1,819 research outputs found

    La lengua y la literatura españolas en los estudios de Magisterio (diez años después).

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    Sin resumenUnesco says that children shouldn't leave primary school without knowing how to express correctly, both orally and in writing, any thought in their mother tongue. In order to reach this aim. future teachers should be aware of the importance of the appropriate use of their own language both in the oral and written version. Teachers should also be aware of the importance of the knowledge and enjoyment of their national literature, as both language and literature are the pillar that supports the humane and humanistie training of educators. However, the prevailing syllabus does nol pay attention to this type of knowledge

    Gestión técnico económica 1995

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    Strong Coupling of a Single Photon to a Magnetic Vortex

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    Strong light-matter coupling means that cavity photons and other types of matter excitations are coherently exchanged. It is used to couple different qubits (matter) via a quantum bus (photons) or to communicate different types of excitations, e.g., transducing light into phonons or magnons. A, so far, unexplored interface is the coupling between light and topologically protected particle-like excitations as magnetic domain walls, skyrmions, or vortices. Here, we show theoretically that a single photon living in a superconducting cavity can be strongly coupled to the gyrotropic mode of a magnetic vortex in a nanodisc. We combine numerical and analytical calculations for a superconducting coplanar waveguide resonator and different realizations of the nanodisc (materials and sizes). We show that, for enhancing the coupling, constrictions fabricated in the resonator are crucial, allowing to reach strong coupling in CoFe discs of radius 200-400 nm having resonance frequencies of a few GHz. The strong coupling regime permits coherently exchanging a single photon and quanta of vortex gyration. Thus, our calculations show that the device proposed here serves as a transducer between photons and gyrating vortices, opening the way to complement superconducting qubits with topologically protected spin-excitations such as vortices or skyrmions. We finish by discussing potential applications in quantum data processing based on the exploitation of the vortex as a short-wavelength magnon emitter

    A Computational Complexity Theory in Membrane Computing

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    In this paper, a computational complexity theory within the framework of Membrane Computing is introduced. Polynomial complexity classes associated with di erent models of cell-like and tissue-like membrane systems are de ned and the most relevant results obtained so far are presented. Many attractive characterizations of P 6= NP conjecture within the framework of a bio-inspired and non-conventional computing model are deduced.Ministerio de Educación y Ciencia TIN2006-13425Junta de Andalucía P08–TIC-0420

    A P-Lingua Programming Environment for Membrane Computing

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    A new programming language for membrane computing, PLingua, is developed in this paper. This language is not designed for a speci c simulator software. On the contrary, its purpose is to o er a general syntactic framework that could de ne a uni ed standard for membrane computing, covering a broad variety of models. At the present stage, P-Lingua can only handle P systems with active membranes, although the authors intend to extend it to other models in the near future. P-Lingua allows to write programs in a friendly way, as its syntax is very close to standard scienti c notation, and parameterized expressions can be used as shorthand for sets of rules. There is a built-in compiler that parses these human-style programs and generates XML documents that can be given as input to simulation tools, di erent plugins can be designed to produce speci c adequate outputs for existing simulators. Furthermore, we present in this paper an integrated development environment that plays the role of interface where P-lingua programs can be written and compiled. We also present a simulator for the class of recognizer P systems with active membranes, and we illustrate it by following the writing, compiling and simulating processes with a family of P systems solving the SAT problem.Ministerio de Educación y Ciencia TIN2006-13425Junta de Andalucía TIC-58

    Efecto del tipo y cantidad de alúmina como dopante sobre la densificación y las propiedades eléctricas de electrodos cerámicos de óxido de zinc

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    [EN] Aluminum-doped zinc oxide (AZO) electrodes can be a good alternative to replace the expensive electrodes (Ti, ITO, FTO, etc.), which are used in the electrooxidation process to remove refractory and emergent contaminants from industrial wastewaters. AZO electrodes have been prepared by the traditional ceramic method using ZnO as the main raw material and different precursors of Al2O3 as dopant sources. Densification, microstructure and electric resistivity of AZO electrodes are a function of precursor's nature and sintering thermal treatment. The higher the number of precursor's particles and the smaller their size, the sintering temperature needed to attain high densifications and low resistivities shifted to higher values. Micrometric and colloidal alumina were the precursors which allowed to equilibrate an affordable sintering temperature interval (1200-1300 degrees C) with acceptable densification and resistivity values (around 95% and 5 x 10(-3) Omega cm, respectively). However, colloidal alumina made it possible to obtain slightly lower values of resistivity at the cost of having a narrower working interval.[ES] En este trabajo de investigación se presentan electrodos cerámicos de óxido de zinc dopado con aluminio (AZO) como alternativa a los actuales electrodos de titanio (ITO, FTO. . .) utilizados en el proceso de electrooxidación de aguas residuales para la eliminación de contaminantes refractarios y emergentes. Estos electrodos AZO han sido preparados mediante el método tradicional cerámico, utilizando ZnO como materia prima principal y diferentes precursores de Al2O3 como dopantes. La densificación, la microestructura y la resistividad eléctrica de estos electrodos son propiedades que están directamente relacionadas con la naturaleza del precursor y con eltratamiento térmico utilizado para su sinterización. Cuanto mayor es el número de partículas del precursor y menor es su tamano, ¿ la temperatura de sinterización necesaria para lograr altas densificaciones y bajas resistividades cambia a valores más altos. Fueron la alúmina micrométrica y la coloidal los dopantes que ofrecieron un buen equilibrio entre temperatura de sinterización (1.200¿1.300 ¿C) y densificación-resistividad (95% y 5·10¿3 cm, respectivamente). Concretamente en el caso de la alúmina coloidal, se pudieron optimizar estos resultados estrechando el intervalo de temperatura de trabajo.The authors thanks to"Ministerio de Economia y Competitividad" and "Fondo Europeo de Desarrollo Regional" the support to this research [Plan Nacional de I+D, project Ref. CTQ2015-65202-C2-2-R (MINECO/FEDER)].Sánchez-Rivera, M.; Orts, M.; Pérez-Herranz, V.; Mestre, S. (2021). Effect of type and amount of alumina as dopant over the densification and the electrical properties of zinc oxide ceramic electrodes. Boletín de la Sociedad Española de Cerámica y Vidrio. 60(1):53-61. https://doi.org/10.1016/j.bsecv.2020.01.003536160

    Maternal warmth and early adolescents' internalizing symptoms and externalizing behavior: Mediation via emotional security

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    This study examines the relation between maternal warmth and the internalizing and externalizing problems of early adolescents, and the potential mediation of this relation by emotional insecurity. The hypotheses for the study derive from Cummings and Davies (1995) theory of emotional security. The current study extends the theory to security processes within the parent-adolescent relationship. A total of 203 early adolescents drawn from school samples in Spain participated in the study along with their mothers and their classroom teachers. The results supported the hypothesis. Emotional insecurity mediated the relationship between maternal warmth and adolescent internalizing and externalizing problems. Higher maternal warmth was linked to greater emotional security, which in turn was linked to fewer internalizing and externalizing problems. The findings extend the tenets of Emotional Security Theory and imply strategies for prevention and intervention
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