RM - Comunicações em actas de encontros científicos internacionais
Permanent URI for this collection
Browse
Browsing RM - Comunicações em actas de encontros científicos internacionais by Issue Date
Now showing 1 - 10 of 30
Results Per Page
Sort Options
- Exposure to ionizing radiation and dangerous substances inside buildings related to construction productsPublication . Carvalho, F.P.; Paiva, J.V.; Carvalho, Jorge; Batista, Maria JoaoABSTRACT: The use of many materials of geological origin and recycled materials in the construction of buildings faces an increasing demand and stricter regulation for quality control. Construction products are requested to meet safety standards including those for radon exhalation and gamma radiation emission, amongst other dangerous substances, because if unchecked they could deteriorate the quality and safety of the indoor environment. Construction products shall pass testing for radioactivity in order to meet those standards and to maintain a high ranking position in the international markets.
- Ancient glazed ceramic tiles : a long-term, study from the remediation of environmental impacts to the non-destructive characterization of materialsPublication . Figueiredo, M. Ondina; Silva, Teresa; Veiga, JPSince the involvement in a national research project in 1995-1997 with the partnership of the National Tile Museum in Lisbon, until a recent European project with partners from Mediterranean countries which cultural patrimony entails glazed ceramic tiles, the authors have been active in the non-destructive characterization of ceramic and vitreous materials used to manufacture ancient decorated tiles (16th-19th century) through the access to the European Synchroton Research Facility (ESRF, Grenoble/France). As an input to the preservation of this important cultural patrimony through the improvement of restoration techniques, a synopsis is presented of the work so far developed.
- Abandoned mine slags analysis by EPMA WDS x-ray mappingPublication . Guimarães, Fernanda; Rosado, L.; Morais, C.; Candeias, A. E.; Pinto, A. P.; Mirao, JoseThe mining activity on the Iberian pyritic Belt (Portugal and Spain) started before Phoenician times, became particularly intense during the Roman occupation of the Iberian Peninsula (for gold) and after the industrial revolution (for gold, copper, zinc, lead and sulphur). The commonest ore of this region is a massive polymetalic sulphide accumulation, where pyrite (FeS2) is the main mineral, with variable concentrations of chalcopyrite (CuFeS2), sphalerite (ZnS), galena (PbS), arsenopyrite (FeAsS2), other sulphides and sulfosalts which include minor elements like Mn, Co, Ni, Se, Cd, Sb, Te, Hg and Bi. Some of the main and minor elements of these ores are hazardous and the drainage basins of pollutant source areas often induce health concerns in the resident population. Electron microprobe study followed previous optical and XRD analysis of the slags. The study focused on the identification of phases how sulphide and meta11ic phases are distributed within the material and infer about leachable elements during weathering. Electron microprobe X-Ray maps show evidences of different behavior between the elements: Ca and Zn are completely leached; iron is retained in oxyhydroxides, lead and arsenic precipitate as sulphates. Electron microprobe studies are essential to understand complex materials as earth materials. Nevertheless, care is required to a correct interpretation of data and most quantitative compositional data are not trustworthy.
- High-tech element availability for sustainable energy systems in the 21st century : The Iberian Pyrite Belt as a potential supplierPublication . Reiser, Fiona K. M.; Rodrigues, Carlos; de Oliveira, Daniel Pipa Soares; Rosa, DiogoThis work provides estimations on the future raw material demand for the thin-film photovoltaic (PV) elements indium, selenium, tellurium, germanium and gallium. Data calculation has been carried out on the basis of current energy and PV market outlooks. For indium, our calculation yields a maximum cumulative demand of 12 kilotons for the period from 2008 to 2030. The minimum demand for the same period is of 8 kilotons. Additionally, static depletion times for the elements in question have been determined. For indium, the static depletion time of 22 years shows that its supply is highly endangered, particularly if indium consumption for LCD and solar panel production stays on a high level or even increases. The situation for selenium, with a static depletion time of 53 years, is not much better. Therefore, in addition to recycling, the fundamental way to enhance material supply is through intensified exploration for mineral deposits. Such exploration could focus in promising areas, where high-technology elements are already known to exist in sulphide ore deposits, e.g. the Iberian Pyrite Belt (IPB), a metallogenic province known for its massive sulphide ore resources.
