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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
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Schlussbericht
No full textDas Hauptziel von MiCCuR war die Effizienzsteigerung der Chalkopyrit-Biolaugung von Kupfer (Cu) mittels zweier Strategien, deren grundsätzliche Machbarkeit bereits im Labormaßstab nachgewiesen wurde. Diese sollten weiterverfolgt und auf größere Maßstäbe bis hin zur Demonstration auf einer Pilothalde übertragen werden. Strategie 1 zielt darauf ab, das Redoxpotenzial während der Chalkopyrit-Laugung durch schwache Fe-Oxidierer in einem für die Cu-Auflösung günstigen Bereich zu halten und starke Fe-Oxidierer gezielt aus dem mikrobiellen Konsortium auszuschließen. Strategie 2 nutzt die geringere Toleranz des starken Fe-Oxidierers Leptospirillum ferriphilum gegenüber Chlorid aus. Beide Ansätze wurden in größerem Labor-Maßstab getestet und zuletzt in Pilothalden angewandt. Die Experimente zur Chalkopyrit-Biolaugung wurden von Analysen der produzierten Lösungen und Rückstände ergänzt sowie mit modernsten Proteom-Methoden evaluiert. In diesem Teilprojekt wurde Proteomik entwickelt und angewandt für unterschiedliche Kultivierungsbedingungen und unterschiedliche Zusammensetzungen der Mikroorganismen. Dabei wurden folgende Fragestellungen untersucht: Interspezies-Kommunikation und Einfluss von Signalmolekülen auf Biofilmbildung und Zusammensetzung der mikrobiellen Gemeinschaften, physiologische Veränderung der Organismen und Konsortien durch Laugung unter Salzstress, Stoffwechselwege in den Konsortien und Laugungsleistung in Abhängigkeit von der Temperatur.
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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
Germination behavior of nasturtium Tropaeolum majus L.
No full textThis bachelor thesis focuses on different priming techniques for Tropaeolum majus (T. majus) seeds reaching from mechanical scarification to cold stratification. Furthermore, chemical stratification by using different concentrations of sulfuric acid (H2SO4) (0 %, 47.5 %, 95 %) for three different soak times (5 min, 10 min, 30 min) were also conducted, in the context of an indoor farming project at Fraunhofer UMSICHT. In total two preliminary experiments were done consecutively in a plant growth chamber, sowing on cultivation and potting soil. After that two main experiments were conducted identically to the preliminary experiments, but seeds were additionally sowed in the greenhouse “ALTMARKTgarten” on greenhouse soil. The preliminary test revealed that seed lot harvested in 10/2021 was too old, compared to the main experiments, where seed lot harvested in 06/2023 was used. The boxplot depiction of all main experiments, showed trends toward mechanical scarification, reaching levels between 80 % to 100 % (main no. 3). Except for the main experiment no. 4 sowed on cultivation soil, in which the highest germination percentage (GP) was seen when the seeds were primed with 47.5 % H2SO4 for 10 min (n = 6, on replicate = average of 5 seeds).
Additionally, for the chemical stratification trials response surface methodology (RSM) was conducted, using central composite design (CCD) and an analysis of variance (ANOVA) to de-termine whether the results happened by coincidence or by effect. For all experiments the null hypotheses, saying that chemical stratification has no effect, was rejected, except for the ex-periment sown on cultivated soil (main no. 3), where the chosen model did not fit. It was also investigated whether concentration, soak time or the interaction of both factors contributed to the effect on GP. The results of the ANOVA showed varying results between the soil materi-als and the repetition of the main experiments. Therefore, no statement can be made as to which factor is decisive, as the sample size (n = 6, one repetition average of 5 seeds) was too low and high fluctuations of seed germination were observed in every conducted experiment. Summarizing, not all priming treatment enhance the GP. H2O (= 0 % H2SO4) priming with soak times of 5, 10 and 30 min, showing rates between 0%-60% (except outliers) are not recom-mended. Seeds primed by cold stratification showed varying tendencies in the GP. Neverthe-less, seeds germinated on all tested soil materials (pH = 5-6)
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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