Search results for "second"
showing 10 items of 3671 documents
Nonlinear Disorder Mapping Through Three-Wave Mixing
2010
We implement a simple and powerful approach to characterize the domain distribution in the bulk of quadratic ferroelectric crystals via far-field second-harmonic spectroscopy. The approach is demonstrated in a lithium tantalate sample with periodic electric field poling and random mark-to-space ratio.
Supercontinuum Generation and Intermodal Four-Wave Mixing in a Step-Index Few-Mode Fibre
2019
International audience; The complex spatiotemporal dynamics of nonlinear light propagation in multimode fibers (MMFs) has recently witnessed a renewed interest because of their experimental realization in emerging key areas of laser physics and fiber optics [1]. Specifically, MMFs have a number of linear and nonlinear optical properties that make them very attractive to investigate new spatiotemporal effects fundamentally different from standard single-mode fibers. These include the observation of multimode solitons [2], intermodal four-wave mixing (FWM) [3], geometric parametric instabilities [4], spatial beam self-cleaning [5], and the generation of supercontinuum (SC) light when pumping …
Investigating the professional agency of secondary school English teachers in South Korea
2020
This qualitative study examines the professional agency of secondary English teachers in Midwestern South Korea. Specifically, it investigates how secondary English teachers in South Korea understand their professional agency and what mediates their professional agency. The ecological approach in this study recognises that agency encompasses both individual and environmental dimensions and is formed through the constant interplay between the individual and the environment. The dataset for this study comprises 15 semi-structured interviews with secondary English teachers in South Korea. The thematic analysis highlights a significant gap between Korean English teachers’ espoused agency and re…
Finnish Secondary Students’ Mental Models of Magnetism
2020
We examined Finnish lower secondary students’ mental models of magnetism through their drawings, written explanations and interviews. Secondary students in Finland (N=12) engaged in six lessons designed specifically to target three key concepts in understanding magnetism: structure and organization (magnetic domains), magnetic fields and magnetic interactions. We describe how, with a finite number of key concepts introduced, students reflected upon and revised their mental models of magnetism and magnetic interactions towards more sophisticated and normative scientific views. We found two new categories of students’ models: the pole model and pole/field model. The critical moments in evolvi…
Emerging Constructions in the L2 Italian Spoken by Low Literate Migrants
2019
The emergence of autonomous interlanguage constructions is widely recognised in the literature on L2 Italian. These constructions involve the overgeneralisation of functional forms learners are in the process of acquiring, e.g., siamo in siamo mangiare &lsquo
All-Possible-Couplings Approach to Measuring Probabilistic Context.
2013
From behavioral sciences to biology to quantum mechanics, one encounters situations where (i) a system outputs several random variables in response to several inputs, (ii) for each of these responses only some of the inputs may "directly" influence them, but (iii) other inputs provide a "context" for this response by influencing its probabilistic relations to other responses. These contextual influences are very different, say, in classical kinetic theory and in the entanglement paradigm of quantum mechanics, which are traditionally interpreted as representing different forms of physical determinism. One can mathematically construct systems with other types of contextuality, whether or not …
Finnish Adolescent Girls’ Activity Patterns and The Effects of an Activity-Based Homework Intervention on Their Physical Activity
2021
Purpose: The insufficient physical activity (PA) of adolescents is a global challenge, and there is a need to find opportunities to engage youth in active lifestyles. The majority of adolescents do not meet the recommended guidelines of physical activity, and especially females have low levels of activity as they approach adolescence. The goal of this study was to obtain insight into Finnish adolescent girls’ objectively measured physical activity by evaluating the effects of an activity-based homework intervention on low, medium, and high-active girls during after-school hours. Method: A physical activity homework intervention was put into place for female adolescent girls. Physical activi…
Ansiedad ante las ciencias y pruebas de evaluación científicas: efectos del nivel académico y género
2019
Resumen En este trabajo se hace una primera aproximación a la ansiedad de los estudiantes de secundaria ante las ciencias. Se han aplicado a 175 estudiantes de educación secundaria de diferentes cursos dos cuestionarios validados y una prueba de evaluación de competencias científicas. Un cuestionario mide la ansiedad ante diversos contextos científicos y el otro evalúa la ansiedad generada por una prueba de evaluación de ciencias. El análisis de los resultados obtenidos por medio de pruebas Anova evidencia que: a) la ansiedad ante situaciones científicas es mayor que en otras situaciones y disminuye significativamente con el aumento del nivel académico; b) la ansiedad generada en la prueba …
Estrategias docentes digitales: una aproximación desde la Didáctica
2019
espanolLa sociedad actual, caracterizada por el impacto de la tecnologia en los diferentes ambitos de la vida cotidiana, construye nuevas formas de hacer, de vivir, de ser, de interactuar, de conocer y de aprender. En este contexto, la escuela no queda al margen de este proceso de cambio e innovacion y se requiere de la puesta en practica de estrategias didacticas digitales para atender a las caracteristicas y demandas del alumnado que escolariza. Sobre ello y, a partir de los resumenes de los articulos que componen el monografico, se realiza un analisis de contenido que ha permitido identificar las palabras de uso frecuente en el ambito analizado, empleando la herramienta Atlas.ti.8 para l…