Esplendor a la Turtusa Islàmica : Comerç i navegació a la taifa de Turtusa del segle XII

Esplendor econòmica i cultural de Tortosa en el segle XII, comerç amb els cristians, navegació marítima i sobretot fluvial per l'Ebre i, finalment, paper de la comunitat jueva de la ciutat en totes aquestes facetes.

Economic structure and key sectors analysis of greenhouse gas emissions in Uruguay

This paper identifies the key sectors in greenhouse gas emissions of the Uruguayan economy through input-output analysis. This allows to precisely determine the role played by the different productive sectors and their relationship with other sectors in the relation between the Uruguayan productive structure and atmospheric pollution. In order to guide policy design for GHG reduction, we decompose sectors liability between the pollution generated through their own production processes and the pollution indirectly generated in the production processes of other sectors. The results show that all the key polluting sectors for the different contaminants considered are relevant because of their own emissions, except for the sector Motor vehicles and oil retail trade, which is relevant in CO2 emissions because of its pure, both backward and forward, linkages. Finally, the best policy channels for controlling and reducing GHGs emissions are identified, and compared with the National Climate Change Response Plan (NCCRP) lines of action.

Locating emergency services with priority rules: The priority queuing covering location problem

One of the assumptions of the Capacitated Facility Location Problem (CFLP) is thatdemand is known and fixed. Most often, this is not the case when managers take somestrategic decisions such as locating facilities and assigning demand points to thosefacilities. In this paper we consider demand as stochastic and we model each of thefacilities as an independent queue. Stochastic models of manufacturing systems anddeterministic location models are put together in order to obtain a formula for thebacklogging probability at a potential facility location.Several solution techniques have been proposed to solve the CFLP. One of the mostrecently proposed heuristics, a Reactive Greedy Adaptive Search Procedure, isimplemented in order to solve the model formulated. We present some computationalexperiments in order to evaluate the heuristics performance and to illustrate the use ofthis new formulation for the CFLP. The paper finishes with a simple simulationexercise.

Símbolos del poder en el hipódromo de Constantinopla

El hipódromo de Constantinopla se convirtió, desde su reconstrucción monumental por Constantino I hasta su saqueo por los cruzados en 1204, en el principal escenario de manifestación de la majestad imperial. Centro de propaganda política por excelencia, este edificio tomó como modelo el Circo Máximo de Roma, con quien guardaba más parecido que con sus homónimos griegos. Todo en él estaba proyectado para realzar la idea de la soberanía del basileo: su disposición arquitectónica, unido al complejo palacial por medio de la kathisma -el palco imperial y el palacio del hipódromo con el mismo nombre-; la decoración, compuesta por obeliscos, columnas y otros elementos llenos de simbolismo solar, así como por una gran cantidad de esculturas destruidas en el saqueo de 1204; y la misma liturgia del hipódromo, un complejo ceremonial destinado a ensalzar al emperador como vencedor perpetuo.