1,720,961 research outputs found
Fattori ambientali che modulano il contenuto di 131I e 137Cs nelle acque reflue urbane in un’area del nord Italia: il caso delle province di Padova e Vicenza
No full textPrognosis following surgical excision in canine and feline malignant skin tumors: the role of the histological evaluation of margins.
No full textWide surgery represents the best therapy for skin tumors, although hampered by local recurrences after incomplete removal. As the clinical assessment of tumor size rarely corresponds to its actual extension, the completeness of surgery can be effectively determined only by the histological evaluation of excision margins.
To assess the efficacy of the histological evaluation of margins in predicting the development of local recurrence, 50 canine and feline surgically-removed skin tumors (21 MCTs, 18 soft tissue sarcomas, 11 carcinomas) have been examined. Margins were judged as clean, clean but close (tumor cells < 2 mm from margins) or infiltrated. Histological grade was assessed in sarcomas and MCTs. Tumor recurrence-free intervals (RFIs) at 1 and 2 years were recorded.
Margins were infiltrated in 19/50 cases (38%), clean but close in 9/50 (18%), and clean in 22/50 (44%). Recurrence occurred in 19 cases. Mean RFI was 233 days (range: 31-661). Recurrence rates were 68.42% (infiltrated margins), 44.44% (clean but close margins), and 9.09% (clean margins). The method accuracy improved with the extension of the follow-up period, and was highest for carcinomas (100%), intermediate for sarcomas (89%) and lower for MCTs (78%), due to actual difficulties in distinguishing if mast cells found on margins are normal or neoplastic.
Histological evaluation of margins is a good predictor for tumor recurrence, although more likely to generate false positives in MCTs. Because of generally long recurrence times, post-surgical surveillance should be extended to at least 2 years. Tumor grade influences RFI but not the method accuracy
A multidisciplinary approach for the investigation of coastal boulder deposits in southern Istria (north Croatia)
No full textThis paper provides a detailed study of coastal boulder deposits (CBD's) that were recently discovered along the southern Istrian coasts at Premantura, and on the nearby islet of Fenoliga. Additional observations have also identified CBD's at the Brijuni archipelago 20 km's to the northwest. The northern Adriatic Sea is a semi-enclosed basin, limiting the number of storm wave capable of the detachment, transport, and deposition of large boulders. However, despite this constraint extensive CBD's are evident.
A multidisciplinary approach was used to investigate the sites including geological and geomorphological surveys, together with the use of an Uncrewed Aerial Vehicle (UAV), digital photogrammetric analysis and swim surveys. Measurements of boulder position, elevation, size, shape and density were carried out recently at the two sites. We recognized and mapped approximately 950 clasts at Premantura and 592 clasts at Fenoliga. At Brijuni several observations have identified that some blocks periodically appear and disappear following severe storm events. Furthermore, we carried out multitemporal monitoring activities at the Premantura test site, identifying the movement of a dozen of blocks primarily during the
extreme low pressure Mediterranean storm Vaia in 2018.
Biogenic marine carbonate encrustations observed on 14 boulders in Premantura suggest the infra- and sublittoral zones as source areas, while for other boulders a subaerial origin is hypothesised. Local topography, together with the stratified limestone bedding planes and dense joint pattern constitute the predisposing factors for boulder size and detachmen
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
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