Réplica a la ponencia "adoptando diferentes perspectivas de investigación sobre el concepto de derivada"

En esta réplica a la ponencia presentada por la profesora Sánchez-Matamoros, y después de unas consideraciones personales, se destaca su trayectoria investigadora centrada en analizar la comprensión del concepto de derivada abarcando los ámbitos de aprendizaje (en alumnos de secundaria) y de enseñanza (en futuros profesores de matemáticas). Se señalan sus aportaciones en el marco de la teoría APOE reflejadas en numerosas publicaciones y su aplicación al campo de la formación de profesores

Ultra High Resolution Transmission Electron Microscopy of Matrix Mineral Grains in CM Chondrites: Preaccretionary or Parent Body Aqueous Processing?

CM chondrites are highly hydrated meteorites associated with a parent asteroid that has experienced significant aqueous processing. The meteoritic evidence indicates that these non-differentiated asteroids are formed by fine-grained minerals embedded in a nanometric matrix that preserves chemical clues of the forming environment. So far there are two hypothesis to explain the presence of hydrated minerals in the content of CM chondrites: one is based on textural features in chondrule-rim boundaries [1-3], and the other ‘preaccretionary’ hypothesis proposes the incorporation of hydrated phases from the protoplanetary disk [4-6]. The highly porous structure of these chondrites is inherited from the diverse materials present in the protoplanetary disk environment. These bodies were presumably formed by low relative velocity encounters that led to the accretion of silicate-rich chondrules, refractory Ca- and Al-rich inclusions (CAIs), metal grains, and the fine-grained materials forming the matrix. Owing to the presence of significant terrestrial water in meteorite finds [7], here we have focused on two CM chondrite falls with minimal terrestrial processing: Murchison and Cold Bokkeveld. Anhydrous carbonaceous chondrite matrices are usually represented by highly chemically unequilibrated samples that contain distinguishable stellar grains. Other chondrites have experienced hydration and chemical homogeneization that reveal parent body processes. We have studied CM chondrites because these meteorites have experienced variable hydration levels [8-10]. It is important to study the textural effects of aqueous alteration in the main minerals to decipher which steps and environments promote bulk chemistry changes, and create the distinctive alteration products. It is thought that aqueous alteration has particularly played a key role in modifying primordial bulk chemistry, and homogenizing the isotopic content of fine-grained matrix materials [7, 11, 12]. Fortunately, the mineralogy produced by parent-body and terrestrial aqueous alteration processes is distinctive [5, 11]

Antropología “a coste cero” pero Antropología todavía. Presentación del volumen monográfico: Antropología, Globalización y Prácticas Etnográficas

This paper is the introduction to the monographic issue Anthropology, globalization and ethnographic practices. It is organized in two main sections which explore the context, objectives and orientation of the special number, as well as each contribution in detail. Using a wide and open definition of globalization, the contributions to this issue can be organized in two main sections: the ones that pay special attention to the vectors and socio-spatial impacts of globalization as an economic, political and technological process; and those papers which urge to articulate alternatives to hegemonic globalization and that do so by using an anthropological knowledge and practice.Este texto es la introducción y presentación del volumen monográfico Antropología, globalización y prácticas etnográficas. Está organizado en dos grandes secciones en las que se presenta, por una parte, el contexto, los objetivos y la orientación con la que nace este número, y por otra parte, cada una de las contribuciones que lo conforman. Utilizando una aproximación muy amplia y abierta del concepto de globalización, estas contribuciones se pueden organizar en dos grandes bloques. Por un lado, aquellas que prestan una atención especial a los vectores e impactos socio-espaciales de la globalización entendida como proceso económico, político y tecnológico; y por otro lado, las que plantean la necesidad de articular alternativas a la globalización hegemónica utilizando para ello el conocimiento y las prácticas antropológicas

La coronación de la Virgen en la escultura de los tímpanos góticos españoles.

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