Dispositivo para el control rápido de la energía de haces de electrones acelerados

Referencia OEPM: P9101229 .-- Fecha de solicitud: 21/05/1991.-- Titulares: Universidad de Valencia , Consejo Superior de Investigaciones Científicas (CSIC).Dispositivo para el control rápido de la energía de haces de electrones acelerados de forma visual construido con material plástico centelleador que consiste en el apilamiento de un conjunto de láminas, envueltas individualmente con material reflectante y aisladas ópticamente entre sí. Según el espesor atravesado del material se determina la energía del haz incidente. Es de aplicación para la medición de la energía de las partículas cargadas en los aceleradores empleados con fines terapéuticos.Peer reviewe

Emission-Driven Hybrid Rocket Engine Optimization for Small Launchers

Hybrid rocket engines are a green alternative to solid rocket motors and may represent a low-cost alternative to kerosene fueled rockets, while granting performance and control features similar to that of typical storable liquid rocket engines. In this work, the design of a three-stage hybrid launcher is optimized by means of a coupled procedure: an evolutionary algorithm optimizes the engine design, whereas an indirect optimization method optimizes the corresponding ascent trajectory. The trajectory integration also provides the vertical emission profiles required for the evaluation of the environmental impact of the launch. The propellants are a paraffin-based wax and liquid oxygen. The vehicle is launched from the ground and uses an electric turbo pump feed system. The initial mass is given (5000 kg) and the insertion of the payload into a 600-km circular, and polar orbit is considered as a reference mission. Clusters of similar hybrid rocket engines, with only few differences, are employed in all stages to reduce the development and operational costs of the launcher. Optimization is carried out with the aim of maximizing the payload mass and then minimizing the overall environmental impact of the launch. The results show that satisfactory performance is achievable also considering rocket polluting emissions: the carbon footprint of the launch can be reduced by one fourth at the cost of a 5-kg payload mass reduction

C'è musica e musica: intorno a Luciano Berio e la musica contemporanea

Volume di arricchimento dedicato a Luciano Berio e alla musica contemporanea, un esempio di ricerca musicale, elemento di spicco nel panorama della musica d'avanguardia. La varietà sorprendente dei mondi sonori inventati da Berio definisce abbondantemente il fascino della sua musica. Immaginazione illuminata, padronanza virtuosistica, spontaneità emozionale e condensazione intellettuale, la musica di Berio attraversa materiali e tecniche con la sovrana potenza d'urto della sensibilità

Aortic arch rupture after multiple multilayer stent treatment of a thoracoabdominal aneurysm

Despite the improvement in diagnostic and therapeutic strategies, the treatment of thoracoabdominal aneurysms is still burdened with a high incidence of peri/postoperative morbidity and mortality. The multilayer flow modulator is a new and promising technique for the treatment of such disease; however, some limits are still evident. We report the case of a 76-year-old woman affected by a symptomatic thoracoabdominal aneurysm treated with multiple Cardiatis multilayer flow modulators complicated by aortic arch rupture on the fifth postoperative day, with subsequent patient death