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In recent years, the interest of both the tourism industry and the academic world in Muslims as consumers with specific requirements has grown remarkably. Attracting Muslim tourists is considered a good business opportunity in an increasing number of Muslim and non-Muslim countries. Tunisia is one of the most important destinations for international tourism in the Middle East and North Africa. Despite being a Muslim-majority country, no significant effort has been made as yet to reach the growing demand for tourism products in line with Islamic beliefs. This study investigates the opinions of a group of 19 key informants in Nabeul–Hammamet concerning the possibility of developing such products. This research shows that tourism operators are becoming progressively more familiar with the global opening up to products designed for Muslim consumers. Opportunities offered by this segment have been recognised, and clear signs are emerging of a proactive attitude towards Muslim-oriented tourism as a differentiation to

Land, food, energy, water and climate are linked and interconnected into a Nexus, characterized by complexity and feedbacks. An integrated management of the Nexus is critical to understand conflicts/synergies and secure efficient and sustainable use of resources, especially under climate change. The Nexus perspective is applied to Sardinia, as regional case study, to better understand and improve integrated resource management and relevant policy initiatives. Vulnerability of Sardinia Nexus is assessed under several climate projections by articulated balances of resources (water, energy) availability and sustainable development goals, at regional and subregional scales, accounting for demands and conflicts among key economic sectors (agriculture, hydro-power, tourism).

Desarrollo de un cemento de base silicatada a partir de rocas volcánicas vítreas alcalinas: interpretación de los resultados preindustriales basada en la composición químico-mineralógica de los precursores geológicos D.GIMENO (1) , J.DAVIDOVITS (2) , C.MARINI (3) , P.ROCHER (4) , S.TOCCO (4) , S.CARA (4) , N.DIAZ (1) , C.SEGURA (1) , G.SISTU (6) (1) Dept. Geoquímica, Petrologia i Prospecció Geològica, Fac. Geologia, Universitat de Barcelona, 08028 -Barcelona. Domingo@natura.geo.ub.es (2) El proyecto GEOCISTEM intentó hallar un substituto vítreo alcalino natural, económico y viable industrialmente, a los reactivos químicos empleados en un cemento silicatado patentado. Se realizó una completa prospección de los recursos consistentes en rocas volcánicas vítreas ricas en álcalis (Na 2 O+K 2 O > 10 %, K>>Na), preferentemente fragmentarias (piroclásticas) en diferentes regiones volcánicas europeas (Italia, Grecia, España). Unas 100 muestras fueron analizadas (elementos mayores mediante FRX; caracterización, petrográfica y mediante DRX) y 10 fueron empleadas en la fabricación (en laboratorio y escala semiindustrial) del cemento silicatado. Se obtuvo toda una familia de cementos (diez) con alta resistencia a la compresión (50-60 MPa a los 28 días), resistentes a la corrosión y que no desarrollan reacción alcalina-agregados, muy adecuados para el encapsulado de residuos especiales; todo ello con una notable reducción del consumo de energía en el proceso de fabricación y en el consumo de silicato de K (hasta 1/3-1/4 del requerido en la patente original). El estudio químico-mineralógico desarrollado demuestra que la formulación original del cemento era excesivamente restrictiva, y que la mineralogía producida en los procesos de desvitrificación naturales controla estrictamente el rendimiento de estos nuevos recursos durante el proceso de fabricación del cemento. Las rocas anhidras con feldespatos alcalinos y fases silíceas cristalinas predominantes obtenidas a temperaturas inferiores a las magmáticas (desvitrificación) son más interesantes que las zeolitizadas naturalmente, ya que no requieren calcinación previa con el consiguiente ahorro energético. Palabras clave: cemento silicatado, rocas volcánicas alcalinas, vidrio natural, composición química, control mineralógico Development of silicate-based cement from glassy alkaline volcanic rocks: interpretation of preliminary data related to chemical-mineralogical composition of geologic raw materialsThe GEOCISTEM project was focussed to look for an inexpensive natural glassy alkaline substitute of chemical reagents used in a trade registered cement. A complete survey for european resources made up for fragmentary (pyroclastic) alkali-rich glassy volcanic rocks (Na 2 O+K 2 O > 10 %, K>>Na) was done in several european volcanic regions (in Italy, Greece and Spain). Up to 100 samples were analysed (main constituents by XRF; petrographic and XRD characterisation) and 10 of them were used in the developing of a silicate-based cement (laboratory and semi-industrial sc...

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