1,720,981 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
Integrated biochemical engineering : strain and process engineering for the production of rhamnolipids
No full textEstablishing biotechnological processes within the envisaged circular bioeconomy requires holistic approaches including an integration of all stages of process development. In this scope, the presented thesis illustrates the integration of strain and process engineering using the example of producing the biosurfactant rhamnolipids with recombinant Pseudomonas putida KT2440. A process-hindering challenge during the production of biosurfactants in aerated bioreactors is excessive foaming. To mitigate this challenge, an in situ liquid-liquid extraction was established by selecting a suitable, biocompatible extraction solvent in a multi-step strategy, including the assessment of product recovery and solvent recycling. A refinement of cultivation parameters was required to enhance functionality of the extraction, in turn influencing the performance of the whole-cell biocatalyst. Unraveling interactions of integrated up- and downstream processing resulted in the definition of a joint operational window. Finally, a foam-free fed-batch cultivation of rhamnolipid-producing P. putida KT2440 with integrated in situ extraction was established. Subsequently, different cultivation modes have been evaluated for enhanced production, and strategies for improved phase separation have been explored. As the microbial boundaries of the operational window are restricting process performance, host engineering was approached to enhance the solvent tolerance of P. putida KT2440, thereby enabling the utilization of additional extraction solvents. P. putida KT2440 was successfully adapted to tolerate high concentrations of 1-octanol. Genome re-sequencing and subsequent reverse genome engineering enabled the construction of tolerant strains capable of producing rhamnolipids in the presence of 1-octanol. Another challenge are transient oxygen limitations in industrial fermentations, which P. putida KT2440 masters well without losing production capacity, thereby highlighting its outstanding suitability for industrial-scale production processes. Previous findings were considered to define an operational window to produce rhamnolipids with recombinant P. putida KT2440 in a custom-designed multiphase loop reactor, integrating cultivation and an in situ counter-current liquid-liquid extraction. Performance indicators compared well with previous two-liquid phase cultivations in stirred-tank reactors, emphasizing the robustness of P. putida KT2440 and serving as a proof of concept for the novel reactor type. In conclusion, this thesis advocates integrated bioprocessing and the urgency for a holistic, interdisciplinary perspective on the overall process development. While the specific outcomes of this thesis are related to the presented system of producing rhamnolipids with recombinant P. putida KT2440, basic concepts and proposed solutions can be extrapolated to other challenging cases in bioprocess development. Thereby, competitive industrial bioprocesses are promoted, eventually contributing to establishing the envisaged circular bioeconomy
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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