1,721,039 research outputs found
Portable detection system for Ochratoxin A by real time chromatography and a-Si:H photodiodes
No full textIn this paper, we report on the design, fabrication and characterization of a low cost, portable detection system able to quantify, in a rapid and reliable way, the contamination level of Ochratoxin A (OTA) in red wine. The operating principle is the real-Time monitoring of the natural fluorescence of OTA molecules during a chromatographic run on a thin layer chromatographic plate. The fluorescence is detected by an array of amorphous silicon photosensors whose photocurrents are directly proportional to the amount of OTA molecules present in the sample under analysis. By comparison with a reference sample the system is able to determine if the OTA contamination level is below or above the limit law for each food commodity. The system performances have been verified in real matrices analyzing several samples extracted from red wines obtaining a minimum detectable quantity of 0.2ng. © 2017 IEEE
SILER Project "Seismic-Initiated events risk mitigation in LEad-cooler Reactors" Horizontal fail-safe system design for the safeguard of the ELSY isolation system during a beyond design earthquake
No full textThis document concerns the study of a horizontal fail-safe system for the safeguard of the isolation system of ELSY (European Lead-cooled System) during a beyond design earthquake. The analyses are focused on the evaluation of the forces associated with the impacts of the reactor building against the retaining surrounding wall that can be used as fail-safe system. In order to reduce the intensity of the impacts, different values of the gap between the wall and the reactor building are tested and some options of placing a bumper system on the active side of the wall are evaluated. Linear and non-linear model of the isolation system are implemented into the ABAQUS code, applying respectively implicit and explicit analyses. The linear and non-linear behaviour of the isolators is modeled by using the spring-dashpot elements in the first case and the Cartesian connectors in the second. The results of the numerical analysis, aimed to check the dynamic behaviour of the isolation system during a beyond design earthquake, with and without the presence of the horizontal fail-safe system, are shown
Risultati della sperimentazione del sistema “Share Art” presso il museo del CSAC a Parma
No full textIl sistema ShareArt è un dispositivo che permette, attraverso una telecamera ad infrarossi, di rilevare automaticamente i volti che guardano in direzione della telecamera acquisendo contestualmente una serie di informazioni relative all’osservazione delle opere d’arte, come ad esempio il tempo di permanenza, la distanza, il percorso compiuto. L’applicazione di questo sistema al mondo dell’arte, installando la telecamera in modo che rilevi i volti che osservano un’opera esposta in un percorso museale, in una mostra temporanea, in una galleria, in un sito archeologico, dà l'opportunità di monitorare il gradimento e la fruizione da parte dell’osservatore delle opere stesse.
In questo rapporto tecnico sono descritti i risultati ottenuti dalla sperimentazione del sistema ShareArt, condotta in una prima fase in laboratorio, con una serie di prove nelle diverse condizioni, e successivamente sul campo con l’installazione del dispositivo presso il museo del Centro Studi e Archivio della Comunicazione (CSAC) di Parma nel periodo 18-20 Novembre 2016
L’infrastruttura ICT della nave rompighiaccio “Laura Bassi”, Progettazione e realizzazione
Full text linkQuesto rapporto tecnico descrive l’infrastruttura ICT della rompighiaccio "Laura Bassi" al termine delle due campagne oceanografiche del PNRA effettuate tra il 2019 e il 2021 nel Mare di Ross. Oltre alla descrizione dell’architettura della rete e all’indicazione dei dispositivi installati, sono evidenziati i criteri seguiti per la progettazione e la realizzazione dell’infrastruttura
Modelling of a gel material for anti-seismic uses
No full textThis report describes the results obtained in the framework of the service contract between ENEA and SNF, aimed at developing suitable gels to be used in anti-seismic applications. In particular, the document summarizes the numerical simulations performed to implement a Finite Element Model (FEM) of the material based on the experimental characterization of several specimens of three different gel compounds
Modellazione 3D di zone terremotate tramite immagini acquisite da aeromobili a pilotaggio remoto (droni)
