in this paper, an effective numerical method is introduced for the treatment of nonlinear two-dimensional volterra-fredholm integro-differential equations. here, we use the so-called two-dimensional block-pulse functions.first, the two-dimensional block-pulse operational matrix of integration and differentiation has been presented. then, by using this matrices, the nonlinear two-dimensional vol...

The excellent properties of graphene phase change nanocomposite made it have potential application value in the field heat storage materials, which was expected to achieve integration transfer and storage. In order enhance thermal performance paraffin energy storage, structure models n-octadecane three kinds graphene/n-octadecane composites were established. Molecular dynamics method used study...