Browsing by Author "Almeida, C."
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- Air and Underwater Survey of water enclosed spaces for VAMOS! ProjectPublication . Almeida, J.; Ferreira, A.; Matias, B.; Dias, A.; Martins, A.; Silva, F; Oliveira, J.; Sousa, P.; Moreira, M.; Miranda, T.; Almeida, C.; Silva, E.This paper addresses a three-dimensional (3D) reconstruction of a flooded open pit mine with an autonomous surface vehicle (ASV) and unmanned aerial vehicle (UAV). The ROAZ USV and the Otus UAV were used to provide the underwater bathymetric map and aerial 3D reconstruction based from image data. This work was performed wihtin the context of the European researcj project VAMOS with the objective of developing robotic tools for efficient underwater mining
- Autonomous bathymetry for risk assessment with ROAZ robotic surface vehiclePublication . Ferreira, H.; Almeida, C.; Martins, A.; Almeida, J.; Dias, N.; Dias, A.; Silva, E.The use of unmanned marine robotic vehicles in bathymetric surveys is discussed. This paper presents recent results in autonomous bathymetric missions with the ROAZ autonomous surface vehicle. In particular, robotic surface vehicles such as ROAZ provide an efficient tool in risk assessment for shallow water environments and water land interface zones as the near surf zone in marine coast. ROAZ is an ocean capable catamaran for distinct oceanographic missions, and with the goal to fill the gap were other hydrographic surveys vehicles/systems are not compiled to operate, like very shallow water rivers and marine coastline surf zones. Therefore, the use of robotic systems for risk assessment is validated through several missions performed either in river scenario (in a very shallow water conditions) and in marine coastlines.
- Modelo in vitro de polarização de macrófagos modelado pelo shift hormonal em diabetes tipo 2Publication . Almeida, C.; Rocha, A. C.; Soares, R.; Baylina, Pilar; Costa, R.; Alves, M. G.; Fernandes, R.; BAYLINA MACHADO, PILARExistem diferentes estímulos que polarizam macrófagos in vitro, estando descritos 2 principais fenótipos: M1 e M2. Entre esses estímulos, o efeito da testosterona e do estradiol neste processo ainda não é totalmente compreendido. Sabe-se que em ambiente diabético existe uma redução da concentração de testosterona e um aumento progressivo de estradiol. As citocinas inflamatórias são respostas produzidas após diferenciação dos macrófagos.
- ROAZ Autonomous Surface Vehicle Design and ImplementationPublication . Ferreira, Hugo; Martins, A.; Dias, A.; Almeida, C.; Almeida, J. M.; Silva, E. P.The design of an Autonomous Surface Vehicle for operation in river and estuarine scenarios is presented. Multiple operations with autonomous underwater vehicles and support to AUV missions are one of the main design goals in the ROAZ system. The mechanical design issues are discussed. Hardware, software and implementation status are described along with the control and navigation system architecture. Some preliminary test results concerning a custom developed thruster are presented along with hydrodynamic drag calculations by the use of computer fluid dynamic methods.