Digital signatures have been a hot topic in the e-government era as a key enabler for e-services provided to business and citizens, and secure exchange of e-documents. When this exchange crosses the borders of closed systems or EU’s Member States several interoperability issues arise. In EU many schemes and solutions have been proposed to overcome some problems, yet there is still more to be do...

in this paper, the dual area vector of a closed dual spherical curve is kinematically generatedand the dual steineer vector of a motion are extensively studied by the methods of differential geometry.jacobi’s theorems, known for real curves, are investigated for closed dual curves. the closed trajectorysurfaces generated by an oriented line are fixed in a moving rigid body in ir3 , in which the...

As propriedades da prata são conhecidas há muitos anos. Recentemente, as nanopartículas de prata têm chamado a atenção por sua atividade antimicrobiana que oferece a possibilidade de uso com propósitos médicos e de higiene. Estas nanopartículas de prata em diferentes formulações, com diferentes formas e tamanhos, exibem atividades antimicrobianas diferentes. Entretanto, os mecanismos da ativida...

A PTIN P6lo do Porto contra o sen neg6cio no ramo das tecnologias de inform&Ao. O &mbito da sua certificaAo Dela APCER (ISO 9001) 6: "Projectos de desenvolvimento de sojrware, proJ`ectos europeus e projectos de consuLtoria no &Yea dos telecomunicaV6es. " No processo de JmpJementao do Sistema de Qualidade fol necesso encontrar uma interpretao e uma abordagem inovadoras. O SQ Sistema da Qualidade...

The treatment of condylar process fractures has generated a great deal of discussion and controversy in oral and maxillofacial trauma and there are many different methods to treat this injury. For each type of condylar fracture, the techniques must be chosen taking into consideration the presence of teeth, fracture height, patient's adaptation, patient's masticatory system, disturbance of occlu...

☆ Como citar este artigo: Korppi M. Whooping cough – still a challenge. ☆☆ Ver artigo de Ferronato AE et al. nas páginas 549-53. diagnosticadas como casos de coqueluche, e posteriormen-te transmitiram a bactéria B. pertussis aos neonatos das famílias. Durante as duas últimas décadas do século passa-do, muitos pais recusaram a vacinação contra pertussis, e a incidência de coqueluche mais uma vez...

In this paper, we introduce a new function called tri-ĝ continuous in tri-topological spaces. A map f : X → Y is if f-1(V) closed for each tri-closed set V Y. Also define, quasi tri-ĝ. perfectly tri-ĝ, contra totally and strongly maps are introduced some of their properties studied.

Assume there exists a pseudo-elliptic monoid. We wish to extend the results of [39] to meromorphic, positive, contra-everywhere open planes. We show that E = ∅. It has long been known that u < i [39]. In [39], it is shown that sF,p 6= V ′′.