1,176 research outputs found
Testare il Modello Standard con misure di precisione del sapore tramite l'esperimento di ATLAS
No full textATLAS è uno dei principali esperimenti al Large Hadron Collider (LHC), situato al CERN, in Svizzera. In tredici anni, ATLAS ha ottenuto notevoli risultati, tra cui la scoperta del Bosone di Higgs nel 2012, ma il Modello Standard è ancora oggetto di studio. In quest'ottica, il riconoscimento del sapore dei quark ha un ruolo importante per identificare processi interessanti. In questa tesi, la misura del bosone W prodotto in associazione con un quark charm è l'argomento principe. In questa analisi, la determinazione del sapore dello charm e del quark strange nel protone, da cui deriva la produzione del W e dello charm, sono di fondamentale importanza, sia per la misura della sezione d'urto, sia per migliorare la precisione sulla strange distribution function. In questa tesi, verranno esposte tutte le tecniche di analisi sviluppate per la misura del processo, riportando i risultati finali della sezione d'urto differenziale e totale con relative incertezze statistiche e sistematiche. La seconda parte del lavoro di dottorato concerne la problematica di riconoscimento di un singoletto di colore, come il bosone di Higgs, da un'altra configurazione, come un gluone, sfruttando la definizione di variabili sensibili al colore, a partire dall'identificazione del sapore di due b-quark. In questa tesi verranno esposti i risultati promettenti, i quali sono stati pubblicati in un articolo.ATLAS is one of the main experiments at the Large Hadron Collider (LHC), located at CERN, Switzerland. In thirteen years, ATLAS has achieved notable results, including the discovery of the Higgs Boson in 2012, but the Standard Model is still under study. From this perspective, the recognition of quark flavour plays an important role in identifying interesting processes. In this thesis, the measurement of the W boson produced in association with a charm quark is the main topic. In this analysis, the determination of the flavour of the charm and the strange quark in the proton, from which the production of the W and the charm derives, are of fundamental importance, both for the measurement of the cross section and for improving the precision on the strange distribution function. In this thesis, all the analysis techniques developed for measuring the process will be exposed, reporting the final results of the differential and total cross section with related statistical and systematic uncertainties. The second part of the doctoral work concerns the problem of recognising a color singlet, such as the Higgs boson, from another configuration, such as a gluon, exploiting the definition of color-sensitive variables, starting from the identification of the flavour of two b-quarks. In this thesis the promising results will be exposed, which have been published in an article
Advanced management for resilient and sustainable Multi-Energy Systems
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
Salvaguardia della biodiversità vegetale: il lampascione [Muscari comosum var. comosum (L.) Miller], una specie da valorizzare
No full textA review on multi energy systems modelling and optimization
No full textOver the past decade, energy systems for the combined management of power vectors have been attracted the
attention of the scientific community. Most of the published works aim at finding optimal design and operations
of Multi Energy Systems (MES). In these works, the basic structure and assumptions of the formulation are often
taken for granted. Consequently, approaching MESs for the first time, understanding how to guarantee the
desired optimization detail with proper computational expenses, is a challenging and time-consuming task. The
present work presents a novel approach to the analysis of the MES literature, since it is devoted to guide a
practical development of MES optimization. Through the discussion of six case studies, the mathematical
formulation is presented to provide a clear reference to build the model. Emphasis is placed on how the aspects
investigated can change the nature of the problem and the choice of the solvers for the process execution. For
each of these aspects, a literature review to identify and discuss the main proposals for its implementation is
presented. Finally, a great attention is posed on the inclusion of thermal networks and storage in the optimization
of multi-energy systems, discussing the different approaches used in the literature
Giulia Veronica Varisco
No full textThe headword explains the biography and the contribution of the author Giulia Varisco to the children's literatur
Optimal Integration of Renewable Sources and Latent Heat Storages for Residential Application
No full textGiven the large amount of energy required in the building sector, an interesting opportunity to reach future sustainable energy systems is the path towards low energy buildings. This work proposes an approach for optimally integrating building-scale energy technologies (both traditional and renewable) to enhance the transformation of the existing buildings (often energetically inefficient) in low-carbon systems. The approach promotes a transition sustainable from both the economic and environmental perspectives. Both operation and design optimization are considered with the aim of suggesting the best set of capacity of the technologies to be installed taking into account the expected operations. The building-scale technologies are integrated with proper storage units: Li-ion batteries and thermal storage (latent heat, that requires low installation space). As a dispatchable renewable technology, a biogas small-scale combined heat and power unit is included in the system. Once the key role played by this component in meeting the loads is proved, an analysis of the impact of the cost of the primary energy carrier of this technology on the system design is carried out. Two optimization approaches have been adopted (both based on non-linear programming). Results show that operation costs can be reduced by up to 29%. The adoption of a combined approach that takes into account both operation and design optimization lead to a reduction in installation and operating costs by up to 27%. In the analyzed cases, the use of the combined optimization confirms that latent heat storage is more suitable to be installed than electric storage (about −4.5% cost)
Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
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Open AccessArticle
Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
by Giulia Di Iorio,Laura Paglia *ORCID,Giulia PedrizzettiORCID,Virgilio GenovaORCID,Francesco MarraORCID,Cecilia BartuliORCID andGiovanni PulciORCID
INSTM Reference Laboratory for Materials and Surface Engineering, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
*
Author to whom correspondence should be addressed.
