Using Eye Tracking to Understand the Impact of Cognitive Abilities on Search Tasks

Nowadays, there is an increase of studies that examine individuals' cognitive characteristics in correlation to visual perception. The present study investigated the association between cognitive abilities and Web page complexity. Specifically, differences within simple, medium and complex Web pages were observed among the field dependent, independent and mixed cognitive groups via a task completion time with the use of the eye tracking technology. The results showed that task completion time is significantly different in medium and complex pages between the FD and FI users, while, in the simple pages, no statistical differences appeared. Furthermore, it was supported that users' FD-I cognitive construct style can be identified using innovative techniques like eye tracking studies by analyzing users' scan path and heat maps

The influence of Sc on thermal stability of a nanocrystalline Al-Mg alloy processed by cryogenic ball milling

The microstructural evolution during annealing of a cryogenically ball-milled Al-7.5Mg-0.3Sc (in wt pct) was examined using differential scanning calorimetry and transmission electron microscopy (TEM). The as-milled alloy was a supersaturated fcc solid solution with an average grain size of ∼ 25 nm and heterogeneous grain morphologies and size distributions. Calorimetric measurements at a constant heating rate of 32 K/min indicated two exothermic events in association with recovery from 100 ° C to 240 ° C and recrystallization from 300 ° C to 450 ° C. Prior to recrystallization, the precipitation of Al3SC may occur at low annealing temperatures producing a nonuniform dispersion of approximately spherical particles with diameters of 4 to 5 nm. Recrystallization gave rise to heterogeneous microstructures with bimodal grain size distributions, which may result from the heterogeneity of microstructure in the as-milled state. The heterogeneous microstructures of the recrystallized Al-Mg-Sc alloy were similar to those observed in the recrystallized Sc-free Al-Mg alloy.close0