Arte “Esquemática” de ar livre na bacia do Ave (Portugal, NO Ibérico): espacialidade, contexto, iconografia e cronologia

A primeira compilação de arte rupestre de ar livre realizada para a bacia do Ave, no NO de Portugal, permitiu inventariar um certo número de gravuras que se inserem genericamente na denominada arte de tradição esquemática. O trabalho realizado, a diferentes escalas de análise, possibilitou dar especial atenção à localização espacial e ao contexto físico de implantação deste tipo de manifestações rupestres; a estudos sobre a morfologia dos afloramentos gravados; à sua iconografia e a eventuais fases de gravação. Foi colocada a hipótese da existência de duas fases distintas dentro deste tipo de gravuras. Uma primeira, com motivos abstratos, foi considerada Neolítica e a segunda, com antropomorfos com toucados e portadores de mãos grandes, do Calcolítico, perdurando pela Idade do Bronze. Verificou-se, ainda, a frequência destes lugares na longa diacronia através de adições de podomorfos e paletas, genericamente considerados do 1º milénio a.C. Os responsáveis pela arte esquemática foram consideradas grupos portadores de uma cosmogonia animista.Open air “schematic” art in the Ave basin (Portugal, NW Iberia): spatiality, context, iconography and chronology The first corpus of rock art corpus created for the basin of the river Ave (NW Portugal) has allowed to identify some “Schematic” rock art places that were synthesize and discuss in this paper. The data were studied through different perspectives: spatial and physical contexts; morphology of the engraved outcrops and its iconography. Results allowed to put the hypothesis of two distinct chronological phases. The first one, with abstract motives, was considered to date from the Neolithic. The second phase, characterized by different types of anthropomorphic (with headdresses and large hands), was inserted from the Chalcolithic, enduring throughout the Bronze Age. Many of these places have been active in the long term. This has been materialized by adding or overlapping new motives such as footprints and palettes, which usually date back to the first millennium B.C. Those responsible for the schematic art were considered to have an animist cosmogony.info:eu-repo/semantics/publishedVersio

Caça e pastorícia no calcolítico do NW de Portugal: o caso da estação arqueológica de Bitarados

Os autores publicam as primeiras evidências arqueozoológicas relacionadas com a pastorícia e com a caça detectadas no Calcolítico do Noroeste do País, recolhidas no sítio arqueológico de Bitarados (concelho de Esposende) as quais foram objecto de comparação com os resultados obtidos para outras áreas do Noroeste Peninsular.Hunting and pastoralism in the Calcolithic of the NW of Portugal: the case study of Bitarados - The authors publish the first bones of animals related to the pastoral and the hunting found in the Calcolithic of the Northwest of Portugal, collected in the archaeological site of Bitarados (municipality of Esposende) which have been compared with results for other areas of the Northwest of Iberia

Contribution to the characterization of cork's use-life

Oxygen permeability data is relevant for selecting wine bottle closures, but the impact of wine contact, temperature, and time use has not yet been explained. Market available stoppers were analysed for oxygen ingress over time in stoppered bottles, under different temperatures, with and without contact between the cork and wine simulant. The Weibull model described well the oxygen ingress. Differences were found between cork types, in long-term oxygen pressure values and ingress rates. The temperature effect followed an Arrhenius behaviour, with statistical significance only for micro agglomerated corks. Micro agglomerated corks exhibited slower initial oxygen ingress but higher long-term oxygen ingress than natural corks. Principal Component Analysis (PCA) showed that factors related to the bottleneck-cork interface contributed more to the variance of the system than the cork type. Liquid contact reduces oxygen ingress rate around five times. The temperature impact in the oxygen ingress was lower for natural corks than for micro agglomerated corks.info:eu-repo/semantics/publishedVersio

Convolutional Neural Networks Applied to Antimony Quantification via Reflectance Spectroscopy Using Soils from Northern Portugal: Opportunities and Challenges

Antimony (Sb) has gained significance as a critical raw material (CRM) within the European Union (EU) due to its strategic importance in various industrial sectors, particularly in the textile industry for flame retardants and as a component of Sb-based semiconductor materials. Moreover, Sb is emerging as a potential alternative for anodes used in lithium-ion batteries, a key element in the Energy transition. This study focused on exploring the feasibility of identifying and quantifying Sb mineralizations through the spectral signature of soils using reflectance spectroscopy, a non-invasive remote sensing technique, and by employing deep learning algorithms such as Convolutional Neural Networks (CNNs). Common signal preprocessing techniques were applied to the spectral data, and the soils were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Despite achieving high R-squared values, the study faces a significant challenge of generalization of the model to new data. Despite the limitations, this study provides valuable insights into potential strategies for future research in this field.</jats:p

Mapping atmospheric pollutants emissions in European countries

In this paper we present a methodology which enables the graphical representation, in a bi-dimensional Euclidean space, of atmospheric pollutants emissions in European countries. This approach relies on the use of Multidimensional Unfolding (MDU), an exploratory multivariate data analysis technique. This technique illustrates both the relationships between the emitted gases and the gases and their geographical origins. The main contribution of this work concerns the evaluation of MDU solutions. We use simulated data to define thresholds for the model fitting measures, allowing the MDU output quality evaluation. The quality assessment of the model adjustment is thus carried out as a step before interpretation of the gas types and geographical origins results. The MDU maps analysis generates useful insights, with an immediate substantive result and enables the formulation of hypotheses for further analysis and modeling

