3,602 research outputs found
A new semi-nonverbal task glance, moderate role of cognitive flexibility in ADHD children’s theory of mind
No full textSeveral studies have documented executive functions' impairment in children with ADHD and the link between Theory of Mind, executive functions and ADHD with different results. The findings in the literature are somewhat mixed, possibly because of a variety of tasks used. The aim of this study is to investigate the relationship between ToM and Executive Functions with nonlanguage based tasks. 30 ADHD children (7-9 years old) and 30 controls (age and IQ matched). All participants ToM were assessed using the Animated Triangles Paradigm task and two EF task (IED and SOC) from the neuropsychological battery of the Cambridge Neuropsychological Test Automated Battery. Children with ADHD had a significant ToM and EF impairment relative to the control group. ToM was not significantly correlated with ET however, the performance on IED tasks affected the performance on ToM tasks. The study provides evidence for a link between intentionality subcomponent of ToM and inhibitory control of EF in ADHD children, which supports the hypothesis that inhibition may play a central role to explain the association between ToM and EF
Energy harvesting from train vibrations
No full textIn this paper, linear mechanical oscillators are designed to harvest energy from train-induced vibrations. The harvested energy could be used, for example, to charge sensors mounted on the rail track for structural health monitoring. The dominant frequencies due to a passing train are determined for a specific train and speed from a recorded acceleration time-history. Using a simple model of an oscillator, the total energy harvested for the passage of one train is calculated. The stiffness, and hence the tuning frequency of the device, is varied in simulations to determine the optimum frequency at which to tune the device for a constant value of mass and damping in the device. Further simulations are conducted to investigate the power that could be harvested from multiple oscillators tuned at several dominant frequencies, and their performances are analysed and compared. The constraint for maximum relative displacement is considered in the design of each harvester, and this is adopted to assure that the amplitude of the oscillation is finite and does not exceed the physical size of the device. The robustness of the harvester is also analysed for different train speeds
Energizing Blockchain: Legal Gaps and Power Plays in the Energy Sector’s Digital Transformation
No full textInvestigating speech tempo, speaking rate, and the related factors in the iranian elderly women talking with tehrani and semnani accents
No full textBackground: Some variables, such as age, gender, regional and dialectical differences influence speech tempo. Men and younger individuals speak faster than women and the elderly. Therefore, these variations should be considered when assessing speaking rate. Objectives: Since different accents influence speaking rates and there is no previous study investigated speech tempo with respect to regional and accent differences in Iran, and given that the elderly are more prone to problems influencing speaking rate, the present study was done to compare speech tempo and speaking rate in two different accents, namely Tehrani and Semnani, and to investigate some related factors. Methods: This cross-sectional study was performed on 200 elderly women selected via convenience sampling method. Speech tempo, speaking rate, verbal fluency, and cognition scores were compared using an independent-samples t-test. Pearson�s correlation coefficient test was used to assess correlations between speaking rate and level of education, Montreal cognitive assessment (MoCA), and verbal fluency scores. Results: No significant difference was found in speech tempo between the studied accents (P = 0.13). Speaking rate was significantly slower in the Tehrani accent than the Semnani one (P = 0.04). The Tehrani elderly obtained significantly less scores in verbal fluency and MoCA ((P � 0.001) and (P = 0.04), respectively. In both groups, speaking rate had a significant correlation with verbal fluency and MoCA scores but not with level of education. Conclusions: Although, our results showed no difference in speech tempo between the studied accents, the Tehrani elderly unexpectedly spoke more slowly meaning that they paused more while speaking. There was a relationship between faster speaking, better verbal fluency, and cognitive performance. © 2021, Author(s)
The biotic affinity of N Iran during Carboniferous-Early Permian times: was N Iran in the peri-Gondwanan fringe?
No full textThe Effects of Hybridization on the Impact Properties of Basalt/Nylon Intraply Woven Fabric Composites
No full textLow-velocity impact tests were performed to investigate the impact behaviour of hybrid composite laminates
reinforced by basalt-nylon intraply fabrics. The purpose of using this hybrid composite is to combine the good
mechanical property of basalt fiber as brittle fiber with the excellent impact resistance of nylon fiber as ductile
fiber. Five different types of woven fabric with different content of nylon (0%, 25%, 33.3%, 50% and 100%)
were used as reinforcement. For hybrid fabrics the percentage of nylon is equal in the warp and weft direction.
The quasi-isotropic stacking sequence was selected for this study. The height of 2.4 m was chosen,
corresponding to nominal impact energy of 30 J. The c-scan techniques were employed to assess the internal
damage of composite laminates. The results show that impact performance of these composites was affected
sufficiently of the basalt/nylon fibers content. The visual inspection and ultrasonic c-scan of the impact
damaged specimens revealed that content of basalt/nylon fiber could restraint the type and size of damages
Compressive Residual Strength of Intraply Basalt/Nylon Hybrid Composite Laminates Subjected to Low-Velocity Impacts
No full textIn this study, it is attempted to improve the brittle behavior of basalt fibers in a woven fabric by mixing it
with different content of nylon fibers. The purpose of using this hybrid composite is to combine the good mechanical
property of basalt fiber with the excellent impact resistance of nylon fiber. Five different types of woven fabric were
used as reinforcement, namely, a homogeneous basalt fabric, a homogeneous nylon fabric and three hybrid basalt/nylon
fabrics by different content of nylon (25%, 33.3%, and 50%). For hybrid fabrics the percentage of nylon is equal in the
warp and weft direction. The quasi-isotropic stacking sequences ([(+45,-45)/(0,90)]s) was selected for this study. The
height of 3.3 m was chosen, corresponding to nominal impact energy of 40 J. To evaluate the residual strength,
compressive after impact has been examined and compared. In addition, ultrasonic C-scan was used to determine extent
and type of damage for impacted specimens. The results show that the basalt/nylon fiber content have significant effects
on the residual strength of intraply hybrid composites that reinforced with these fibers. By increasing of basalt/nylon
fibers content the critical and failure compression strength increased. The visual inspection and ultrasonic c-scan of the
impact damaged specimens revealed that the nylon/basalt fiber content has a sufficient effect on the type and size of
damage. Also, with increasing the nylon/basalt content, the most important failure mode was changed from fiber
breakage to local buckling
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