A new thermomechanical fracture analysis approach for 3D integration technology
In this study, the peridynamic framework is applied to model heat diffusion to derive peridynamic heat diffusion equations. A numerical scheme is put forward and implemented in order to establish the validity of these equations. Finally, an approach is developed for coupled solution of heat conduction and solid mechanics equations in the realm of peridynamics.
Meshless Peridynamics Method for Modeling Corrosion Crack Propagation
Corrosion crack propagation is a result of complex interactions between electrochemical processes and stress redistribution in response to material/environment. In this work, we present a recently developed meshless peridynamics approach for modeling corrosion damage and resulting crack propagation phenomena under synergistic effects of corrosion and mechanical loading. The approach is based on non-local peridynamics theory that replaces governing equations of classical continuum mechanics with integrodifferential equations that are easy to solve across discontinuities like cracks. Here we summarize the peridynamic modeling framework developed for corrosion damage scenarios and illustrate its capabilities using numerical simulations of different test scenarios. The framework is able to capture crack path propagation under synergistic influence of corrosion and mechanical loading, without the need to re-mesh the domain or special numerical treatments.
Use of a specific antiserum for renin detection in human kidney.
The use of anti-human renin antibodies made possible the intrarenal localization of renin in human kidney by immunofluorescence. In normal kidney, only some juxtaglomerular apparatus (JGA) were fluorescent. In these JGA, granular or diffuse fluorescence was only seen in afferent arterioles and was not present in all cells. In the ischemic areas of partially infarcted kidney, fluorescence was seen in all JGA and in interlobular arteries. In these arteries the most eccentric cells were often the most positive. In the nonischemic areas of the same kidneys, fluorescence was not seen in JGA, but was observed in proximal tubular cells, suggesting the reabsorption of filtered renin at this site.