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Artículo
An Easy Method for the Determination of Ra Isotopes and Actinide Alpha Emitters from the Same Water Sample
(Elsevier, 1986)
Radium isotopes and actinide α emitters are easily determined from the same water sample. The Ra fraction is obtained by coprecipitation with Ba, while a Fe coprecipitation is used for the actinides. Both fractions are ...
Artículo
Diffusion equations for nonhomogeneous media. Existence of similarity solutions
(Elsevier, 1985)
We study the invariance of the diffusion equation δP(x,t)/δt = (δ/δx)[D(x)δP(x,t)/δx] under continuous groups of transformations. We show the conditions which D(x) must satisfy for the existence of similarity solutions.