1,721,092 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
Burden of cardiovascular disease in elderly with Parkinson's disease who start a dopamine agonist agent
No full textIn recent years, some concerns have been raised about the association between the use of pergolide or cabergoline, ergotderived DA, and the development of fibrotic valvular heart disease.
AIM: To characterize the users of ergot-derived DAs and those that are not ergot derived in clinical practice, with particular regard to cardiovascular diseases, using a general practice database.
Of almost 120,000 subjects registered in the lists of 93 general practitioners enrolled, 1-year incident users of ergot- (cabergoline, lisuride, pergolide, and bromocriptine) and non-ergot-derived (pramipexole and ropinirole) DAs who had PD in 2004 or 2005 were selected.
Almost 70% of incident users of ergot-derived DAs were aged 65 and older (less than users
of non-ergot-derived DAs), in contrast with international guidelines.
A higher proportion (20%) of users of ergot-derived DAs have more than three concomitant CV diseases than do users of non-ergot-derived DAs (8%). Patients who start a therapy with ergotderived DAs are more likely (Po.05) to have heart failurethan those who use non-ergot-derived DAs. a significantly higher proportion (Po.05) of patients starting treatment with ergotderived DAs concomitantly received three or more cardiovascular medications than of users of non-ergotderived DAs. Overall, incident users of ergot-derived DAs ( 85% of these being cabergoline users) seem to have a worse cardiovascular profile than users of non-ergotderived DAs.
This finding should be considered in light of the warning of the heart valvular fibrosis risk associated with use of ergot-derived DAs in patients with P
Nonvisible subthreshold micropulse diode laser (810 nm) treatment of central serous chorioretinopathy: A pilot study
No full textPURPOSE. To verify the efficacy of nonvisible micropulse diode laser irradiation in the treatment of central serous chorioretinopathy (CSC). METHODS. Twenty-two patients with CSC for a total of 24 eyes with a disease duration longer than 3 months were included in a prospective study. Patients underwent Early Treatment Diabetic Retinopathy Study visual acuity (VA) examination, dilated ophthalmoscopy, fluorescein angiography, and optical coherence tomography before treatment and during follow-up. Treatment with a micropulse diode laser was given with a duty cycle of 15%. Multiple spots were placed over and adjacent to the area of retinal pigment epithelium leak or decompensation. RESULTS. Mean follow-up was 14 months (range 3-36 months). Powers used ranged from 1 to 2 IN (mean 1.35 W). Mean number of spots was 215 (range 90-400). Fourteen eyes were treated once, nine eyes received two to three treatments, and one eye had five treatments during a follow-up of 3 years. Subretinal fluid was resolved or improved in two third of cases 1 month after laser treatment, and in three-quarters at the end of follow-up. Mean retinal thickness was 328 pm, 197 pm, and 168 pm before, 1 month after irradiation, and at the end of follow-up, respectively. No evidence of RPE or retinal changes due to laser treatment were discernible in most of the eyes. Median VA was 20132 (range 20/100-20/20) before treatment and 20125 (range 20/200-20/20) at the end of the follow-up. CONCLUSIONS. Nonvisible micropulse diode laser may have efficacy in the treatment of CSC. A randomized study with larger series is needed. (Eur J Ophthalmol 2008; 18: 934-40
Cartografia sperimentale e prodromi di una tipologia dei boschi nell’Appennino abruzzese.
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Cartografia sperimentale e prodromi di una tipologia dei boschi dell’Appennino Abruzzese
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