Here, metal nanoparticles were synthesized by chemical reduction of the corresponding metal salts in the presence of chitosan polymer. Binary and ternary metallic-chitosan Pt-Fe-CH, Pt-Co-CH and Pt-Fe-Co-CH nanocomposites were prepared. Transmission electron microscopy images and UV–Vis spectra of the nanocomposites confirmed the presence of the metal nanoparticles. The electrocatalytic activit...

this article reviews the ancient symbolic world, shia and modernity believes in iranian’s mind which are historical link between ancient symbolic world and shie. since the late nineteenth century with the modernization, for exampel civilization, constitutional movement and palavi government, gap created in iranians mind. dispite this gap, iranians mind have symbolic characteristics and are not ...

BACKGROUND Muscle co-activation plays an important role in enhancing joint stability for movement regulation during motor learning activities. In normal aging, greater muscle co-activation is induced during gait in elderly adults. This study investigated age-related changes in muscle co-activation and spatio-temporal parameters during gait and identified the relationship between muscle co-activ...

The rise of the Internet facilitates an ever increasing growth of virtual, i.e. digital spaces which co-exist with the physical environment, i.e. the physical space. In that, the question arises, how physical and digital space can interact synchronously. While sensors provide a means to continuously observe the physical space, several issues arise with respect to mapping sensor data streams to ...

Spreading activation, in the farm of computer models and cognitive theories, has recently been undergoing a resurgence of interest in the cognitive science and Al communities. Two different types of cognitive models have been proposed to explain the activation spreading results. One approach, that of marker-passing, concentrates on the spreading of symbolic information through an associative kn...

In this study, we built on previous neuroimaging studies of mathematical cognition and examined whether the same cognitive processes are engaged by two strategies used in algebraic problem solving. We focused on symbolic algebra, which uses alphanumeric equations to represent problems, and the model method, which uses pictorial representation. Eighteen adults, matched on academic proficiency an...