Szukana fraza: [Abstract = "The numerical investigation of the effects of radiation and chemical reaction on an unsteady MHD free convection flow with a parabolic starting motion of an infinite isothermal vertical porous plate taking into account the viscous dissipation effect has been carried out. The fluid is considered a gray, absorbing emitting radiation but a non\-scattering medium. The dimensionless governing equations for this investigation are solved numerically by applying the Ritz finite element method."]