Search results for " Elementary"
showing 10 items of 110 documents
A ATIVIDADE FÍSICA REPRESENTADA NOS LIVROS DIDÁTICOS DA EDUCAÇÃO FÍSICA NA EDUCAÇÃO PRIMÀRIA
2019
El objetivo de este estudio es analizar la representación de la actividad física que aparece en los libros de texto de Educación Física y su relación con los diferentes bloques de contenidos del área, en Educación Primaria. La muestra estuvo formada por un total de 3836 imágenes publicadas en 34 libros de texto pertenecientes a seis editoriales españolas, entre 2006 y 2013. La técnica de investigación fue el análisis de contenido mediante la herramienta SAIMEF. Para el análisis estadístico se utilizó el software SPSS 22.0. Los resultados muestran un claro predominio del bloque de contenidos de los “juegos y actividades deportivas”. Este desequilibrio en la representación de los bloques no r…
Study of elementary reactions with the hades dielectron spectrometer
2010
Results obtained with the HADES dielectron spectrometer at GSI are discussed, with emphasis on dilepton production in elementary reactions. Díaz Medina, José, Jose.Diaz@uv.es ; Gil Ortiz, Alejandro, Alejandro.Gil@ific.uv.es
Dyscalculia: Clinical manifestations, evaluation and diagnosis. Current Perspectives of educational intervention
2019
Learning difficulties and learning disorders are very frequent in schools nowadays, and they have been increasing in the field of mathematics. Such difficulties tend to be associated with other disorders such as dyslexia or Attention Deficit Hyperactivity Disorder (ADHD). The present article aims at deepening our understanding, definition and detection of dyscalculia, along with reviewing current educational treatments. Since 1990, concerns about learning difficulties in the classroom have been made explicit in policies such as the Spanish Law on the General Ordering of the Education System (LOGSE). Likewise, the indicators, symptoms, and prevalence of dyscalculia have been gathered since t…
Thought and Body. An activity of Logic in primary school
2015
Abstract In the recent decades, the pedagogical debate has been formerly traversed by the emergence an then by the assertion of a matured awareness on the importance of the psychomotor skills in the educational-didactic path. The interpretive bio-psycho-social matrix has today become one of the pivotal points on which the educational-didactic activity rests and develops for the training of child's personality in its full motor, mental, perceptual, emotional, sensory development. Pedagogues, educators, and training professionals are increasingly confident that, since the birth, children are sensitive to the stimuli and to the environmental intervention, therefore it's essential to know their…
Micromechanical modeling of MXene-polymer composites
2020
Polymer composites are considered among the most promising materials for functional and structural applications. Improvement of mechanical properties of polymer composites using nanomaterials has generated much interest in recent years. This study aimed to predict the tensile strength and determine the damage mechanism of MXene-polyvinyl alcohol and MXene-epoxy composites. All parameters such as particle size, mechanical properties and interface layer strength were calibrated by finite element modeling with respect to experimental results. The influence of aspect ratio, volume fraction and MXene flake alignment on final mechanical properties of representative volume element models were inve…
Quantifiable analysis of the failure of advanced carbon fibre composite structures leading to improved safety factors
2022
Abstract The increasing use of advanced composite materials means that they must now be considered as major materials for a wide variety of structures some of which will be in service for decades. There is therefore an important need to be able to quantify damage accumulation leading to failure in these materials particularly as they are often used in extreme situations for which failure must be avoided. This review shows how damage accumulation in many major composite structures is dominated by fibre failure but that the viscoelastic nature of the matrix induces time effects including delayed failure. It is shown that damage accumulation can be quantitatively modelled using a multi-scale a…
Micro-cracking of brittle polycrystalline materials with initial damage
2016
In this paper, the effect of pre-existing damage on brittle micro-cracking of polycrystalline materials is explored. The behaviour of single and multiple cracks randomly distributed within a grain scale polycrystalline aggregate is investigated using a recently developed grain boundary 3D computational framework. Each grain is modelled as a single crystal anisotropic domain. Opening, sliding and/or contact at grain boundaries are modelled using nonlinear cohesive-frictional laws. The polycrystalline micro-morphologies are generated using Voronoi tessellation algorithms in combination with a regularisation scheme to avoid the presence of unnecessary small geometrical entities (edges and face…
H2 Transformations on Graphene Supported Palladium Cluster: DFT-MD Simulations and NEB Calculations
2020
Molecular dynamics simulations based on density functional theory were employed to investigate the fate of a hydrogen molecule shot with different kinetic energy toward a hydrogenated palladium cluster anchored on the vacant site of a defective graphene sheet. Hits resulting in H2 adsorption occur until the cluster is fully saturated. The influence of H content over Pd with respect to atomic hydrogen spillover onto graphene was investigated. Calculated energy barriers of ca. 1.6 eV for H-spillover suggest that the investigated Pd/graphene system is a good candidate for hydrogen storage.
Ricerca educativa in ambienti multiculturali con allievi cinesi: la lingua scritta come ponte per un avvio informale al pensiero algebrico-relazionale
2017
Il contributo, evidenziando l’attuale proble- matica didattica relativa alla multiculturalità nel panorama scolastico nazionale, discute alcuni aspetti chiave della cultura cinese, uti- li ad interpretare il perché di particolari competenze algebriche, evidenziate negli allievi di area confuciana dagli insegnanti di tutti i gradi scolastici, coerenti con le valuta- zioni internazionali PISA e TIMMS. Con questo scopo, il lavoro propone nello specifico una riflessione epistemologica del rapporto tra lingua scritta cinese e avvia- mento informale al pensiero algebrico-rela- zionale e discute i dati sperimentali (di tipo implicativo) di una ricerca-azione condotta in classi di Scuola Primaria c…
Dielectron production in proton-proton and proton-lead collisions at √sNN=5.02TeV
2020
The first measurements of dielectron production at midrapidity (|ηe| < 0.8) in proton–proton and proton–lead collisions at √sNN = 5.02 TeV at the LHC are presented. The dielectron cross section is measured with the ALICE detector as a function of the invariant mass mee and the pair transverse momentum pT, ee in the ranges mee < 3.5 GeV/c2 and pT, ee < 8 GeV/c, in both collision systems. In proton–proton collisions, the charm and beauty cross sections are determined at midrapidity from a fit to the data with two different event generators. This complements the existing dielectron measurements performed at √s = 7 and 13 TeV. The slope of the √s dependence of the three measurements is…