Investigación mineralógica de arenas de aluvión en la provincia de Cáceres (Ríos Búrdalo y Burdalillo)

Se han estudiado aluviones recogidos en los ríos Búrdalo y Burdalillo, afluentes del Guadiana, provincia de Cáceres, iniciándose con este trabajo una serie de investigación mineralógica de arenas de aluvión en la Península Ibérica. Por los resultados obtenidos del análisis mineralógico podemos definir estos aluviones como ilmeníticos

El paisaje eólico de la llanura aluvial de San Juan (Llanura Manchega Central)

[Resumen] El campo dunar de la Llanura aluvial de San Juan, esta caracterizado por la presencia dedunas arcillosas, limosas o limo-arcillosas. Morfologicamente, son dunas de tipo parabólico y otras con aspecto "cónico", "transverso" o "longitudinal", construidas por paleovientos efectivos que provenían del W y SW. Finalmente, se discute la edad y origen de estos complejos dunares.[Abstract] The dunes of the San Juan alluvial plain consists most characteristically of clayey, silty, and clayeysilty dunes, which morphologically are most commonly of parabolic type , but dome-shaped, transverse and linear dunes are present as well. These were built up by effective winds coming from the Wand SW. Finally, both the age and genesis of these dunes is discússed

Invasion of two widely separated areas of Mexico by Forficula auricularia (Dermaptera: Forficulidae)

Peer reviewe

Entre la vivienda principal y la secundaria: la movilidad residencial y su contribución a la calidad de vida de los jubilados madrileños

Mejorar las condiciones de vida de las personas mayores se ha convertido en un reto en las sociedades occidentales. Las personas cada vez viven más años, en mejores condiciones económicas y materiales, lo cual les permite viajar y cambiar más de lugar de residencia (de forma temporal o definitiva).Con esta aportación se pretende determinar qué elementos de la CdV están en la base de movilidad en personas de más edad y cómo la movilidad influye en la percepción global de la CdV. El objetivo es conocer qué ha supuesto la movilidad residencial en personas jubiladas y cómo ha influido en los distintos ámbitos/dimensiones de su vida.La metodología utilizada ha sido cualitativa y los resultados se han obtenido de la realización de veinte entrevista en profundidad a personas que han desarrollado movilidad tras su jubilación desde la ciudad de Madrid hacia otros lugares de España.Investigación realizada con financiación aportada por la Fundación Mapfre, y tambien en el marco del proyecto "Cambios residenciales, envejecimiento saludable y mejora de la calidad de vida en la vejez", financiado por el IMSERSO (Ref. 46/2006)Peer reviewe

Mapping Children's Discussions of Evidence in Science to Assess Collaboration and Argumentation

The research reported in this paper concerns the development of children's skills of interpreting and evaluating evidence in science. Previous studies have shown that school teaching often places limited emphasis on the development of these skills, which are necessary for children to engage in scientific debate and decision-making. The research, undertaken in the UK, involved four collaborative decision-making activities to stimulate group discussion, each was carried out with five groups of four children (10-11 years old). The research shows how the children evaluated evidence for possible choices and judged whether their evidence was sufficient to support a particular conclusion or the rejection of alternative conclusions. A mapping technique was developed to analyse the discussions and identify different "levels" of argumentation. The authors conclude that suitable collaborative activities that focus on the discussion of evidence can be developed to exercise children's ability to argue effectively in making decisions

Feature selection for chemical sensor arrays using mutual information

We address the problem of feature selection for classifying a diverse set of chemicals using an array of metal oxide sensors. Our aim is to evaluate a filter approach to feature selection with reference to previous work, which used a wrapper approach on the same data set, and established best features and upper bounds on classification performance. We selected feature sets that exhibit the maximal mutual information with the identity of the chemicals. The selected features closely match those found to perform well in the previous study using a wrapper approach to conduct an exhaustive search of all permitted feature combinations. By comparing the classification performance of support vector machines (using features selected by mutual information) with the performance observed in the previous study, we found that while our approach does not always give the maximum possible classification performance, it always selects features that achieve classification performance approaching the optimum obtained by exhaustive search. We performed further classification using the selected feature set with some common classifiers and found that, for the selected features, Bayesian Networks gave the best performance. Finally, we compared the observed classification performances with the performance of classifiers using randomly selected features. We found that the selected features consistently outperformed randomly selected features for all tested classifiers. The mutual information filter approach is therefore a computationally efficient method for selecting near optimal features for chemical sensor arrays

Analytic frameworks for assessing dialogic argumentation in online learning environments

Over the last decade, researchers have developed sophisticated online learning environments to support students engaging in argumentation. This review first considers the range of functionalities incorporated within these online environments. The review then presents five categories of analytic frameworks focusing on (1) formal argumentation structure, (2) normative quality, (3) nature and function of contributions within the dialog, (4) epistemic nature of reasoning, and (5) patterns and trajectories of participant interaction. Example analytic frameworks from each category are presented in detail rich enough to illustrate their nature and structure. This rich detail is intended to facilitate researchers’ identification of possible frameworks to draw upon in developing or adopting analytic methods for their own work. Each framework is applied to a shared segment of student dialog to facilitate this illustration and comparison process. Synthetic discussions of each category consider the frameworks in light of the underlying theoretical perspectives on argumentation, pedagogical goals, and online environmental structures. Ultimately the review underscores the diversity of perspectives represented in this research, the importance of clearly specifying theoretical and environmental commitments throughout the process of developing or adopting an analytic framework, and the role of analytic frameworks in the future development of online learning environments for argumentation

Investigación mineralógica de arenas de aluvión en la provincia de Cáceres (Ríos Búrdalo y Burdalillo)

Se han estudiado aluviones recogidos en los ríos Búrdalo y Burdalillo, afluentes del Guadiana, provincia de Cáceres, iniciándose con este trabajo una serie de investigación mineralógica de arenas de aluvión en la Península Ibérica. Por los resultados obtenidos del análisis mineralógico podemos definir estos aluviones como ilmeníticos

Argumentation in school science : Breaking the tradition of authoritative exposition through a pedagogy that promotes discussion and reasoning

The value of argumentation in science education has become internationally recognised and has been the subject of many research studies in recent years. Successful introduction of argumentation activities in learning contexts involves extending teaching goals beyond the understanding of facts and concepts, to include an emphasis on cognitive and metacognitive processes, epistemic criteria and reasoning. The authors focus on the difficulties inherent in shifting a tradition of teaching from one dominated by authoritative exposition to one that is more dialogic, involving small-group discussion based on tasks that stimulate argumentation. The paper builds on previous research on enhancing the quality of argument in school science, to focus on how argumentation activities have been designed, with appropriate strategies, resources and modelling, for pedagogical purposes. The paper analyses design frameworks, their contexts and lesson plans, to evaluate their potential for enhancing reasoning through foregrounding the processes of argumentation. Examples of classroom dialogue where teachers adopt the frameworks/plans are analysed to show how argumentation processes are scaffolded. The analysis shows that several layers of interpretation are needed and these layers need to be aligned for successful implementation. The analysis serves to highlight the potential and limitations of the design frameworks