Browsing by Author "Costa, D."
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- Efeito e fatores preditivos da variação do glicerol sanguíneo induzido por eletrolipólise associada a exercício físico moderadoPublication . Couto, M; Noites, Andreia; Vilarinho, Rui; Melo, Cristina; Monteiro, Pedro; Moreira, A.; Cerqueira, Maria Manuela Amorim; Costa, D.; Adubeiro, Nuno; Nogueira, Luisa; Santos, RubimA acumulação de triglicerídeos no tecido adiposo abdominal acarreta risco acrescido para a saúde. Existem poucos estudos que demonstrem o efeito da eletrolipólise sobre o adipócito. A eletrolipólise poderá ser uma medida terapêutica coadjuvante ao exercício com o objectivo de potenciar a lipólise localizada. Assim torna-se pertinente reproduzir tais estudos, explorando se existem características individuais preditivas de mobilização lipolítica
- Exploiting the IEEE 1149.1 Standard for Software Reliability Evaluation in Space ApplicationsPublication . Zenha-Rela, M.; Cunha, J.C.; Santos, L.E.; Gameiro, M.; Gonçalves, P.; Alves, Gustavo R.; Fidalgo, André Vaz; Fortuna, P.; Maia, R.; Henriques, L.; Costa, D.The IEEE 1149.1 standard (boundary-scan) was originally developed as a technology to provide in-circuit testing of digital devices. Its effectiveness lead to unanticipated successes such as its extension to support on-line monitoring and in-circuit emulation. Meanwhile, its applicability for fault-injection had already been demonstrated by academic prototypes. In this paper we describe the first commercial tool, the BSCAN4FI plug in for Xception®, that provides support for software reliability evaluation for aeronautics and space applications using the boundary-scan technology as a means for controlled fault-injection. This tool allows transparent integration testing without any modification to the original system to be deployed and was developed specifically for the SPARC V.7 TSC695f space processor. Besides extended fault models and test features only made possible through this technology, in-system non-intrusive monitoring capabilities are also made possible.
- Influência da posição corporal na eficácia da tosse, com e sem compressão manualPublication . Peixoto, A.; Costa, D.; Alexandrino, A. S.Pretendeu-se avaliar a tosse, medindo a força muscular respiratória, através da pressão expiratória máxima, e o débito expiratório, através do peak cough flow, de acordo com a variação da posição corporal (sentado e decúbito dorsal) e com ou sem compressão tóraco-abdominal, em 33 jovens saudáveis. Obteve-se diferenças significativas (p˂0.05) com a variação da posição corporal e não se obtiveram diferenças significativas (p˃0.05) com ou sem pressão. Concluiu-se que a posição corporal tem influência significativa nos parâmetros estudados, sendo as manobras expiratórias forçadas mais efetivas na posição de sentado, já a compressão tóraco-abdominal aparenta não influenciar a eficácia da tosse.
- A life cycle inventory of microalgae-based biofuels production in an industrial plant conceptPublication . Branco-Vieira, M.; Costa, D.; Mata, T.M.; Martins, A.A.; Freitas, M.A.V.; Caetano, NídiaMicroalgae have been reported as a promising alternative for biofuels production. However, the use of microalgae for biofuels is still a challenge due to the intense energy use and the generation of a significant amount of biomass residues in the process. In order to analyze the environmental impacts of different technological processes for the production of biodiesel from microalgae, several studies have been published making use of the Life Cycle Assessment (LCA) methodology, which allows the recognition of the process bottlenecks and supports the identification of alternatives for a more efficient use of the feedstock. Therefore, in this study, a Life Cycle Inventory (LCI) is compiled, based on real pilot-scale process data, which was scaled-up to a microalgae biomass industrial plant for biofuel production. Values of energy, nutrients, water, and materials consumption are used to create an inventory of inputs and outputs for biomass cultivation and biodiesel production, in order to acquire data to conduct a complete LCA modeling in future studies. According to this model, to produce 1 kg of biodiesel it is necessary about 12 kg of dried algae biomass. This study supports the decision-making process in biofuel production to promote the development of sustainable pilot and large-scale algae-based industry, through the identification of critical factors.
- A life cycle inventory of microalgae-based biofuels production in an industrial plant conceptPublication . Branco-Vieira, M.; Costa, D.; Mata, T.M.; Martins, A.A.; Freitas, M.A.V.; Caetano, NídiaMicroalgae have been reported as a promising alternative for biofuels production. However, the use of microalgae for biofuels is still a challenge due to the intense energy use and the generation of a significant amount of biomass residues in the process. In order to analyze the environmental impacts of different technological processes for the production of biodiesel from microalgae, several studies have been published making use of the Life Cycle Assessment (LCA) methodology, which allows the recognition of the process bottlenecks and supports the identification of alternatives for a more efficient use of the feedstock. Therefore, in this study, a Life Cycle Inventory (LCI) is compiled, based on real pilot-scale process data, which was scaled-up to a microalgae biomass industrial plant for biofuel production. Values of energy, nutrients, water, and materials consumption are used to create an inventory of inputs and outputs for biomass cultivation and biodiesel production, in order to acquire data to conduct a complete LCA modeling in future studies. According to this model, to produce 1 kg of biodiesel it is necessary about 12 kg of dried algae biomass. This study supports the decision-making process in biofuel production to promote the development of sustainable pilot and large-scale algae-based industry, through the identification of critical factors.