1,720,960 research outputs found
ANALYSIS OF BEECH WOODS OF SIMBRUINI-ERNICI MOUNTAINRANGE (CENTRAL APENNINE) USING ELLENBERG INDICATORS
No full textIl Museo Paolo Orsi di Siracusa. Un progetto Pilota con Google. Virtual tour a 360° del museo e di reperti archeologici in modalità Street View
No full textThe aim of this paper is to offer a preview of the pilot project at the “Paolo Orsi” Regional Archaeological Museum of Syracuse (Italy). Thanks to a free partnership with Google Business Photos/Street View Indoor, we managed to map the entire museum, the only archaeological museum in South Italy that can be visited online on a 360° tour on a Google platform, with a dozen archaeological finds which can be clicked as POIs from the museum windows and explored, taking 360° virtual tours, provided with descriptive sheets. The aim of the project is is to begin to bridge the gap of Sicilian Cultural Heritage’s visibility on the web
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
Is there any relationship between photodynamic therapy for exudative age-related macular degeneration and choroidal neovascularization recurrence? A rationale for combined treatments
No full textPurpose. Photodynamic therapy (PDT) is the treatment of choice for subfoveal choroidal neovascularization (CNV) in age-related macular degeneration (ARMD). Interpretation of PDT mechanism of action is not yet fully understood and causes of CNV recurrences are unclear. The authors have conducted a retrospective analysis of fluorescein and indocyanine green angiographies in patients treated with multiple PDT in order to identify risk factors for recurrence. Methods. A total of 342 eyes of 342 patients (207 women and 135 men) with ARMD and subfoveal CNV were treated with at least two PDT. Angiographic (fluorescein and indocyanine green) features of recurrences were confronted to pretreatment examinations in all patients. Results. Post-PDT angiographies showed in all eyes a dark circle corresponding to the laser spot even 1 year after treatment. Persistence or progressive regrowth of CNV developed in an area adjacent or corresponding to the original lesion, without any specific relationship with the location of fluorescein and indocyanine green late leakage or with presence of abnormal fluorescence due to pigment abnormalities. At the 3-month angiographic follow-up, 23 patients (6.7%) showed a recurrent CNV resembling shape and dimension of the laser spot used for the PDT treatment. Conclusions. The authors failed to identify angiographic signs helpful to predict the risk of CNV persistence or recurrence. PDT leaves minor but persistent changes in the choroidal vasculature within the treatment area. In some cases, the recurrent CNV seems to be related to the laser spot of the PDT
Resonance Raman measurement of macular carotenoids in a European population
No full textPurpose: Increasing evidence has linked the Macular Pigment (MP) to the risk of age–related macular degeneration (AMD). This study quantifies the MP using Resonance Raman Spectroscopy (RRS) and compared MP levels in the young and the elderly, including those with age–related macular degeneration, in subjects from a Mediterranean area.
Methods: Sixty–nine eyes from 69 subjects (age range = 25–80 years) living in the Veneto Region have been recruited for this study; 39 subjects had no retinal lesions (among these 7 were pseudo–phakic) and 30 were patients with early non–exudative AMD in the eligible eye. RRS has been obtained by illuminating the macular area for 0.25 seconds with a 1–mm spot of 488–nm, 1.0–mW argon laser light.
Results: Among normal individuals the MP level shows a significant decline with age and the population’s values are best fit with an exponential curve (R2=0.39, p<0.05). We also divided this sample into 2 subgroups, one with subjects whose age was 55 years or less and the other with subjects over 55 years. In the younger subgroup the Resonance Raman Intensity (counts+SD) was 2136+789, significantly higher than the older subgroup (1231+461, p<0.0001). Pseudo–phakic subjects with no retinal signs of AMD had MP levels within normal values (1248+612). Among patients with early non–exudative AMD the Raman signal evidenced a statistically significant reduction (871+522) compared to age–matched normal individuals (p<0.011). This observation accounts for a 29% decrease of the MP among patients with early AMD.
Conclusions: Normal young subjects show a wide variation of MP levels as measured by the RRS. As age increases, an exponential reduction of macular carotenoids is apparent, even without clinically evident signs of AMD. The MP is significantly lower in the patients with early non–exudative AMD, compared to age–matched controls. These data confirm other studies carried out with the RRS, even though are in contrast with other studies made with flicker photometry which suggest that MP does not change with age, even when elderly subjects with AMD are considered. This difference could be explained by the need of a good compliance for psycophysical tests, such as flicker photometry, compared to more objective measurements such as given by the Raman method. Also, by comparing the data of this study within aged normals to other studies carried out in United States, it is evident that European population has a higher amount of carotenoids as measured by Raman (p<0.0001). This supports the hypothesis that genetics, diet and environment could account for the difference of the prevalence of AMD in Europe
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
- …
