Abstract: Theoretical investigation of frequency transformation for the case of pure ZnO films, ZnO: Ag (1.6 at.%) and ZnO: Cu (4.7 at.%) enables increasing conversion efficiency while taking phase effects into consideration. We will use the constantintensity approximation of fundamental radiation. This analytical method also allows to approximately measure the maximum of secondharmonic intensity for the case of ZnO films with silver and copper impurities. We will analyze the parameters that restrict the efficiency of frequency conversion. We can calculate the coherent length of crystal converter at given pump intensity. These methods of investigation for secondharmonic generation in pure and doped ZnO films can be useful in the research area of other film.
Keywords: nanocomposite film; dopant; secondharmonic generation method; constantintensity approximation. PACS Number(s): 42.65.k, 42.70.a, 42.70.Mp, 61.46. – w
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Abstract: The objective of this paper is to study the effects of heat and mass transfer on unsteady hydromagnetic free convective flow of a viscous incompressible electrically conducting fluid past an infinite vertical porous plate in presence of constant suction. The fundamental governing equations of the flow field are solved using finite element method and the numerical solutions are obtained for velocity, temperature, concentration distributions. The effects of different physical flow parameters on these respective flow fields are discussed through graphs and results are physically interpreted. The problem has some relevance in the geophysical and astrophysical studies.
Keywords: Heat and Mass transfer, Porous Medium, MHD, Finite Element Method.
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