C. Siemers

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Titanium alloys like Ti6Al4V are widely used in medical engineering. However, the mechanical and chemical properties of titanium alloys lead to poor machinability, resulting in high production costs of medical products. To improve the machinability of Ti6Al4V, 0.9% of the rare earth element lanthanum (La) was added. The microstructure, the mechanical, and(More)
Bohrmehl fällt beim Aufbohren der Knochen im Rahmen einer Osteosynthese an. Bisher liegen jedoch nur widersprüchliche Informationen über seine Zusammensetzung vor. Allem voran bleibt zu klären, ob Bohrmehl noch vitale Zellen enthält. Ziel der vorliegenden Untersuchung war die praxisnahe Gewinnung von Zellen aus humanem Bohrmehl und ihre Charakterisierung.(More)
Reaming debris is generated in the course of intramedullary reaming of long bones. Up to now there has been little information about the composition of reaming debris. Especially, it remains to be elucidated if reaming debris contains vital cells. The goal of the present vitro investigation has been the harvest of cells from human reaming debris and the(More)
Nickel-base superalloys like Alloy 625 are widely used in power generation applications and in the oil and gas industry due to their unique properties especially at elevated temperatures. The chip formation process of Alloy 625 is not yet well understood. Therefore, the cutting process of this alloy has been studied in detail by means of orthogonal cutting(More)
Internal defects and strain in nanoparticles can influence their properties and therefore measuring these values is relevant. Powder diffraction techniques (neutron and synchrotron) are successfully used to characterize internal strain in the core-shell Ni(3)Si(Al)-SiO(x) nanoparticles having mean diameters of approximately 80 nm. The nanoparticles, which(More)
Singuläre oder repetitive stumpfe Traumen der Handfläche können zur Ausbildung echter Aneurysmen der Arterien des Hohlhandbogens führen. Die Symptomatik, welche zusammenfassend als „Hypothenar-Hammer-Syndrom“ bezeichnet wird, reicht vom schmerzhaften, manchmal pulsierenden Tumor der Hohlhand über Durchblutungsstörungen bei Thrombosierung des Aneurysmas bis(More)
We describe a dynamical phase transition occurring within a shear band at high temperature and under extremely high shear rates. With increasing temperature, dislocation deformation and grain boundary sliding are supplanted by amorphization in a highly localized nanoscale band, which allows for massive strain and fracture. The mechanism is similar to shear(More)
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