An experimental investigation of the energy conversion in electrokinetic phenomena is described. Electroosmosis and streaming potential have been the electrokinetic techniques employed and ion-exchange plugs were used as porous media. The effect of the structural characteristics (composition, compactness and D. V. B. grade) of the ionic plug, when the permeant composition is kept constant, and also the influence of the electrolyte concentration and the composition of the acetone-water mixture on the maximum energy conversion efficiency (^m ax ) have been studied. The experimental results have been analyzed on the basis of Thermodynamics of Irreversible Processes. The variation trends of j/ max against the structural characteristics of the plug have been explained as being due to the behavior of the parameters of the systems themselves (zeta-potential and pore radius). When the permeant composition is varied the behavior of ^m ax is a consequence of the changes in the solid-liquid interface and the plug structure, besides the changes of the liquid phase characteristics.
La dictadura de Primo de Rivera durante el período final del reinado de Alfonso XIII aceleró los reajustes internos que la élite económica granadina venía experimentando desde finales del siglo XIX. Los principales contribuyentes de la ciudad pasaron de ser agrarios a comerciantes, industriales y profesionales médicos. La política fiscal aplicada por José Calvo Sotelo desde el Ministerio de Hacienda favoreció esos cambios. La burguesía industrial y comercial, clase emergente desde finales del siglo XIX, vió reforzado su papel hegemónico dentro del bloque de poder. Las dinámicas económicas, sin embargo, se vieron frenadas por la organización tribal de la élite económica.
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