1,721,586 research outputs found
Application of risk analysis to landfills in Italy: Developed and tested methodology at provincial level
No full textIn the Italian authorization procedure for the construction of a landfill, the risk analysis (RA) is mandatory in case of request for derogation from the current legislation (Ministerial Decree (D.M.) 27 September 2010) in order to demonstrate that there is no risk for the environment. This paper describes the experience of the Province of Brescia, public body appointed for giving authorizations for new landfills, and its collaboration with the University of Brescia for the specific topic of RA applied to landfills. The research was undertaken because a lack of complete and specific indications about the application of such methodology to landfills has been identified. In particular, the province of Brescia faced the issue of verifying the proper application of such methodology in relevant cases. After referring to the legal and technical framework, including the current national legislation and a summary of the technical documents available for the topic (guidelines and instructions by technical bodies), the paper outlines the technical-preliminary approach applied by the Province of Brescia. This is complemented by a description of the methodological approach followed for RA for groundwater and for gaseous emissions, with a focus on biogas, together with the presentation of the results for three relevant case studies. The critical aspects that were faced and the proposal to overcome them, which are under discussion with the responsible bodies, are described as well
Reliability design of a pressure vessel made of composite materials
No full textThe focus of this research is to evaluate the reliability of pressure vessels made of composite materials (carbon and glass fiber) with respect to stress and burst pressure. Small thicknesses theory was adopted to sizing the components. The geometry was verified through FEM analyses. To compare the results, also pressure vessel, made of steel and aluminum alloy, were studied. The reliability of the components and the deterministic safety coefficients were evaluated considering the variability of geometric characteristics, the materials properties and the number of layers wrapped. From the results, it emerges that the weight of pressure vessel made of carbon fibers is equal to 17% to the one made of steel, that the relationship between deterministic coefficient and reliability is highly non-linear and the reliability of the components made of composite materials, are similar to those made of steel or aluminum alloy
Risanamento di acque sotterranee contaminate da cromo esavalente. II Parte: casi applicativi
No full textFeasibility study of a jib crane made of composite materials considering deterministic and probabilistic approach
No full textThis numerical research reports results related to the implementation of innovative materials such as composite materials to a lifting apparatus and in particular a classic jib crane with a capacity of 500 kg. The work involves an initial analytical dimensioning followed by verifications conducted by finite element analysis. The parameters adopted are maximum displacement, safety coefficient with respect to maximum stress and with respect to buckling phenomena for both the boom and column. The materials assumed are classical steel, aluminum and composite materials with carbon and glass fibers. The performance in terms of stiffness and safety of the crane designed with the new materials should be very similar to that of the crane designed in steel. The last part of the research concerns the design of the crane by adopting probabilistic methods. It is clear from the results that the crane made of composite material and especially with carbon fibers has the lowest weight i.e., about 20% of the weight of the corresponding steel crane. In terms of reliability, assuming defined values in the dispersions, the different solutions are comparable
A performance monitoring algorithm for sustained optimal operation with economic MPC
Full text linkThis paper addresses the problem of performance monitoring for Economic Model Predictive Control (EMPC) in the presence of plant parameter changes. In order to cope with plant-model mismatch, we adopt a recently developed offset-free EMPC algorithm which requires the gradient of the plant input-output steady-state map. A subspace identification method is used in order to estimate this plant gradient from transient measurements. However, when the plant parameters change, this method may fail unless re-identification is performed. Hence, to start a new data collection for the identification an event-triggered mechanism is proposed, based on a suitable performance monitoring strategy. In this case this mechanism investigates a possible, more profitable, steady-state equilibrium and, if convenient, it re-identifies the plant gradient. The proposed monitoring technique is then successfully tested over an illustrative example of a chemical reactor
Resolving the FIR/SMM Cosmic Background and thus Studying the High-Redshift Universe from Concordia Station
No full textNon-conventional stabilisation/solidification treatment of industrial wastes with residual powdered paints
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