Scientific Open-access Literature Archive and Repository
Not a member yet
16397 research outputs found
Sort by
Measurement of inclusive photon production cross section with ATLAS
Get PDFThe cross section for the inclusive production of isolated prompt photons in proton-proton collisions is measured at √s = 13 TeV, using an integrated luminosity of 139 fb−1 collected with the ATLAS detector at the LHC. The measurement is performed using two criteria for photon isolation: the standard fixed-cone approach and the Frixione isolation prescription. The results show a good agreement
with the theoretical predictions within the experimental and theoretical uncertainties. The content of this article is based on my talk at the 108th National Congress of the Italian Physics Society (12th September 2022) and covers the work of my Master’s Thesis
Performance of Monolithic Analog Pixel Test Structure with Operational Amplifier
Get PDFThe ALICE Collaboration at CERN foresees to replace, during
the LHC LS3, the innermost three layers of the ALICE Inner Tracking System (ITS2) with a new vertex detector composed of bent and ultra-thin monolithic silicon sensors. In this work, the preliminary performance studies of the Analog Pixel Test Structure with an Operational Amplifier output buffer (APTS OPAMP), produced in the 65 nm TowerJazz Panasonic Semiconductor Company (65 nm TPSCo) process, are presented. Results obtained from measurement campaigns with a 55Fe source will be illustrated and discussed. They represent the first step through the validation of the technology and the premise of subsequent in-beam measurements at the Super Proton Synchrotron (SPS) at CERN
Digital rescue of an archaeological site at risk: the prehistoric village of Portella (Sicily)
Get PDFThe prehistoric village of Portella (Salina, Eolian Islands, ME), occupied during the Middle Bronze period, was discovered by chance in the 1950s and excavated in three different phases, from the moment of discovery until 2008. The site is well preserved because, after partial destruction, it was rapidly covered by landslides of volcanic rock. That notwithstanding, the erosive activity had negative effects, too: the lateral erosion of the ridge is destroying part of the village; possibly a portion was already collapsed at the time of discovery. We can consider this erosion an unstoppable process that needs programmatic, continuous monitoring of the site. In the article, we will discuss how it is possible to make one screenshot of the monuments status with the help of new technologies, specifically, photogrammetry through UAVs. To enhance fruition, a virtual tour of the site was also created. This allows people with physical disabilities or reduced mobility to access, though virtually, the site. In conclusion, other possible areas of application of this low-cost and expeditious methodology are suggested, in particular inaccessible or overcrowded sites
A statue of Athena in the sanctuary of Apollo in Hierapolis (Phrygia): from the fragments to the 3D reconstruction
Get PDFIn 2005-2006 the excavations in the Sanctuary of Apollo conducted by the Italian Archaeological Mission in Hierapolis in Phrygia (MAIER) brought to light about sixty fragments of a larger-than-life marble statue of Athena. This paper presents the discovery, highlighting the role played in the research by digital technologies, especially 3D modelling and reconstruction techniques, the application of which mitigated the highly fragmentary nature of the evidence. The first section of the paper highlights the importance of the context of discovery of the fragments, which were found, together with other sculptural and architectural elements, in front of Temple B, in a deposit of discarded material related to the destruction in situ of part of the sanctuary's decorations in the Byzantine period. The second section describes the plan drawn up by the MAIER to publish a comprehensive scientific description of the sculptures of the Sanctuary of Apollo. The project aims to reconstruct the sculptural decoration of the sacred area in the Imperial period, combining information on the types of statuary and the iconographic subjects and themes with excavation data and the epigraphical documentation from the sacred area. The project includes the study of the statue of Athena, for which this paper provides the description and the results of the historic and artistic analyses. The final section is centered on the process that led from the creation of the digital model to the virtual reconstruction of the statue of Athena and, lastly, to the 3D printing of the reconstructive hypothesis. Digital models were created for many of the sculpture fragments of the Sanctuary of Apollo. Saved in a database designed to store data on the sculptures, these models facilitate the study of the documentation and have proved to be extremely useful for the dissemination of the finds to the public, especially in problematic situations that limit or impede access to the evidence, as was the case during the Covid-19 pandemic
Valorizzazione di alimenti funzionali attraverso studi innovativi
Get PDFIl presente lavoro, a cura di Luigi De Masi e Marina Maura Calandrelli, è il risultato del progetto IDENTIQUA rivolto ad aumentare le conoscenze per migliorare l’utilizzo di 5 specie agrarie (Carota viola, Cece nero, Patata viola, Pomodoro nero, e Fagiolo Quarantino di Volturara Irpina) attraverso i risultati ottenuti dalla sperimentazione e dalle analisi di laboratorio relativi al potere nutraceutico e alla identità genetica di questi frutti della terra. Gli obiettivi principali, pertanto, sono quelli di riuscire a dar vita a produzioni agricole dal deciso carattere di genuinità, applicando importanti elementi di conoscenza ed innovazione, avvalendosi del supporto scientifico di istituzioni di elevata competenza. Tra le principali ricadute del progetto, ci sono la possibilità per le aziende agricole del territorio di entrare successivamente in nuove nicchie di mercato, con consumatori più attenti alla qualità, col fine di portare sulle nostre tavole un cibo con caratteristiche nutrizionali superiori che dia sicuri benefici al nostro organismo
