1,721,231 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
The QSO HE1013-2136 (z = 0.785): Tracing the ULIRG-QSO connection towards large look-back times?
No full textDeep BRIH-images as well as long-slit spectra taken with the ESO-2.2m and VLT-telescopes of the QSO HE1013-2136 (z = 0.785) are presented. They show the QSO apparently in the last phase of a 1:3 merger. Two tidal tails extending 9" and 3.5" (68 and 26 kpc) and several condensations within 3.5" projected distance are clearly detected. The latter could be companion galaxies to the QSO or debris of a merger remnant. Due to the complexity of the system, the morphology of the host galaxy is not well constrained, however, the host galaxy seems to be as bright as 2--3 L*. The I- and H-band images of HE1013-2136 show remarkable differences, which are hard to asses. At present it cannot be ruled out that one of the merging galaxies formed a ring-like structure. The spectrum of the QSO shows it to be an extreme Fe II emitter, which is typical for IR-bright QSOs. At least one of the nearby condensations is most likely at the same redshift as the QSO, however, no signs of (post)starburst activity seen in many nearby interacting QSOs are detected. HE1013-2136 shows many similarities to the low-redshift (z = 0.29) intermediate QSO PG 1700+518 and could thus be a unique probe of the ULIRG-QSO connection at large look-back times
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
Ultrastructural localization of hair keratin homologs in the claw of the lizard Anolis carolinensis
No full textThe ultrastructural localization of two hair-like keratins has been done fot the claw of the lizard A. carolinensis. It has shown that the transitional and the corneous layers contain both hard keratins and keratin associated beta-proteins
Prospecting for biocatalysts and drugs in the genomes of non-cultured microorganisms
No full textModern biotechnology has a steadily increasing demand for vitamins, antibiotics and, in particular, novel biocatalysts for use in the production of flavors, agrochemicals, pharmaceuticals and high-value fine chemicals. Novel experimental approaches are being developed in attempts to identify such molecules. However, it is known that up to 99.8% of the microbes present in many environments are not readily culturable; hence, they cannot be exploited for biotechnology. The 'metagenome technology' offers a solution to this problem by developing culture-independent methods to isolate, clone and express environmental DNA. So far, metagenome-based approaches have led to the isolation of many novel biocatalysts and a variety of other molecules with a high potential for downstream applications
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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