1,722,053 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
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
Simplified template cross-section measurement for Higgs boson decay to b-quarks in association with a vector boson with the full Run 2 CMS dataset
No full textEs wird die Messung des Simplified Template Cross-Section (STXS) des 125 GeV Higgs-Bosons vorgestellt, das in ein Paar von b-Quarks zerfällt, die in Verbindung mit einem Vektorboson erzeugt werden. Die Analyse wird mit den vollständigen Daten des Run 2 durchgeführt, die am Compact Muon Solenoid Detektor (CMS) am Large Hadron Collider (LHC) gesammelt wurden, was einer integrierten Luminosität von 138 1/fb entspricht. Die Analyse wird unter Berücksichtigung der leptonischen Zerfälle des zugehörigen Vektorbosons durchgeführt, während der Higgs-Kandidat entweder aus zwei b-Quark-Jets oder einem fetten b-Quark-Jet rekonstruiert wird, der einem Paar von b-Quarks im Endzustand in verschiedenen kinematischen Regionen entspricht.
Die inklusive Signalstärke und eine aufschlussreiche massenbasierte Cross-Check-Analyse werden auch für den vollständigen Run 2 durchgeführt und die Ergebnisse werden berichtet
Measurement of Higgs boson production in association with a vector boson and decay to b-quarks in the Simplified Template Cross Section framework and interpretations with the Standard Model effective field theory
No full textDiese Dissertation fasst die Querschnittsmessung des Standardmodell-Higgs-Bosons zusammen, das in ein Bottom-Quark-Paar zerfällt und in Assoziation mit einem Vektorboson produziert wird. Die Messung wird unter Verwendung der während Run 2 gesammelten CMS-Daten mit der integrierten Luminositaet von 138 /fb durchgeführt. Der Wirkungsquerschnitt wird in den Simplified Template Cross Sections (STXS) Intervallen der Stufe 1.2 gemessen und in Bezug auf die Operatoren der effektiven Feldtheorie des Standardmodells interpretiert. Sowohl die inklusiven als auch die STXS-Messungen sind mit den Vorhersagen des Standardmodells kompatibel
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
Suche nach schweren Bosonen eines erweiterten Higgs-Sektors in b-Quark-Endzuständen mit dem 2017-Datensatz des CMS Experiments
No full textA search for heavy, neutral Higgs bosons produced in association with b quarks and decaying into a pair of b quarks is presented. It is based on LHC Run 2 data, produced at a center-of-mass energy of 13 TeV in pp collisions and collected by the CMS experiment in 2017, corresponding to an integrated luminosity of 36.02/fb.
Several theories beyond the Standard Model predict additional Higgs bosons and, depending on the specific model, the coupling to b quarks can be significantly enlarged. This is for example the case in the minimal supersymmetric extension of the Standard Model (MSSM) and in the type-II and flipped scenarios of the general Two-Higgs-Doublet Model (2HDM).
A dedicated trigger is utilized to select the events for this analysis. At least three highly energetic jets are required in the final state. Out of these, the two jets with the largest energy contributions are selected as candidates for the Higgs boson decay and the third one is originating from an associated b quark. The invariant mass of the leading two jets is therefore the main observable in this analysis and Higgs boson masses from 300 to 1600 GeV are investigated. To avoid overlap with the complementary semi-leptonic analysis, no muon is required to be present within any final-state jet, leading to an all-hadronic signature.
The dominant background contribution consists of heavy-flavor QCD-multi-jet events and is estimated based on a fully data-driven approach.
No significant deviation from the background-only prediction of the Standard Model is observed. Therefore, limits on the production cross-section times branching fraction of the signal process are calculated. These limits are translated into the parameter space of several specific models, namely the (mA, tan beta) plane for MSSM benchmark scenarios and the (cos(beta − alpha), mA, tan beta) parameter space of 2HDM models.Eine Suche nach schweren, neutralen Higgs-Bosonen, die in Assoziation mit b-Quarks produziert werden und in ein b-Quark-Paar zerfallen, wird präsentiert. Sie basiert auf LHC-Run-2 Daten, die bei einer Schwerpunktsenergie von 13 TeV in Proton-Proton-Kollisionen erzeugt und im Jahr 2017 vom CMS Experiment aufgezeichnet wurden und die einer integrierten Luminosität von 36.02/fb entsprechen.
Mehrere Theorien, die über das Standardmodell hinaus gehen, sagen weitere Higgs-Bosonen voraus und abhängig vom spezifischen Modell kann die Kopplung an b-Quarks signifikant erhöht sein. Dies ist beispielsweise der Fall in der minimalen supersymmetrischen Erweiterung des Standardmodells (MSSM) und in den type-II und flipped Szenarien des allgemeinen Zwei-Higgs-Doublet Modells (2HDM).
Ein speziell entwickelter Trigger wird genutzt, um die Events für diese Analyse zu selektieren. Mindestens drei hochenergetische Jets werden im Endzustand gefordert. Von diesen werden die beiden Jets mit den höchsten Energiebeiträgen als Kandidaten für den Zerfall des Higgs-Bosons ausgewählt und der dritte stammt von einem assoziierten b-Quark. Die invariante Masse der führenden beiden Jets ist daher die Hauptobservable in dieser Analyse und Higgs-Boson-Massen von 300 bis 1600 GeV werden untersucht. Um Überschneidungen mit der komplementären semileptonischen Analyse zu vermeiden, wird gefordert, dass kein Myon in einem der Jets im Endzustand präsent ist, was zu einer vollständig hadronischen Signatur führt.
Der dominante Untergrundbeitrag besteht aus heavy-flavor QCD-Multi-Jet-Events und wird basierend auf einem vollständig datenbasierten Ansatz geschätzt.
Keine signifikante Abweichung von der Untergrundvorhersage des Standardmodells wird beobachtet. Deshalb werden Limits auf das Produkt des Produktionswirkungsquerschnitts und der Zerfallswahrscheinlichkeit des Signalprozesses berechnet. Diese Limits werden in den Parameterraum spezifischer Modelle übersetzt, genauer die (mA, tan beta)-Ebene für MSSM Szenarien und den (cos(beta − alpha), mA, tan beta)-Parameterraum für 2HDM Modelle
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