La industria musical, la cibernética y el "streaming". Un análisis de la evolución musical desde los años 80 a la actualidad

Este trabajo analiza todo el periodo evolutivo de la Industria Musical desde principios de los años 80 hasta la actualidad con los datos dados por las propias empresas y por los informes fonográficos de cada año. Es un estudio llevado a cabo para resolver esas dudas sobre la conversión de la industria de la música en cada etapa, un total de cuatro eras que se diferencian en cuatro diferentes décadas. El objetivo de este análisis es contemplar la fuerza masiva con la que se expande Internet y, para ello, todo el sector socio-económico debe contemplar una serie de fórmulas para adherirse a ella. Por esta razón, se ha realizado un desarrollo cronológico donde nos encontramos una transformación de la música al negocio, el éxito imparable de la venta musical, la irrupción de Internet y con él un modelo digital, una crisis musical, los formatos peer-to-peer, iTunes y la actualidad que desemboca en la industria “streaming”, un negocio que aspira a ser el futuro de la música, aunque con una serie de interrogantes a la hora de su ejecución en la relación económica con los intérpretes y los derechos de autor. Se concluye con una serie de diferencias entre las principales Plataformas Cibernéticas en las que no se detectan unas desigualdades económicas sino diferencias en el propio negocio musical.Universidad de Sevilla. Grado en Periodism

Biomass explosion testing: Accounting for the post-test residue and implications on the results

This work uses the ISO 1 m3 dust explosion equipment to study the explosion properties and combustion characteristics of pulverized biomass dust clouds. An unreported feature of this apparatus is that in rich concentrations only about half the dust injected is burned in the explosion, while the overpressures remain high. This work was undertaken to try to understand the mechanisms of these phenomena, through the accounting of the debris at the end of the explosion, some of which was found in the form of impacted “cake” against the vessel wall. One possible explanation is that the residue material was biomass dust blown ahead of the flame by the explosion induced wind, impacted on the walls where then the flame side underwent flame impingement pyrolysis and the metal (wall) side material was compacted but largely chemically unchanged. The results also show that the heat transfer insulation provided by the powder wall layer contributes to the higher observed pressures. The risk of explosion with significant overpressures remains at 100% in very rich environments (equivalence ratios of up to 6) although these environments are leaner than thought due to material sequestration within the “cake”. There was little indication that a rich combustion limit was approached, this was determined in standard testing equipment that has been modified and calibrated to handle larger quantities of powder than normal

Influence of initial pressure on cork dust/air mixtures explosibility

Flammability studies of air/cork dust mixtures were conducted in a near-spherical 22.7 L explosibility test chamber, using 2500 J pyrotechnic ignitors. The suspension dust burned as air-dispersed dust clouds and the uniformity of the dispersion in the chamber was evaluated through optical dust probes. Tested particles dust had mass median diameters of 71.3 $\mu$m and 222.1 $\mu$m and the covered dust cloud concentration was up to 700-800 g/m$^3$. Measured explosion parameters included minimum explosion concentration, maximum explosion pressure and maximum rate of pressure rise. The effect of initial pressure on the explosion characteristics parameters was studied by varying the initial absolute pressure from 0.9 bar to 2.2 bar, and it was found that as initial pressure increases, there is a proportional increase of minimum explosion limit, maximum explosion pressure, and maximum rate of pressure rise

Modelling Lactation Curve in Dairy Sheep Rose under Extensive Production System Animal Husbandry Modelling Lactation Curve in Dairy Sheep Rose under Extensive Production System

Abstract The objective of this study was to compare the goodness-of-fit of four mathematical function