1,721,002 research outputs found
Does mating group size negatively affect female investment in the simultaneous hermaphrodite APLYSIA punctata?
Full text linkDoes mating group size negatively affect female investment in the simultaneous hermaphrodite Aplysia punctata
No full textSome remarks on Vainikko integral operators in BV type spaces
No full textIn this paper we study Vainikko integral operators which are similar to so-called cordial integral operators and contain the classical Hardy operator, the Schur operator, and the Hilbert transform as special cases. For such operators we obtain norm estimates and equalities, mainly in BV type spaces in the sense of Jordan, Wiener, Riesz, and Waterman. Several examples are also discussed
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
Corneal mineralization as a presenting sign of primary hyperparathyroidism due to a parathyroid adenoma
No full textTo describe a bilateral corneal calcification presumed to be associated with primary hyperparathyroidism in a dog. Methods: An 8-year-old, male mongrel dog with bilateral corneal opacities was evaluated. Complete physical and ophthalmologic examination and laboratory work-up were performed. Results: Irregular, symmetrical corneal opacities in the central corneas were observed bilaterally. A small mass was detected on the left side of the neck, at the level of the thyroid gland. Serum ionic calcium concentration was 2.19 mmol/L (reference interval: 1.29-1.40 mmol/L),serum parathormone concentration was 12 pg/ml (reference interval: 10-44 pg/ml). This value was considered inappropriately high according to calcium concentration. Complete blood count, serum protein electrophoresis, coagulation test and urinalysis were normal. A computed tomography (CT) was performed to further characterize the mass of the neck and staging the patient. CT showed an enlargement with irregular shape of the left cranial parathyroid gland that was surgically removed. Histopathology revealed a rim of compressed parenchyma by an encapsulated, non-infiltrative neoplasm composed of packed cubical cells with eosinophilic cytoplasm. Neoplastic cells expressed chromogranin A and synaptophysin and they were negative for calcitonin and thyreoglobulin. An ophthalmologic diagnosis of a corneal calcification presumably caused by primary hyperparathyroidism due to a parathyroid adenoma was made. Postoperatively the serum calcium levels returned to normal. However, after observation for 1.5 years the corneal opacities, although not increased, were unchanged. Conclusions: Calcific keratopathy has been associated with systemic hypercalcemia. In our case this keratopathy was the presenting sign that allowed to diagnose the underlying endocrine disease
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
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