55 documents found, page 1 of 6
Dating recent tidal marsh sediments using windborne giant particles of green pe...
Moreno, J; Leorri, E; Fatela, F; Freitas, MC; Moreno, F; Mirão, J; Dias, L; Leira, M; Masqué, P; Russo, A; Cunha, A; Inácio, M; Blake, WHCoastal systems are especially vulnerable to human activities resulting from a range of direct physical modifications of the ecosystems to the biological, chemical, and physical impacts of pollutants. For the most recent decades, these modifications can be accurately tracked by industrial development indicators, providing an exceptional record of historical changes. In return, when such changes are identified i...
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmat...
Font, E; Duarte, L; Dekkers, M; Remazeilles, C; Egli, R; Spangenberg, J; Fantasia, A; Ribeiro, J; Gomes, E; Mirão, J; AdatteT, TLarge-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane hydrate dissociation, volcanogenic outgassing of carbon dioxide and/or thermogenic methane release from the Karoo‐Ferrar magmatic province (southern Africa). Distinct small-scale shifts superimposed on the long-ter...
Vernacular Caramel´s Adobe Masonry Dwellings–Material Characterization
Silva, A; Oliveira, I; Silva, V; Mirão, J; Faria, PIn Pinhal Novo, Palmela, and neighboring municipalities, southern Lisbon region, there are a great number of small adobe masonry dwellings, made in the first half of the twentieth century. The vernacular dwellings were constructed by families that came from the north/center region of Portugal to work at the local manors and were called Caramel´s. Adobe samples from three of these dwellings were collected in Pin...
Synthesis of yellow and red ochre: a preliminary multi-analytical, micro-invasi...
Botticelli, M; Appolloni, G; Candeias, A; Mirão, J; Maras, AThis research aims to underline distinctive features to detect synthetic ochres on paintings, being the use of synthetic red widespread and well documented since Prehistory, while synthetic Mars yellow has been commercialized since the eighteenth century. Mars yellow was synthesized from Fe(NO3)3 and KOH reaction, according to ancient recipes. Hematite was synthesized by heating Mars yellow and other natural ye...
20th-century award-winning buildings in Lisbon (Portugal). study of plasters, r...
Almeida, L; Silva, AS; Veiga, M; Mirão, J; Vieira, MConservation, increasing the useful life period of existing significant buildings with minimum consumption of new materials, as much as possible of low-embodied energy, is an important step towards sustainable rehabilitation, while also contributing to the preservation of the cultural heritage. In the context of 20th-century buildings’ conservation, the knowledge of construction techniques and applied materials...
Analysis of portable rock art from Foz do Medal (Northwest Iberia): Magdalenian...
Soares de Figueiredo, S; Botica, N; Bueno Ramirez, P; Tsoupra, A; Mirão, JStudies focusing on Palaeolithic portable rock art have a long tradition in Europe. Nevertheless, they tend to only focus over formal and stylistic criteria of the motifs, important as they provide chronologies for cave art. This article proposes a multiple approach to a sample of 25 engraved plaques of the Foz do Medal archaeological site, where horses and aurochs were depicted, in order to construct a prelimi...
Application of a handheld Raman spectrometer for the screening of colored secon...
Košek, F; Culka, A; Fornasini, L; Vandenabeele, P; Rousaki, A; Mirão, J; Bersani, D; Candeias, A; Jehlička, JThe São Domingos area (Corte do Pinto, Portugal) represents a large sulfide ore deposit in the Iberian Pyrite Belt that was mined primarily for copper and sulfur in the past. Currently, the deserted mine and mine wastes are the reason for the production of acid mining drainage releasing potentially harmful elements. Because metastable secondary sulfates may temporary sink toxic pollutants, the in situ monitorin...
Physical and Mechanical Properties of Reinforced Concrete from 20th-Century Arc...
Almeida, L; Silva, AS; Veiga, M; Vieira, M; Mirão, Jhe use of concrete materials in Portugal, namely reinforced concrete, began in the 19th century. However, during the 20th century, the increase in the application of this composite material, alongside the use of hydraulic binders, led to a disruption of traditional construction techniques and enhanced generalized application in concrete structures, combining aesthetics with functionality. In this paper, the aut...
Recording of Weathering Profile Development by Uranyl-Phosphate Minerals
Gonçalves, M; Pinto, A; Mirão, JRecording of Weathering Profile Development by Uranyl-Phosphate Minerals
Revestimentos de edifícios do séc. XX premiados com o Prémio Valmor de Arquitet...
Almeida, L; Silva, AS; Veiga, M; Mirão, JRevestimentos de edifícios do séc. XX premiados com o Prémio Valmor de Arquitetura.aracterização e Diagnóstico com vista à sua conservação