We examine the evolution of the refractive index modulation when recording gratings in an acrylamide based photopolymer. A nonlocal diffusion model is used to predict theoretically the grating evolution. The model has been developed to account for both nonlocal spatial…

In this work we study the effect of the glass substrate on the efficiencies of the different orders that propagate inside a transmission sinusoidal diffraction grating. Holographic optical elements are usually recorded on a photosensitive medium deposited on to a…

This paper analyzes the effect on the optimal value of a given linear semi-infinite programming problem of the kind of
perturbations which more frequently arise in practical applications: those which affect the objective function and the right-hand-side coefficients of the…

Desalination of seawater has become an important and growing
industry due to the water shortage in some Mediterranean countries. This
activity may result in environmental impacts, mainly generated by the
discharge into the sea of the concentrate (brine) produced. Data…

Purpose – The aim of the paper is to study the reasons for the adoption and certification of quality systems and the subsequent impacts on performance. Design/methodology/approach – The methodology selected is a study based on the perceptions of two…

This study has as its aim to help to clarify the relationship between environmental management and economic performance by
integrating it into a wider framework that includes the relationship between environmental strategy and firm performance, the latter being understood as…

Recent research into quality management has examined the relationship between quality management and performance. The purpose of this study is to identify the relationships between quality management practices, and to examine the direct and indirect effects of these practices on…

El presente estudio explora las diferencias de género en la relación entre
grupo de iguales e iniciación sexual, a través de una investigación transversal descriptiva. Se entrevistó a una muestra de 505 adolescentes de ambos sexos acerca de su
nivel…

A review of all known descriptions of immature stages of the species of the genera Scaeva Fabricius, 1805, Ischiodon Sack, 1913 and Simosyrphus Bigot, 1882 is presented using SEM illustrations. The third instar larval and/or pupal morphology of Scaeva dignota…

El objetivo de este estudio teórico fue evaluar la adecuación conceptual,
la aplicabilidad y las propiedades métricas de las medidas de depresión empleadas en
la investigación con muestras de personas mayores españolas. Para ello se realizaron
búsquedas electrónicas en las…