K-theory for Cuntz-Krieger algebras arising from real quadratic maps

We compute the $K$-groups for the Cuntz-Krieger algebras $\mathcal{O}_{A_{\mathcal{K}(f_{\mu})}}$, where $A_{\mathcal{K}(f_{\mu})}$ is the Markov transition matrix arising from the \textit{kneading sequence }$\mathcal{K} (f_{\mu})$ of the one-parameter family of real quadratic maps $f_{\mu}$.Comment: 8 page

Calibrar: an R package for fitting complex ecological models

The fitting or parameter estimation of complex ecological models is a challenging optimization task, with a notable lack of tools for fitting complex stochastic models. calibrar is an R package that has been developed for fitting complex ecological models to data, including complex Individual Based Models. It is a generic tool that can be used for any type of model, especially those with non-differentiable objective functions. calibrar supports multiple phases and constrained optimization. It implements maximum likelihood estimation methods and automated construction of the objective function from simulated model outputs. User-level expertise in R is necessary to handle calibration experiments with calibrar, but there is no need to modify the model's code, which can be programmed in any language. For more experienced users, calibrar allows the implementation of user-defined objective functions. The package source code is fully accessible from github (htpps://roliveros-ramos.github.com/calibrar) and can be installed directly from CRAN.Comment: 15 pages, 2 appendice

Influence of input data uncertainty in school buildings energy simulation

In developed countries, the building sector is responsible for a very significant share of the total energy consumption. A more detailed and rigorous analysis of building energy performance became possible due to the building simulation software improvement. Traditionally, buildings energy simulation requires the definition of a set of input parameters, which are usually considered as deterministic, neglecting the fact that in reality they have a stochastic nature. Hence, if one intends to evaluate the uncertainty in simulation due to the uncertainty of the input parameters, stochastic methods, such as Monte Carlo simulations should be employed. This paper presents a methodology for the stochastic simulation of school buildings for tackling input data uncertainty. The Monte Carlo method application in the evaluation of the uncertainty of the heat demand of a school building provides an example case where the opportunities and difficulties of the method are explored. The methodology includes parameter characterization, sampling procedure, simulation automatization and sensitivity analysis. Its application results in increased knowledge of the building, allowing to define targets that include the stochastic effect

Estudio geológico de las concentraciones de Co- (Ni-Cu-Fe) en el Silúrico de San Juan de Plan, Valle de Gistaín (Pirineo de Huesca)

Se estudian las mineralizaciones -explotadas en el pasado- de sulfuros, arseniuros y sulfoarseniuros de Co-( Ni-Cu-Fe) existentes en el Paleozoico autóctono de San Juan de Plan, estableciéndose la estructura y los controles (litológico y tectónico) de las mismas a fin de esclarecer su génesis. Se trata de mineralizaciones estratoligadas que se ubican en el seno de un horizonte bien caracterizado mineralógica y petrográficamente (<<brecha ankerítica») y que están ligadas al Sistema Silúrico (pizarras ampelíticas). Los indicios de «brecha ankerítica» no se limitan a dicho Sistema, sino que aparecen también en relación con otras litologías (rocas pelíticas y carbonatadas ordovícicas), pero en este caso son estériles. La distribución espacial de dicha roca ankeritica está controlada por una familia de fracturas E-O cuyo origen se supone relacionado con la intrusión granodiorítica de Bielsa. La roca ankerítica se explica por las acciones metasomáticas debidas a fluidos hidrotermales emanados de dicha intrusión. El horizonte mineralizado, en particular, procede de la ankeritización de calizas folisíferas dolomitizadas, intercaladas entre las pizarras ampelíticas silúricas. Su contenido metálico se supone derivado de estas pizarras. A todos estos episodios, ligados al ciclo hercínico, se superpone una intensa tectónica alpina de fracturación y cabalgamiento que trastorna e interrumpe las estructuras mineralizadas, previamente truncadas por el juego pre-alpino de las fracturas E-O

Estudi hidrodinàmic de les aletes de windsurf

La fluidodinàmica en el windsurf pren una importància que pot arribar a ser decisiva en l’esdevenir d’una competició, ja sigui de velocitat, de agilitat a la taula, etc. És per això que és important estudiar la aerodinàmica i la hidrodinàmica de la taula i de la vela de windsurf per a aconseguir un aparell idoni per al windsurfista. L’objectiu d’aquest treball és la realització d’un estudi específic d’una de les parts més importants de la taula: l’aleta. S’ha basat en l’estudi de la sustentació i la resistència d’una sèrie de perfils, arribant a 2 resultats, amb els quals s’han fet els estudis pertinents, estudiant diferents possibles formes d’aleta amb aquests dos perfils. Utilitzant el programa de simulació CFD, s’estudiarà quantitativament i qualitativament l’efecte que té una aleta o una altra en la velocitat que es podrà arribar a aconseguir i el comportament que tindrà la taula en funcionament

Ecosystem Viable Yields

The World Summit on Sustainable Development (Johannesburg, 2002) encouraged the application of the ecosystem approach by 2010. However, at the same Summit, the signatory States undertook to restore and exploit their stocks at maximum sustainable yield (MSY), a concept and practice without ecosystemic dimension, since MSY is computed species by species, on the basis of a monospecific model. Acknowledging this gap, we propose a definition of "ecosystem viable yields" (EVY) as yields compatible i) with guaranteed biological safety levels for all time and ii) with an ecosystem dynamics. To the difference of MSY, this notion is not based on equilibrium, but on viability theory, which offers advantages for robustness. For a generic class of multispecies models with harvesting, we provide explicit expressions for the EVY. We apply our approach to the anchovy--hake couple in the Peruvian upwelling ecosystem