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This work aims to understand the reliability of SnAgCu solder interconnects used in PBGA packages using microstructure evolution, laser moire interferometry and finite-element modeling. A particle coarsening based microstructure evolution of the solder joint material during thermal excursions was studied for extended periods of time lasting for several months. The microstructure evolution and particle coarsening was quantified, and acceleration factors were determined between benign field-use conditions and ATC conditions for PBGA packages with different form factors and for two different...

Sharp reportage joins lyrical and metaphorical explorations of the human condition to create a world of its own, always tinted with the most refined sense of humor, no matter what the subject of these 21 stories.

La gouvernance chefferiale est un rA(c)quisitoire qui relA]ve d'un constat gA(c)nA(c)ral que l'auteur dA(c)montre A l'aide de deux indicateurs, A savoir le viol de la dA(c)centralisation et la personnalisation du pouvoir, en prenant appui sur la province du Bandundu au cours de la mandature 2006-2011. Les principes de fonctionnalitA(c) des provinces et des entitA(c)s territoriales dA(c)centralisA(c)es ne sont ni observA(c)s ni appliquA(c)s par les acteurs de la gouvernance dA(c)centralisA(c)e. Au lieu de l'application des rA]gles, un homme s'institue chef et personnalise le pouvoir voire la...