1,721,355 research outputs found
Management und Outcome von Kindern mit komplettem AV-Kanal und Fallot’scher Tetralogie
No full texteingereicht von Simon Jan Waigand, BScMasterarbeit Johannes Kepler Universität Linz 2024Arbeit gesperr
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
Understanding the extent of universality in phytoplankton spatial properties
No full textPhytoplankton are one of the most visible signs of life in our oceans. They also are a key component of the global carbon cycle and of the marine food web. Their complex patterns at the sea surface are routinely seen in satellite images, though the first observations go back centuries.The motivation of this thesis is to explore the spatial properties of phytoplankton. Inspired by ‘universal’ theories for the dynamics of turbulence, several ones have been proposed to explain phytoplankton patchiness as a balance between turbulent stirring by the water and biological processes involving the phytoplankton. The thesis examines the extant theories of plankton patchiness using a novel twin tracer approach, specifically using in situ simultaneous Chlorophyll-a and nitrate measurements from a cruise in the North Atlantic. A significant difference is observed between the variability spectra of the two biochemical variables, an outcome potentially explained only by one theory.More generally, although numerous observations testify to the existence of scaling behaviour of phytoplankton spatial variability, the collation of these studies indicates considerable variability, and hence uncertainty, in the power law behaviour, specifically the value of the spectral ‘slope’. The many different techniques used to evaluate the spectrum, the different sources of data, and the geographical and temporal limitations associated with the data all contribute to adding noise and uncertainties in the estimates for the slope and make a comparison between studies difficult. In this thesis, the existence of the universal scaling properties of phytoplankton are tested over a wide range of spatial (sub-regional and regional) and temporal (few days to a year) scales using in situ, satellite data and model output. For this purpose a robust method is developed that reliably evaluates the spectrum of phytoplankton. A power-law behaviour in the phytoplankton spectrum is consistently found across the sources of data used and the range of scales studied (from 10 m to 130 km). However, stronger universality for the phytoplankton spectrum, defined as constant or uniform slope, is undermined by the significant variability in spectral slope that is consistently demonstrated across the spatial and temporal scales studied
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
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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