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Active Assistance for Senior Healthcare: A Wearable System for Fall Detection
Terroso, Miguel; Freitas, Ricardo; Gabriel, Joaquim; Marques, António Torres; Simões, RicardoElders lose independence and wellbeing, accompanied by decreased functions in terms of hearing, vision, strength and coordination abilities. These factors contribute to balance difficulties that eventually lead to falls. The injuries due to falls, at this age, are risky, since most of the times may cause a significant – and permanent – decrease of quality of life or, in extreme cases, death. In this context, a ...
Evaluation of ultrasonic aluminium degassing by piezoelectric sensor
Puga, Hélder; Gabriel, Joaquim; Barbosa, J.; Seabra, Eurico; Ribeiro, Carlos Silva; Prokic, MiodragThe purpose of this work was the development of a reliable technique to evaluate the intensity of acoustic cavitation during degassing of aluminium melts and to use it to select the optimum processing time for an envisaged degassing efficiency. A high sensitivity piezoelectric disk type device was used as a sensing feedback in water and liquid AlSi9Cu3 alloy. The signal acquisition and processing was carried ou...
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