76 research outputs found
Origin and evolution of magmas in the course of subduction initiation, Izu-Bonin Mariana arc â new research project from the Leibniz University of Hannover
Variations in strain affect friction and microstructure evolution in copper under a reciprocating tribological load
The microstructure of the materials constituting a metallic frictional contact strongly influences tribological performance. Being able to tailor friction and wear is challenging due to the complex microstructure evolution associated with tribological loading. Here, we investigate the effect of the strain distribution on these processes. High-purity copper plates were morphologically surface textured with two parallel rectanglesâreferred to as membranesâover the entire sample length by micro-milling. By keeping the width of these membranes constant and only varying their height, reciprocating tribological loading against sapphire discs resulted in different elastic and plastic strains. Finite element simulations were carried out to evaluate the strain distribution in the membranes. It was found that the maximum elastic strain increases with decreasing membrane stiffness. The coefficient of friction decreases with increasing membrane aspect ratio. By analyzing the microstructure and local crystallographic orientation, we found that both show less change with decreasing membrane stiffness
Feasibility of the evidence-based cognitive telerehabilitation program Remind for patients with primary brain tumors
Endoscopic, endonasal, transclival resection of a brainstem cavernoma: a case report and review of the literature
Der Nutzen der endoskopisch assistierten Chirurgie fĂŒr Meningeome der vorderen SchĂ€delgrube
The use of intraoperative CT neuronavigation for dorsal cervical spine procedures promises a better intraoperative orientation in special cases
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