Search results for "Pun"
showing 10 items of 1409 documents
Massive evaluation and analysis of Poincar�� recurrences on grids of initial data: a tool to map chaotic diffusion
2020
We present a novel numerical method aimed to characterize global behaviour, in particular chaotic diffusion, in dynamical systems. It is based on an analysis of the Poincar\'e recurrence statistics on massive grids of initial data or values of parameters. We concentrate on Hamiltonian systems, featuring the method separately for the cases of bounded and non-bounded phase spaces. The embodiments of the method in each of the cases are specific. We compare the performances of the proposed Poincar\'e recurrence method (PRM) and the custom Lyapunov exponent (LE) methods and show that they expose the global dynamics almost identically. However, a major advantage of the new method over the known g…
A wavelet-based tool for studying non-periodicity
2010
This paper presents a new numerical approach to the study of non-periodicity in signals, which can complement the maximal Lyapunov exponent method for determining chaos transitions of a given dynamical system. The proposed technique is based on the continuous wavelet transform and the wavelet multiresolution analysis. A new parameter, the \textit{scale index}, is introduced and interpreted as a measure of the degree of the signal's non-periodicity. This methodology is successfully applied to three classical dynamical systems: the Bonhoeffer-van der Pol oscillator, the logistic map, and the Henon map.
Analytical properties of horizontal visibility graphs in the Feigenbaum scenario
2012
Time series are proficiently converted into graphs via the horizontal visibility (HV) algorithm, which prompts interest in its capability for capturing the nature of different classes of series in a network context. We have recently shown [1] that dynamical systems can be studied from a novel perspective via the use of this method. Specifically, the period-doubling and band-splitting attractor cascades that characterize unimodal maps transform into families of graphs that turn out to be independent of map nonlinearity or other particulars. Here we provide an in depth description of the HV treatment of the Feigenbaum scenario, together with analytical derivations that relate to the degree di…
Feigenbaum graphs: a complex network perspective of chaos
2011
The recently formulated theory of horizontal visibility graphs transforms time series into graphs and allows the possibility of studying dynamical systems through the characterization of their associated networks. This method leads to a natural graph-theoretical description of nonlinear systems with qualities in the spirit of symbolic dynamics. We support our claim via the case study of the period-doubling and band-splitting attractor cascades that characterize unimodal maps. We provide a universal analytical description of this classic scenario in terms of the horizontal visibility graphs associated with the dynamics within the attractors, that we call Feigenbaum graphs, independent of map…
Tortura y malos tratos en la España democrática
2020
La tortura en la España contemporánea y democrática es una realidad preocupante, como lo muestran Informes de los más relevantes organismos internacionales en la lucha y prevención de la tortura, como el Comité Europeo para la Prevención de la tortura del Consejo de Europa, ONG, sentencias internas del Estado español y, gravemente, sentencias del Tribunal Europeo de Derechos Humanos. Estas condenas a España del TEDH se producen por la violación del artículo 3 del Convenio Europeo de Derechos Humanos, por no realizar de manera exhaustiva y adecuada las investigaciones ante denuncias por malos tratos y torturas, y la última condena también por tratos inhumanos. Realidades que ponen al desnudo…
Cambios en la activación electromiográfica de la musculatura de codo en sujetos sanos comparada con la activación muscular en sujetos con tendinopatí…
2021
La tendinopatía es uno de los problemas de tendón más frecuente de lesión en la actualidad. En el caso de miembros superiores, la alteración en los tendones es bastante significativa tanto en deportistas como en personas que no practican deporte. Sin embargo, hay pocos estudios que reflejen cómo repercute esto en las personas que lo padecen. Objetivos: el objetivo de este estudio es examinar y comparar la actividad electromiografia, la fuerza y la calidad de vida en personas con alteración tendinosa epicondílea del músculo extensor corto de carpo entre personas sanas, además de comprobar el efecto de la punción seca como rama de tratamiento en la actividad muscular, fuerza y dolor. Material…
Alma Mater: 2012/ Ziema
2012
Microsatellite DNA markers for two endemic ground beetles: Carabus punctatoauratus and C. solieri
2002
We isolated and characterized nine and five polymorphic microsatellite loci in the respective ground beetles Carabus punctatoauratus and C. solieri. We tested cross-species amplification of all these loci plus six isolated in C. solieri and for which primers sequences were soon published. From these combined analyses, we obtained 14 and 17 polymorphic markers, respectively, for C. punctatoauratus and C. solieri.
Unholy alliance or way of the future?
2021
This chapter observes how recent Finnish municipal and regional cultural strategies signify and value culture. On the basis of a thematic analysis of 21 strategies, I construct three main categories of their 'culture speech': the first is to approach culture as an instrument that unites different administrative sectors, on the one hand, and helps them to achieve extra-cultural – mostly social and economic – objectives, on the other. The second, is where culture is attached to individuals and communities and their expressions. It is also seen as an 'instrument' benefitting and serving them. The third, is economic. Culture is associated with the cultural and creative industries, and with econ…
An Ecology and Economy Coupling Model. A global stationary state model for a sustainable economy in the Hamiltonian formalism
2020
Abstract The severity of the two deeply correlated crises, the environmental and the economic ones, needs to be faced also in theoretical terms; thus, the authors propose a model yielding a global “stationary state”, following the idea of a “steady-state economics” by Georgescu-Rogen and Herman Daly, by constructing only one dynamical system of ecological and economic coupled variables. This is possible resorting to the generalized Volterra model, that, translated in the Hamiltonian formalism and its Hamilton equations, makes possible to “conjugate” every pair of variables, one economic, the other one ecological, in describing the behavior in time of a unique dynamical system. Applying the …