Browsing by Author "Melo, Maria"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Desenvolvimento preliminar de um algoritmo de reconhecimento facial em tempo real através de redes neurais convolucionaisPublication . Rocha, Diana; Pereira, João; Melo, Maria; Bispo, Bruno C.; Rodrigues, Pedro M.Este trabalho apresenta os resultados preliminares do desenvolvimento de um algoritmo de reconhecimento facial em tempo real através de redes neurais convolucionais (CNNs) .Elementos faciais, nomeadamente, rosto, boca, nariz e olhos, são detectados pelo algoritmo de Viola-Jones. Cada elemento facial é utilizado para treinar uma CNN. Os resultados de treinamento mostram uma acurácia de identificação de 100%. Testes em tempo real demonstram necessidade de aprimoramento. A base de imagens será futuramente ampliada para realização de um rigoroso procedimento de treinamento e teste do algoritmo.
- Helicopter aeromedical transport of critically patients: recent past and present historyPublication . Encarnação, Paula; Melo, Maria; Lage, MariaBackground: Emergency Medicine has its modern roots in the First World War. In Portugal, the first medical emergency system dates back to 1965. The Helicopter Emergency Medical Service of the National Institute of Medical Emergency (INEM) started operating in 1997. Objective: To inform about the history and current situation of the helicopter aeromedical transport of critically ill patients through the two major institutions in Portugal: the INEM and the Portuguese Air Force (FAP). Methodology: A qualitative historical study was conducted through documental analysis of the primary sources provided by the Portuguese Air Force and the National Institute of Medical Emergency, as well as the secondary sources. Results: The results suggest that the creation of a model for sharing air assets between various institutions leads to a more effective and efficient transport of critically ill patients. Conclusion: Further studies should be conducted to reveal the historical role played by the teams of physicians, nurses, commanders and pilots in Portugal.
- Packed ionic resins to perform solid phase extraction (SPE) and solid phase spectrophotometry (SPS) for metal ions determination and speciation in a smart sampling approachPublication . Mesquita, Raquel; Pereira, Mafalda; Melo, Maria; Ribas, Tânia; Rangel, AntónioThe adverse effects in the environment of metal ions are well documented, notably for those displaying toxic effects for living organisms according to their concentration. Novel sampling and real-time monitoring methods will have a significant impact on understanding the spatial-temporal distribution of the metal ions and will contribute to act on-time to detect and mitigate sources of contamination of aquatic systems. So, a project, Aqua_Smart, has been implemented to devise an integrated smart sampling and automatic monitoring of toxic metal ions in aquatic systems. The aim is to attain metal ions assessment by employing on-site smart sampling approaches to tackle the bioavailability of some metallic ions in different water bodies. The idea relies upon the use of solid phase extraction (SPE) for analyte retention as a replacement for transporting high volumes of samples to the laboratory. The SPE process is achieved by using ionic exchange resins to selectively collect the analytes, and, for analysis, we propose to use flow- based methods, like sequential injection (SI) analysis (Mesquita & Rangel, 2009) with miniaturized optical detection. The use of an automated SI method with optical detection in the flow cell also enables to carry out the determination in the solid phase itself in a solid phase spectrophotometry approach. This approach efficiency is demonstrated with the speciation of iron(II) and iron(III) in different types of natural waters. Additionally, for employing ionic exchange for the metal ion retention, the charge of the ion is highly relevant, and although most metal ions are cations in aquatic systems, it is also known that some metal ions form chloro-complexes with chloride, resulting in negatively charged complexes. So, considering the chloride content of high salinity waters like seawater, some metal ions, namely cobalt, are indeed complexed. Consequently, another approach for smart sampling is the use of polymer inclusion membranes, PIMs. These can be described as a thin, flexible and stable polymeric film that presents the property of selectively separating solute/s of interest depending on the composing extractant. These membranes can be prepared by using an ion-exchanger immobilized in a polymeric matrix. A PIM prepared for anionic species retention may act as exchangers to selectively collect a specific metal ion negatively charged complex from an aquatic system, after being incorporated in miniaturized devices. After a proof-of-concept of this process, previously demonstrated for the cobalt determination in sea water, several studies of the PIM preparation were carried out. These studies aimed to obtain the best performance in flow methods of the PIM as a sorbent. For this purpose, an electrospinning process was used to produce solid fibres.