1,721,051 research outputs found
Atmospheric Neutrino Search in the ICARUS T600 Detector
Get PDFThe 760-ton liquid argon ICARUS T600 detector performed a successful three-year physics run at the underground LNGS laboratories, studying in particular neutrino oscillations with the CNGS neutrino beam from CERN. This detector has been moved in 2017 to Fermilab after a significant overhauling and will be exposed soon to the Booster Neutrino Beam acting as the far station to search for sterile neutrinos within the SBN program. The contribution addresses the developed methods and the results of an analysis to identify and reconstruct atmospheric neutrino interactions collected by ICARUS T600 in the underground run at LNGS. Despite the limited statistics, this search demonstrates the excellent quality of the detector reconstruction and the feasibility of an automatic search for the electron neutrino CC interactions in the sub-GeV range, as required for the study of the BNB neutrinos at FNAL
STUDIO DEGLI ALGORITMI DI RICOSTRUZIONE DI EVENTI DI NEUTRINO IN ICARUS T600 E IDENTIFICAZIONE DI e/pi0
No full textICARUS T600 is a large mass detector with a high spatial resolution, devoted to the experimental study of neutrinos
(both cosmic and from the CNGS beam), matter stability and, more generally, rare phenomena. The most important
features of this detector are the high granularity, similar to a bubble chamber, and a good calorimetric capability.
These features are obtained with an electronic detector using a large volume of a homogeneous medium. Thanks to its
information redundancy and particle identification capability, ICARUS is ideal for the study of neutrinos, since it allows
to identify the interacting neutrino flavour.
nutau interactions are recognized by means of kinematic selections a la NOMAD, while the particle ID capabilities
allow to distinguish with high efficiency and negligible contaminations the nue CC from the numu NC, by studying
the electrons emitted in the primary vertex.
Some algorithms have been developed in order to distinguish these two classes of interactions,
by discriminating between signals produced by electrons and neutral pions.
In order to clearly distinguish such signals, a good energy reconstruction is necessary; a precise calibration of
the DAQ electronic channels and an accurate measurement of electron lifetime in Liquid Argon are therefore necessary.
In the present thesis, the methods that have been developed both for the calibration of electronic channels and the measurement
of Liquid Argon purity are presented. These methods have first been set-up and applied to the experimental data collected in a small TPC located
in the Legnaro National Laboratory.
Later, they have been modified for the application to the ICARUS T600 detector.
Finally, simulated electron and pi0 events have been considered, in order to study algorithms for the separation of signals from these two particles, by measuring the energy loss in the initial region of electromagnetic showers.ICARUS T600 è un rivelatore di grande massa ed elevata risoluzione dedicato allo studio sperimentale
dei neutrini (cosmici e da fascio CNGS), della stabilità della materia e più in generale degli eventi rari.
Le caratteristiche più importanti di questo rivelatore sono l'elevata risoluzione geometrica,
paragonabile a quella di una camera a bolle, insieme con la possibilità di misura dell'energia depositata.
Queste proprietà sono ottenute con un rivelatore elettronico che utilizza un mezzo omogeneo e di grande massa.
La ridondanza delle informazioni e la possibilità di identificazione delle particelle lo rendono un rivelatore
ideale in particolare per lo studio dei neutrini e consentono l'identificazione del tipo di neutrino interagente.
Le interazioni di nutau possono essere riconosciute con selezioni cinematiche a la NOMAD, mentre
le proprietà di identificazione delle particelle consentono di distinguere con elevata efficienza
e contaminazioni trascurabili i nue CC dalle interazioni di corrente neutra del numu a partire dalla
identificazione di elettroni associati al vertice primario.
A questo scopo sono stati studiati metodi adatti a distinguere questi due tipi di interazione
a partire dalla discriminazione del segnale prodotto
da un elettrone e da un pione neutro. Per ottenere questa separazione è importante in primo luogo ricostruire bene
l'energia e pertanto è necessario ottenere una precisa calibrazione dei
canali dell'elettronica di acquisizione insieme a una misura altrettanto precisa della vita media degli elettroni in Argon Liquido.
In questa tesi saranno descritti i metodi messi a punto sia per la calibrazione dei canali dell'elettronica, sia per la
misura della purezza in Argon Liquido. Tali metodi sono stati in primo luogo sviluppati a partire dai dati
sperimentali raccolti tramite una mini TPC situata presso i Laboratori Nazionali di Legnaro. Successivamente sono stati
generalizzati in modo da essere applicati al rivelatore ICARUS T600 nella sua collocazione ai LNGS.
Infine si sono analizzati eventi simulati di elettrone
e pione neutro per studiare metodi di separazione fra i segnali prodotti da queste due
particelle a partire dalla misura vicino al vertice di interazione ed in particolare dallo studio
della perdita di energia all'inizio degli sciami elettromagnetic
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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