Szukana fraza: [Abstract = "An investigation of the effects of a chemical reaction and thermal radiation on unsteady MHD free convection heat and mass transfer flow of an electrically conducting, viscous, incompressible fluid past a vertical infinite flat plate embedded in a porous medium is carried out. The flow is induced by a general time\-dependent movement of the vertical plate, and the cases of ramped temperature and isothermal plates are studied."]