Diseño de situaciones hipotéticas de enseñanza-aprendizaje para estudiar el conocimiento didáctico del contenido del profesor de estadística

Se propone una forma de analizar el conocimiento didáctico del contenido (CDC) del profesor de Estadística a través del diseño de situaciones hipotéticas de enseñanza – aprendizaje. Las situaciones hipotéticas se construyeron a partir de un sistema de dimensiones e indicadores del CDC y de la definición de los objetivos de aprendizaje de la representación gráfica al nivel de pensamiento estadístico. Se describe el proceso para su diseño

Sobre la naturaleza conceptual y metodológica del conocimiento del contenido pedagógico en Matemáticas: una aproximación para su estudio

A partir de una revisión de las investigaciones en educación matemática sobre el conocimiento profesional del profesor, en este trabajo se intentan integrar y presentar las características conceptuales del Conocimiento del Contenido Pedagógico (CCP) específico de las matemáticas. Desde una aproximación empírica, inductivo - deductiva, se han analizado las características y componentes del CCP, se han revisado cuestiones metodológicas sobre cómo estudiarlo y a partir de ahí, se desarrolló un procedimiento para la definición de qué elementos conceptuales era posible estudiar. Para realizar este estudio se utilizó el análisis de contenido con el que se determinaron un sistema de dimensiones e indicadores con los cuales se organizaron y estructuraron la variedad de características y conceptos a examinar de los componentes del CCP

Public broadcasting service under austerity: cross-comparison between Portugal and Spain

Versão final do autor / Accepted version | Pré-publicação online do artigo (11/04/2020) / Online First (11/04/2020)Following the global financial crisis of 2007/08, five European countries called for external financial assistance. Austerity policies were implemented, but the extent to which the bailout deal impacted the Portuguese and Spanish public service broadcasters has not been yet thoroughly investigated. Both born in dictatorial regimes, these public services broadcasters in democratic contexts followed different solutions for governance and funding. This article investigates the changes produced in the Portuguese and Spanish public media under the austerity era, analysing the policy measures implemented, as well as the economic and ratings performance of both public service broadcasters. The aim is to assess if external factors (such as external assistance) originated similar effects in both countries Results show that, in spite of different funding and governance models adopted, both public services were heavily impacted in terms of revenues and ratings and that the austerity period provided the context to set up a neoliberal ideological point-of-view. Both public services lost legitimacy and their cultural and political role was undermined by a discussion that was grounded on economic factors alone.The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was financed by Portuguese national funds through FCT – Foundation for Science and Technology, I.P., under the project UIDB/00736/2020

A new index to measure positive dependence in trivariate distributions

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)We introduce a new index to detect dependence in trivariate distributions. The index is based on the maximization of the coefficients of directional dependence over the set of directions. We show how to calculate the index using the three pairwise Spearman's rho coefficients and the three common 3-dimensional versions of Spearman's rho. We obtain the asymptotic distributions of the empirical processes related to the estimators of the coefficients of directional dependence and also we derive the asymptotic distribution of our index. We display examples where the index identifies dependence undetected by the aforementioned 3-dimensional versions of Spearman's rho. The value of the new index and the direction in which the maximal dependence occurs are easily computed and we illustrate with a simulation study and a real data set. (C) 2012 Elsevier Inc. All'rights reserved.We introduce a new index to detect dependence in trivariate distributions. The index is based on the maximization of the coefficients of directional dependence over the set of directions. We show how to calculate the index using the three pairwise Spearma115481495FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPESP [10/51940-5]CNPq [485999/2007-2, 476501/2009-1]10/51940-5485999/2007-2; 476501/2009-

Comment on "Robustness of proxy-based climate field reconstruction methods" by Michael E. Mann et al.

Mann et al. [2007a] (hereafter M07a) test the climate field reconstruction (CFR) method known as regularized expectation maximization (RegEM) using pseudoproxies derived from millennial simulations of past climate. These simulations were derived from two General Circulation Models (GCMs) driven with natural and anthropogenic forcings: the National Center for Atmospheric Research Climate System Model (CSM) [Boville et al., 2001] and the Hamburg Atmosphere-Ocean Coupled Circulation Model (ECHO-g) [Legutke and Voss, 1999]. There has been some discussion about the amplitude of millennial changes in simulations from these two GCMs [Goosse et al., 2005; Mann et al., 2005; Osborn et al., 2006; González-Rouco et al., 2006], particularly with regard to how it may impact the assessment of CFR methods in pseudoproxy experiments [Mann et al., 2005; Mann, 2007; Zorita et al., 2007; Mann et al., 2007a, 2007b]

