1,721,079 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
Viel Rauch um kalte Brände : Forscher der Universität Karlsruhe untersuchen Gebäude der Frieder Burda Stiftung im Modell.
No full textEine experimentelle Methode zur Untersuchung von Raumluftströmungen in einem stark verkleinerten Modellraum: Entwicklung und Anwendung
Full text linkIn der vorliegenden Arbeit wurde ein Verfahren zur experimentellen
Untersuchung nicht-isothermer Raumluftströmungen in einem stark
verkleinerten Modellraum unter Berücksichtigung aller
Ähnlichkeitskennzahlen entwickelt. Mit diesem Verfahren konnte erstmals
eine sehr hohe Genauigkeit bezüglich der Ähnlichkeitskennzahlen
Reynolds-Zahl Re, Rayleigh-Zahl Ra, Prandtl-Zahl Pr sowie der
Archimedes-Zahl Ar erreicht werden. Die Anpassung der Randbedingungen an
den Modellmaßstab erfolgt bei dieser Methode über die Anpassung der
Materialeigenschaften eines beliebigen Arbeitsgases durch Erhöhen des
Drucks p. Dieses Verfahren konnte in der weltweit einzigartigen
Experimentieranlage SCALEX (SCALEX = scaled convective airflow laboratory
experiment) umgesetzt und auf zwei Beispielproblemstellungen der
Raumluftströmung (isotherme sowie gemischte Konvektion) erfolgreich
angewendet werden. Dazu wurden die Geschwindigkeitsverteilungen der
groß-skaligen Strömungsstrukturen in einem im Maßstab von 1:10
verkleinerten Modellraum hinreichend komplexer Geometrie für den Fall
isothermer sowie gemischter Konvektion untersucht. Die
Geschwindigkeitsmessungen wurden mit einem 2D-laser Doppler velocimetry
System durchgeführt. Als Arbeitsgas wurde Schwefelhexafluorid (SF6) bei
einem Druck von p = 4.517bar verwendet. Die Ergebnisse der vorliegenden
Arbeit sowie die neu entstandene Anlage tragen zu einem umfangreichen
Verständnis sowie einem vereinfachten experimentellen Zugang zum komplexen
Themengebiet der Raumluftströmungen bei.In the present work a new experimental method for the investigation of
non-isothermal indoor airflows in a reduced scale model room with respect
to the full set of dimensionless numbers has been developed. The method
provides a high accuracy with respect to the dimensionless numbers Reynolds
number Re, Rayleigh number Ra, Prandtl number Pr and Archimedes number Ar.
The adjustment of the boundary conditions to the chosen scale is achieved
by adjusting the material properties of a working gas by increasing its
pressure. The technical realization of this theoretical approach could be
demonstrated by setting up the worldwide unique experimental setup, the
SCALEX-facility (SCALEX = scaled convective airflow laboratory experiment)
and applying it to two exemplary problems (isothermal and mixed convection)
of indoor airflow research. For this purpose the velocity distributions of
the large-scale flow structures have been investigated in a 1:10 scale
model room with sufficient high complex geometry. The velocity measurements
were performed using a 2D laser Doppler velocimetry system. Sulfur
hexafluoride (SF6) at a pressure of p = 4.517bar have been used as working
gas. The results of the present work as well as the set up SCALEX-facility
account for a comprehensive understanding and an easy experimental access
to the complex subject of indoor airflow research
"Wie können Bäume dem Sturm trotzen?" : Internationale Konferenz zum Thema "Sturm & Wald" an der Universität Karlsruhe.
No full textDispelling 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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