Theoretical approaches in investigation for the integration digital technology in mathematics education

Esta contribución pretende dar a conocer una síntesis de algunos enfoques teóricos que se usan hoy en la investigación en educación matemática para la integración de la tecnología digital en la enseñanza y el aprendizaje. Se abordarán los antecedentes y los conceptos centrales de los cuatro enfoques que se presentan: Aproximación Instrumental, Mediación Semiótica, Orquestación Instrumental y Sereshumanos-con-medios.This contribution expects to provide an outline of some theoretical approaches that are used nowadays in research on mathematics education for the integration of digital technology in teaching and learning. Will address the background and the core concepts of the four approaches presented: Instrumental Approach, Semiotic Mediation, Instrumental Orchestration and Humans-with-media.Fil: Pérez Medina, Carlos Roberto. Universidad Nacional de Cordoba. Facultad de Filosofia y Humanidades; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Prácticas matemáticas con SGD desarrolladas en la resolución de problemas sobre congruencia de triángulos desde una mirada instrumental: reporte de un caso

Presentamos parte de los resultados del trabajo de investigación de la tesis doctoral. Prácticas matemáticas y razonamientos con SGD que emergen de la génesis instrumental en la resolución de problemas sobre semejanza y congruencia de triángulos en AGD. Específicamente lo concerniente al concepto de práctica matemática con SGD para el contenido de congruencia, de uno de los tres casos analizados en el estudio desde una perspectiva cualitativa. Consideramos que este trabajo constituye un aporte al área de la didáctica de la matemática, en tanto contribuye a la reflexión sobre el potencial del uso de las herramientas de tecnología digital de tipo SGD para el desempeño del profesor en un aula de clase instrumentada con este tipo particular de tecnología, la intención de mejorar su enseñanza y los efectos positivos que se esperan en el aprendizaje de los alumnos.Facultad de Humanidades y Ciencias de la Educació

Confinement orientation effects in S/D tunneling

The most extensive research of scaled electronic devices involves the inclusion of quantum effects in the transport direction as transistor dimensions approach nanometer scales. Moreover, it is necessary to study how these mechanisms affect different transistor architectures to determine which one can be the best candidate to implement future nodes. This work implements Source-to-Drain Tunneling mechanism (S/D tunneling) in a Multi-Subband Ensemble Monte Carlo (MS-EMC) simulator showing the modification in the distribution of the electrons in the subbands, and, consequently, in the potential profile due to different confinement direction between DGSOIs and FinFETs.Spanish Ministry of Science and Innovation (TEC2014-59730-R), H2020 - REMINDER (687931), and H2020 - WAYTOGO-FAST (662175

Arrested dynamics of the dipolar hard-sphere model

We report the combined results of molecular dynamics simulations and theoretical calculations concerning various dynamical arrest transitions in a model system representing a dipolar fluid, namely, N (softcore) rigid spheres interacting through a truncated dipole-dipole potential. By exploring different regimes of concentration and temperature, we find three distinct scenarios for the slowing down of the dynamics of the translational and orientational degrees of freedom: At low ({$\eta$} = 0.2) and intermediate (${\eta}$ = 0.4) volume fractions, both dynamics are strongly coupled and become simultaneously arrested upon cooling. At high concentrations ({$\eta$} $\lt$ 0.6), the translational dynamics shows the features of an ordinary glass transition, either by compressing or cooling down the system, but with the orientations remaining ergodic, thus indicating the existence of partially arrested states. In this density regime, but at lower temperatures, the relaxation of the orientational dynamics also freezes. The physical scenario provided by the simulations is discussed and compared against results obtained with the self-consistent generalized Langevin equation theory, and both provide a consistent description of the dynamical arrest transitions in the system. Our results are summarized in an arrested states diagram which qualitatively organizes the simulation data and provides a generic picture of the glass transitions of a dipolar fluid

Study of the thermal behavior of the aluminium dust stabilized with gypsum

[ES]El polvo de aluminio (pAl) es un residuo peligroso procedente de la metalurgia secundaría del aluminio. Con objeto de reducir la reactividad del mismo, en el CENIM se ha desarrollado un proceso de estabilización/solidificación mediante su fraguado con yeso. En este trabajo se presenta el estudio del comportamiento térmico del pAl estabilizado con el yeso, con el fin de establecer la influencia del residuo en las reacciones de hidratación/deshidratación del yeso durante el proceso del fraguado, a saber: deshidratación parcial del sulfato calcico dihidrato, deshidratación del hemihidrato, deshidratación del hidróxido de aluminio y transformación de anhidrita soluble en anhidrita insoluble. Asimismo se ha estudiado la cinética asociada a cada una de las reacciones anteriormente mencionadas mediante Calorimetría Diferencial de Barrido.[EN]The aluminium dust is a hazardous waste from the secondary aluminium remelting industry. A stabilization/solidification process was developed at CENIM with the aim of decreasing its reactivity. Gypsum was used as a binder material. Tliis work summarizes the study of the thermal behavior of the aluminium dust stabilized with gypsum, in order to establish the influence of the residue in the reactions of hydration/dehydration of the gypsum during the hardening process, namely: partial dehydration of calcium sulphate dihydrate, dehydration of calcium sulphate hemi'hydrate, dehydration of aluminium hydroxide and anhydrite soluble/anhydrite insoluble transformation. The activation energy associated to all those reactions was determined by Differential Scanning Calorimetry.Los autores agradecen a la Consejería de Educación de la Comunidad de Madrid la financiación del proyecto (07M/0136/2000) y a la empresa Recuperación y Reciclaje Román por el apoyo a esta investigación.Peer reviewe

A thorough study of Si nanowire FETs with 3D Multi-Subband Ensemble Monte Carlo simulations

We thoroughly compare the DC electrical behavior of n-MOS transistors based on Si nanowires with 〈 1 0 0 〉 and 〈 1 1 0 〉 channel orientations by means of Multi-Subband Ensemble Monte Carlo simulations. We find that the drain current depends on the nanowire diameter and it is slightly, but consistently, larger for 〈 1 0 0 〉 than for 〈 1 1 0 〉 nanowires. The observed differences in mobility, velocity and spatial charge distribution are interpreted in terms of the effective masses and populations of the different Si conduction band valleys, whose sixfold degeneracy is lifted by quantum confinement in narrow nanowires. Finally, we study the scaling behavior for channel lengths down to 8 nm, concluding that the differences observed between orientations are minimal