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Experimental testing of Asymmetric Underwater Acoustic Networks
Vilaipornsawai, U.; Silva, António J.; Jesus, S. M.The coordinated operation of multiple vehicles within the framework of multipoint non-cabled observatories and offshore activities sprung the necessity for complex underwater acoustic networks (UANs). An example of such UAN consisting of fixed and mobile underwater nodes, was recently developed and tested at sea. A star-shaped network topology was adopted, where wide area network (WAN) integration was ensured t...
Peak career in world-ranked swimmers: age’s analysis of 2008 Beijing Olympic Ga...
Barbosa, Tiago M.; Costa, Mário J.; Mejias, Erik; Marinho, Daniel A.; Louro, Hugo; Silva, António J.The aim of this paper was to: (i) describe the Beijing 2008 Olympic Games swimmer’s ages and; (ii) compare ages according to swimmer’s gender. It was analyzed 1101 inscriptions (588 men and 513 women) for all swimming events held at the Beijing 2008 Olympic Games: 50 meters freestyle (L50), 100 meters freestyle (L100), 200 meters freestyle (L200), 400 meters freestyle (L400), 800 meters freestyle (L800, only wo...
Linking acoustic communications and network performance: integration and experi...
Caiti, N.; Grythe, Knut; Hovem, Jens M.; Jesus, S. M.; Lie, Arne; Munafò, Andrea; Reinen, Tor Arne; Silva, António J.; Zabel, FriedrichAbstract—Underwater acoustic networks (UANs) are an emerging technology for a number of oceanic applications, ranging from oceanographic data collection to surveillance applications. However, their reliable usage in the field is still an open research problem, due to the challenges posed by the oceanic environment. The UAN project, a European-Union-funded initiative, moved along these lines, and it was one of t...
The TV-APM interface: a web service for collaborative modelling
Rodriguez, O. C.; Silva, António J.; Zabel, Friedrich; Jesus, S. M.Current development of Internet access, together with available zero-cost Open Source applications (like, for instance, PHP, Python, etc.) can be integrated in order to minimize the constrains induced by the geographical separation of international centers, which collaborate in a given project. The advantage of such approach lies in the sharing of common analysis methods, without particular constrains to specif...
Density functional theory method for non-equilibrium charge transport calculati...
Novaes,Frederico D.; Silva,Antônio J. R. da; Fazzio,A.We describe a procedure to calculate charge transport properties across a nanosystem. This scheme is based on a Green's Function formalism to treat a non-equilibrium problem, coupled to the Density Functional Theory to describe the electronic structure. As an illustration, we perform calculations for the charge transport across a (5,5) carbon nanotube with a vacancy.
Effects of disorder on the exchange coupling in (Ga,Mn)As diluted magnetic semi...
Silva,Antônio J. R. da; Fazzio,A.; Santos,Raimundo R. dos; Oliveira,Luiz E.A theoretical study of the effects of disorder on the Mn-Mn exchange interactions for Ga1-xMn xAs diluted magnetic semiconductors is presented. The disorder is intrinsically considered in the calculations, which are performed using an ab initio total energy density-functional approach, for a 128 atoms supercell, and by considering a variety of configurations with 2, 3 and 4 Mn atoms. Results are obtained for th...
Un cadastre romain dans la région de Pax Iulia (Lusitanie)?
Lopes, Maria Conceição; Encarnação, José d'; Silva, António J. M.Levanta-se a hipótese de ser cadastro romano uma placa de xisto que apresenta linhas geométricas e uma inscrição que, por enquanto, se revela de difícil interpretação.
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