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This paper presents a general method for estimation of diffusion coefficient an other relevant parameters for the analysis of vapor diffusion in polymers. Sorption curves generated by the constants estimated using the parameter estimation method presented here are in closer agreement with experimental curves than curves generated by other conventional methods., For Fickian vapor diffusion in a polymer film, the initial-slope and half-time methods were generally applied to calculate the diffusion coefficient (1). Because the majority of vapor diffusion in polymers [...]

Presents a case study related to phakomatosis pigmentovascular (PPV) type IIb with a patent umblical vein and inferior venacava hypoplasia. Classification of PPV into various types; Possible treatment for PPV.