263 research outputs found
Historias conmovedoras
No full textAntepContén : La calavera ; Luisa Foubert ; La sotana nueva ; Atkinta ; Los soldados de Cristo ; La noche del 13 de setiembr
Effect of Mn-site doping on the magnetotransport properties of the colossal magnetoresistance compound La2/3Ca1/3Mn1-xAxO3 (A=Co, Cr; x≤0.1)
No full textIn this paper we show the effect of Mn site substitution (≤10%) by Co and Cr on the magnetotransport properties of ceramic samples of La2/3Ca1/3MnO3. Resistivity, magnetization, and magnetoresistance were systematically investigated as a function of doping. An increase in resistivity and a diminution of metal-insulator transition and Curie temperatures was observed as a consequence of both Co and Cr doping. The evolution of the number of neighbors ferromagnetically coupled to Mn was studied in each sample, and the results suggest some degree of ferromagnetic coupling between Cr3+ and Mn ions. Implications of both ferromagnetic Cr 3+-O-Mn3+ superexchange and double exchange interactions are discussed. We also found the existence of an optimum doping level that enhances colossal magnetoresistance. This has been explained considering electron localization due to magnetic disorder induced by doping in the Mn site.Fil: Rivadulla, F.. Universidad de Santiago de Compostela; EspañaFil: López Quintela, M. A.. Universidad de Santiago de Compostela; EspañaFil: Hueso, Luis E.. Universidad de Santiago de Compostela; EspañaFil: Sande, P.. Universidad de Santiago de Compostela; EspañaFil: Rivas, J.. Universidad de Santiago de Compostela; EspañaFil: Sanchez, Rodolfo Daniel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
“Aínda non naceramos, mais lembramos”: Vanesa Sotelo e Esther F. Carrodeguas, dramaturgas da memoria e a identidade
No full textVanesa Sotelo and Esther F. Carrodeguas are two of the most outstanding representatives of the generation of creators that appears in Galician drama scene at the beginning of the 21st century. Their respective trajectories present analogies and points of contact with other Iberian theatre systems yet to be explored. Likewise, their productions present interesting elements in common, among which the constant dramatic treatment of memory and identity stand out. In this article we will explore the approach to such themes through four of their plays: Nome: Bonita and A lúa vai encuberta by Sotelo, Voaxa and Carmín and Iribarne by Carrodeguas.Vanesa Sotelo e Esther F. Carrodeguas son dúas das máis destacadas representantes da xeración de creadoras que irrompe na dramaturxia galega nos albores do século XXI. As súas respectivas traxectorias revelan analoxías e puntos de contacto con outros sistemas teatrais ibéricos pendentes de explorar. Igualmente, as súas producións presentan interesantes elementos en común, entre os que destacan o constante tratamento dramático da memoria e a identidade. Neste traballo exploraremos a abordaxe de tales temas a través de catro obras da súa autoría: Nome: Bonita e A lúa vai encuberta de Sotelo e Voaxa e Carmín e Iribarne de Carrodeguas
Precisiones sobre la <i>estrategia</i> tropológica en ciencia
No full textThe aim of this paper is to contribute to answering the question of whether it has any sense to talk about a tropological strategy in science. To do this it is necessary to scrutinize the different relationships among models, metaphors and analogies. After expounding some strong realist doctrines, and further moderate ones as well, about the truth value of metaphors in science, I proceed to undertake some precisions connected with certain current approaches on the relationships between analogies and models, and between models and metaphors. For instance, whether analogy is the ground of modelling, or if models constitute a certain form of metaphor. From the analysis of these questions I draw some detailed conclusions that allow me to claim that it is not justified to think about the existence of a deliberate tropological strategy in science.El objeto de este trabajo es contribuir a determinar si tiene sentido hablar de una estrategia tropológica en ciencia. Para ello se hace necesario escudriñar las formas de relaciones entre modelos, metáforas y analogías. Tras exponer determinados planteamientos realistas fuertes, y también otros moderados, acerca del valor de verdad de las metáforas en ciencia, paso a matizar algunas posiciones, frecuentes entre filósofos contemporáneos, sobre las relaciones entre analogías y modelos, y entre modelos y metáforas, tales como si la analogía es la base de la modelización, o si los modelos son una forma de metáfora. De los análisis de estas cuestiones, y de las conclusiones detalladas que extraigo, se desprende que carece de fundamento pensar en la existencia deliberada de una estrategia tropológica en ciencia
Oxygen vacancies in strained <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> thin films: Formation enthalpy and manipulation
