Finite-size effects in hyperuniform vortex matter.

Novel hyperuniform materials are emerging as an active field of applied and basic research since they can be designed to have exceptional physical properties. This ubiquitous state of matter presents a hidden order that is characterized by the density of constituents of the system being uniform at large scales, as in a perfect crystal, although they can be isotropic and disordered like a liquid. In the quest for synthesizing hyperuniform materials in experimental conditions, the impact of finite-size effects remains as an open question to be addressed. We use vortex matter in type-II superconductors as a toy model system to study this issue. We previously reported that vortex matter nucleated in samples with point disorder is effectively hyperuniform and thus presents the interesting physical properties inherent to hyperuniform systems. In this work we present experimental evidence that on decreasing the thickness of the vortex system its hyperuniform order is depleted. By means of hydrodynamic arguments we show that the experimentally observed depletion can be associated to two crossovers that we describe within a hydrodynamic approximation. The first crossover length is thickness-dependent and separates a class-II hyperuniform regime at intermediate lengthscales from a regime that can become asymptotically non-hyperuniform for large wavelengths in very thin samples. The second crossover takes place at smaller lengthscales and marks the onset of a faster increase of density fluctuations due to the dispersivity of the elastic constants. Our work points to a novel mechanism of emerging hyperuniformity controlled by the thickness of the host sample, an issue that has to be taken into account when growing hyperuniform structures for technological applications.

Non-Gaussian tail in the force distribution: a hallmark of correlated disorder in the host media of elastic objects.

Inferring the nature of disorder in the media where elastic objects are nucleated is of crucial importance for many applications but remains a challenging basic-science problem. Here we propose a method to discern whether weak-point or strong-correlated disorder dominates based on characterizing the distribution of the interaction forces between objects mapped in large fields-of-view. We illustrate our proposal with the case-study system of vortex structures nucleated in type-II superconductors with different pinning landscapes. Interaction force distributions are computed from individual vortex positions imaged in thousands-vortices fields-of-view in a two-orders-of-magnitude-wide vortex-density range. Vortex structures nucleated in point-disordered media present Gaussian distributions of the interaction force components. In contrast, if the media have dilute and randomly-distributed correlated disorder, these distributions present non-Gaussian algebraically-decaying tails for large force magnitudes. We propose that detecting this deviation from the Gaussian behavior is a fingerprint of strong disorder, in our case originated from a dilute distribution of correlated pinning centers.

Asistencia tutorial: el rendimiento académico desde la percepción de los alumnos / Tutorial action: academic performance of the medical nursery students

El artículo describe la acción tutorial implementada durante la experiencia clínica en alumnos de Enfermería Médica que lograron su promoción. Se analizaron aspectos de las siguientes categorías didácticas: alumnos, estrategias docentes, competencias profesionales, escenarios educativos y la comunicación como enlace en la integración docencia-servicio

Asistencia tutorial: el rendimiento académico desde la percepción de los alumnos / Tutorial action: academic performance of the medical nursery students

El artículo describe la acción tutorial implementada durante la experiencia clínica en alumnos de Enfermería Médica que lograron su promoción. Se analizaron aspectos de las siguientes categorías didácticas: alumnos, estrategias docentes, competencias profesionales, escenarios educativos y la comunicación como enlace en la integración docencia-servicio (AU)

Estrategias metodológicas docentes que favorecen el aprendizaje autónomo en enfermería / Teachers' methodological strategies favouring autonomous learning in nursing

El artículo describe las propuestas didácticas usadas por los docentes de la Carrera Licenciatura en Enfermería que favorecen el aprendizaje autónomo en la profesión, identificando razones que motivan su implementación

Estrategias metodológicas docentes que favorecen el aprendizaje autónomo en enfermería / Teachers methodological strategies favouring autonomous learning in nursing

El artículo describe las propuestas didácticas usadas por los docentes de la Carrera Licenciatura en Enfermería que favorecen el aprendizaje autónomo en la profesión, identificando razones que motivan su implementación (AU)