Search results for " umbral"
showing 5 items of 5 documents
No linealidad y asimetría en el proceso generador del Índice Ibex35
2013
This paper analyzes the behavior of Ibex35 from January 1999 to December 2001, in order to check if it follows a different process from random walk so its return is not a white noise and it can be predictable, against the efficient market hypothesis. For that, a nonlinear generating process of return will be considered and a STAR-APARCH model will be specified. This model allows a nonlinear behavior in the conditional mean and in the conditional variance. The empirical results show that the Ibex35 follows a nonlinear and asymmetric process, both in the conditional mean as in the conditional variance, so the weak-version of efficient market hypothesis is rejected. El trabajo analiza el compo…
Products of Bessel functions and associated polynomials
2013
The symbolic method is used to get explicit formulae for the products or powers of Bessel functions and for the relevant integrals.
El descubrimiento de nuevos fármacos, concepto umbral en farmacología.
2021
[EN] The so-called “threshold concepts” are present in all areas of study. Its acquisition by the student represents a milestone in the advancement of the conceptual understanding of a subject. They are often difficult to learn, but when they are overcome they generate a reconceptualization that allows progress and deepening in the subject of study. We present an activity designed to develop a key threshold concept in pharmacology, the drug discovery process. To do this, we develop a practical laboratory project that will integrate both the extraction and search for active ingredients and the simulation of some aspects of their clinical trials in the phase I.
El tipo de cambio real dólar-euro y el diferencial de intereses reales
2006
This paper investigates whether threshold effects exist in the relationship between dollar-euro real exchange rate and real interest differential, over the period January 1984 to December 2004. We specify a three-regime threshold model and the results provide evidence that there is no threshold effect in the short term, but the nonlinear behaviour of real exchange rate implies threshold effect in the long term. On the other hand, the nonlinearity into the behaviour of real exchange rates can be modelled by a Band-TAR which implies a symmetric response to the real interest differential outside the bank. Finally, into the threshold band the behaviour of real exchange rate is near to follow a …
La luz y el color en la arquitectura contemporánea: los nuevos escenarios urbanos
2010
"Cuando a finales del siglo XIX, Claude Monet pintó la catedral de Rouen, vista en diferentes horas del día, desde el amanecer al atardecer, nos da una demostración de cómo un solo monumento podría tener configuraciones y aspectos diferentes debido exclusivamente a la capacidad de la luz de modelar formas. Pero también nos da otra lección: de cuanto sea importante en la fruición de un lugar la posibilidad de leer el paso del tiempo a través de la alteración de la percepción debida a la evolución de las formas y los colores, específicamente en relación con el cambio de luz "[1]. La investigación se propone una reinterpretación del paisaje urbano, considerando el proyecto luz como elemento in…