1,720,978 research outputs found
The slope aspect: A predisposing factor for landsliding?
No full textThe influence of slope aspect on the distribution of landslides was studied in the Milia and Roglio basins in Tuscany, Italy. For each basin, the new Tuscany region landslide inventory that was initiated in 2010 was used. The landslides were split into separate datasets based on their prevailing movement typology. To assess the results that were obtained from the different slope aspect values, maps of the lithology, slope angle, distances to streams, and distances to tectonic lineaments were included in the bivariate statistical analysis as comparison terms. For each basin, all of the geo-environmental factor maps were compared with the different landslide typologies with GIS software. Pearson's Chi(2) (chi(2)) coefficient was used to test the degree of spatial association between each predictor variable and landslide type. In addition, Cramer's V test was used to quantify the strength of the degree of association. Next, a conditional analysis was applied to all of the possible combinations that occurred between the slope aspect and other landslide-predisposing factors. Overall, the slope aspect significantly affected the distribution of superficial landslide types, but apparently not that of other landslide types. (C) 2013 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved
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
Ipotesi su un approdo alla foce del Carrione
No full textLa città di Luni, come ci testimonia Strabone (Geografia, L'Italia. Libri V-VI), era dotata di un sistema portuale nel quale i diversi punti di approdo svolgevano funzioni differenti: commerciale, militare e civile. Come noto l’ubicazione degli approdi del sistema portuale del PortusLunae non è mai stata identificata con sicurezza, anche se recentemente sono stati fatti alcuni progressi in tal senso basati sia su attendibili ricostruzioni paleogeografiche che su nuove evidenze archeologiche. Per quanto riguarda l’approdo commerciale, era stata avanzata l’ipotesi che in Età Romana un bacino di incerta natura, ubicato ai piedi della conoide pedemontana del Carrione, avesse potuto ospitare il porto attraverso il quale i marmi apuani venivano massicciamente commercializzati. Ad oggi l’esistenza e l’ubicazione di un “porto orientale” manca di conferme archeologiche, sebbene la presenza del toponimo di “Marmorata” a nord dell’anfiteatro, rappresenti un indizio della presenza di un sito di stoccaggio dei marmi prossimi all’imbarco. Un assetto paleogeografico compatibile con l’ipotesi di un approdo commerciale ad ovest delle mura urbane di Luni necessitava di essere verificata attraverso una ricostruzione paleoambientale. Pertanto è stata recentemente condotta un’indagine puntuale sul cordone litorale più prospiciente alla linea di costa attuale (Fig.1), al fine di valutarne l’evoluzione diacronica come forma emersa, e quindi insediabile.Tale cordone, infatti, si presenta geometricamente connesso con quello “della Marinella”, dal quale è fisicamente separato dal tratto terminale del corso del T. Parmignola. Il cordone della Marinella è tradizionalmente considerato un’ “isola” già esistente in Età Romana. I dati di sottosuolo, solo parzialmente editi, testimoniano che la facies sedimentaria litorale, osservabile in superficie, permane sino ad una profondità di almeno 8 m dal piano di campagna. Questo fatto, pur in assenza di vincoli cronologici, implica una persistenza di questa unità morfologica nel tempo. Le ricerche di Fabiani suggeriscono che il cordone geometricamente connesso a SE con quello della Marinella, attualmente identificabile lungo il litorale toscano a S del T. Parmignola, si sarebbe formato a partire dal XVIII secolo. Lo studio combinato dell’assetto morfologico attuale dell’area, dei dati di sottosuolo disponibili e reperiti ad hoc e delle evidenze storico archeologiche, ha fornito elementi chiaramente interpretabili e fra di loro concordanti, che consentono di tratteggiare l’evoluzione paleogeografica dell’area in epoca storica e di suggerire la possibilità dell’esistenza, in epoca romana, di un approdo presso la foce del Carrione
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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