24 documents found, page 1 of 3
Assessing short-range Shore-to-Shore (S2S) and Shore-to-Vessel (S2V) wifi commu...
D'Orey, Pedro; Gutiérrez Gaitán, Miguel; Santos, Pedro Miguel; Ribeiro, Manuel; Sousa, J. Borges de; Almeida, LuísWireless communications increasingly enable ubiquitous connectivity for a large number of nodes, applications and scenarios. One of the less explored scenarios are aquatic ecosystems, specially when enabled by near-shore and short-range communications. Overwater communications are impaired by a number of distinguishing dynamic factors, such as tides, waves or node mobility, that lead to a widely fluctuating and...
Fineness effect evaluation on the mechanical activity index of glass powder
Jesus, Carlos Manuel Gonçalves; Camões, Aires; Malheiro, Raphaele Lira Meireles Castro; Ribeiro, Manuel; Aguiar, J. L. Barroso deThe increase in CO2 emissions from the cement industry over the years has had an important negative effect on the global environment. In this context, the use of supplementary cementitious materials for cement replace-ment has a decisive role in the cement industry since using waste from other in-dustries has important environmental benefits, including a decrease in CO2 emissions from the decrease in cement use...
Eco-efficient mortars for sustainable construction: A comprehensive approach
Reis, Rui Jorge Alves Cunha; Camões, Aires; Ribeiro, Manuel; Malheiro, Raphaele Lira Meireles CastroCement production is responsible for approximately 7% of global carbon dioxide emissions. Despite our efforts, we have not been able to find a competitive substitute that is both reliable and environmentally friendly. The easiest way to solve the issue is to rationalize resources and try to minimize their use by replacing them with other materials. The current market shortage and reduced initial strength have l...
Moyamoya Disease in Adult: A Clinical Case
Matias Costa, Marta; Pereira, Leopoldina; Resende, Mário; Baggen Santos, Raúl; Ribeiro, ManuelMoyamoya disease is an entity characterized by progressive and prolonged occlusion of the terminal intracranial portion of the internal carotid artery and of the Willis polygon. We present the case of a 33-year-old female patient observed in the Emergency Department of Internal Medicine for sudden onset right hemiparesis. Anamnesis revealed no family history for increased risk for thrombosis, an unmedicated dys...
Acute kidney injury after endovascular therapy in acute stroke patients: system...
Oliveira, Marta; Rocha, Ana; Barbosa, Flávia; Barros, Pedro; Almeida, Luísa; Ribeiro, Manuel; Afreixo, Vera; Gregório, TiagoAims Endovascular therapy (EVT) is a highly effective stroke treatment, but it requires the administration of contrast media which puts patients at risk of acute kidney injury (AKI). AKI is associated with increased morbidity and mortality in cardiovascular patients. Methods PubMed, Scopus, ISI and the Cochrane Library were systematically searched for observational and experimental studies assessing the occurre...
Nationwide Access to Endovascular Treatment for Acute Ischemic Stroke in Portugal
Dias, Mariana Carvalho; Reis, Ricardo Soares dos; Santos, João Vasco; Nunes, Ana Paiva; Ferreira, Patricia; Maia, Bruno; Fragata, Isabel; Reis, JoaoIntroduction: Since the publication of endovascular treatment trials and European Stroke Guidelines, Portugal has re-organized stroke healthcare. The nine centers performing endovascular treatment are not equally distributed within the country, which may lead to differential access to endovascular treatment. Our main aim was to perform a descriptive analysis of the main treatment metrics regarding endovascular ...
Empirical Evaluation of Short-Range WiFi Vessel-to-Shore Overwater Communications
d'Orey, Pedro; Gutiérrez Gaitán, Miguel; Santos, Pedro M.; Ribeiro, Manuel; Sousa, J. Borges de; Almeida, LuísUnmanned vehicles used in ocean science, defense operations and commercial activities collect large amounts of data that is further processed onshore. For real-time information exchange, the wireless link between the unmanned vehicle and onshore devices must be reliable. In this work, we empirically evaluate a WiFi link between an autonomous underwater vehicle on the surface and an onshore device under real-wor...
Improving WiFi communication with surface nodes at near-shore on tidal waters
Gutiérrez Gaitán, Miguel; d'Orey, Pedro; Santos, Pedro Miguel; Ribeiro, Manuel; Pinto, Luis; Almeida, Luís; de Sousa, J. BorgesWireless radio links deployed in aquatic areas (e.g., sea, rivers, lakes, estuaries) are affected by the conductive properties of the water surface, strengthening signal reflections and increasing destructive interference. Recurrent natural phenomena (e.g. tides or waves) cause shifts in water levels further impairing propagation over water surfaces. In this work, we aim to mitigate the detrimental impact of ti...
Nationwide Access to Endovascular Treatment for Acute Ischemic Stroke in Portugal
Dias, Mariana Carvalho; dos Reis, Ricardo Soares; Santos, João Vasco; Nunes, Ana Paiva; Ferreira, Patricia; Maia, Bruno; Fragata, Isabel; Reis, JoaoIntroduction: Since the publication of endovascular treatment trials and European Stroke Guidelines, Portugal has re-organized stroke healthcare. The nine centers performing endovascular treatment are not equally distributed within the country, which may lead to differential access to endovascular treatment. Our main aim was to perform a descriptive analysis of the main treatment metrics regarding endovascular ...
Wireless radio link design to improve nearshore communication with surface node...
Gutiérrez Gaitán, Miguel; d'Orey, Pedro; Santos, Pedro Miguel; Ribeiro, Manuel; Pinto, Luís; Almeida, Luís; Sousa, J. Borges deWireless radio links deployed over aquatic areas (e.g., sea, estuaries or harbors) are affected by the conductive properties of the water surface, strengthening signal reflections and increasing interference effects. Recurrent natural phenomena such as tides or waves cause shifts in the water level that, in turn, change the interference patterns and cause varying impairments to propagation over water surfaces. ...