The spatial interactions between remains in large dwelling spaces
Get PDFLarge dwelling spaces, characterised by a continuous human occupation and for different practices, represent crucial archaeological contexts in reconstructing the organization of production and consumption activities within prehistoric communities. However, the archaeological record related to such depositional contexts often appears spatially disordered and dominated by a chaotic distribution, the result of the interaction of human and natural agencies over time. On this matter, computer modelling offers a wide range of methods to disentangle the apparent spatial chaos and assess the dynamics behind the distribution of the remains, both those deriving from human activities carried out on the spot and those resulting from later disturbances. In this framework, one of the main issues is the reconstruction of the complex of materials and tools from some human activity. This paper explores the effectiveness of Gcross function analysis to investigate dynamics of interactions between different categories of remains in a large dwelling space, addressing the question of how each category of remains interacts in the space with the others. As a case study, the analysis focuses on a wide area within the Bronze Age fortified settlement of Coppa Nevigata (Southern Italy)
Analisi criminologica e gestione del rischio dei reati contro il patrimonio culturale: mappatura e recenti evoluzioni delle rotte commerciali illecite
Get PDFLa mancanza di un’adeguata regolamentazione del mercato dell’arte nonché la frequente difficoltà nel verificare provenienza e autenticità di oggetti artistici e reperti archeologici intensificano con allarmante assiduità i fattori di rischio relati ai beni culturali. A partire dagli scavi non autorizzati, fino ad arrivare a furti, saccheggi, contraffazioni e importazioni illegali, i proventi di tali attività, che originano dai paesi artisticamente e archeologicamente più ricchi di risorse, approdano – a seguito di numerosi passaggi transfrontalieri – fino ai mercati occidentali. L’articolo analizza le principali connotazioni criminologiche del fenomeno, rilevando come gli operatori del mercato possano svolgere il ruolo di organizzazione-ponte tra il dominio legale e quello illegale. Fornendo libero accesso alle reti criminali nella commercializzazione dei beni illecitamente sottratti, attribuendo a questi ultimi una falsa provenienza e, conseguentemente, un’elevata redditività, i suddetti operatori sono in grado di favorire transazioni che sottintendono schemi fraudolenti
Measurement of the production of a W boson in association with a charm quark at √s = 13 TeV with the ATLAS detector
Get PDFThe production of a W boson in association with a charm quark has been investigated since the Tevatron era, because of its connection with the strange quark PDF. This process is the most probable production from strangegluon scattering, therefore the cross section gives direct information about strange distribution. At LHC, ATLAS and CMS have already performed a complete analysis of the Run-1 (2009–2013) and obtained interesting results about the contribution of strange quarks inside protons. In particular, the strange PDF is compared with the other light quarks up and down, which are expected to be in the same contribution as the strange quark. Results from analysis are mostly in agreement with theory, but still they need more investigation with higher statistics. ATLAS, in fact, is
working to provide a new result after the Run-2 data (2015–2018). In this paper, a short overview of the published analyses is presented and some information on the ongoing one by ATLAS is given
Estimation of contact lens friction coefficient: The need for a protocol
Get PDFContact lens discomfort (CLD) is a sporadic or frequent condition that affects millions of contact lens users worldwide. The experience of the contact lenses (CLs) wearers is strongly influenced by many factors, among these the physical properties of lens materials. Especially, the friction coefficient (CoF) plays a critical role in the balance between lenses and ocular environment. The aim of our study is to quantify the CoF for different CLs by means of a nano-tribometer. Three experiments were performed following protocols already published in the literature, in order to evaluate the CoF dependance on testing parameters, such as sliding speed, applied normal force and number of sliding cycles. Our results identify a lack in the reproducibility of already published experiments and the necessity to identify a measuring standardized protocol
Comparison of visual performance between a single- and a dual-focus contact lens for the control of myopic progression
Get PDFMyopia is a globally widespread ametropia. This has motivated the development of approaches to slow myopic progression, including the use of specific dual-focus contact lenses for myopia control. In this study, the visual performance of a dual focus contact lens (MiSightTM) and a single vision contact lens (Bausch & Lomb Ultra) was compared. To this aim, 25 myopic subjects were recruited (Sp from −0.50 D to −6.00 D, with max astigmatism of 1.00 CD). During the visit, the monocular and binocular visual acuity without correction was recorded, and the to- tal topoaberrometry was performed. Subsequently, for each subject, monocular and binocular low-contrast visual acuity and high-contrast visual acuity was addressed with both type of lens. Visual quality was objectively evaluated by performing total ocular aberrometry. The results allow evaluating the effect of dual focus contact lens on vision