Search results for "PLE"
showing 10 items of 22773 documents
Dal formato cartaceo al formato digitale: uno studio qualitativo di test di matematica
Ricerca e clinica. Questioni epistemologiche e metodologiche.
2008
Care Poverty
2022
Implementation of Digital Portfolios in Early Childhood Education
2019
Curricula, influenced by the digitalization, set requirements for early childhood education (ECE) settings to implement digital practices. However, ECE teachers are struggling to integrate information and communication technology (ICT) and child-centered pedagogy, such as digital portfolios, successfully into practice. Previous research efforts have focused on analyzing the barriers of digital technology implementation. This study, in turn, takes a broader view and addresses the complex task of implementing digital practices into education by analyzing the factors that foster and challenge the implementation process. The results show that human related factors are considered the most foster…
Efecto inmediato del ejercicio sobre la variabilidad de la frecuencia cardíaca en personas con tetraplejia
2011
Objetivos: Analizar la variabilidad de la frecuencia cardíaca (VFC) en personas con tetraplejia y ver qué diferencias existen entre su respuesta en reposo y durante la recuperación tras la realización de ejercicio físico. Así mismo, se pretende comprobar las diferencias en VFC debidas a la propia lesión medular (LM), comparando su respuesta cardíaca con personas sin LM. Método: Se estudiaron 18 participantes, 9 de ellos con tetraplejia de origen traumático con niveles de lesión entre C5 y C7, y otros 9 sin lesión medular. Se midieron variables de VFC (RRi, SDNN, RMSSD, HF, LF, LF/HF) en tres momentos diferentes, (reposo, a los 5 min tras el ejercicio y a los 10 min tras el ejercicio) y se c…
Variational principle and bifurcations in stability analysis of panels
2014
In this paper, the stability of a simply supported axially moving elastic panel is considered. A complex variable technique and bifurcation theory are applied. As a result, variational equations and a variational principle are derived. Anal- ysis of the variational principle allows the study of qualitative properties of the bifurcation points. Asymptotic behaviour in a small neighbourhood around an arbitrary bifurcation point is analyzed and presented. It is shown analytically that the eigenvalue curves in the (ω, V0) plane cross both the ω and V0 axes perpendicularly. It is also shown that near each bifur- cation point, the dependence ω(V0) for each mode approximately follows the shape of …
Variational approach for analysis of harmonic vibration and stabiligy of moving panels
2014
In this paper, the stability of a simply supported axially moving elastic panel (plate undergoing cylindrical deformation) is considered. A complex variable technique and bifurcation theory are applied. As a result, variational equations and a variational principle are derived. Analysis of the variational principle allows the study of qualitative properties of the bifurcation points. Asymptotic behaviour in a small neighbourhood around an arbitrary bifurcation point is analyzed and presented. It is shown analytically that the eigenvalue curves in the (ω, V0) plane cross both the ω and V0 axes perpendicularly. It is also shown that near each bifurcation point, the dependence ω(V0) for each m…
Eating a variety of vegetables: the importance of feeding practices at weaning and onwards
2013
Présentation sous forme d'un diaporama (24 diapositives) classé confidentiel; International audience; Eating a varied diet is known to improve the food intake from a nutritional point of view. Weaning (i.e. introduction of complementary foods) is a transitional process between the consumption of a unique food, milk, and family foods. This is the time when the diet gets progressively diversified. Accumulating evidences point towards the role that eating a varied diet as early as the beginning of weaning plays in the development of further food acceptance and healthy eating habits. These studies will be reviewed, as well as other studies underlying more broadly the role played by parental fee…
The Effect of Predator Population Dynamics on Batesian Mimicry Complexes.
2022
Understanding Batesian mimicry is a classic problem in evolutionary biology. In Batesian mimicry, a defended species (the model) is mimicked by an undefended species (the mimic). Prior theories have emphasized the role of predator behavior and learning as well as evolution in model-mimic complexes but have not examined the role of population dynamics in potentially governing the relative abundances and even persistence of model-mimic systems. Here, we examined the effect of the population dynamics of predators and alternative prey on the prevalence of warning-signaling prey composed of models and mimics. Using optimal foraging theory and signal detection theory, we found that the inclusion …
Heterozygote advantage and pleiotropy contribute to intraspecific color trait variability
2022
The persistence of intrapopulation phenotypic variation typically requires some form of balancing selection because drift and directional selection eventually erode genetic variation. Heterozygote advantage remains a classic explanation for the maintenance of genetic variation in the face of selection. However, examples of heterozygote advantage, other than those associated with disease resistance, are rather uncommon. Across most of its distribution, males of the aposematic moth Arctia plantaginis have two hindwing phenotypes determined by a heritable one locus-two allele polymorphism (genotypes: WW/Wy = white morph, yy = yellow morph). Using genotyped moths, we show that the presence of o…