Search results for "Dynamic"

Families of piecewise linear maps with constant Lyapunov exponent

2012

We consider families of piecewise linear maps in which the moduli of the two slopes take different values. In some parameter regions, despite the variations in the dynamics, the Lyapunov exponent and the topological entropy remain constant. We provide numerical evidence of this fact and we prove it analytically for some special cases. The mechanism is very different from that of the logistic map and we conjecture that the Lyapunov plateaus reflect arithmetic relations between the slopes.

The role of the tidal and wind forces on the hydrodynamic flow pattern in the Augusta Harbour (Italy)

2012

Surface charges at the CaF2/water interface allow very fast intermolecular vibrational-energy transfer

2020

Abstract We investigate the dynamics of water in contact with solid calcium fluoride, where at low pH, localized charges can develop upon fluorite dissolution. We use 2D surface‐specific vibrational spectroscopy to quantify the heterogeneity of the interfacial water (D2O) molecules and provide information about the sub‐picosecond vibrational‐energy‐relaxation dynamics at the buried solid/liquid interface. We find that strongly H‐bonded OD groups, with a vibrational frequency below 2500 cm−1, display very rapid spectral diffusion and vibrational relaxation; for weakly H‐bonded OD groups, above 2500 cm−1, the dynamics slows down substantially. Atomistic simulations based on electronic‐structu…

Existence de points fixes enlacés à une orbite périodique d'un homéomorphisme du plan

1992

Let f be an orientation-preserving homeomorphism of the plane such that f-Id is contracting. Under these hypotheses, we establish the existence, for every periodic orbit, of a fixed point which has nonzero linking number with this periodic orbit.

Investigation of charge ratio variation in mRNA – DEAE-dextran polyplex delivery systems

2019

Biomaterials 192, 612 - 620 (2019). doi:10.1016/j.biomaterials.2018.10.020

Exploration of the Activation Mechanism of the Epigenetic Regulator MLL3: A QM/MM Study

2021

The mixed lineage leukemia 3 or MLL3 is the enzyme in charge of the writing of an epigenetic mark through the methylation of lysine 4 from the N-terminal domain of histone 3 and its deregulation has been related to several cancer lines. An interesting feature of this enzyme comes from its regulation mechanism, which involves its binding to an activating dimer before it can be catalytically functional. Once the trimer is formed, the reaction mechanism proceeds through the deprotonation of the lysine followed by the methyl-transfer reaction. Here we present a detailed exploration of the activation mechanism through a QM/MM approach focusing on both steps of the reaction, aiming to provide new…

Bernoulli effect

2010

Descripción del mecanismo mediante el cual las cuerdas vocales producen los sonidos vocálicos y consonánticos que escuchamos Explanation of the mechanism by which the vocal folds produce the sounds we hear in vowel and voiced consonant.

STABILITY OF A STOCHASTICALLY PERTURBED MODEL OF INTRACELLULAR SINGLE-STRANDED RNA VIRUS REPLICATION

2019

Compared to the replication of double-stranded RNA and DNA viruses, the replication of single-stranded viruses requires the production of a number of intermediate strands that serve as templates for the synthesis of genomic-sense strands. Two theoretical extreme mechanisms for replication for such single-stranded viruses have been proposed; one extreme being represented by the so-called linear stamping machine and the opposite extreme by the exponential growth. Of course, real systems are more complex and examples have been described in which a combination of such extreme mechanisms can also occur: a fraction of the produced progeny resulting from a stamping-machine type of replication that…

La esterilización forzada en intersecciones distintas : un enfoque estructural para el análisis de las desigualdades complejas | Forced sterilization…

2019

Resumen: El artículo propone profundizar un enfoque de la interseccionalidad poco desarrollado dentro de los estudios jurídicos: la interseccionalidad estructural. A través del análisis de dos casos de esterilización forzosa del TEDH, referidos a dos grupos interseccionales distintos (mujeres gitanas y mujeres con discapacidad), la contribución tiene como fin subrayar el interés que conlleva la investigación sobre las dinámicas de poder en los casos de desigualdad compleja. En ambos casos emergen algunos elementos críticos comunes a la configuración del derecho y de su interpretación a la hora de enfrentarse al solapamiento de múltiples categorias de discriminación.
 Abstract: This pap…

Self-Organized Linguistic Systems: From traditional AI to bottom-up generative processes

2018

Este trabajo busca explorar el potencial de los procesos generativos bottom-up en el contexto de la producción conlang, con el objetivo de describir las bases de un nuevo campo de investigación: los Sistemas Lingüísticos Autoorganizados o SOLS, específicamente bajo la perspectiva doble de sistemas autoorganizados y lenguajes construidos. El enfoque SOLS proporciona un marco para la creación de lenguajes artificiales autogenerados y puede servir como punto de partida para el desarrollo de lenguajes dependientes del contexto o específicos del dominio. Reconoce que el desarrollo de conlangs puede ocurrir en sociedades artificiales de agentes simples, como resultado de interacciones sociales en…