1,720,975 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
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
Vegetation mapping and phytosogiological analysis of Cilento National Park riparian vegetation - Cartografia della vegetazione e analisi fitosociologica della vegetazione ripariale del Parco Nazionale del Cilento
No full text47° Congresso S.I.S.V. - 12-14 / 09 / 2012 - Facoltà di Agraria, Borgo XX giugno, 74 -Perugia, Italy
"Opportunità e sfide per la Scienza della Vegetazione in un mondo che cambia"
"Opportunities and Challenges for Vegetation Science in a Changing World.
Vegetation mapping and phytosogiological analysis of Cilento National Park riparian
vegetation.
Riparian and freshwater ecosystems are strongly endangered throughout Europe as they suffer for the ongoing
human pressure, habitat destruction, pollution and eutrophication. Monitoring species and habitats is essential to
address conservation efforts and to evaluate the results of restoration actions. Furthermore, habitat and
vegetation mapping are relevant both for scientific purposes and conservation issues. In this context we present
the main results of a two-year (2010-2011) research project founded by the Cilento e Vallo di Diano National Park
focusing on: riparian habitat and vegetation mapping; phytosociological analysis and characterization of riparian
and aquatic vegetation; land quality assessment. Vegetation Mapping were performed within a 300 m width buffer
along the main water bodies of the National Park. The Park's contiguous areas were also considered in this study.
Main water bodies surveyed and mapped were Calore, Alento, Lambro, Mingardo and Bussento River.
Photointepretation was based on 2005 digital aeroimages and GIS assistes; field surveyes were stratified on water
bodies, environmental unit and vegetation physognomy and recorded using GPS with 2-5 m precision. We
collected 273 releves and detected 748 taxa of vascular plants (approx.1/3 of the regional flora) with several new
findings for Cilento and Campania region; a not negligible amount of these are alien species showing an invasive
behaviour in riparian habitats. We mapped at 1:5.000 scale 10 water bodies amounting to 13.835 ha; map legend
has a hierchical framework and is composed by 70 items; main riparian forest types were identified as belonging to
Roso sempervirenti-Populetum nigrae-Populetum albae, Hyperico hircini-Alnetum glutinosae, Rubo ulmifoliiSalicetum albae; 27 habitats sensu Natura2000 were identified accounting to 45% of the mapped area; the most
widespread ryparian habitats are represented by 92A0, 9160, 3250, 3270 types. The project results could
contribute to assess the reference conditions of Southern Italian Peninsula water bodies, a needed data to answer
to the European Water Framework Directive (WFD 2000/60 CE). Furthermore they represent a first step of
monitoring actions of species and plant riparian communities of the National Park that are an essential activity to
address conservation efforts and to evaluate the results of management and restoration policies as explicitly
requested by art. 11 of Habitats Directive
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
Studio delle fitocenosi sul materiale di riporto nei pressi dell'imbocco del traforo del Gran Sasso (Assergi-Abruzzo). Approccio metodologico ed analisi floristica.
No full textNell'ambito di un ampio progetto di monitoraggio biologico del Gran Sasso (Abruzzo), si è avviato lo studio della successione primaria in atto sul materiale di riporto situato presso l'imbocco del traforo del Gran Sasso (Assergi). Uno studio di questo genere risulta nuovo per l'ambiente montano appenninico, sia da un punto di vista conoscitivo che metodologico. Dopo un'indagine floristica preliminare, sono state impiantate 4 aree permanenti per il rilevamento periodico di dati floristici e vegetazionali. Dai risultati finora ottenuti è emerso per questi siti l'importante ruolo colonizzatore delle specie mediterranee e di alcuni elementi endemici e boreali provenienti da ambienti di alta quota. Tale fenomeno si discosta da quanto conosciuto per la Regione Mediterranea in cui il ruolo colonizzatore è svolto per lo più da elementi ad ampia distribuzione
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