1,720,964 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
Analysis of GEM Properties and Development of a GEM Support Structure for the ILD Time Projection Chamber
No full textIn the concept of the International Large Detector (ILD), developed for the International Linear Collider (ILC) a Time Projection Chamber (TPC) is envisaged as main tracking detector.Such gaseous detectors have to be equipped with amplification devices in order to enlargethe amount of charge, which is set free by ionization caused by traversing charged particles.Micro Pattern Gas Detectors (MPGDs) will be used in the ILD TPC as amplification stage. Inthis thesis, Gas Electron Multipliers (GEMs) – one specific MPGD species – are analyzed concerning various properties. Effective gains and energy resolutions are compared for GEM foilsproduced by different manufacturers. A good understanding of these observables is obtainedby interpretation of the results with the help of geometrical parameters. Height profile measurements of GEM foils have been performed for the first time and the impact of non perfectflat GEMs is analyzed, especially on dE/dx determination and drift field quality. The resultsemphasize the need of a flat installation of GEMs in TPCs. As a consequence, a new mountingdevice has been developed to ensure flatness and to provide a method to cover large readoutareas, as in the ILD TPC, by introducing the least possible amount of dead material into thedetector. The developed structure has been tested in a TPC protoype, taking cosmic muondata. The influence of the mounting on track reconstruction, single point resolution, trackingefficiency and dE/dx measurements is quantified. The developed mounting is applicable in alarge scale TPC, if some design considerations are taken into account
- …
