Comentario: “El pivote geográfico de la historia”, el surgimiento de la geopolítica clásica y la persistencia de una interpretación telúrica de la política global

Depto. de Historia, Teorías y Geografías PolíticasFac. de Ciencias Políticas y SociologíaTRUEpu

La Geopolítica como "ciencia del Estado": el mundo del general Haushofer

Depto. de Historia, Teorías y Geografías PolíticasFac. de Ciencias Políticas y SociologíaTRUEpu

El retorno de la geopolítica: nuevos y viejos conflictos bélicos

Depto. de Historia, Teorías y Geografías PolíticasFac. de Ciencias Políticas y SociologíaTRUEpu

The effect of minimum quantity lubrication in the intermittent turning of magnesium based on vibration signals

The present work shows an experimental investigation on intermittent turning based on vibration signals. The dependence of vibrations on the feed rate, minimum quantity lubrication (MQL) flow rate and the type of the interruption of the workpiece is evaluated. The results indicate that a part of the vibrations depends on the flow rate of the MQL system and its interaction with the feed rate, finding no dependency on the type of interruption. The influence of the MQL system is greater when machining at the lower feed rate. In addition, a strong relation between surface roughness and vibrations is identified. However, this relation is quite different depending on the environment used. In general, under dry conditions, the higher the vibrations the higher the surface roughness, while the opposite occurs when the MQL system is used.publishe

Territorialidad y fronteras del estado-nación: Las condiciones de la política en un mundo fragmentado

Sin resume

Asymptotic and numerical analysis of a simple model for blade coating

Motivated by the industrial process of blade coating, the two-dimensional flow of a thin film of Newtonian fluid on a horizontal substrate moving parallel to itself with constant speed under a fixed blade of finite length in which the flows upstream and downstream of the blade are coupled via the flow under the blade is analysed. A combination of asymptotic and numerical methods is used to investigate the number and nature of the steady solutions that exist. Specially, it is found that in the presence of gravity there is always at least one, and (depending on the parameter values) possibly as many as three, steady solutions, and that when multiple solutions occur they are identical under and downstream of the blade, but differ upstream of it. The stability of these solutions is investigated, and their asymptotic behaviour in the limits of large and small flux and weak and strong gravity effects, respectively, determined