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The mechanical properties of a ceramic superconductor material (YBaCuO or Y-123) have been studied using the Nanoindentation technique, for Bridgman and Top Seeded Melt Growth textured samples. The structure of the textured material is heterogeneous, and two different phases are present: a matrix of Y-123 and Y-211 spherical or quasi-spherical inclusions. The Hardness and Young's modulus have been obtained for each phase using a sharp tip indenter and the Oliver and Pharr equations. The different fracture mechanisms activated around and under the residual imprints have been observed by...

From the early days of its recognized occurrence, AIDS has been per ceived as posing tremendous threats, burdens and challenges to human beings. Individuals, societies and, in a global point of view, mankind are affected by the effects of the HN infection, the nature and extent of which is still unclear in many ways. In the beginning only biomedical and epidemiological analyses of the problem were the top research priori ties, the former laden with great hopes that it may soon be possible to stop the spread of the disease and to overcome its physical impact. Yet it soon became clear that AIDS...