508 research outputs found
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 lÃthon" 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 crÃpticos son fósiles de plantas, vertebrados o quÃmicos. Por eso, esta obra debe considerarse también como el tratado más antiguo que conocemos sobre paleontologÃa, pues además de los fósiles que menciona, en ella se alude expresamente al proceso de fosilización. Palabras clave: CriptopaleontologÃa
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
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