No full textIn questo documento riportiamo il lavoro svolto a seguito del terremoto che ha colpito il centro Italia il 24 agosto 2016. Il lavoro è consistito nello sviluppo di un modello tridimensionale (3D) delle zone terremotate. In particolare, è stato acquisito un video disponibile in internet ed è stato elaborato tramite software commerciali, reperibili dai siti dei produttori, al fine di ottenere il modello desiderato. In dettaglio, sono stati modellati sia un singolo edificio, caratterizzato dal parziale crollo del tetto e di una facciata, sia un intero aggregato colpito da crolli totali degli edifici. Il lavoro ha mostrato la reale fattibilità e l’immediato beneficio che si ottiene dalla modellazione 3D di zone terremotate sebbene nel presente studio sia stato usato un video non acquisito per questo scopo. Come sviluppo futuro si propone l’uso dei droni in volo su zone terremotate con piani di volo impostati per la creazione di modelli 3D. Inoltre, proponiamo l’uso di fotocamere multispettrali o iperspettrali perché aumentano il numero delle informazioni utilizzabili per pianificare le operazioni durante la gestione dell’emergenza
The Spatio-Temporal Variability of Frost Blisters in a Perennial Frozen Lake along the Antarctic Coast as Indicator of the Groundwater Supply
Full text linkRemote sensing, and unmanned aerial vehicles (UAVs) in particular, can be a valid tool for assessing the dynamics of cryotic features as frost blisters and to monitor the surface changes and the sublimation rates on perennially frozen lakes that host important ecosystems. In this paper, through the use of these remote sensing techniques, we aim to understand the type of groundwater supply of an Antarctic perennial frozen lake that encompasses two frost blisters (M1 and M2) through the temporal analysis of the features’ elevation changes (frost blisters and lake ice level). The frozen lake is located at Boulder Clay (northern Victoria Land, Antarctica). We relied on several photogrammetric models, past satellite images and ground pictures to conduct differencing of digital elevation models, areal variations and pixel counting. In addition, in situ measurements of the ice sublimation or snow accumulation were carried out. The two frost blisters showed different elevation trends with M1 higher in the past (1996–2004) than recently (2014–2019), while M2 showed an opposite trend, similarly to the ice level. Indeed, the linear regression between M2 elevation changes and the ice level variation was statistically significant, as well as with the annual thawing degree days, while M1 did not show significant results. From these results we can infer that the groundwater supply of M1 can be related to a sublake open talik (hydraulic system) as confirmed also by pressurized brines found below M1, during a drilling in summer 2019. For M2 the groundwater flow is still not completely clear although the hydrostatic system seems the easiest explanation as well as for the uplift of the lake ice
D1.1.1: Seismic studies – Input data
No full textThe deliverable is aimed at providing the description of the input data needed for the numerical analyses performed in the Tasks 8.2, 8.3 and 8.4 and devoted to the development of the seismic isolation systems of the ALFRED (Advanced Lead-cooled Fast Reactor European Demonstrator) and ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) reactors. The input data describe both the geometrical and the mechanical aspects of the reactor as well as the seismic input of accelerogram time histories generated according to the characteristics of the reference site of the two reactors
Seismic isolation of lead-cooled reactors: The European project siler
No full textSILER (Seismic-Initiated event risk mitigation in LEad-cooled Reactors) is a Collaborative Project, partially funded by the European Commission in the 7th Framework Programme, aimed at studying the risk associated to seismic-initiated events in Generation IV Heavy Liquid Metal reactors, and developing adequate protection measures. The project started in October 2011, and will run for a duration of three years. The attention of SILER is focused on the evaluation of the effects of earthquakes, with particular regards to beyond-design seismic events, and to the identification of mitigation strategies, acting both on structures and components design. Special efforts are devoted to the development of seismic isolation devices and related interface components.Two reference designs, at the state of development available at the beginning of the project and coming from the 6th Framework Programme, have been considered: ELSY (European Lead Fast Reactor) for the Lead Fast Reactors (LFR), and MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) for the Accelerator-Driven Systems (ADS).This paper describes the main activities and results obtained so far, paying particular attention to the development of seismic isolators, and the interface components which must be installed between the isolated reactor building and the non-isolated parts of the plant, such as the pipe expansion joints and the joint-cover of the seismic gap
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