M HCl. Thereafter, results from STEM-EDS analysis showed the presence of Au particles conjugated with organic material and other metals. Consequently, particles were subjected to another washing step with acetone. Afterwards, STEMEDS showed pure Au microparticle clusters (~0.8 μm) with flower-shaped or apparently cubic morphologies, and HRSTEM showed the tiny nanoparticles (~20 nm), which form the clusters.
- Effects of light quality and intensity on growth and bromoform content of the red seaweed Asparagopsis taxiformisPublication . Gonçalves Torres, Raquel; Campos, Ana Margarida; Goldman, Jacob; Barrote, Isabel; Mata, Leonardo; Silva, JoãoSpecies of the genus Asparagopsis are rich in halogenated bioactive compounds, particularly bromoform. Its use as a feed additive in ruminant livestock drastically decreases the animal’s methane production, thereby reducing the industry’s environmental impact. Addressing the high demand for Asparagopsis biomass requires the understanding of the culture conditions that promote higher growth rates and bromoform content. Here we evaluated how different light quality combinations (High-Blue:Red, Medium Blue:Red, High-Blue:Green:Red, and White) and four light intensities (30, 60, 90 and 120 μmol photons m−2 s −1) affect the growth and bromoform content of the Asparagopsis taxiformis tetrasporophyte in indoor tumbling cultures at two biomass densities. We also assessed the effect of light intensity on the photosynthetic response by measuring oxygen evolution rates. Light spectra containing intermediate wavelengths promoted higher growth, regardless of biomass density. Of the different light qualities tested, white light promoted the highest bromoform content. Increasing light intensity led to a positive response in A. taxiformis growth. However, the photosynthetic parameters estimated showed that the two higher light intensity treatments were above the saturation irradiance, for both culture densities. This, along with the observed development of contamination, suggests that long-term cultures of A. taxiformis should be maintained at light intensities no higher than 60 μmol photons m−2 s −1. In addition, we found that exposing cultures to higher irradiances does not guarantee a bromoform-richer biomass. These results offer valuable insights for optimizing biomass and bioactive compound production in indoor cultures of the Asparagopsis genus.