1,721,051 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
Assessment of the relation between structural and morphological setting as condition for coastal slope stability
No full textThe influence of the structural and morphological setting along coastal slopes is a well-known topic. In particular, the relationship between slope and bedding attitude as well as fracture spatial distribution play an essential role in the evaluation of the slope morphodynamic evolution within large areas. The proximity of the sea, the high slope inclinations and situationally the occurrence of landslides are some of the difficulties encountered in studying coastal slope, making it necessary to support the traditional field surveys with remote sensing and geomorphometric techniques. The use of spatial analysis and in particular the assessment of morphometric variables, could be a valid approach to investigate coastal slope involved by gravitational processes (Piacentini et al., 2021) and could be integrated with geometric and spatial analysis of joints. This work presents a multi-disciplinary approach to determine the predisposing role of the bedding and rock mass discontinuities in controlling the morphoevolution of rocky coasts.
Previously proposed methods, (Grelle et al., 2011; Santangelo et al., 2015; Francioni et al., 2018), make it possible to carry out a semi-quantitative analysis to identify structural control domains in areas with uniform lithologies. We propose to integrate these approaches with the acquisition, by means of geo-structural, geomorphological and UAV (Unmanned Aerial Vehicle) surveys, of geometric and spatial discontinuity data, integrating values of geomechanical parameters gathered on different lithologies (Uniaxial Compressive Strenght, Schmidt Hammer, Leeb hardness) and performing a kinematic analysis of the slopes.
The proposed approach has been tested on the western coastal sector of the Central Adriatic Sea (Italy) consisting of several lithologies from Cretaceous limestones and marls to the Upper Messinian sandstones and marls and interested by several gravitational processes. Highly detailed surveys using a low altitude flight platform have been carried out to obtain a 3D outcrop model to be analysed in pair with a Digital Terrain Model (DTM) derived by aerial LiDAR (Light Detection and Ranging) data, with a ground resolution of 2x2 m. The 3D model allows to identify several joint families, to implement them to those measured in the field, and successively to compare these located sets with two morphometric variables (Slope and Aspect) computable by spatial analysis in Geographic Information System (GIS) software. The relative relationship between joint families and slope geometry highlights different sectors that can be considered kinematically stable or instable for planar and wedge sliding. The comparison procedure has been implemented in a Python script (ArcPy), which allows a semi-automatic application of the repeated calculation procedures required. The fine-tuned calculation procedure represents a useful tool to provide preliminary information when assessing the likely hazard of coastal instability
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
Geo-archaeological Aspects of the Modena Plain (Northern Italy)
Full text linkIn questo lavoro, realizzato nell’ambito di una convenzione con l’Amministrazione Comunale di Modena, viene tracciata la storia dell’evoluzione geomorfologica dell’area di pianura nei dintorni di Modena , dal VI millennio a.C. (Neolitico) all’Attuale, in rapporto alla ricostruzione del paesaggio antico e in relazione alla presenza umana.
Gli studi geomorfologici hanno condotto all’elaborazione di una Carta del microrilievo (carta altimetrica con equidistanza di 1 m ottenuta disegnando le curve di livello sulla base dei punti quotati delle sezioni della Carta Tecnica Regionale della Regione Emilia Romagna). un Modello Digitale delle Altezze (DEM) (derivato dalla carta precedente digitalizzando le curve di livello. Osservando il DEM, l’aspetto che risalta maggiormente è il mutamento di morfologia dei corsi dei fiumi Secchia e Panaro e dei loro affluenti : a sud di Modena scorrono incassati mentre a nord risultano pensili), una Carta dei depositi superficiali (in cui sono stati distinti i depositi prevalentemente ghiaiosi, prevalentemente sabbiosi, prevalentemente limosi e prevalentemente argillosi) e, infine, una Carta geomorfologica (in cui sono state rappresentate le forme del terreno sia naturali sia antropiche).
Per quanto riguarda gli studi archeologici è stata elaborata una carta archeologica informatizzata, che costituisce uno strumento indispensabile per la gestione dello sviluppo territoriale e per effettuare analisi del popolamento antico. In questo lavoro la cospicua base dati, raccolti con ricerche bibliografiche e d’archivio o con scavi e ricerche sul terreno, ha permesso di integrare con sufficiente dettaglio le evidenze geomorfologiche di superficie. In particolare sono state analizzate le posizioni stratigrafiche dei rinvenimenti archeologici e confrontate con i dati paleoambientali per ricostruire l’evoluzione del territorio.
Dall’analisi comparata dei dati geomorfologici e archeologici, è stato possibile, in generale, giungere ad una datazione delle forme fluviali individuate; in questa operazione è risultato di particolare interesse lo spostamento verso ovest del F. Panaro a partire dall’età del Bronzo.
Inoltre per la zona che comprende il centro storico di Modena, è stato possibile ricostruire i piani antichi a partire dall’epoca romana, controllare gli spessori delle stratigrafie archeologiche o di deposizione alluvionale e proporre un modello di evoluzione fluviale che indica un’aggradazione della pianura con il passaggio da una pianura con corsi d’acqua incassati ad una con corsi d’acqua pensili
Progress Report - January 2005 - WP7 report
No full textIn this Progress Report (January 2005) the work carried out in WP7 is delineated
An innovative method to assess oxidative stress induced by particulate matter using a plant model organism
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