1,720,977 research outputs found
The analysis of archaeological glass by inductively coupled plasma emission spectroscopy
No full textAnalysis and classification of ceramic material excavated on a South Italian archaeological site
No full textApplication of multivariate chemometric techniques to the study of Roman pottery (terra sigillata)
No full textSupervised and unsupervised pattern recognition techniques were used to classify 48 sherds of Roman pottery (terra sigillata), analysed by inductively coupled plasma atomic emission spectrometry and atomic absorption spectrometry for seven major and minor elements (Al, Fe, Ca, Mg, K, Ti and Mn). Hierarchical agglomerative clustering and principal component analysis were used to classify the studied material into compositional groups which could account for different centres of production; soft independent modelling of class analogy (SIMCA) was used to solve questions regarding doubtful assignment
Scientific analysis of seventh-century glass fragments from the Crypta Balbi in Rome
No full textInductively coupled plasma emission spectroscopy, reflectance spectroscopy and X-ray diffraction were used to study seventh-century AD glass fragments from the Crypta Balbi in Rome. All the samples were found to be silica-soda-lime glasses. Iron determines the colour of blue-green, green and yellow-green transparent glasses; chemical composition suggests deliberate addition of iron and/or manganese in about half the samples. Copper was found as the main colourant in red, pale blue and blue-green opaque fragments; elemental copper acts as an opacifier in red glass, and calcium antimonate in white, pale blue and blue-green glasses. Detection of antimony in transparent fragments suggests recycling of opaque mosaic tesserae
Technology of production of fine pottery excavated on a western Greek site investigated by scanning electron microscopy coupled with energy-dispersive X-ray detection
No full textScanning electron microscopy (SEM) coupled with energy-dispersive x-ray detection was used to study fragments of fine pottery excavated on the archaeological site at Locri Epizephiri (Southern Italy). The fragments analysed were specimens of black coated ware and included pieces suspected to have been produced on the site in the course of the fourth and third centuries BC and suspected imports from foreign centres of production. Comparison between the composition of slip and body of the samples indicated that selection and refinement of clays led to silicon and calcium depletion and aluminium, iron and potassium enrichment in the coating. In addition, pronounced depletion of magnesium was observed in the slip of the imported wares and the earlier local products, but not of the later local wares; this might account for the low quality of some 3rd century products with respect to the earlier pieces. Examination of SEM images indicated that the thickness of the surface slip reaches up to about 20–25 μm on the imported sherds, but measuresca. 10–20 μm on most of the local products
Technological features of Roman Terra Sigillata from Gallic and Italian centres of production
No full textScientific analysis of roman glass from Augusta Praetoria
No full textFifty-five fragments of Roman glass from Augusta Praetoria (Aosta, Italy) were analysed by inductively coupled plasma optical emission spectroscopy determining 15 elements (Si, Na, Ca, Al, Fe, Mg, Mn, Ti, Sr, Ba, Cr, Ni, Cu, Co and Pb) on dissolved samples; in addition, potassium was determined by flame atomic absorption spectroscopy. The analytical results indicate that all the fragments, with one exception, are silica-soda-lime glasses; (he exception is a potash glass. Cluster analysis was performed on the analytical data by accounting for either 14 (all the elements searched for but Ni and Pb) or eight elements (after further removal of Si, Fe, Mn, Cr, Cu and Co from the data set). The results obtained indicate that, once colouring and decolouring agents are removed, the classification of the glasses seems to be mainly determined by chronology; separate groups within coeval fragments may indicate different provenances
Studio di materiale di epoca romana mediante analisi per attivazione neutronica strumentale
No full textA study of Roman glass by reflectance and electron paramagnetic resonance spectroscopies
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