The present work concerns on the investigation of the role of polyethylene glycols (PEGs) as masking agent for amelioration of extraction-separation of La(III), Eu(III) and Er(III) ions by the acidic extractant bis(2-ethylhexyl)phosphoric acid (DEHPA). The studied solvent extraction system is based on the combination of chelating effect of DEHPA in the organic phase on the one hand, and the bin...

Supermolecule density functional calculations suggest the dissociative (D) mechanism for the water exchange of aquated Al(iii) species in aqueous solution and the calculated results agree well with experimental data.

This paper connects the conclusions of recent research on video games and learning to prior research on problem schemata and problem-solving. This study examines the problem-solving practices of expert and novice young players of Civilization III in a gamebased learning program, and concludes that the problem schemata framework has power and utility in analyzing problem-solving in game-based en...