1,721,052 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
Creatine-kinase reference intervals at rest and after maximal exercise in Standardbred racehorses
No full textDue to the high variability of data drawn from the literature, aim of the study was to evaluate the effects of exercise on creatine-kinase (CK) serum activity and to determine CK reference intervals (RIs) at rest and post-exercise in healthy Standardbred racehorses. Data concerning history, physical examination, laboratory evaluation and ECG were collected retrospectively from a population of 258 Standardbred racehorses in training that underwent an incremental-maximal treadmill exercise. Those subjects with alterations potentially influencing CK serum activity were excluded. Finally, a reference sample of 194 horses was selected. Blood samples were collected 1 hour before exercise and 6 hour post-exercise and analysed with a spectrophotometric method. Values were compared by Wilcoxon test for paired samples. The effect of age and sex was evaluated by Kruskal-Wallis and Dunn post-test. Statistical significance was set at P<0.05. RIs were determined following Clinical and Laboratory Standard Institute guidelines (CLSI), approved by the American Society for Veterinary Clinical Pathology. Using a macroinstruction set for Microsoft Excel (RefValAdv), RIs were determined with a non-parametric method. A significant increase (P<0.0001) in CK activity post-exercise was observed. Partition by sex and age did not show any statistical difference, either at rest or post-exercise. In RIs determination no outliers were identified. RIs ranged from 25 to 394 U/l at rest and from 44 to 735 U/l post-exercise. To our knowledge, this is the first study considering CK post-exercise RIs in racehorses using CLSI's guidelines and specific CK-related exclusion criteria. These RIs could be useful to discriminate between physiological and pathological CK post-exercise increase
Immunohistochemical expression of polypeptide specific (TPS) antigen in normal and neoplastic tissue.
No full textEvaluation of the water gas shift reaction in a palladium membrane reactor
No full textThe water gas shift (WGS) reaction of a syngas mixture has been carried out in a tubular palladium membrane
reactor at a temperature of 410–414 ◦C. A composite palladium-porous stainless steel membrane,
29m thick, obtained by electroless plating, has been first extensively tested with pure gases (H2, He,
CO2) and syngas mixtures in the 310–455 ◦C temperature range and up to 800 kPa. Long-term stability of
the membrane inH2 at 400 ◦C has also been checked over a period of 1200 h. The membrane has been then
used for WGS tests in a membrane reactor. The membrane reactor, packed with a pulverized Fe/Cr commercial
catalyst, has been operated at a reaction pressure of 100–600 kPa in the counter-current mode,
with a nitrogen sweep-gas. The reactor has been fed with a shift gas mixture with a 7.6% CO concentration
and H2O/CO ratio in the 2.7–3.6 range. The membrane reactor was able to achieve up to the 85.0% of
CO conversion, while only the 37% as a maximum, was reached with the traditional reactor in the same
operating conditions. Up to the 82% of hydrogen has been recovered with a purity exceeding the 97%
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
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