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Investigating permeability of porous graphene

A graphene sheet with regular pores similar to the surface form of boron
 nitride is simulated be means of crystallographic constructions. The sheet
 is represented by the aggregate of carbon atoms in the corresponding
 positions of the crystal structure which do not experience thermal
 oscillations. Within the framework of the presented approximation,
 permeability of porous graphene with respect to natural gas components is
 theoretically analysed. Based on the results obtained, selectivity of
 separation for methane-helium mixtures is determined.