Coatings 2023, 13(9), 1602; https://doi.org/10.3390/coatings13091602
Original submission received: 10 August 2023 / Revised: 31 August 2023 / Accepted: 11 September 2023 / Published: 13 September 2023
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Abstract
SiC/SiC ceramic matrix composites (SiCf/SiC CMCs) are regarded as the new materials for the hot-section components of aircraft gas turbine engines, since they have one-third of the density of metallic superalloys, a higher temperature capability, good mechanical strength, and excellent thermal shock resistance. However, high-temperature water-vapor-rich combustion gases can induce severe surface recession phenomena in SiC/SiC leading to component failure. For this reason, it is necessary to design protective coatings, i.e., environmental barrier coatings (EBCs), able to protect the SiC/SiC surface in combustion environments. In the present work, ytterbium monosilicate (Yb2SiO5), stable when exposed to water vapor at high temperatures, and ytterbium disilicate (Yb2Si2O7), characterized by a thermal expansion coefficient closer to that of the substrate, were selected for a multilayer EBC system. EBCs were processed using the atmospheric plasma spray (APS) technique. A set of deposition parameters were tested, varying the power of the torch, and the composition and microstructure of the deposited coatings were studied in terms of porosity, crack density, and post-deposition phase retention by performing SEM, EDS, and XRD analysis. The results allow for the definition of the influence of deposition parameters on the final properties of multilayer EBC coatings
Caratterizzazione qualitativa di bulbi di Muscari comosum var. comosum L..
No full textLe esigenze salutistico-nutrizionali dei consumatori nonchè il bisogno di una identificazione nella storia, cultura e tradizione di un territorio sono notevolmente aumentati negli ultimi decenni. Il consumo di specie spontanee, come il Lambascione (o Lampascione) (Muscari comosum var. comosum), è in continua crescita, soprattutto in virtù della tipicità legata alla tradizione nell’utilizzazione culinaria di questo prodotto. Il lambascione è una specie appartenente alla famiglia delle Liliaceae, nota sin dall’antichità, un tempo ampiamente diffuso in Puglia nelle zone incolte; recentemente esperienze di coltivazione stanno interessando il territorio costiero della Capitanata, caratterizzato da terreni leggeri, vocato alla coltivazione di specie orticole da organi sotterranei (carote, bulbose come cipolla e aglio).
La parte edule è rappresentata dal bulbo, particolarmente apprezzato per il caratteristico sapore amarognolo, utilizzato cotto come pietanza invernale, e sottoforma di conserva durante tutto l’anno.
Evidenze sperimentali reperibili in letteratura, sia pur scarse e poco recenti, hanno messo in evidenza interesanti proprietà nutrizionali di questi bulbi (elevati livelli di glucosidi e composti fenolici, basso contenuto di ossalati). A sostegno di un processo di valorizzazione di questa specie esempio della biodiversità vegetale pugliese, è stato condotto un lavoro preliminare di caratterizzazione morfo-qualitativa del bulbo attraverso la determinazione di sostanza bioattive con effetti sulla salute e sul benessere del consumatore (sostanza secca, fibra alimentare, vitamina C, contenuto di fenoli totali)
Correction to: Safety and Psychological Outcomes of Tandem t:Slim X2 Insulin Pump with Control-IQ Technology in Children, Adolescents, and Young Adults with Type 1 Diabetes: A Systematic Review
No full textThe second author name was incorrectly published as Giula Maria Smylie. The correct name is Giulia Marie Smylie. The original article has been corrected
Scrivere senza anestesia. La chiarezza di Giulia Niccolai
No full textIl saggio colloca storicamente la narratrice e poetessa Giulia Niccolai nel canone del Novecento letterario italiano discutendone poetica e cifre stilistiche. L'ampia analisi proposta tocca tutte le opere dell'autrice evidenziandone i legami intertestuali, anche tra poesia e narrativa, e i progressivi sviluppi in un arco cronologico esteso, tra anni Sessanta e primi anni Duemila. Lo studio coglie anche l'importanza dei riferimenti alle arti visive, in particolare alla fotografia, che Giulia Niccolai ha praticato in prima persona negli anni della Neoavanguardia, e alla pittura americana.The essay places the narrator and poet Giulia Niccolai in the canonical twentieth century Italian literary discussing her poetics and stylistic figures. The wide analysis proposed touches all the works of the author highlighting the intertextual links, also between poetry and narrative, and the progressive developments in an extended chronological period, between the Sixties and early Twenties. The study also captures the importance of references to the visual arts, especially photography, which Giulia Niccolai has practiced in the years of the Neo-avant-garde, and to American painting
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