Hydrographic conditions and mesozooplankton species distribution in the Bay of Biscay shelf during spring 2004

Mesozooplankton community structure on the southern Bay of Biscay shelf and its relationship with environmental conditions was analysed during spring 2004. According to thermohaline characteristics, we observed two frontal zones along the shelf (around 7° and 3°W) that gave rise to three distinct hydrographic regions. The westernmost part of the shelf (WC), defined by the presence of relatively warm and salty water related to the presence of the Iberian Poleward Current (IPC), the easternmost region (EC), characterised by colder and fresher water, and a region in the Central Cantabrian Sea (CC) with thermohaline characteristics in between these two extremes. Besides, a clear coastal-offshore pattern was found in relation to the mixed layer depth (MLD). We observed a good agreement between the aforesaid hydrographic regions and the distribution of zooplankton species. In the WC region, the community structure was dominated by Paracalanus parvus, Oithona helgolandica, Acartia clausii and Clausocalanus pergens, while in the EC region the most dominant species were Noctiluca scintillans and Oncaea media. The CC region showed similar composition of copepods than the WC region but larvaceans (Oikopleura and Fritilaria) were also abundant. Superimposed to this along-shelf pattern, relative abundances differed also between coastal and shelf stations.SARDYN EU –project (QLRT-2001-00818

The structure of the class of maximum tsallis-havrda-chavat entropy copulas

A maximum entropy copula is the copula associated with the joint distribution, with prescribed marginal distributions on [0, 1], which maximizes the Tsallis-Havrda-Chavat entropy with q = 2. We find necessary and sufficient conditions for each maximum entropy copula to be a copula in the class introduced in Rodriguez-Lallena and Ubeda-Flores (2004), and we also show that each copula in that class is a maximum entropy copula.A maximum entropy copula is the copula associated with the joint distribution, with prescribed marginal distributions on [0, 1], which maximizes the Tsallis-Havrda-Chavat entropy with q = 2. We find necessary and sufficient conditions for each maximum entropy copula to be a copula in the class introduced in Rodriguez-Lallena and Ubeda-Flores (2004), and we also show that each copula in that class is a maximum entropy copula.18

Temperature dependence of the magnetization processes in Co/Al oxide/Permalloy trilayers

The magnetization process of Co/Al oxide/Py trilayers and its evolution with the temperature have been analyzed. The particular behavior of the Co layers, including the shift of the hysteresis loops and a coercivity increase with the decrease of temperature, is related with the apparition of a CoO layer at the Co/Al-oxide interface

Mesozooplankton species distribution in the NW and N Iberian shelf during spring 2004: Relationship with frontal structures.

We have analysed the mesozooplankton community structure in the southern Bay of Biscay shelf and its relationship with the hydrographic conditions during spring 2004. According to thermohaline characteristics, we observed two frontal zones of distinct origin along the shelf (around 7° and 3°W), that allowed us to differentiate three different hydrographic domains. The westernmost part of the shelf (WC), defined by the presence of relatively warm and salty water related to the presence of the Iberian Poleward Current (IPC), the easternmost region (EC), characterized by colder and fresher water and subject to the influence of freshwater inputs from the Adour river in the French coast, and a region in the Central Cantabrian Sea (CC), where thermohaline characteristics were intermediate between these two extremes. The mixing layer depth (MLD) regime in these areas was also different: theWCregion was characterized by a mixed water column, whereas in the EC region the river discharges produces stratification of the upper meters of the water column (b10 m); in the CC region, we found a distinct vertical mixing regime that separated coastal (stratification) from shelf (mixed water column) stations, giving rise to a notorious across-shelf front. We found a good match between the aforesaid hydrographic regions and the distribution of mesozooplankton species composition and community assemblages: the Mantel correlation between physical variables and mesozooplankton distribution was highly significant (n=63, r=0.70, αb0.001). In the WC region, the community was dominated by Paracalanus parvus, Oithona helgolandica, Acartia clausi and Clausocalanus pergens, while in the EC region the most dominant species were Noctiluca scintillans, Oncaea media and Temora longicornis. The CC region showed similar composition of copepods than the WC region, but larvaceans (Oikopleura spp. and Fritillaria spp.) were more abundant in the CC region than in the WC region. Within each zone, the relative abundances of the dominant species differed between coastal and shelf locations.SARDYN EUproject (QLRT-2001-00818) Consejería de Educación y Cultura del Principado de Asturias’ (FICYT)