No full textWe report the enthalpy of oxygen vacancy formation in thin films of electron-doped SrTiO3, under different degrees of epitaxial stress. We demonstrate that both compressive and tensile strain decrease this energy at a very similar rate and promote the formation of stable doubly ionized oxygen vacancies. Moreover, we also show that unintentional cationic vacancies introduced under typical growth conditions, produce a characteristic rotation pattern of TiO6 octahedra. The local concentration of oxygen vacancies can be modulated by an electric field with an AFM tip, changing not only the local electrical potential but also producing a nonvolatile mechanical response whose sign (up/down) can be reversed by the electric field
Conduction-electron spin resonance and spin-density fluctuations of CoS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>x</mml:mi><mml:mo>≤</mml:mo><mml:mn>0.1</mml:mn></mml:mrow></mml:math>)
No full textLiterary representation of memory and consequences of the transition to democracy in post-Franco Galician society: a study of the novel O tempo en ningunha parte, by Xosé Manuel Martínez Oca
No full text[Resumo] O presente traballo sitúase nunha das interseccións entre o ámbito dos estudos literarios e os estudos da memoria cultural e toma como obxecto de estudo a novela galega O tempo en ningunha parte (2003), de Xosé Manuel Martínez Oca, publicada no contexto do boom memorialista que se desenvolve en España a partir do 2000. A través do estudo da representación literaria da memoria ou «mímese de memoria» na novela, pretendemos comprender os procesos e dinámicas culturais que o recordo da guerra civil e o franquismo provocou na sociedade de 1985, ben como o discurso que a novela emite no debate contemporáneo sobre o pasado que ten lugar na esfera pública. O tempo en ningunha parte reflicte as consecuencias das políticas de esquecemento da Transición a través do silencio sobre o pasado que envolve toda a trama de investigación. Ao tempo, a novela propón unha lectura crítica do proceso de democratización en Galiza e no conxunto do Estado español. Mediante a mímese de memoria, o autor adianta os conflitos pola memoria que se desenvolverán en España desde o 2000 e posiciónase de forma clara e crítica co discurso que proxecta no propio debate público sobre a interpretación e xestión do pasado traumático recente.[Abstract] The present work is situated at the intersection between literary studies and cultural memory studies. The object of the study is O tempo en ningunha parte (2003), a Galician novel written by Xosé Manuel Martínez Oca. It was published in the context of the memory boom in Spain since the year 2000. The literary representation of memory, or "mimesis of memory", will be studied in the novel in order to understand the processes and cultural dynamics of the memory of the Spanish Civil War and Francoism in the society of 1985. O tempo en ningunha parte reflects the consequences of the politics of forgetting in the Spanish transition to democracy in the silence about the past that involves a detective plot. In addition, the novel proposes a critical interpretation of the process of democratization in Galicia and in the whole of Spain. With the use of "mimesis of memory", the author advances the memory conflicts that will take place in Spain from 2000. The author takes sides in the public debate on the interpretation and management of the recent traumatic past
Metal-insulator transition and magnetic properties of La(1-x)Eu(x)NiO3 (0 ≤ x ≤ 1)
No full textThis paper reports X-ray diffraction patterns, Rietveld fit profiles, electrical resistivity dc magnetic susceptibility, and electron paramagnetic resonance (EPR) measurements of La(1-x)EU(x)NiO3 (0 ≤ x ≤ 1). A shift to high temperature of the metal-insulator transition temperature with x and hysteresis in the electrical resistivity and magnetization versus temperature at intermediate concentration of the compound are observed. The antiferromagnetic order of the Ni sublattice can be observed after subtracting the magnetic contribution of the rare earth ions. A change in space group from R-3c to Pbnm for x ≥ 0.4 was detected, as was the appearance of magnetic order. Samples with 1% Gd3+ probe were studied by EPR. Drastic changes were observed in the shape of the lines with x, though the crystal field symmetry of the Gd sites remained constant in all the samples studied. We observed that when Eu substitution increases, the number of Gd ions that contribute to the crystal-field spectrum diminishes. A possible cause of this effect is a previously reported increase in the Ni-O covalence in the neighborhood of the Eu sites.Fil: Sanchez, Rodolfo Daniel. Universidad Nacional de Cuyo; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Causa, Maria Teresa Beatriz. Universidad Nacional de Cuyo; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Seoane, A.. Universidad de Santiago de Compostela; EspañaFil: Rivas, J.. Universidad de Santiago de Compostela; EspañaFil: Rivadulla, F.. Universidad de Santiago de Compostela; EspañaFil: López Quintela, M. A.. Universidad de Santiago de Compostela; EspañaFil: Pérez Cacho, J. J.. Universidad de Zaragoza; EspañaFil: Blasco, J.. Universidad de Zaragoza; EspañaFil: García, J.. Universidad de Zaragoza; Españ
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