JOSE OSMAN DOS SANTOS

JOSE OSMAN DOS SANTOS

Página do item completo

Resultados de Busca

Agora exibindo 1 - 4 de 4

Aplicacao da analise discriminante e redes neurais artificiais para classificacao de ceramicas arqueologicas com base na composicao quimica
2008 - SANTOS, JOSE O. dos; OLIVEIRA, ALEX P.A. de; MUNITA, CASIMIRO S.
Identificacao de valores discrepantes por meio da distancia mahalanobis
2006 - OLIVEIRA, PAULO T.M. e S. de; SANTOS, JOSE O. dos; SEPULVEDA MUNITA, CASIMIRO
Arqueoestatística aplicada ao estudo composicional de cerâmicas arqueológicas
2007 - SANTOS, J.O.; MUNITA, C.S.; VALERIO, M.E.G.; VERGNE, C.
Chemical studies of the ceramics are based on the assumption that ceramic produced from a specific clay will show a similar chemical composition and that its composition will be distinguished from that of ceramics produced from a different clay. It is common to determine the chemical composition of ceramic using techniques such as neutron activation analysis, inductively coupled plasma spectroscopy, x-ray fluorescence analysis. In this work 74 ceramics fragments and 1 clay from three archaeological sites (São José 26, Saco da Onça 24 and Curituba: 24) located in the Brazilian Northeast were analyzed using INAA to determine the concentration of 24 chemical elements. The results were interpreted by mean of Archaeostatistics techniques, such as Linear Discriminant Analysis and principal components, which was utilized to facilitate identification of compositional groups. The Mahalanobis distance was applied for detecting outliers and Wilks’s lambda provided the critical values. It was obtained that samples from São José and Curituba are constitute of ceramic pastes different, while samples from Saco da Onça Site overlap the pottery samples from São José and Curituba Sites.
Correlations between chemical composition and provenance of Justino site ceramics by INAA
2008 - SANTOS, J.O.; MUNITA, C.S.; VALERIO, M.E.G.; VERGNE, C.; OLIVEIRA, P.M.S.
Instrumental neutron activation analysis (INAA), have been used for the definition of compositional groups of potteries from Justino site, Brazil, according to the chemical similarities of ceramic paste. The outliers were identified by means of robust Mahalanobis distance. The temper effect in the ceramic paste was studied by means of modified Mahalanobis filter. The results were interpreted by means of cluster, principal components, and discriminant analyses. This work provides contributions for the reconstruction of the prehistory of baixo São Francisco region, and for the reconstitution of the Brazilian Northeast ceramist population of general frame.