New high order sufficient conditions for configuration tracking

In this paper, we propose new conditions guaranteeing that the trajectories of a mechanical control system can track any curve on the configuration manifold. We focus on systems that can be represented as forced affine connection control systems and we generalize the sufficient conditions for tracking known in the literature. The new results are proved by a combination of averaging procedures by highly oscillating controls with the notion of kinematic reduction.Comment: arXiv admin note: text overlap with arXiv:0911.536

Análisis criptopaleontológico del lapidario de Teofrastro (s. III a.C.)

La obra"Perì líthon" o"Tratado de Piedras" de Teofrasto, es considerado el texto más antiguo conservado sobre minerales y rocas, aunque haya llegado hasta nosotros incompleto. En este trabajo se analiza su contenido comparándolo con el de otros lapidarios antiguos y se concluye que once de las piedras que refiere y que vienen indicadas con nombres geográficos o crípticos son fósiles de plantas, vertebrados o químicos. Por eso, esta obra debe considerarse también como el tratado más antiguo que conocemos sobre paleontología, pues además de los fósiles que menciona, en ella se alude expresamente al proceso de fosilización. Palabras clave: Criptopaleontología

Reduced kinetic mechanisms for modelling LPP combustión in gas turbines

Reduced kinetic mechanisms for modelling LPP combustión in gas turbine

Estrategias para prevenir y detectar el plagio

Mesa redonda celebrada en la V Conferencia de Directores de Escuelas de Doctorado, celebrada el 2 de noviembre de 2017 en el Rectorado de la Universidad de Córdoba

Global controllability tests for geometric hybrid control systems

Hybrid systems are characterized by having an interaction between continuous dynamics and discrete events. The contribution of this paper is to provide hybrid systems with a novel geometric formulation so that controls can be added. Using this framework we describe some new global controllability tests for hybrid control systems exploiting the geometry and the topology of the set of jump points, where the instantaneous change of dynamics take place. Controllability is understood as the existence of a feasible trajectory for the system joining any two given points. As a result we describe examples where none of the continuous control systems are controllable, but the associated hybrid system is controllable because of the characteristics of the jump set.Comment: 27 pages, 5 figure