1,721,031 research outputs found
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
The beam transport system for the Small Quantum Systems instrument at the European XFEL: optical layout and first commissioning results
No full textThe Small Quantum Systems instrument is one of the six operating instruments of the European XFEL, dedicated to the atomic, molecular and cluster physics communities. The instrument started its user operation at the end of 2018 after a commissioning phase. The design and characterization of the beam transport system are described here. The X-ray optical components of the beamline are detailed, and the beamline performances, transmission and focusing capabilities are reported. It is shown that the X-ray beam can be effectively focused as predicted by ray-tracing simulations. The impact of non-ideal X-ray source conditions on the focusing performances is discussed.Deutsche Forschungsgemeinschaft https://doi.org/10.13039/501100001659Volkswagen Foundation https://doi.org/10.13039/501100001663Horizon 2020 Framework Programme, European Metrology Programme for Innovation and Research https://doi.org/10.13039/100014132Deutsche Forschungsgemeinschaft https://doi.org/10.13039/50110000165
Kohärenzeffekte in der Valenz-Photoionisation kleiner Moleküle
Get PDFKohärenzeffekte in der Valenz-Photoionisation kleiner Moleküle Die Untersuchung von Kohärenzeffekten in der Valenz-Photoionisation kleiner Moleküle ermöglicht Einblicke in molekulare Strukturen und Dynamiken und gibt dadurch Aufschluss über einige fundamentale quantenmechanische Prozesse. Der Schwerpunkt dieser Arbeit liegt auf derartigen Studien. Mittels Synchrotronstrahlung und der winkeldifferenzierenden Flugzeitanalyse von hierbei emittierten Photoelektronen werden molekulare Zwei-Zentren-Interferenzen für die Valenzelektronen der homonuklearen, diatomaren Moleküle N2 und O2 untersucht. Es wird gezeigt, dass durch die Inversionssymmetrie dieser Moleküle und die resultierende Unbestimmbarkeit des Emissionsortes der Photoelektronen Interferenzen auftreten. Die winkelaufgelöste Photoelektronenstudie in einem sehr großen Photonenenergiebereich von 20 bis 600 eV , die in dieser Arbeit vorgestellt wird, zeigt erstmalig sogenannte 'Cohen-Fano Oszillationen' in der Winkelverteilungsanisotropie. Es werden zudem weitere relevante Effekte der kohärenten Photoelektronenemission vorgestellt und im Lichte der gewonnenen experimentellen Daten analysiert. Eine energetisch hoch auflösende Studie von N2 und O2, besonders im niederenergetischen Photonenenergiebereich von 20 bis 50 eV, zeigt des Weiteren bisher unentdeckte Resonanzphänomene, die höchstwahrscheinlich verschiedenen Arten der Doppelanregung zuzuschreiben sind. Ausblickend wird eine Analyse für das polyatomare heteronukleare Molekül CH4 von 20 bis 300 eV vorgestellt, um eine Diskussion über molekulare Multi-Spalt-Systeme anzustoßen.Coherence Effects in the Valence Photoionization of Small Molecules Coherence effects in the valence photoionization of small molecules deliver insight into molecular structures and dynamics which in turn allow to unravel details of fundamental quantum mechanical processes. The work presented in this dissertation primarily deals with such investigations, using third generation synchrotron radiation. The applied technique is angle resolving photoelectron time-of-flight spectroscopy. It is shown that due to the inversion symmetry of homonuclear diatomic molecules like N2 and O2 an indistinguishability of the electrons and corresponding delocalization leads to interference pattern in the angular distribution anisotropy. Such two center interferences are determined in a wide photon energy range from 20 to 600 eV in the valence photoionization angular distribution anisotropy. The observed oscillations will be discussed in the light of the Cohen-Fano formalism. The relevant photoionization dynamics of the broad photon energy study will be discussed. In this context, a high energy resolution study of N2 and O2 is presented for the low photon energy region from 20 to 50 eV, showing hitherto unexplored resonance phenomena most likely originated by different types of doubly excited states. In order to initialize a discussion about more complex molecular multi-slit systems, an angle resolving study from 20 to 300 eV is presented for the heteronuclear polyatomic molecule CH4
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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