- The Bragança Podiform Chromite Field in NE PortugalPublication . de Oliveira, Daniel Pipa Soares; Santana, Helena; Pinto de Meireles, Carlos Augusto; Guimarães, Fernanda
- Blue pigments in XVI-XVII century glazes : a comparative study between portuguese faiences and contemporary chinese porcelains manufactured for portuguese marketPublication . Figueiredo, M. Ondina; Silva, Teresa; Veiga, JP; Prudêncio, M. Isabel; Dias, M. Isabel; Matos, Maria Antónia; Pais, Alexandre Manuel
- Chemical elements variation in leaves with different development stages of Cistus plants from S. Domingos mine area, South PortugalPublication . Batista, Maria Joao; Gonzalez-Fernandez, Oscar; Abreu, Maria Manuela; Carvalho, L.Soils and leaves of Cistus ladanifer L. and Cistus salviifolius L. in different stages of development (young and mature) were sampled in different sites of the S. Domingos mine. The soils are thin and were developed on heterogeneous materials of metallurgical slags, gossanous materials and weathered host rocks. In general, mature leaves have higher concentrations of As, Cu, Fe, Mn, Pb and Zn than young leaves. Nevertheless, in Moitinhos site the young leaves have higher concentrations of As, Cu and Mn than mature leaves. Near the mining buildings C. ladanifer leaves have higher concentrations of As in mature leaves than C. salviifolius. The Pb concentrations in mature leaves are significantly higher and C. ladanifer contain two fold more than C. salviifolius leaves. Cistus plants show different behaviour on the trace elements uptake and translocation. This knowledge is useful in order to implement remediation programs in mine areas of the Mediterranean region using these pioneer plants.
- Blue pigments in XVI-XVII century glazes : a comparative study between portuguese faiences and chinese porcelainsPublication . Figueiredo, M. Ondina; Silva, Teresa; Veiga, JP; Prudêncio, Maria Isabel; Dias, Maria Isabel; Matos, M. A.; Pais, A. M.
- Geoquímica urbana na cidade de Lisboa : controle de dados climatológicos na dispersão de poeiras contaminadasPublication . Bartolomeu, A. S.; Reis, A. P.; Patinha, Carla; Dias, A.; Cachada, A.; Prazeres, Cátia; Sousa, A. J.; Silva, E. Ferreira da; Batista, Maria Joao
- URBSOIL-LISBON-Geoquímica dos solos urbanos de Lisboa: caracterização e cartografia, suporte para futuros estudos de saúde humana: resultados preliminaresPublication . Prazeres, Cátia; Batista, Maria Joao; Patinha, Carla; Reis, A. P.; Dias, A. C.; Cachada, A.; Silva, E. Ferreira da; Sousa, A. J.; Figueira, R.; Sérgio, C.A Geologia, e em especial a Geoquímica em ambiente urbano, têm-se revelado ferramentas essenciais não só no estudo dos materiais naturais neste ambiente, como na ligação entre a Geologia e a acção antrópica. Este estudo, com uma metodologia que usa vários meios de amostragem, pretende avaliar quais os elementos químicos que podem intervir num contexto de interacção em que as crianças são tomadas como alvo principal. Os primeiros resultados sobre concentrações de elementos químicos para os solos urbanos de Lisboa apontam para uma exposição esparsa na cidade de alguns dos elementos químicos inorgânicos, mas havendo por vezes um zonamento por tipologia de local ou de elemento químico. Foram definidos quatro grupos de pontos de amostragem consoante o tipo de uso, e escolhidos para uma análise mais próxima alguns elementos considerados tendencialmente de input antrópico e que se relacionam com a saúde humana.
- «
- 1 (current)
- 2
- 3
- »