J.O. SANTOS
10 resultados
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Artigo IPEN-doc 13990 Normalizacao e padronizacao por meio da transformacao logaritmica em estudos arqueometricos de ceramicas2007 - SANTOS, J.O.; MUNITA, C.S.; VERGNE, C.; OLIVEIRA, P.M.S.Artigo IPEN-doc 13994 Archaeological sites from baixo Sao Francisco, Brazil: Archaeometric approach on Justino site2007 - SANTOS, J.O.; MUNITA, C.S.; VALERIO, M.E.G.; VERGNE, C.Artigo IPEN-doc 10656 Avaliacao da mobilidade de metais e semi-metais em sedimentos coletados em diferentes periodos na Baia de Sepetiba (Rio de Janeiro - Brasil)2005 - CORTEZ, V.D.; RIBEIRO, A.P.; FIGUEIREDO, A.M.G.; SANTOS, J.O.; WASSERMANN, J.C.Artigo IPEN-doc 12047 Application of INAA to provenance study of ceremics from baixo Sao Francisco River, Sergipe, Brazil2007 - MUNITA, C.S.; SANTOS, J.O.; VERGNE, C.; TOYOTA, ROSIMEIRI G.Artigo IPEN-doc 10779 Identificacao de fontes de contaminacao em sedimentos de dundo coletados na Baia de Sepetiba (RJ) por meio de estatistica multivariada2005 - RIBEIRO, A.P.; FIGUEIREDO, A.M.G.; SANTOS, J.O.; CORTEZ, V.D.; WASSERMANN, J.C.Artigo IPEN-doc 10780 Chronological study of archaeological sites from Caninde de Sao Francisco, Sergipe state, Brazil, by thermoluminescence technique2005 - SANTOS, J.O.; SEPULVEDA MUNITA, C.; VALERIO, M.E.G.; VERGNE, M.C.S.Artigo IPEN-doc 19633 Estudo da tecnologia de queima de cerâmica arqueológicas por difratometria de raios X2013 - SANTOS, J.O.; MUNITA, C.S.Artigo IPEN-doc 09504 Caracterizacao quimica da ceramica do sitio Justino - Xingo, SE2003 - LUNA, S.; SANTOS, J.O.; NASCIMENTO, A.; SEPULVEDA MUNITA, C.J.A.; OLIVEIRA, P.M.S.; VERGNE, C.; VALERIO, M.E.G.Artigo IPEN-doc 13431 The archaeometry study of the chemical and mineral composition of pattery from Brazils's northeast2008 - SANTOS, J.O.; MUNITA, C.S.; TOYOTA, R.G.; VERGNE, C.; SILVA, R.S.; OLIVEIRA, P.M.S.In this study, chemical and mineralogical analyses were performed on ceramics and clay samples from Barracão archaeological site located in Baixo São Francisco River. The chemical and mineral analysis was performed by INAA and by means differential scanning calorimetry (DSC). The data set was studied by means of cluster analysis and discriminant analysis. The results showed that the raw material used in ceramics is not local. By using DSC it was possible to discover that the principal minerals in the samples are quartz, feldspars, mica and kaolinite. The existence of kaolinite denotes that the firing temperature of the pottery analyzed was lower than 500 °C. The results obtained in this study, in association with archaeological information, allowed for the identification of the ceramic groups relative to the ceramists occupations at Xingó area.Artigo IPEN-doc 12677 Procedimento de fracionamento e modelagem geoestatística para avaliação dos teores, disponibilidade e mobilidade de cobre em sedimentos da Baia de Sepetiba-RJ2007 - RIBEIRO, A.P.; FIGUEIREDO, A.M.G.; SANTOS, J.O.; COTRIM, M.; DANTAS, E.; WASSERMAN, J.C.; SILVA FILHO, E.This work aimed to'assess copper contamination and mobility in sediments from Sepetiba bay. Rio de Janeiro, where an industrial park composed by about 400 plants, basically metallurgical, is responsible for the input of large amounts of metals, releasing their effluents either directly into the bay or through the local rivers. Copper total concentration, the acid-volatile sulfides (AVS) and the concentration of simultaneously extracted metals (ESEM) were determined in 65 sediment samples collected throughout Sepetiba bay. A geostatistical approach, the attenuation of concentrations model, which aims to estimate the metal mobility was employed. The results obtained showed that Cu presented higher concentrations in the northeastern area, near the entrance of the rivers into the bay. The comparison between copper concentrations with the Canandian Sediment Quality Guidelines (TEL and PEL) showed that Cu levels were below PEL, suggesting low probability of toxicological effects to the aquatic organisms. The ratio FSEM/AVS was below I in northeastern region indicating that in this area Cu is trapped in the sediment as sulfide. The geostatistical approach presented the highest attenuation values for Cu in the northeastern region of Sepetiba bay. indicating low mobility of this metal in this region of the bay, suggesting low availability which is in good agreement with the ESEM/AVS results.