22 documents found, page 1 of 3
On the biodiversity and biodeteriogenic activity of microbial communities prese...
Caldeira, A; Schiavon, N; Salvador, Cátia; Mirao, J; Candeias, AHypogenic caves represent unique environments for the development of specific microbial communities that need to be studied. Caves with rock art pose an additional challenge due to the fragility of the paintings and engravings and to microbial colonization which may induce chemical, mechanical and aesthetic alterations. Therefore, it is essential to understand the communities that thrive in these environments a...
On the biodiversity and biodeteriogenic activity of microbial communities prese...
Caldeira, A Teresa; Schiavon, N; Mauran, G; Salvador, Cátia; Rosado, T; Mirao, J; Candeias, AHypogenic caves represent unique environments for the development of specific microbial communities that need to be studied. Caves with rock art pose an additional challenge due to the fragility of the paintings and engravings and to microbial colonization which may induce chemical, mechanical and aesthetic alterations. Therefore, it is essential to understand the communities that thrive in these environments a...
Use of Monte Carlo Simulation as a Tool for the Nondestructive Energy Dispersiv...
Bottaini, C; Brunetti, A; Montero-Ruiz, I; Valera, A; Candeias, A; Mirao, JThis work is part of a broader research line that aims to develop and implement a nondestructive methodology for the chemical characterization of archaeological metals based on a protocol that combines energy dispersive X-ray fluorescence spectrometry (ED-XRF) with a Monte Carlo (MC) simulation algorithm. In this paper, the ED-XRF-MC protocol has been applied to estimate the chemical composition of a selected g...
Analytical characterization of the palette and painting techniques of Jorge Afo...
Antunes, V; Candeias, A; Mirao, J; Carvalho, ML; Dias, CB; Manhita, A; Cardoso, A; Francisco, M; Lauw, A; Manso, MIn this work, a study on a set of paintings from the most significant altarpiece assigned to Master Jorge Afonso (c. 1470–1540) painting workshop is presented. This altarpiece is composed by fourteen paintings made to the church of Convento de Jesus, in Setúbal, Portugal, and was made circa 1517–19/1530, according to art-history. This set of paintings is compared to one of the other most important Portuguese al...
Micro-Raman spectroscopy and complementary techniques (hXRF, VP-SEM-EDS, μ-FTIR...
Coccato, A; Costa, Mafalda; Rousaki, A; Clist, B; Karklins, K; Bostoen, K; Manhita, A; Cardoso, A; Dias, CB; Candeias, A; Moens, L; Mirao, JIn the framework of the inter-disciplinary KongoKing project, a set of beads from archaeological excavations in the Democratic Republic of the Congo was analysed by means of a minimally invasive, multi-analytical approach based on micro-Raman spectroscopy. The full characterization of the materials, including glassy network, opacifiers and colorizers, was achieved thanks to the combination of data from handheld...
Archaeometric contribution to the interpretation of the Late Bronze Age "hoard"...
Bottaini, C; Vilaça, R; Montero-Ruiz, I; Mirao, J; Candeias, AThis paper presents and discusses the results of the multi-analytical study carried out on a group of 39 Late Bronze Age artefacts from the site of Porto do Concelho, Central Portugal. The chemical composition of the objects was determined by Energy Dispersive X-ray Fluorescence (EDXRF) and their microstructural features were identified by Optical Microscopy (OM) and Scanning Electron Microscopy with Energy Dis...
19th c. Coloured stuccos and plasters from Grilos' Church (Oporto, Portugal): M...
Salavessa, E; Candeias, A; Mirao, J; Sousa, L; Duarte, N; Jalali, S; Salgueiro, JThe Oporto’s St. Lourenc¸o Church of the JesuitCollege is locally known, since the St. Augustin BarefootedEremites occupation (1779/80), as Grilos’ Church. TheOporto’s siege laid by D. Pedro and D. Miguel (1832/33)succeed in the college abandonment by Grilo’s Friars.Throughout Augustin Friars presence period, the whiteplasters of the nave (end of 18th c.) were executed and itwas constructed the Holly Sacrament ...
Energy dispersive X-ray fluorescence spectroscopy/Monte Carlo simulation approa...
Bottaini, C; Mirao, J; Figueiredo, M; Candeias, A; Brunettti, A; Schiavon, NEnergy dispersive X-ray fluorescence (EDXRF) is awell-known technique for non-destructive and in situ analysis of archaeological artifacts both in terms of the qualitative and quantitative elemental composition because of its rapidity and non-destructiveness. In this study EDXRF and realistic Monte Carlo simulation using the X-ray Monte Carlo (XRMC) code package have been combined to characterize a Cu-based bow...
Challenging wax-cast figurine serial production unravelled by multi-analytical ...
Le Gac, A; Madeira, T; Pereira, M; Santos, J; Piorro, L; Dias, L; Manso, M; Bleton, J; Longelin, S; Prazeres, C; Mirao, J; marques, J; Candeias, AEight complementary techniques were successfully applied to study a pair of very alike eighteenth-century colored wax figurines belonging to the Museu Nacional Machado de Castro, Coimbra (Portugal): examination under visible and ultraviolet light, X-ray radiography (XRR), neutron radiography and tomography (NR and NT), energy dispersive X-ray fluorescence (EDXRF), scanning electron microscopy coupled with energ...
A COMPARATIVE MULTI-TECHNIQUE INVESTIGATION ON MATERIAL IDENTIFICATION OF GILDI...
Sandu, I; Murta, E; Ferreira, S; Pereira, M; Kuckova, S; Valbi, V; Dias, L; Prazeres, C; Cardoso, A; Mirao, J; Candeias, AThis paper deals with the multi-analytical comparative characterization of 59 samples of gilded and polychrome layers from 7 altarpieces studied during the Gilt-Teller project (www.gilt-teller.pt). The altarpieces studied here belong to seven churches in the areas of Lisbon, Santarém, Portalegre and Guarda and display stylistic and constructive features characteristic to the Mannerism carved wood decoration in ...