1,720,993 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
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
Dynamik von Anionen-Molekül-Reaktionen bei niedrigen Energien
No full textAnion-molecule reactions must find their way through deeply bound entrance and exit channel complexes separated by a central barrier. This results in low reaction rates and rich dynamics since direct pathways compete with the formation of transient intermediates. In this thesis we examine the probability of proton transfer to a small anion and transient lifetimes of a thermoneutral bimolecular nucleophilic substitution (SN2) reaction at well defined variable temperature down to 8 Kelvin in a multipole trap. The observed strong inverse temperature dependence is attributed to the deficit of available quantum states in the entrance channel at decreasing temperature. Furthermore we investigate scattering dynamics of SN2 reactions at defined relative energy between 0.4 and 10 eV by crossed beam slice imaging. A weakly exothermic reaction with high central barrier proceeds via an indirect, complex-mediated mechanism at low relative energies featuring high internal product excitation in excellent quantitative agreement with a statistical model. In contrast, direct backward scattering prevails for higher energies with product velocities close to the kinematical cutoff. For a strongly exothermic reaction, competing SN2-, dihalide- and proton transfer-channels are explored which proceed by complex mediation for low energy and various rebound-, grazing- and collision induced bond rupture-mechanisms at higher energy. From our data and a collaboration with theory we identify a new indirect roundabout'' SN2 mechanism involving CH3-rotation.Anionen-Molekuel Reaktionen muessen ihren Weg durch tiefgebundene Komplexe im Eingangs- und Ausgangskanal finden, die durch eine hohe Zentralbarriere getrennt sind. Dies hat niedrige Reaktionsraten und reichhaltige Dynamik zur Folge, da direkte Pfade mit der Bildung von transienten Zwischenzustaenden konkurrieren. In dieser Arbeit untersuchen wir die Effizenz einer anionischen Protontransferreaktion und Transientenlebensdauern einer thermoneutralen bimolekularen nukleophilen Substitutionsreaktion (SN2 Reaktion) bei wohlbekannter variabler Temperatur in einer Multipolfalle bis hinunter zu 8 Kelvin. Die beobachtete stark inverse Temperaturabhaengigkeit wird der geringen Quantenzustandsdichte im Eingangskanal bei abnehmender Temperatur zugerechnet. Des Weiteren untersuchen wir Streudynamik von SN2 Reaktionen bei wohlbekannter Relativenergie zwischen 0.4 und 10 eV mittels einer Geschwindigkeitsabbildung der Reaktionsprodukte. Eine schwach exotherme Reaktion mit hoher Zentralbarriere laeuft ueber einen indirekten, komplexvermittelten Mechanismus bei niedrigen Reaktionsenergien ab, der hohe interne Produktanregung in sehr guter quantitativer Uebereinstimmung mit einem statistischen Modell aufweist. Im Gegensatz dazu setzt sich direkte Rueckstreuung fuer hoehere Energien durch mit Produktgeschwindigkeiten nah an der kinematischen Grenze. Wir erforschen bei einer stark exothermen Reaktion konkurrierende SN2-, Halogendimer- und Protontransferkanaele, die bei niedrigen Energien ueber Komplexbildung und bei hohen Energien ueber diverse Abprall-, kollisionsinduzierte Bindungsbruch-, und streifende Mechanismen ablaufen. Mittels unserer Daten und einer Zusammenarbeit mit Theoretikern identifizieren wir einen neuen indirekten Kreiselmechanismus fuer SN2 Reaktionen, der die Rotation einer CH3-Gruppe beinhaltet
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