59 documents found, page 1 of 6
Mineralogical and chemical changes induced by experiments of interaction betwee...
Moita, P,; Berrezueta, E.; Abdoulghafour, H.; Beltrame, M.; Mirão, J.; Ribeiro, C.; Barrulas, P.; Pedro, J.; Carneiro, J.The focus of this research is a qualitative study of mineralogical and chemical changes in plutonic mafic rock samples after exposure to a CO2-rich brine, under supercritical conditions (SC), to clarify the behavior of brine and rock in the initial stages of mineral carbonation. The studied rock consists of a gabbro-anorthosite from the Odivelas massif, in southern Portugal. The sample was exposed to a SC CO2-r...
A multi-analytical characterization of 14th-18th century pottery from the Kongo...
Tsoupras, A.; Clist, B.; Lopes, M.C.; Moita, P.; Barrulas, P.; Jesus, M.; Domingos, S.; Bostoen, K.; Mirão, J.Pottery traditions refect the socioeconomic framework of past cultures, while the spatial distribution of pottery indicates exchange patterns and interaction processes. Material and earth sciences are employed here to determine raw material sourcing, selection and processing. The Kongo kingdom, internationally renowned since the late ffteenth century, is one of the most famous precolonial states in Central Afri...
Ancient restoration and production technologies of Roman mortars from monuments...
Sitzia, F.; Beltrame, M.; Columbu, S.; Lisci, C.; Miguel, C.; Mirão, J.This paper focuses on the study of different Roman mortars (renders, finishing coats), used in the construction and restoration of the Forum Traiani thermal baths (Central Sardinia, Italy), a significant example of the Roman-style architecture in Sardinia. The archaeological site is located in a high hydrogeological risk area, due to the cyclical flooding of nearby Tirso river. Moreover, the presence of thermal...
The Use of Gold at the Rock-cut Tomb Necropolis of Casal do Pardo (Quinta do An...
Gonçalves, V.S.; Sousa, A.C.; Santos, M.; Bottaini, C.; Mirão, J.Thanks to extensive research on the site and its architecture, and remains, Casal do Pardo is a type site for European prehistory, a true archetype of European Bell Beaker culture. Although there are many topics related to Casal do Pardo, this paper focuses exclusively on gold metallurgy and the recent findings of a 2017 archaeological campaign.The group of rock-cut caves at Casal do Pardo is located in the par...
The metallic artifacts of the prehistoric fortified settlement of Leceia (Oeira...
Cardoso, João Luís; Bottaini, C.; Mirão, J.; Silva, R. J.; Bordalo, R.This paper presents the results of a study carried on a collection of 144 metal artefacts from the Early (ca. 2800-2600/2500 a.C.) and the Middle/Final Chalcolithic (ca. 2600/2500-2000 a.C.), found at the site of Leceia (Oeiras, Central Portugal) during the excavations conducted between 1983 and 2000. A systematised analysis of the collection was provided in order to enumerate the different typologies found in ...
White on blue: A study on underglaze-decorated ceramic tiles from 15th-16th-cen...
Coentro, S.; Alves, L.C.; Coll Conesa, J.; Ferreira, T.; Mirão, J.; Silva, R.C.; Trindade, R.; Muralha, V.S.F.This study characterises and compares tin-opacified underglaze-decorated tiles from Valencian and Sevillian provenances. This technique, where the cobalt and manganese pigments are applied below an opaque white glaze, was used in the Iberian Peninsula between the 14th and early 16th centuries. The chemical and morphological characterisation of the glazes was performed by Optical Microscopy (OM), Scanning Electr...
Biodeterioration of majolica tiles by the fungus Devriesia imbrexigena
Coutinho, M.L.; Miller, A.Z.; Phillips, A.; Mirão, J.; Dias, L.; Rogerio-Candelera, M.A.; Saiz-Jimenez, C.; Martin-Sanchez, P.M.; Cerqueira-Alves, L.This study aimed at evaluating the influence of ageing on the bioreceptivity and biodeterioration of glazed tiles by fungi. These microorganisms have been identified in historical tile colonizing microbial communities. A 12-month laboratory colonization experiment was conducted using pristine and artificially aged tile models inoculated with Devriesia imbrexigena. Fungal growth was evaluated by digital image an...
Experiments on mineral carbonation of CO2 in gabbro’s from the Sines massif– pr...
Moita, P.; Berrezueta, E.; Pedro, J.; Miguel, C.; Beltrame, M.; Galacho, Cristina; Barrulas, Pedro; Mirão, J.; Carneiro, J.Portugal has committed to achieve carbon neutrality by 2050, but the current profile of emissions from the industrial sector requires that CO2 capture and storage technologies are deployed to accomplish that target. Amongst those technologies, mineral carbonation, i.e. the ability to precipitate carbonates by reacting the main cations present in silicates in mafic rocks (e.g. Ca2+, Fe2+) with CO2, turns these r...
Site screening for in situ mineral carbonation options in southern Portugal.
Carneiro, J.; Araújo, A.; Moita, P.; Pedro, J.; Sousa, P.; Beltrame, M.; Berrezueta, E.; Chambel, A.; Correia, A.; Galacho, Cristina; Marques, L.F.The Sines industrial area is the largest CO2 emitting cluster in Portugal, with a coal power plant, a refinery and petrochemical facilities that can be responsible for almost a third of the national emissions from stationary sources. This cluster is seen as an early opportunity to deploy CO2 Capture and Storage (CCS) in Portugal, but the nearby offshore sedimentary formations do not provide economic conditions ...
O espólio metálico do povoado pré-histórico de Leceia (Oeiras): inventariação e...
Cardoso, J. L.; Bottaini, C.; Mirão, J.; Silva, R. J.; Bordalo, R.This paper presents the results of a study carried on a collection of 144 metal artefacts from the Early (ca. 2800-2600/2500 a.C.) and the Middle/Final Chalcolithic (ca. 2600/2500-2000 a.C.), found at the site of Leceia (Oeiras, Central Portugal) during the excavations conducted between 1983 and 2000. A systematised analysis of the collection was provided in order to enumerate the different typologies found in ...