1,721,555 research outputs found
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
Measurement of the Branching Fraction of the Decay at LHCb and Study on Mighty Tracker for Future LHCb Upgrade
No full textThis thesis reports the branching fraction measurement of the rare decay in the di-lepton invariant mass, , region above narrow resonances, and . The region of interest is defined as . The measurement is performed using 6 fb of proton-proton collision data recorded by the \mbox{LHCb} detector between 2015 and 2018. The measured value of the branching fraction: is obtained using as a normalization channel. The statistical uncertainty is marked as 'stat' and the systematic uncertainty is marked as 'syst'. The systematic uncertainty includes the uncertainty on the branching fractions of the normalization mode which is the component with the highest contribution. The studies of occupancy and forward tracking for future upgrades of the downstream tracking detector of \mbox{LHCb}, known as Mighty Tracker, are discussed in the thesis as well. From the initial occupancy studies, the downstream tracking detector layout has been studied. It has been shown that the maximum occupancy per fiber per event in the outer part of the Mighty Tracker can be achieved in \mbox{Upgrade II} conditions, matching the maximum occupancy in the downstream tracker of the current (\mbox{Upgrade I}) detector. The considered detector geometry includes a silicon made inner detector with a large area of coverage with a drawback of a large potential cost. Regarding the forward tracking studies, it has been found that the average efficiency of 91.0 and a ghost rate of 80.0 can be achieved if no optimization cuts on found tracks are applied. The optimal point of the cut can be chosen based on the distribution of the efficiency and ghost rate as a function of the cut
Future upgrades at LHCb
No full textThe LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1 to cm , and an integrated luminosity of at least 300fb. Modest consolidation of the current experiment are also planned for LS3 (2025). This talk are presenting an overview of the LHCb plans for Upgrade II
Measurement of the Branching Fraction of the Decay at LHCb and Study on Mighty Tracker for Future LHCb Upgrade
Full text linkThis thesis reports the branching fraction measurement of the rare decay in the di-lepton invariant mass, , region above narrow , and . The region of interest is defined as . The measurement is performed using 6 fb of proton-proton collision data recorded by the LHCb~detector between 2015 and 2018. The measured value of the branching fraction:
\begin{align} \mathcal{B}(B^+ \to K^+ \mu^+ \mu^-) = \mathrm{(10.7 \pm 0.2~(stat) \pm 0.3~(syst)) \times 10^{-8}}.\nonumber \end{align}
\noindent is obtained using as a normalization channel. The statistical uncertainty is marked as "stat" and the systematic uncertainty is marked as "syst". The systematic uncertainty includes the uncertainty on the branching fractions of the normalization mode which is the component with the highest contribution.
The studies of occupancy and forward tracking for future upgrades of the downstream tracking detector of LHCb, known as Mighty Tracker, are discussed in the thesis as well.
From the initial occupancy studies, the downstream tracking detector layout has been studied. It has been shown that the maximum occupancy per fiber per event in the outer part of the Mighty Tracker can be achieved in Upgrade~II conditions, matching the maximum occupancy in the downstream tracker of the current Upgrade~I detector. The considered detector geometry includes a silicon made inner detector with a large area of coverage with a drawback of a large potential cost.
Regarding the forward tracking studies, it has been found that the average efficiency of 91.0 and a ghost rate of 80.0 can be achieved if no optimization cuts on found tracks are applied. The optimal point of the cut can be chosen based on the distribution of the efficiency and ghost rate as a function of the cut
Flavour Physics at the High Luminosity LHC: LHCb Upgrade II
No full textThe LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1 to 2x10 34 cm-2 s-1, and an integrated luminosity of at least 300fb-1. Modest consolidation of the current experiment will also be introduced in LS3 (2025). This talk will present an overview of the LHCb plans for Upgrade II and highlight the physics reach of the upgraded experiment for selected physics topics
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
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