11 documents found, page 1 of 2
Microplastic contamination of lettuces grown in urban vegetable gardens in Lisb...
Canha, Nuno; Jafarova, Mehriban; Grifoni, Lisa; Gamelas ou Carla A. Gamelas, Carla; Alves, Luís C.; Almeida, Susana Marta; Loppi, StefanoUrban vegetable gardens are very often a feature of cities that want to offer their citizens a more sustainable lifestyle by producing their own food products. However, cities can have significant pollution levels (or pollution hotspots) due to specific sources of pollution, such as traffic. Among the various pollutants, microplastics (MPs) are emerging as a consensual concern due to the awareness of the enviro...
Chalcolithic copper production and use in the western end of the Iberian Penins...
Valério, Pedro; Soares, Joaquina; Alves, Luís C.; Silva, Rui J.C.; Araújo, Maria de Fátima; Silva, Carlos Tavres daRecent archaeological excavations identified a prehistoric occupation at Castro de Chibanes (Setúbal Peninsula, Portugal) displaying ceramic crucibles and metal artefacts in stratigraphic levels assigned to 2500–1900 cal BC. Apart from basic tools such as flat axes and awls, the collection includes ceramic crucibles, with emphasis to an uncommon example with a pouring lip and four feet. The studied set was comp...
In-depth inhomogeneities in CIGS solar cells: identifying regions for performan...
Corregidor, Victoria; Barreiros, M. Alexandra; Salomé, Pedro M. P.; Alves, Luís C.When considering materials to be used as active layers in solar cells, an important required parameter is the proper knowledge of their elemental composition. It should be heavily controlled during growth in order to obtain the desired bandgap and to decrease recombination defects and then increase the solar cell electrical performance. Ion beam analytical techniques and, in particular particle-induced X-ray em...
Early Iron Age copper-based funerary items from southern Portugal
Valério, Pedro; Araújo, Maria Fátima; Soares, António Monge; Alves, Luís C.; Soares, Rui; Melo, Linda; Baptista, LídiaThe recently excavated necropolises of Esfola (Beja) and Monte do Bolor 1/2 (Beja) display a characteristic architecture and distinctive funerary items that refer to the seventh to sixth century BC. The work comprises a microanalytical study of copper-based artefacts, some of them symbols of status, recovered in these necropolises (Tartesic belt buckles, body grooming instruments and different types of fibulae,...
Castanea sativa shells and fruits: Compositional analysis by proton induced X-r...
Corregidor, Victoria; Antonio, Amilcar L.; Alves, Luís C.; Cabo Verde, SandraChestnut fruits, from Castanea sativa Miller species, have been previously characterized mainly to study the nutritional and biochemical parameters, with mineral contents receiving less attention from the researchers, although these minerals are essential for several mechanisms in human body. In this study, a detailed elemental compositional analysis was performed using Proton Induced X-ray Emission (PIXE) to c...
Caracterização química, física e mineralógica da colecção de azulejos hispano-m...
Leal, Ana Sofia; Alves, Luís C.; Coentro, Susana; Pereira, Sílvia; Relvas, Cátia; Ferreira, Teresa; Mirão, José; Fernandes, LídiaNeste trabalho estuda-se um conjunto de fragmentos de azulejos hispano-mouriscos do espólio do Museu de Lisboa - Teatro Romano. Apresenta-se a caracterização química e morfológica dos vidrados e do corpo cerâmico e a caracterização mineralógica deste último. Os vidrados são plúmbicos, sendo que os de cor branca e azul devem a sua opacidade a SnO2 (4-11 %). As restantes cores apresentam teores de SnO2 inferiores...
Caracterização química, física e mineralógica da colecção de azulejos hispano-m...
Leal, Ana Sofia; Alves, Luís C.; Coentro, Susana; Pereira, Sílvia; Relvas, Cátia; Ferreira, Teresa; Mirão, José; Fernandes, LídiaThis work intends to study a set of Hispano-Moresque tile fragments from the Lisbon Roman Theatre Museum collection. The chemical and morphological characterization of the glazes and the ceramic body was presented and also the mineralogical characterization of the latter. The glazes are plumbic, being the opacity of the white and blue colors due to SnO2 (4-11 %). The other colors present amounts of SnO2 lower t...
A Física aplicada à qualidade alimentar: identificação de metais por “pixe” em ...
Antonio, Amilcar L.; Corregidor, Victoria; Alves, Luís C.; Santos, Pedro M.P.; Teubig, Pamela; Galaviz, Daniel; Cabo Verde, SandraA concentração na castanha de minerais como o cálcio, potássio, o magnésio e outros tem sido estudada tradicionalmente por absorção atómica ou por espectrofotometria de UV-VIS [1-2]. Neste trabalho foi estudada a composição elementar de duas variedades (Longal e Judia) de castanha europeia (Castanea sativa Mill.) com a técnica PIXE (Proton Induced X-ray Emission). Os resultados preliminares mostram que a compos...
Heavy elements in chestnuts
Corregidor, Victoria; Alves, Luís C.; Santos, Pedro M.P.; Teubig, Pamela; Galaviz, Daniel; Antonio, Amilcar L.; Cabo Verde, SandraChestnut fruit (CasChestnuts, Castanea sativa, heavy elements, PIXEtanea sativa Miller) are an important food resource in several countries. Portugal is the third largest European producer, with an average production of 25 thousand tons [1], being mainly produced in the North region of Trás-os-Montes. Earlier studies on chestnuts elemental composition were performed by atomic absorption to detect Ca, Mg, Na, K,...
Cistercian Pavements from Santa Maria de Alcobaça Abbey: first examples of tin-...
Carvalho, Fernanda; Trindade, Rui; Relvas, Cátia; Ferreira, Teresa; Alves, Luís C.; Silva, Rui M.C.; Mirão, José; Coentro, Susana; Muralha, Vânia S.F.The Mosteiro de Alcobaça (Alcobaça Monastery, founded in 1153) was built to the image of Clairvaux Abbey, founded by the Cistercian abbot St. Bernard. In many ways Alcobaça mirrored the original concepts of the Cistercian Order, with an austere architectural style and shedding signs of richness. The glazed tiles found on the pavement of the deambulatory and some adjacent chapels are some of the first examples o...