Background and Objectives: Phenol is a toxic and persistent substance in the environment. The aim of this study was to evaluate the performance of silica aerogel synthesized using sodium silicate in the adsorption of phenol from aqueous solutions. Material and Method: Silica aerogel was prepared by Sol-Gel process. The influence of effective variables such contact time, initial pH of the sol...

the ability to speak two languages in the world is a remarkable achievement. there is a good reason to believe that bilingualism is the norm for the majority of people in the world because 70% of the earth’s population are supposed to be bilingual or multilingual. various investigations have shown that the native language impacts foreign word recognition, and this influence is adapted by the de...

Graphene has exhibited wide applications in nanotechnology, especially in biomedicine because of its unique physical and chemical properties. The degree of toxicity of graphene materials depends on various factors such as surface charge, physicochemical properties, toxicity determination methods, and cell line. Direct contact of the very sharp edges of graphene with the cell membrane is one of ...

la sociolinguistique est la partie de la linguistique ayant pour objet l’étude du langage sous son aspectsocioculturel. william labov est considéré dans la tradition anglo-saxonne, comme le fondateur de la sociolinguistique modern. c’est lui qui, en 1966, publie “the social stratification of english in new york city” ( la stratification social de l’anglais à new york). la recherche sociolingu...

abstract while task-based instruction is considered as the most effective way to learn a language in the related literature, it is oversimplified on various grounds. different variables may affect how students are engaged with not only the language but also with the task itself. the present study was conducted to investigate language and task related engagement on the basis of the task typolog...