Search results for "IMPIANTI"
showing 10 items of 797 documents
Risk Assessment of Fuel Quantity Indicator Replacement in ATR72 Aircraft
2015
Aircraft maintenance activities are rife with opportunities for error. The concurrent in-flight failure of all of the engines of a non-scheduled airline flight and the following list of human lives highlight one of these opportunities. As commonly recognized among flight operators, each flight safety agency follows the criteria of the International Civil Aviation Organization Annex 16 in which all the evidences of the technical investigation pave the way for avoiding future flight accidents or incidents. On the other hand, when the Italian penal procedure code was applied for the Tuninter aircraft ATR 72 (identification code TS-LBB) crash at issue on 6 August 2005 near Palermo (Italy), the…
Ni-Based Alloy Nanostructured Electrodes for Alkaline Electrolyzers
In water alkaline electrolyzer field, the development of Nickel-based nanostructured electrode is one of the possible ways to improve the water electrolysis efficiency
Applicazione del metodo Failure Mode, Effects and Criticality Analysis (FMECA) in Tomoterapia: confronto tra approccio classico e metodologia fuzzy
2021
Le analisi di incidenti nel settore radioterapico hanno evidenziato ed evidenziano la necessità di incrementare le misure di garanzia della qualità (QA) a partire dall’identificazione di guasti/errori considerati rari, ma con conseguenze molto severe. In questo ambito, l’applicazione della tecnica Failure Mode, Effects And Criticality Analysis (FMECA) per la classificazione di eventi critici ha riscontrato un grande interesse. Lo scopo del presente lavoro è la comparazione dei risultati ottenuti nell’applicazione di due diverse metodologie FMECA (classica e fuzzy) per la valutazione dei rischi su pazienti sottoposti a trattamenti eseguiti con tomoterapia elicoidale. Il confronto è stato eff…
Development and application of an alternative modelling approach for the thermo-mechanical analysis of a DEMO water-cooled lithium lead breeding blan…
2022
In the frame of the EUROfusion research activities devoted to the design of the DEMO breeding blanket (BB), the Water-Cooled Lithium-Lead BB (WCLL) concept is one of the candidates currently assessed in EU. To this end, an intense research campaign is ongoing to develop a robust geometric configuration for the WCLL BB Central Outboard Segment (COB). Since the current reference design of the WCLL COB segment is not mature enough to allow a full thermal-hydraulic assessment, an alternative procedure aimed at obtaining a thermal field for the whole segment without performing its complete thermal-hydraulic analysis is presented and applied in this work. The scope of the work is to obtain a ther…
Dimensionless Analysis Of Slurry Photocatalytic Reactors Using Two-Flux And Six-Flux Radiation Absorption-Scattering Models
2007
Photocatalytic oxidation (PCO) over titanium dioxide (TiO2) is a "green" sustainable process for the treatment and purification of water and wastewater. However,the application of PCO for wastewater treatment on an industrial scale is currently hindered by a lack of simple mathematical models that can be readily applied to reactor design. Current models are either too simplistic or too rigorous to be useful in photocatalytic reactor design, scale-up, and optimization. In this paper a simple mathematical model is presented for slurry, annular, photocatalytic reactors that still retains the essential elements of a rigorous approach while providing simple solutions. The model extends the appli…
Application of multi-criteria decision making to PMISs assessment
2014
This paper builds on a previous study concerning the assessment and ranking of Project Management Information Systems (PMISs) features and the comparison of a PMISs software sample. In such an application a Multi-Criteria Decision Making (MCDM) tool such as the Analytic Hierarchy Process (AHP) was adopted to get the ranking by neglecting the mutual influence of elements within the structure. The present paper aims at taking into account such influences by relying on the Analytic Network Process (ANP) for the assessment and ranking of features, while the PMISs software assessment has been performed through the AHP via the direct assessment.
Dense-Cloud Atmospheric Dispersion in Complex-Terrain Sites
2003
Misura dell’attività specifica di radionuclidi a lunga vita in alcuni componenti del target di un ciclotrone medicale
2019
La valutazione dell'attività elevata indotta in alcuni componenti del target di un ciclotrone usato per la produzione di radiofarmaci per studi di tomografia a emissione di positroni (PET) è importante per quanto riguarda la protezione dalle radiazioni degli operatori impegnati nella manutenzione, sostituzione e gestione di un target, o suoi componenti. Le attività specifiche sono significativamente elevate da comportare, per scopi radioprotezionistici, una loro classificazione e conservazione in cassaforti schermate in attesa di un loro smaltimento. Tuttavia, dopo alcuni anni, può essere necessario rimuovere le parti più datate per la conservazione di quelle nuove più attive. La fattibilit…
High temperature solid-catalized transesterification for biodiesel production
2010
Biodiesel has become more attractive recently because of its environmental benefits and the fact that it is made from renewable resources. Biodiesel is a mixture of monoalkyl esters of long chain fatty acids derived from renewable feed stock like vegetable oils and animal fats, mainly made of fatty acid glycerides. It is produced by transesterification processes in which oil or fat are reacted with a monohydric alcohol in the presence of a catalyst. The transesterification process is affected by reaction conditions, alcohol to oil molar ratio, type of alcohol, type and amount of catalysts, temperature and purity of reactants. Heterogeneous acid catalysts are quite efficient in promoting the…