Ensayos experimentales para la obtención del coeficiente hidráulico como un factor relevante en el desarrollo del proyecto de un buque

12th International Conference on Project Engineering[Resumen]En este artículo se presenta un estudio experimental del comportamiento de un modelo sujeto a la inundación progresiva de sus compartimentos. El estudio consta de varios ensayos mediante los que se inunda uno o varios compartimientos utilizando aberturas circulares, y de otras formas, con diferentes dimensiones. En cada ensayo se mide en el dominio del tiempo el calado y los ángulos de escora y cabeceo. Teniendo en cuenta estos movimientos se estima la cantidad de agua y caudal en el interior del compartimiento. Estos datos sirven para obtener el coeficiente hidráulico asociado a las aberturas del modelo. Estos coeficientes pueden ser utilizados posteriormente para calibrar programas de cálculo de la inundación progresiva en los buques. ------ [abstract] In this paper an experimental study appears about the behavior of a model subject to the progressive flood of its compartments. The study consists of several tests by means of which one or more compartments are flooded using circular openings, and of other forms, with different dimensions. In every test the domain of the time the draw and the angles of roll and pitch are measured. Bearing these movements in mind the volume and water quantity is estimated inside the compartment. This information serves to obtain the hydraulic coefficient associated with the openings of the model. These coefficients can be used later to calibrate programs of calculation to the progressive flooding in the ships

Aplicación de un modelo matemático a la cinética de intercambio derivado de hidroxifenalaminoetanol resina de poliestireno

The ion exchange kinetic among sulphonated polystyrene membranes Permion 4010 and hjdroxyphenylethanolamine derivatives has been investigate. The kinetic of ion exchange process has been studied by differential method, calculating the order about concentration in the equilibriun direct process. The logarithmic representation of initial rates against initial concentration gives as result a frrsth order for this reactions. Then the rate constants at different temperatures as well the termodynamic parameters have been calculated.Se ha estudiado la cinética de intercambio iónico entre membranas Permion 4010 de sulfonato de poliestireno y derivados de hidroxifenilaminoetanol. La cinética de la reacción de cambio se ha seguido por el método diferencial, calculando el orden con respecto a la concentración en el proceso directo del equilibrio. La representación logarítmica de las velocidades iniciales frente a las concentraciones de partida dan como resultado un orden unidad para estas reacciones. Se han calculado también las constantes de velocidad a diversas temperaturas así como las variaciones en los parámetros termodinámicos

Hydrodynamic modelling and operational oceanography for oil-spill events in the andalusian coast: a real case study during the fedra accident (October 2008)

Peer Reviewe

Introducción : cultivando los aspectos culturales al hacer investigación

El objetivo de esta introducción es enmarcar dentro de la complejidad cultural de nuestro mundo contemporáneo, las 14 contribuciones incluidas en este volumen especial. No debe descuidarse la particularidad de hacer investigación cualitativa en específicos contextos locales, nacionales o de lenguaje. Se brinda una breve descripción de cada artículo para presentar este nuevo volumen sobre las prácticas cualitativas de investigación en algunas de las periferias de nuestro globalizado mundo académicoFraming the 14 contributions included in this special issue on "Advances in Qualitative Research in Ibero America" within the cultural complexity of our current world is the objective of this introduction. The particularity of doing qualitative research in specific local, national, and even language contexts should not be overlooked. A brief description of each article is provided to introduce this new issue on qualitative research practices in some of the peripheries of our globalized academic worl

Co-Al spinel-based nanoparticles synthesized by flame spray pyrolysis for glycerol conversion

The catalytic properties of Co-Al spinel nanoparticles prepared by liquid-feed flame spray pyrolysis (L-F FSP) were investigated in the glycerol conversion in gas phase in an atmosphere of hydrogen. Reduction at 1123 K of the as-synthesized spinel nanoparticles induced the formation a new phase containing metallic cobalt species. Although, the reducibility of cobalt oxides is greatly decreased due to interaction with aluminium species, this strong interaction may prevent the aggregation of Co particles under the harsh reduction conditions. X-ray photoelectron spectroscopy (XPS) of the reduced spinel nanoparticles at 1123 K revealed that the Co/Al atomic ratio has decreased to Co/Al = 0.11, which may indicate a redistribution of the aluminum and cobalt species at the surface of the sample submitted to the reduction in a flow of hydrogen at 1123 K. X-ray diffraction (XRD) and high resolution electron microscopy (HRTEM) also reinforced the formation of metallic cobalt species after reduction of cobalt from the spinel nanoparticles at 1123 K. The main products obtained from the conversion of glycerol in the gas phase were hydroxyacetone, pyruvaldehyde, lactic acid and lactide. FSP ensured uniform dispersion of the active metal on a support material