1,721,419 research outputs found
The beauty and charm Yukawa couplings of the Higgs boson with the ATLAS detector at the LHC - 4D tracking, particle flow and jet flavour reconstruction algorithms development
No full textThis dissertation presents two analyses of Higgs boson processes within the ATLAS experiment at the Large Hadron Collider (LHC). The primary analysis focuses on the legacy process, examining the decays of the Higgs boson into bottom quarks () and charm quarks (). Utilizing data from Run 2, a multi-variate approach with improved b-tagging algorithms was employed to increase sensitivity.
The secondary analysis explores the Di-Higgs process, specifically , investigating the simultaneous production of two Higgs bosons decaying into bottom quarks and photons. This analysis aims to provide insights into Higgs self-coupling, contributing to our understanding of the Higgs potential and Electroweak symmetry breaking.
The performance enhancements discussed are crucial to the success of these analyses. Key improvements include advanced Flavour Tagging techniques, a study on the potential impact of 4D tracking, and a Machine Learning-based approach to the Global Particle Flow (PFlow) algorithm.
Flavour Tagging, essential for identifying jets originating from heavy quarks, has seen significant advancements with the DL1 series tagger algorithms and Graph Neural Networks (GNNs), which provide a more precise classification of jet flavors.
4D tracking, incorporating precise timing information in the tracking system, shows that the object reconstruction of particles can significantly impact vertexing and -tagging algorithms for HL-LHC and beyond.
Global PFlow algorithms, which combine information from various detector components, enable a more accurate reconstruction of the overall event topology.
The dissertation shows that these performance improvements directly reflect on the physics outcomes of the described analyses, bringing us closer to understanding the most fundamental laws of the universe
Computation and experimental validation of the transfer functions of the local control coil system in RFX
No full texthe transfer functions required for the design of the RFX local control system of the field error at the gap were obtained from the frequency response data of Finite Elements models. Comparisons with experimental data were carried out both in the absence and in the presence of plasma. A quite satisfactory performance was observed during the firts tests of the control system
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Politiche di sostegno per il recupero dell'architettura rurale : esperienze di programmazione e applicazione
No full textIl libro raccolglie i contributi di studiosi e tecnici italiani e stranieri sul tema delle possibilità operative per la valorizzazione degli edifici rurali, individuando esempi significativi di valore architettonico, storico e paesaggistico
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