Monitorização da presença de hidrocarbonetos halogenados aromáticos policíclicos, resultantes dos processos de desinfeção de águas

Objetivo: Este trabalho teve como objetivo monitorizar a presença de derivados clorados e bromados do Pireno (Pir) e do Benzo(a)antraceno (BaA) na água

Trust and fake news: Exploratory analysis of the impact of news literacy on the relationship with news content in Portugal

In order to understand the role of contemporary journalism and the media system it is vital to consider consumers’ relationship with news content in terms of trust and perception of dubious content. This analysis is particularly relevant in a context where intense flows of information raise serious questions about individual ability to interpret, validate, and reproduce content. This analysis explores a news literacy scale used by Maskl et al. (2015) and Fletcher (in Newman et al., 2018) to investigate the links between news literacy profiles and their relationship with content, with particular focus on illegitimate/doubtful news pieces. Results suggest individuals with higher news literacy tend to trust news in general but not when content originates in social media. Higher literacy profiles are also associated with increased concern regarding online content legitimacy. These conclusions are particularly relevant in the currently volatile media sphere, highly dependent on a substantially informed public to ensure the legitimacy and importance of journalistic content and to distinguish it from other kinds of content flooding communication networks. These efforts depend not only on the journalistic sphere but also on democratic systems themselves as they rely on a well-informed public to guarantee a healthy and inclusive debate.In order to understand the role of contemporary journalism and the media system it is vital to consider consumers’ relationship with news content in terms of trust and perception of dubious content. This analysis is particularly relevant in a context where intense flows of information raise serious questions about individual ability to interpret, validate, and reproduce content. This analysis explores a news literacy scale used by Maskl et al. (2015) and Fletcher (in Newman et al., 2018) to investigate the links between news literacy profiles and their relationship with content, with particular focus on illegitimate/doubtful news pieces. Results suggest individuals with higher news literacy tend to trust news in general but not when content originates in social media. Higher literacy profiles are also associated with increased concern regarding online content legitimacy. These conclusions are particularly relevant in the currently volatile media sphere, highly dependent on a substantially informed public to ensure the legitimacy and importance of journalistic content and to distinguish it from other kinds of content flooding communication networks. These efforts depend not only on the journalistic sphere but also on democratic systems themselves as they rely on a well-informed public to guarantee a healthy and inclusive debate

Supercritical antisolvent precipitation of PHBV microparticles

The micronization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) from organic solutions using supercritical antisolvent (SAS) technique has been successfully achieved. SASexperiments were carried out at different operational conditions and microspheres with mean diameters ranging from 3 to 9 mwere obtained. The effect of CO2 and liquid flow, temperature and pressure on particle size and particle size distribution was evaluated. The microspheres were precipitated from a dichloromethane (DCM) solution. The best process conditions for this mixture were, according to our study, 40 ◦C, 100 bar, 1mLmin−1 liquid flow and 10 L min−1 carbon dioxide flow. Experiments with polymers containing different HV percentages were carried out. The powders obtained became more spherical as the HV content decreased

Environmental status of water and sediment around submarine outfalls – west coast of Portugal = Qualidade da água e dos sedimentos na zona circundante de oito emissários submarinos – costa oeste de Portugal

The sea along the western coast of Portugal presents hydrodynamic conditions that place it among the most favourable of European coastal waters for dilution and dispersion of waste water. Thus it is an appropriate zone for the location of submarine outfalls. According to the European Union Directives and Portuguese Regulations the waste waters produced by this densely populated coast should be treated, therefore 18 wastewater treatment plants with submarine outfalls were built along the coast. Between 2002 and 2004, five sampling campaigns were performed in seven outfalls that were selected to participate in water and sediment quality surveys supported by INAG (Portuguese Water Institute), and performed by the Hydrographic Institute of the Portuguese Navy. The water quality assessment was based on 10 chemical and physical parameters, including heavy metals. The results were compared with reference values and data from the largest flow outfall located at Guia, which has an autonomous monitoring program. In order to evaluate significant differences in water quality between years and sampling sites, statistical analyses were performed. S ediments were evaluated for grain size, heavy metals, PAH, hydrocarbons, chlorinated pesticides and PCB. In order to evaluate the level of pollution of the different areas where the outfalls are located, the concentration factor (CF) (sediment/water elemental concentration ratio) was calculated and compared with the recommended values for the CF of each element. The water sampling program did not allow identifying a clear seasonal evolutionary pattern. The environmental status of the waters surrounding the outfalls discharges comply, to a great extent, with the reference values proposed by INAG and did not revel high levels of contaminants. Due to the low sorptive capacity of the sediment for contaminants, trace metals, hydrocarbons and PAHs have a low environmental impact. The values of the concentration factors for metals are below the recommended values

Nota sobre paleocorrentes na formação vermelha de Marco Furado (Península de Setúbal)

Empregou-se a análise de paleocorrentes, com o intuito de investigar a proveniência do material que constitui a formação vermelha de Marco Furado, descrita em trabalho anterior. Os resultados parecem confirmar as hipóteses aí postas, uma vez que apresentam certa zona da serra da Arrábida como centro emissor do mesmo material. Descreve-se também um achado de indústria lítica no mesmo depósito, o qual permite conferir-lhe um limite de idade máxima.info:eu-repo/semantics/publishedVersio