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Soil nitrogen availability in olive orchards after mulching legume cover crop r...

A natural source of nitrogen (N) is needed to increase soil fertility in traditional olive orchards and to maintain the N nutritional status of olive trees. With this aim, we studied the introduction of legume cover crops in two olive orchards, which were converted into mulches and left on the ground as phytomass after they had been cut. The experiments were carried out in Suçães and Qta do Carrascal, NE Portug...

Implementation of an Active Mass Damper to Control Vibrations in a "Lively" Foo...

Analises de mel e propolis utilizando metodos quimiometricos de classificação e...

This research work describes four studies of chemometrical methods employed for the characterisation of honey and propolis. In the first study honey quality parameters, that is, acidity, humidity, and reducing sugars, were measured with the aid of mid-infrared spectroscopy by attenuated total reflectance and partial least squares multivariate calibration. The obtained results show the viability of the employed ...

Análise comparativa entre o jogador líbero e os recebedores prioritários na org...

Estudo da energética de acilcalcogenoureias e de acilcalcogenoureatos metálicos

Nesta dissertação apresenta-se o estudo termoquímico de acilcalcogenoureias e respectivos complexos de níquel (II), cobre (II), zinco (II) e chumbo (II). O trabalho descrito constitui uma contribuição para o estudo da energética de ligações metal-ligando em complexos metálicos e, em particular, das ligações metal-oxigénio e metal-enxofre. Para a prossecução destes objectivos, nomeadamente a determinação de valo...

Active control of vibrations in pedestrian bridges

This paper, apart from making a brief general reference to vibration problems in pedestrian bridges, as well as to the form of modelling of dynamic pedestrian loads, presents the use of a predictive control strategy for the numerical simulation of the dynamic response of actively controlled structures of this type. The consideration of this control strategy permitted the development of a computational model, wh...