Browsing by Author "Alves, R."
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- Application of hyaluronic acid in non-surgical treatment of periodontitisPublication . Lobato, J.; Alves, R.; Izidoro, C.; Nemésio, M.; Vilhena, M. S.; Sardinha, S.
- Mechanical construction and installation of the ATLAS tile calorimeterPublication . ATLAS Tile Calorimeter collaboration (234 authors); Alves, R.; Amaral, P.; Carvalho, J.; David, M.; Gomes, A.; Maio, A.; Marques, C.; Onofre, A.; Pereira, A.; Pina, J.; Pinhão, J.; Santos, J.; Saraiva, J.G.; Silva, J.This paper summarises the mechanical construction andinstallation of the Tile Calorimeter for the ATLASexperiment at the Large Hadron Collider in CERN, Switzerland. The TileCalorimeter is a sampling calorimeter using scintillator as the sensitivedetector and steel as the absorber and covers the central region of the ATLASexperiment up to pseudorapidities ±1.7. The mechanical construction ofthe Tile Calorimeter occurred over a periodof about 10 years beginning in 1995 with the completionof the Technical Design Report and ending in 2006 with the installationof the final module in the ATLAS cavern. Duringthis period approximately 2600 metric tons of steel were transformedinto a laminated structure to form the absorber of the sampling calorimeter.Following instrumentation and testing, which is described elsewhere, themodules were installed in the ATLAS cavern with a remarkable accuracy fora structure of this size and weight.
- The benefit of macrolide therapy in patients with pneumococcal pneumonia is only present in patients with bacteremiaPublication . Gonçalves-Pereira, J.; Costa, L.; Silva, I.; Simões, A.; Froes, F.; Mergulhão, P.; Varela Ramos, P.; Leal, D.; Alves, R.; Custódio, M.; Gomes, A.
- The benefit of macrolide therapy in patients with pneumococcal pneumonia is only present in patients with bacteremiaPublication . Gonçalves-Pereira, J.; Costa, L.; Silva, I.; Simões, A.; Froes, F.; Mergulhão, P.; Varela Ramos, P.; Leal, D.; Alves, R.; Custódio, M.; Gomes, A.
- The calibration system for the photomultiplier array of the SNO+ experimentPublication . SNO+ collaboration (23 authors); Alves, R.; Andringa, S.; Carvalho, J.; Chauhan, D.; Gurriana, L.; Maio, A.; Maneira, J.; Seabra, L.A light injection system using LEDs and optical fibres was designed for the calibration and monitoring of the photomultiplier array of the SNO+ experiment at SNOLAB. Large volume, non-segmented, low-background detectors for rare event physics, such as the multi-purpose SNO+ experiment, need a calibration system that allow an accurate and regular measurement of the performance parameters of their photomultiplier arrays, while minimising the risk of radioactivity ingress. The design implemented for SNO+ uses a set of optical fibres to inject light pulses from external LEDs into the detector. The design, fabrication and installation of this light injection system, as well as the first commissioning tests, are described in this paper. Monte Carlo simulations were compared with the commissioning test results, confirming that the system meets the performance requirements.
- The LED and fiber based calibration system for the photomultiplier array of SNO+Publication . SNO+ collaboration (22 authors); Seabra, L.; Alves, R.; Andringa, S.; Carvalho, J.; Gurriana, L.; Maio, A.; Maneira, J.A new external LED/fiber light injection calibration system was designed for the calibration and monitoring of the photomultiplier array of the SNO+ experiment at SNOLAB. The goal of the calibration system is to allow an accurate and regular measurement of the photomultiplier array's performance, while minimizing the risk of radioactivity ingress. The choice in SNO+ was to use a set of optical fiber cables to convey into the detector the light pulses produced by external LEDs. The quality control was carried out using a modified test bench that was used in QC of optical fibers for TileCal/ATLAS. The optical fibers were characterized for transmission, timing and angular dispersions. This article describes the setups used for the characterization and quality control of the system based on LEDs and optical fibers and their results.
- Tratamento da peri-implantite: conceitos atuaisPublication . Izidoro, C.; Vilhena, M. S.; Nemésio, M.; Alves, R.Nos últimos anos a colocação de implantes tornou-se uma das técnicas mais preconizadas na reabilitação de desdentados totais ou parciais, sobretudo devido à elevada percentagem de sucesso que lhe está associada. Não obstante, existem algumas complicações, quer a curto, quer a longo prazo, que podem comprometer o êxito desta técnica. A peri-implantite é uma das complicações mais frequentes associadas aos implantes dentários. O objetivo desta revisão é apresentar o “estado da arte” no tratamento da peri-implantite.