A cefaleia é um sintoma frequente em Pediatria, causado por múltiplas patologias. A hipotensão intracraniana espontânea (HIE) caracteriza-se essencialmente por cefaleia em ortostatismo. Apresenta-se o caso de uma adolescente de 16 anos, com síndrome de Marfan, que recorreu à urgência por cefaleia ortostática, náusea e alterações auditivas. O exame físico, à excepção do fenótipo marfanóide, não revelou alteraçõe...
O estado de mal epiléptico constitui a mais frequente emergência neurológica em idade pediátrica. A cascata de alterações fisiopatológicas desencadeada por uma convulsão prolongada pode conduzir a uma perda da autorregulação da circulação cerebral e lesões neurológicas irreversíveis. Os objectivos do tratamento do estado de mal são a ressuscitação, tratamento da causa primária e administração de anticonvulsivan...
The attractive characteristics of carbon fibre reinforced plastics had widespread their use. In order to join different components, drilling is often necessary. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, three combinations of the drilling process are compared: tool diameter, tool geometry and feed rate. The parameters studied were...
The main purpose of the current paper is to evaluate the contribution of knowledge - intensive service activities (KISA) as a key driver for innovation and entrepreneurship in the context of a cluster approach for the economy of the sea in Algarve. We intend to analyse the central role played by these interaction processes on the generation of learning organizations and on inducing cross fertilization phenomena...
Nowadays the clock recovery circuits used for frequencies up to 10 Gbit/s use open-loop structures. The band-pass filters used on these structures are implemented with dielectric resonators (DR). This kind of filters introduce spurious modes that degradate the characteristics of the recovered clock signal. So, the clock amplification stage is required not only to provide the desired clock signal levels, but als...
In this article is investigated an optical single sideband transmission system at 10 Gbit/s with electrical equalization, using the zero forcing criteria, to compensate the chromatic dispersion. The optical transmission of single sideband signals increases the transmission distances relative to the transmission in double sideband (DSB) form.Simulation results also showed that using this...
The interest in single sideband modulation for transmission of digital data along optical fibers is growing, since it allows an improvement on the signal spectral efficiency and a reduction on the distortion produced by the fiber chromatic dispersion.In the optical single sideband transmitter the influence of the Hilbert filter configuration and the modulation depth were analysed i...
We examine corporate restructuring following privatization using uncommonly rich data on the population of Portuguese firms from 1991-2009. We find that privatization leads to sizable job losses, refl ecting reductions in both the number of establishments and in the number of workers per establishment. We find no robust evidence of impacts on the structure of the workforce. The estimated job losses following...
Dissertation presentée pour obtenir le grade de Docteur-Ingénieur, à l'Institut Superieur des Materiaux et de la Construction Mécanique
O objetivo deste trabalho é salientar uma alternativa eficaz no tratamento da ruptura dos ligamentos cruzados cranial e caudal de cães, sem associação de imobilização externa. Foram atendidos seis animais portadores de ruptura de ambos os ligamentos cruzados. Optou-se pela correção cirúrgica intracapsular, utilizando-se dois implantes sintéticos de polipropileno, para a estabilização da articulação. Os paciente...
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