1,720,999 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
Decifrare l’invisibile. L’uso dell’RTI per l’analisi e la lettura dei graffiti
No full textIn recent years, the development of non-invasive digital mapping techniques, and in particular Reflectance Transformation Imaging
(RTI), has profoundly reshaped documentation methodologies in the field of epigraphy. This paper presents the case study of Casa IIIM,
in the Hellenistic-Roman quarter of Agrigento, where the application of RTI enabled the analysis and interpretation of a complex corpus
of wall graffiti on plaster, often severely affected by degradation phenomena primarily linked to depositional processes. The results show
how this approach has allowed scholars to recover information and details otherwise undetectable with traditional methods, yielding
significant data for the reconstruction of the historical and archaeological context of Agrigentum, within a perspective that goes beyond
the mere documentation of individual artifacts
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
Physically-based and distributed approach to analyze rainfall-triggered landslides at watershed scale
No full textLandslides are a serious threat to life and property throughout the world. The causes of landslides are various since multiple dynamic processes are involved in driving slope failures. One of these causes is prolonged rainfall, which affects slope stability in different ways. Water infiltrating in a hillslope may cause a rise of the piezometric surface, which, in turn, involves an increase of the pore water pressure and a decrease of the soil shear resistance. For this reason, knowledge of spatio-temporal dynamics of soil water content, infiltration processes and groundwater dynamics, is of considerable importance in the understanding and prediction of landslides dynamics.In this paper a spatially distributed and physically based approach is presented, which embeds a slope failure method in a hydrological model. The hydrological model here used is the tRIBS model (Triangulated Irregular Network Real-Time Integrated Basin Simulator) that allows simulation of most of spatial-temporal hydrologic processes (infiltration, evapotranspiration, groundwater dynamics and soil moisture conditions) that can influence landsliding. Slope stability is assessed by implementing the infinite slope model in tRIBS. The model, based on geotechnical and geomorphological characteristics, classifies each computational cell as unconditionally stable or conditionally stable. Soil moisture conditions resulting from precipitation can trigger landslides at conditionally stable locations. When a landslide occurs, the model also computes the amount of detached soil and its possible path downslope.Model performance has been initially tested on a small catchment with very steep slopes, located in the northern part of Sicily (Italy), after a sensitivity analysis concerning some model parameters
Ricostruzione delle portate naturali liquide e solide e loro uso per la gestione di un invaso
No full textLa presenza di un invaso implica sempre la presenza di un attento monitoraggio di alcune grandezze idrometriche e idrologiche, dalle quali è possibile risalire, con opportuni accorgimenti, al regime delle portate naturali transitate per la sezione di interesse. Con l’ausilio di queste informazioni ci si può pre-figgere di raggiungere un duplice obiettivo: da un lato, confrontando i valori osservati con quelli prevedibili attraverso preesistenti modelli di regionalizzazione, tarati non tenendo in considerazione le informazioni provenienti dall’invaso, fornire una validazione a posteriori del modello regionale. Dall’altro, una volta validate in senso regionale, queste stesse informazioni possono essere utilizzate per consentire modelli di gestione complessa dell’invaso, che tradizionalmente non possono essere effettuati con le usuali tecniche statistiche e idrologiche, ma che richiedono un affidabile modello di simulazione dei deflussi. È questa la situazione in cui ci si viene a trovare, ad esempio, quando si vogliano attribuire finalità di protezione del territorio ad invasi altrimenti dedicati all’approvvigionamento. Con riferimento ad un caso di studio ben documentato, viene ricostruito il regime delle portate naturali in ingresso, vengono ricavate le statistiche relative ai deflussi di piena, ai deflussi di magra ed al trasporto solido, e vengono mostrate sia le potenzialità, sia i limiti consentiti dall’uso di tali conoscenze
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