Browsing by Issue Date, starting with "2009-07"
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- Contribution of Cistus ladanifer L. to natural attenuation of Cu and Zn in some mine areas of the Iberian Pyrite BeltPublication . Batista, Maria Joao; Abreu, Maria ManuelaThe comparison between four groups of soils and rock plants (Cistus ladanifer L.) developed on these soils was made using three mine areas of different ages (Neves Corvo, Brancanes, Monte dos Mestres) and a control area (Lombador). Copper and zinc soil-plant realtionship was different in Neves Corvo, ongoing axploitation of copper and zinc, when compared with the control area of Lombador reflecting the actual influence of the present exploitation. The rock rose plants seem to have contributed to the natural attenuation of Cu in soils of Brancanes area where mining stopped more then a century ago.
- Organic resins functionalized with chiral salen complexes as heterogeneous catalysts for the strecker reactionPublication . Esteves, M. Alexandra; Santos, Célia; Guerreiro, A. Margarida; Baleizão, Carlos
- Characterization of smart MARFOS NiTi shape memory alloysPublication . Neves, Filipe; Fernandes, F. M. Braz; Martins, J.; Correia, J.B.; Oliveira, M.; Gaffet, E.; Wang, T. Y.; Lattemann, M.; Suffner, J.; Hahn, H.In the present study, structural characterization of NiTi smart shape memory al-loys (SMAs), produced by an alternative powder metallurgy approach named mechanically ac-tivated reactive forging (MARFOS), was carried out by means of transmission electron micros-copy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was observed that MARFOS materials had a multiphase nanocrystalline structure. In addition, the transformation behaviour associated with the shape memory effect of the MARFOS aged mate-rials was studied with differential scanning calorimetry (DSC). Multiple-step martensitic trans-formations could be observed in aged materials.