Tribological behaviour of hard carbon coatings sliding against aluminum oxide, silicon nitride and steel up to 250 deg C in air

The high temperature tribological performance of tetrahedral amorphous carbon coatings has been analyzed at elevated temperatures up to 250 deg C. The results show that the counterbody material influences the friction and wear behavior and therefore coating life time strongly. This effect is well known for these coatings at room temperature under dry environmental conditions, equivalent to conditions above 100 deg C when water molecules desorb from the surface. However, the sharp difference in tribological performance between silicon nitride on the one hand and alumina and steel on the other hand cannot be understood in this context. Analyzing the friction behavior during the running-in phase, it is evident that only alumina and steel form a stable interface with constant low friction and relatively low wear rates. Silicon nitride forms obviously an unstable interface with fluctuating COF and relatively high wear rates

Explosive Compaction of Nanosized TiN-Powders

Nanosized titanium nitride powders with different specific surface areas and grain size distributions were densified by dry-pressing, isostatic pressing and explosive compaction. The experimental results show that nano-sized powders can be densified up to 90 % of the theoretical density by explosive compaction without significant grain growth. Microstructure and phase composition of explosive-compacted samples were characterized by optical analysis and X-ray diffraction, respectively. In the green samples exist both areas with net-shaped flaws and areas without large microstructural defects. The green compacts have been sintered and the linear shrinkage and the relative density were simultaneously recorded by means of an integrated dilatometer

Stand Up, Students! Decisional Cues Reduce Sedentary Behavior in University Students

La siguiente investigación tiene como título “Relación del Proceso de Amparo interpuesto por los trabajadores judiciales con el despido arbitrario en el juzgado mixto de la sede judicial Moyobamba 2013 – 2014”, teniendo como objetivo general conocer la relación del proceso de amparo interpuesto por los trabajadores judiciales por el despido arbitrario en el juzgado mixto de la sede judicial Moyobamba 2013 – 2014. El tipo de investigación es de tipo NO EXPERIMENTAL y el diseño de la investigación es correlacional, teniendo como población diez (10) sentencias del periodo 2013 – 2014 de la sede judicial de Moyobamba, utilizándose la técnica de análisis documental para el acopio de los datos. Se llegó a la conclusión principal, que si existe relación entre el proceso de amparo y el despido arbitrario en las sentencias de los trabajadores judiciales en el juzgado mixto de la sede judicial Moyobamba durante el 2013 – 2014, obteniendo como resultado la aprobación de la hipótesis general, el cual señala que el proceso de amparo se relaciona con el despido arbitrario, porque es la única vía e idónea para obtener la reposición a su centro de trabajo y la protección adecuada de los trabajadores del régimen laboral privado ante un despido arbitrario