1,721,074 research outputs found
Applicabilità di un modello di valutazione del deflusso superficiale nell’analisi di frequenza delle piene
No full textValutazione della piena indice basata sulla derivazione teorica della distribuzione di probabilità delle piene
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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
Effects of Climate and Antecedent Soil Moisture on the Areal Average Abstraction Losses
No full textThe influence of climate on the flood generation process is nowadays a topic of striking impact and particular remark due to the necessity of improving the available techniques and procedures for risk assessments and land protection. In particular great efforts of the recent research are provided to support the flood frequency analysis exploiting the amount of information available by the observation of the frequency of precipitation, vegetation coverage, soil permeability, etc in order to improve the performances of models for flood prediction. The aim of this paper is to focus on links and significant relationships between infiltration models, valid at small scale, and average processes observed at the medium (hillslope) and large (basin) scales, by the light of climate and permeability of soil.
A significant interpretation to the observed relationships observed between total water losses F-A, climate and basin area A is provided. By means of results obtained on basins in Southern Italy, it is possible to conclude that in dry regions rain losses are mainly due to the initial abstraction phenomenon and the estimated values of F-A are quite constant and invariant with basin area, Such findings are consistently matched to what one could expect from Hortonian behavior of soils. Conversely, in humid basins, the values F-A, show a strong relationship with climate represented by a climatic index. In this case, the basin's behavior is consistent with Dunne's model of runoff generation. Those results are supported by the theoretical framework provided by the classical analysis of infiltration in unsaturated porous media
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
Combined approach of laparoscopy and mini-laparotomy for surgery of a voluminous pancreatic cystic lymphangioma.
No full textCystic lymphangioma is a rare disease of lymphatic system; in particular, pancreatic cystic lymphangioma is an unusual localization. A correct differential diagnosis with more common glandular lesions allows to plan a proper therapeutic approach. The Authors report the observed last case, a lesion in the head of the pancreas laparoscopically treated, and discuss this uncommon disease
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