24 documents found, page 1 of 3
Experimental observation of the motion of ions in a resonantly driven plasma wa...
Turner, M.; Walter, E.; Amoedo, C.; Torrado, N.; Lopes, N.; Sublet, A.; Bergamaschi, M.; Pucek, J.; Mezger, J.; van Gils, N.; Verra, L.We show experimentally that an effect of motion of ions, observed in a plasma-based accelerator, depends inversely on the plasma ion mass. The effect appears within a single wakefield event and manifests itself as a bunch tail, occurring only when sufficient motion of ions suppresses wakefields. Wakefields are driven resonantly by multiple bunches, and simulation results indicate that the ponderomotive force ca...
Global hydrological dataset of daily streamflow data from the Reference Observa...
Turner, S.; Hannaford, J.; Barker, L.J.; Suman, G.; Armitage, R.; Killeen, A.; Griffin, A.; Davies, H.; Kumar, A.; Dixon, H.; Albuquerque, Maria TeresaData were provided by national measuring agencies following a selection process from their wider networks. Following submission of data and metadata to the ROBIN Network, a quality control process was conducted centrally to assess the quality and suitability of the station's inclusion in the dataset. Daily streamflow records were visually screened for change points, visually anomalous conditions indicating meth...
Influência dos rejeitos de uma mina de sulfuretos na qualidade da água de drena...
Araújo, J.; Fonseca, R.; Albuquerque, Maria Teresa; Silva, N.; Silva, R.The GeoMatRe project aims to find low-cost solutions for water and sediment rehabilitation using raw geomaterials, in abandoned mines of the Iberian Pyritic Belt. One of our case studies is the Caveira mine in southwestern Portugal, where large piles of mining waste, containing significant amounts of metals, record the long history of its exploitation for Au and Ag. After the exhaustion of its reserves, the ext...
Observação do nível de contaminação nos sedimentos de cursos de água do Sistema...
Fonseca, R.; Araújo, J.; Silva, N.; Albuquerque, Maria TeresaFollowing the present work inserted in the GeoMatRe Project, an ongoing project funded by Fundação La Caixa, the conditions of the most updated physical and chemical parameters of an Acid Mine Drainage are analysed, a critical situation which occurs in the mining area of Caveira (Grândola, Portugal), abandoned since the 60’s. It is intended, within the scope of the project, to observe the conditions of contamin...
COMPARISON OF THE OUTCOMES OF OPEN AND LAPAROSCOPIC RECTAL CANCER SURGERIES: RE...
Leite, J. S.; Pimentel, J.; Silva, P. C.; Gíria, J.; Alves, F. C.; Semedo, L.; Venâncio, J.; Guimarães, L.; Rui, M.; Brito, M. J.; Fonseca, R.Introduction: This study aimed to compare the 3-year rates of local recurrence (LR) and overall survival (OS) for open (OPEN) and laparoscopic (LAP) surgeries in a Portuguese registry. Material and Methods: This observational study included patients who underwent rectal cancer resection performed in 16 hospitals between July 2014 and December 2019. The radiologic staging and the specimen images of the first thr...
Feeling better in the presence of others: It may depend on whether you are a ma...
Garcia-Marques, T.; Prada, M.; Fonseca, R.; Fernandes, A.Previous research has suggested that it is good to have other people around us. Indeed, there seems to be a generally positive impact of the presence of others on individuals’ physical and psychological well-being. In the current work, we examine if these positive experiences may be promoted by the mere presence of nonsignificant others in our environment, during a brief period. Specifically, in two experiments...
Complete pathological response (pCR) in gastroesophageal cancer: Correlation wi...
Cabral, Francisco; Cruz, A.; Casaca, R.; Monteiro, C.; Ramos, P.; Pedro, C.; Brandão, F.; Fonseca, R.; Ratão, P.; Saldado, L.; Pinto, Iola; Abecasis, N.Purpose. - Neoadjuvant chemoradiotherapy (nCRT) followed by surgery in patients with resectable esophageal or esophagogastric junctional (GEJ) (Siewert I) cancer is associated with long term overall survival benefits. Up to one third of all patients submitted to nCRT present pathological complete response (pCR). F-18-fluorodeoxyglucose positron emission tomography with CT (F-18-FDG PET-CT) is an important tool ...
Estudo geoambiental de resíduos de mineração de ouro em contexto de economia ci...
Lemos, Mariana Gazire; Valente, T.; Marinho Reis, A. Paula; Fonseca, R.[Excerto] Um dos grandes desafios atuais no ambito da mineracao no Brasil 6 o tratamento e a otimizacao dos recursos naturals. A necessidade de reducao de residuos enviados a barragens de rejeitos, associada as ditimas tragedias de Mariana e Brumadinho-MG, a crescents dificuldade de obtencao de licencas ambientais e locals adequados para a sua disposicao, sao fatores que promovem o processamento destes material...
Interplay between the Weibel instability and the Biermann battery in realistic ...
Shulka, N.; Schoeffler, K.; Boella, E.; Vieira, J.; Fonseca, R.; Silva, L. O.Our setup allows the Weibel instability and its interplay with the Biermann battery to be probed in laser-driven collisionless plasmas. Ab initio particle-in-cell simulations of the interaction of short (≤1ps) intense (a0≥1) laser pulses with overdense plasma targets show observable Weibel generated magnetic fields. This field strength surpasses that of the Biermann battery, usually dominant in experiments, as ...
Traffic Vertical Signposting: Materials Characterization and Structural Numeric...
Franco, M.; Fonseca, R.; Gomes, S.; Biscaia, S.; Brites, F.; Pascoal-Faria, P.; Mateus, A.The existing metallic solutions used for vertical traffic signs are associated with higher costs and environmental issues due to their manufacturing and degradation, when compared with polymeric solutions. Thus, the development of vertical signs considering the injection from polymeric materials in order to overcome problems related with sustainability, maintenance costs, and to achieve higher resistance to cor...