O texto discorre sobre a história dos meios de pagamentos, desde os tempos primitivos, quando a moeda era um meio de troca, passando pelos importantes marcos a exemplo de: o entendimento do dinheiro como um sistema de ...

X-Radiography technique has been used effectively for decades to evaluate and identify differences in homogeneities in samples. It is a simple, fast and non-destructive technique that provides a view of internal structure ...

Geochemical characterization studies using PIXE were carried out on 21 vitreous dacite artifacts from early formative archaeological sites in the Atacama region, in northern Chile, and on 13 samples taken from two potential ...

Total charge deposited by a proton beam in an insulator during PIXE analysis has been indirectly determined using a Mylar film coated with cobalt. Elemental concentrations in the samples, pieces of volcanic glass, were ...

This study aims to present the main difficulties faced by the company Alfa Mineração SA due to the process of implementation of PIX, a new payment method created by the Central Bank of Brazil to attend to the demands of ...

A method based on the refinement of atomic and experimental parameters developed for the description of PIXE spectra is presented and applied to standardless semi-quantitative PIXE analysis. This method was implemented in ...