22 documents found, page 1 of 3
Evaluation of portable Raman spectroscopy and handheld X-ray fluorescence analy...
Lauwers, D.; Candeias, A.; Coccato, A.; Mirao, J.; Moens, L.; Vandenabeele, P.In archaeometry, the advantages of a combined use of Raman spectroscopy and X-ray fluorescence spectroscopy are extensively discussed for applications such as the analysis of paintings, manuscripts, pottery, etc. Here, we demonstrate for the first time the advantage of using both techniques for analysing glyptics. These engraved gemstones or glass materials were originally used as stamps, to identify the owner,...
An integrated approach for assessing the bioreceptivity of glazed tiles to phot...
Coutinho, M. L.; Miller, A. Z.; Martin-Sanchez, P. M.; Mirao, J.; Gomez-Bolea, A.; Machado-Moreira, B.; Cerqueira-Alves, L.; Jurado, V.A laboratory-based methodology was designed to assess the bioreceptivity of glazed tiles. The experimental set-up consisted of multiple steps: manufacturing of pristine and artificially aged glazed tiles, enrichment of phototrophic microorganisms, inoculation of phototrophs on glazed tiles, incubation under optimal conditions and quantification of biomass. In addition, tile intrinsic properties were assessed to...
LA-ICP-MS, Uma ferramenta poderosa e versátil em ciência - abordagens e aplicaç...
Barrulas, Pedro; Maurer, A.-F.; Konstantinova, N.; Madureira, P.; Ribeiro, C.; Pisonero, J.; Barrocas Dias, C.; Candeias, A.; Mirao, J.O Laboratório HERCULES, centro de investigação que visa o estudo do património e da herança cultural, é o único laboratório nacional equipado com um ICP-MS acoplado a um sistema de ablação a laser. Equipados com este sistema, é permitido aos investigadores do Laboratório HERCULES abraçar projetos inovadores e nunca antes possíveis em Portugal. Capaz de determinar concentrações elementares de elementos-traço com...
A Multidisciplinary Approach to the Study of Archaeological Mortars from the To...
Cardoso, I.; Macedo, M. F.; Vermeulen, F.; Corsi, C.; Santos Silva, A.; Rosado, L.; Candeias, A.; Mirao, J.he Roman town of Ammaia (in Marvão Region) is considered one of the most important recent findings of the Roman presence in Portuguese territory. It was settled in Republican times and abandoned in the seventh century. In this research, 17 masonry mortars and renders from the West Tower (South Gate), the residential area near the West Tower, the macellum, the peristylium, the public bath building, the podium of...
Magnetic fingerprint of Southern Portuguese speleothems and implications for pa...
Font, E.; Veiga-Pires, C.; Carvallo, C.; Pozo, M.; Neto, A.; Camps, P.; Fabre, S.; Mirao, J.Environmental magnetism of speleothems is still in its early stage of development. Here we report on our investigation of the environmental and paleomagnetic information that has been recorded in speleothems, and what are the factors that control its preservation and reliability. To address these issues, we used a multidisciplinary approach, including rock magnetism, petrography, scanning electron microscopy, s...
Atmospheric halogen and acid rains during the main phase of Deccan eruptions: M...
Font, E.; Fabre, S.; Nédélec, A.; Adatte, T.; Keller, G.; Veiga-Pires, C.; Ponte, J.; Mirao, J.; Khozyem, H.; Spangenberg, J.Environmental changes linked to Deccan volcanism are still poorly known. A major limitation resides in the paucity of direct Deccan volcanism markers and in the geologically short interval where both impact and volcanism occurred, making it hard to evaluate their contributions to the mass extinction. We investigated the low-magnetic-susceptibility interval just below the iridium-rich layer of the Bidart (France...
Microanalytical study of the fresco ‘the good and the bad judge’ in the medieva...
Gil, M.; Araujo, C.; Carvalho, M.L.; Longelin, S.; Dias, L.; Valadas, S.; Souto, C.; Frade, J.; Ribeiro, I.; Mirao, J.; Candeias, A.This article describes a study carried out on the emblematic mural painting so-called ‘fresco of the good and bad judge’ located at the medieval village of Monsaraz (southern Portugal). This painting, with two distintic narratives, is thematically unique in Portugal and rare in the context of European Renaissance art. Scientific research was undertaken to clarify doubts about the chronology of the two painted s...
Colour Assays: An Inside Look into Alentejo Traditional Limewash Paintings and ...
Gil, M.; Aguiar, J.; Seruya, A.; Veiga, R.; Carvalho, L.; Vargas, H.; Mirao, J.; Candeias, A.A series of colour assays were conducted taking into account old bibliographic recommendations and oral testimony regarding traditional lime painting technology from the Alentejo (South Portugal) region. The main objectives were: (a) the colorimetric analysis of paintings made with different limewash preparation methods; (b)the comparison between natural processed red and yellows ochre pigments (‘‘home made’’ a...
A new sedimentary benchmark for the Deccan Traps volcanism?
Font, E.; Nedelec, A.; Ellwood, B.; Mirao, J.; Silva, P.The origin of the Cretaceous-Paleogene boundary (KPB) mass extinction is still the center of acrimonious debates by opposing partisans of the bolide impact theory to those who favored a terrestrial origin linked to the Deccan Traps volcanism. Here we apply an original and high-resolution environmental magnetic study of the reference Bidart section, France. Our results show that the KPB is identified by an abrup...
Limewashing paintings in Alentejo urban heritage: pigment characterization and ...
Gil, M.; Carvalho, M.L.; Seruya, A.; Queralt, I.; Candeias, A.E.; Mirao, J.Pigments used in traditional limewashing paintings in Alentejo urban Heritage are inorganic materials and can be grouped into four categories: a) reds – red ochre (from terras rossas, red schists and iron ore deposits weathering), almagres,terra roxa (natural processed red ochres) and synthetic red iron oxides; b) yellows – yellow ochre (from schists and iron ore deposits), processed natural ochres, yellow iron...