Browsing by Issue Date, starting with "2023-04-13"
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- Deception Island 1967–1970 volcano eruptions from historical aerial frames and satellite imagery (Antarctic Peninsula)Publication . Prates, Gonçalo; Torrecillas, Cristina; Berrocoso, Manuel; Goyanes, Gabriel; Vieira, GonçaloAerial frames and satellite imagery are widely recognized data sources from which to produce maps. For volcanoes, maps enable the quantification of erupted ash and the destruction caused. The last eruptive sequence on Deception Island was endured from 1967 to 1970. Analogue maps were produced via classical photogrammetric methods with a high degree of human intervention mainly to analyse the volcanic-centres areas only. However, historical aerial frames cover the whole of Deception Island. Structure from motion photogrammetry, a near-automated compilation of digital image processing strategies, minimizes the degree of human intervention to produce orthographic mosaics and digital elevation models from digital aerial frames. Orthographic mosaics were produced from historical aerial frames of 1956 and 1968, and a Kompsat-3 image of 2020. Their shared rootmean-square deviation was 1.8 m and 1.7 m in easting and northing, respectively, at ground control points measured with phase-differential global navigation satellite systems. The digital elevation models were processed with a root-mean-square deviation of 2.3 m and 3.6 m from 1956 and 1968 aerial frames, respectively. As the first application, erupted ashfall and the subsequent destruction, mainly at the former Chilean and British bases, were identified, and the volume of erupted ash was assessed to be over 0.16 km3 within the area mapped by these new digital cartographic products.
- Multidimensional indicators to assess the sustainability of demersal small-scale fishery in the AzoresPublication . Pereira, Inês Sofia Teixeira; Santos, Régis Vinícius Souza; Erzini, KarimThe Azorean demersal fishery sector is one of the most important in the archipelago. As a small-scale fishery, it plays an important role in the livelihood of the community, being a source of employment and income, and contributing to poverty alleviation. Because fisheries are a complex system, a multidisciplinary approach that includes socioeconomic indicators is required for a broader assessment of fishery sustainability. This study analyzes the Azorean bottom longline fishery using the Fishery Performance Indicators tool, regarding its ecology, economy, and community indicators. The findings indicated that the fishery is mostly sustainable, although there is still opportunity for improvement. Its ecological indicators had a good performance, mainly due to the effort and work of the scientific community that makes continuous studies to examine the state of its stocks. The economic indicators are in good condition as well, but some obstacles stopped the indicator from obtaining a better performance; mainly the landing volatility and the fishery’s main source of capital (subsidies), which can make the fishery less competitive. Finally, its community indicator had a very good performance, which reflects the fishery's socioeconomic and cultural relevance for the Azores.
- O impacto das alterações do ritmo circadiano no desempenho cognitivo e equilíbrio emocionalPublication . Mendes, André Moura; Reis, Alexandra; Silva, DinaA implementação do trabalho diurno e noturno aumentou a preocupação com a saúde do trabalhador e com o impacto que essa rotatividade pode ter nos acidentes de trabalho, na vida social e familiar do trabalhador, na sua cognição e saúde-mental, bem como na qualidade do sono. O presente estudo pretende analisar o impacto das alterações do ritmo circadiano em trabalhadores noturnos, no desempenho cognitivo e na regulação emocional. Para tal foram comparados dois grupos: um composto por trabalhadores noturnos e outro composto por trabalhadores diurnos. Os resultados mostraram que os trabalhadores do turno noturno não diferem de forma significativa dos trabalhadores do turno diurno nas medidas de desempenho cognitivo, queixas de memória, qualidade do sono e saúde mental, ainda que exista uma tendência para maior sintomatologia depressiva e resultados inferiores a nível cognitivo e de qualidade do sono nos trabalhadores com turno noturno.