in this thesis,spin dependend transport and electron transport through of ng/sg(graphene/ superconductor graphen) are studied in the junction of ng/fgt/sg. due to andreev reflection conductance increases in the presence of superconductor graphene.also, by applying a voltage gate on a superconductor, fermi level shifts and the conductance is independent of ferromagnatic substrate. also, the cond...

the elegy of cities is one kind of elegy in which a poet describes the stricken cities, pains and agonies of people of the cities undergone destruction and devastation. this research is a historical - comparative study of this genre in persian and arabic literature. it shows that these elegies in both arabic and persian literature have the same political and internal reasons, such as the assaul...

today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. f...