This work presents a density functional theory study of the norbornene ROMP metathesis reactions. The energies have been calculated in a Grubbs catalyst model Cl2(PH3)2Ru=CH2. The geometries and energy profile are similar to the Grubbs metilydene (Cl2(PCy3)2Ru=CH2 real model. It was found that the metathesis reaction proceeds via associative mechanism (catalyst-norbonene) followed by dissociative substitution o...
Paper prepared for presentation at the 28th International Congress of Actuaries, Paris 2006 ; In this paper, we discuss the so-called paradox of ageing, with respect to the members of the age group 55-64 years of age. This generation is (currently) too young to retire, despite the length of their working lives - for some in excess of forty years - and high earnings, yet is too old to continue working, since em...
O litoral, espaço geográfico de interface entre o meio marinho e terrestre, reúne múltiplos recursos que têm vindo a ser explorados ao longo dos tempos de uma forma cada vez mais intensa. A crescente ocupação humana das áreas litorais nos últimos 50 anos é disso um claro exemplo, chamando cada vez mais a atenção de entidades e especialistas de vários domínios científicos, para a necessidade de disciplinar e ord...
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