Search results for "Young"
showing 10 items of 5812 documents
Tiešsaistes uzdevumi angļu valodas vārdu krājuma apguvei sākumskolā
2015
Diplomdarba mērķis ir izpētīt kā tiešsaistes uzdevumi ietekmē angļu valodas vārdu krājuma apguvi sākumskolā. Diplomdarba autore uzskata, ka vārdu krājuma apguve ir viens no nozīmīgākajiem valodas aspektiem, kam ir liela nozīme sākumskolas skolēnu mācīšanā. Diplomdarba mērķa sasniegšanai darba autore izvēlējas atsevišķa gadījuma pētījuma metodi. Metodes, kas tika izmantotas datu vākšanā, ir anketēšana, priekšpārbaude un pēcpārbaude. Lai pārbaudītu kā tiešsaistes uzdevumi ietekmē skolēnu vārdu krājuma bagātināšanos, kopumā tika novadītas četras mācību stundas. Pētījuma rezultātā ir konstatēts, ka vairākums skolēnu ar tiešsaistes uzdevumiem uzlaboja savu vārdu krājumu. Darba autore secināja, k…
Accurately evaluating Young’s modulus of polymers through nanoindentations: a phenomenological correction factor to the Oliver and Pharr procedure
2006
The Oliver and Pharr [J. Mater. Res. 7, 1564 (1992)] procedure is a widely used tool to analyze nanoindentation force curves obtained on metals or ceramics. Its application to polymers is, however, difficult, as Young’s moduli are commonly overestimated mainly because of viscoelastic effects and pileup. However, polymers spanning a large range of morphologies have been used in this work to introduce a phenomenological correction factor. It depends on indenter geometry: sets of calibration indentations have to be performed on some polymers with known elastic moduli to characterize each indenter.
On the Use of the Nanoindentation Unloading Curve to Measure the Young's Modulus of Polymers on a Nanometer Scale
2005
Summary: The nanoindentation test is a fundamental tool to assess the link between morphology and mechanical properties. The preliminary results of a more exhaustive study about the applicability to polymers of the most used procedure to determine elastic modulus by indentation are reported in this short communication. A departure of the experimental conditions from the theoretical assumptions and results that give rise to the Oliver and Pharr analysis is shown to occur under a wide range of experimental conditions, with applied loads and penetration depths covering several orders of magnitude and using different indenter geometries. Unloading curves with exponents significantly larger than…
Numerical–Analytical Model for Nanotube‐Reinforced Nanocomposites
2013
Molecular modifications—Mechanical behaviour relationships for gamma irradiated LLDPE/PA6 blends
1994
Abstract The molecular modifications, due to γ radiation under vacuum, of linear low density polyethylene/polyamide 6 blends are presented and related to their mechanical behaviour. Solubility and melt viscosity tests indicate that in blends the polyethylene component undergoes mainly crosslinking phenomena, whereas the main effect on polyamide is chain branching. According to these molecular modifications, the most relevant effect is the increase of the tensile modulus for the polyethylene rich blends and the increase of the impact strength for the polyamide rich blends.
Jaunākā pirmsskolas vecuma bērnu vārdu krājuma bagātināšana didaktiskajās rotaļās
2018
Bakalaura darba tēma – “Jaunākā pirmsskolas vecuma bērnu vārdu krājuma bagātināšana didaktiskajās rotaļās”. Bakalaura darba autore: Indra Tišanova. Izvēlētās tēmas aktualitāte pamatojama ar to, ka didaktiskās rotaļas pirmsskolas vecuma bērniem rada patīkamas izjūtas, veicina sadarbības un citas nepieciešamās prasmes, tādēļ svarīgi izpētīt, kā ar rotaļu palīdzību var bagātināt bērnu vārdu krājumu. Pētījuma mērķis – teorētiski un praktiski izzināt vārdu krājuma bagātināšanas iespējas didaktiskajās rotaļās jaunākā pirmsskolas vecuma bērniem. Pētījums sastāv no divām daļām – teorētiskā un empīriskā pētījuma. Teorētiskajā daļā pētīti un izzināti latviešu un ārvalstu pedagoģijas un psiholoģijas p…
Association between osteocalcin and cognitive performance in healthy older adults.
2016
INTRODUCTION: cognitive deterioration and reductions of bone health coincide with increasing age. We examine the relationship between bone composition and plasma markers of bone remodelling with measures of cognitive performance in healthy adults.METHODS: this cross-sectional study included 225 old (52% women, mean age: 74.4 ± 3.3 years) and 134 young (52% women, mean age: 23.4 ± 2.7 years) adult participants from the MyoAge project. Whole body bone mineral density was measured by dual-energy X-ray absorptiometry. Blood analyses included a panel of bone-related peptides (dickkopf-1, osteoprotegerin, osteocalcin (OC), osteopontin, sclerostin, parathyroid hormone and fibroblast growth factor …
Polygenic association between attention-deficit/hyperactivity disorder liability and cognitive impairments.
2022
AbstractBackgroundA recent genome-wide association study (GWAS) identified 12 independent loci significantly associated with attention-deficit/hyperactivity disorder (ADHD). Polygenic risk scores (PRS), derived from the GWAS, can be used to assess genetic overlap between ADHD and other traits. Using ADHD samples from several international sites, we derived PRS for ADHD from the recent GWAS to test whether genetic variants that contribute to ADHD also influence two cognitive functions that show strong association with ADHD: attention regulation and response inhibition, captured by reaction time variability (RTV) and commission errors (CE).MethodsThe discovery GWAS included 19 099 ADHD cases …
Power of Cognition: How Dysfunctional Cognitions and Schemas Influence Eating Behavior in Daily Life Among Individuals With Eating Disorders
2018
Eating disorders (EDs) are characterized by marked cognitive distortions and maladaptive schemas. Cognitive models of EDs highlight the direct impact of cognitive dysfunctions on eating-related disturbances, insofar as specific cognitive contents such as thoughts about diet rules and food or loss of control may trigger disturbed eating behavior. Moreover, early maladaptive schemas that reflect perfectionist standards and relate to achievement and performance seem to be associated with disturbed eating, e.g., via their impact on situation-specific appraisals. However, so far, no study has investigated these assumptions. Hence, the present study sought to demonstrate whether and how cognitive…
A single bout of physical exercise does not affect young adults’ executive functions
2020
Summary Study aim. The purpose of the current study is to determine the impact of single bouts of physical exercise of different duration and intensity on young adults’ executive functions. Material and methods. The study employed 81 participants (37 females, 44 males) ranging between 19 and 39 years (mean age: 24.6 ± 4.08 years; mean height: 168 ± 9.67 cm; mean weight: 67.2 ± 13.0 kg). The executive functions were assessed through the Stroop task, the Tower of London test, and the Corsi block test. Participants were randomly assigned to one of the three experimental conditions (30-second Wingate test condition, an incremental intensity exercise test, and a submaximal constant-intensity tes…