This article presents a study about systems that use multiple antennas to transmit and receive information (MIMO systems). This type of system allows in the transmitter and in the receiver, spatial diversity or beamforming, and in environments with large number of independent multipath components, achieves a transmission capacity higher than any other system based on arrays of conventional antennas.The performa...
This article presents an analysis of a set of experimental measurements acquired with a mobile broadband radio system prototype developed in the SAMBA (System for Advanced Mobile Broadband Applications) project framework. First, a brief descritption of the SAMBA trial platform used in the measurement campaign is presented. Then, measurements collected in an urban environment a...
This work deals with mobile broadband radio communications. It focuses on the construction of a tool to process the field trial results acquired with a prototype of a mobile broadband radio system developed and implemented in the SAMBA project. This tool was built to process, as automatic as possible, the huge amount of data collected during the field trials. The most relevant para...
O presente trabalho apresenta dados de um estudo realizado com 127 professores de uma escola secundária do Distrito do Porto, onde se avaliaram vários indicadores relacionados com o trabalho e o bem-estar pessoal (stresse, “burnout”, saúde física e satisfação profissional). Os resultados revelaram valores muito significativos de stresse ocupacional (percentagens acima dos 30%), uma prevalência de esgotamento de...
Cellulose-binding domains (CBD) are modular peptides, present in many glycanases, which anchor these enzymes to the substrate. In this work, the effect of CBD adsorption on the surface properties of a model cellulose, Whatman CF11, was studied. The methods applied include inverse gas chromatography (IGC), ESCA, X-ray diffraction, and scanning electron microscopy (SEM). The CBD partition affinity (0.85 L/g) was ...
Com o objetivo de comparar variáveis epidemiológicas na toxoplasmose em ovinos e caprinos, amostras de soro de animais de propriedades localizadas em duas regiões do Estado de Pernambuco, Brasil, foram testadas pela reação de imunofluorescência indireta (RIFI) para detecção de anticorpos anti-Toxoplasma gondii. Dos 173 soros ovinos testados, em 35,3% foram encontrados resultados positivos, enquanto 40,4% dos 21...
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