1,720,970 research outputs found
A LCA study to investigate resource-efficient strategies for managing post-consumer gypsum waste in Lombardy region (Italy)
No full textThis study aimed at evaluating environmental sustainable solutions for managing the gypsum waste in Lombardy region (Italy), based on the Life Cycle Assessment (LCA) methodology. Primary data and information related to gypsum waste flows, recovery technologies and end-market of recycled materials were gathered to depict the whole recycling chain and to build up a life cycle inventory dataset specific for the geographical context under study. The LCA analysis of the current scenario allowed to identify strength and weak points of the regional system: up to date, most impacts are related to the recovery of gypsum waste by mixing with other mineral construction and demolition waste, which appeared as the prevalent option. Different alternative scenarios were hence analyzed by considering that all the gypsum waste is recycled in dedicated plants and by analyzing different end-uses of the recycled material. The focus was placed on four major sectors for which the use of recycled gypsum is technically feasible: plasterboard manufacturing, cement industry, disinfection of sewage sludge, and agriculture. For each analyzed end-use scenario, the potential market demand in Lombardy region as well as the technical requirements of the recycled gypsum were evaluated as key points in the LCA. Results from the impact assessment were used to provide recommendations for the regional government to move towards a more resource-efficient waste management
Rifiuti a base di gesso: valutazione LCA del sistema di gestione della regione Lombardia
No full text
Catalogo degli Elementi Architettonici. Schede nn. 1, 5, 32, 38-43, 45-46, 66
No full textCatalogo delle membrature architettoniche e di arredo pertinenti al complesso paleocristiano di San Gabriele a Kos (Dodecaneso), in seno alla relativa pubblicazione monografica
Very High Accuracy Attitude Determination for LOS Steering
No full textIn this paper the problem of line-of-sight sensing using a high-bandwidth Angular Rate Sensor (ARS), together with attitude sensors like a star tracker and a gyroscope is considered. Parametric models for the dynamics of the ARS have been identified, taking also into account model uncertainty due to temperature dependence and frequency-domain fitting errors. Based on such models, a fully integrated solution to the three-axis attitude and rate determination problem has been developed, both for on-line and off-line filtering. The performance of the developed algorithms has been assessed in a simulation study, based on test cases representative of a desired filter bandwidth up to 1 kHz
FAST-Hex - A Morphing Hexarotor: Design, Mechanical Implementation, Control and Experimental Validation
Full text linkWe present FAST-Hex, a micro aerial hexarotor platform that allows to seamlessly transit from an under-actuated to a fully-actuated configuration with only one additional control input, a motor that synchronously tilts all propellers. The FAST-Hex adapts its configuration between the more efficient but under-actuated, collinear multi-rotors, and the less efficient but full-pose-tracking, which is attained by non-collinear multi-rotors. On the basis of prior work on minimal input configurable micro aerial vehicle, we mainly stress three aspects: mechanical design, motion control, and experimental validation. Specifically, we present the lightweight mechanical structure of the FAST-Hex that allows to only use one additional input to achieve configurability and full actuation in a vast state space. The motion controller receives as input any reference pose in in R3 SO(3) (3D position + 3D orientation). Full pose tracking is achieved if the reference pose is feasible with respect to actuator constraints. In case of unfeasibility, a new feasible desired trajectory is generated online giving priority to the position tracking over the orientation tracking. Finally, we present a large set of experimental results shading light on all aspects of the control of the FAST-Hex
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