1,721,014 research outputs found
The lichen vegetation on the Cathedral of Orvieto (Central Italy)
Full text linkThe lichen vegetation of the Cathedral of Orvieto (Centrai ltaly) has been studied on the basis of 29 phytosociological releves carried out on different parts of the church, and on different substrates. The species by releves matrix has been submitted to classification and ordination to detect different community-types and to study possible ecological gradients. The ecology of the community-types has been studied by means of the ecological indices derived from Wirth (1980). The main causes of lichen growth in different parts of the church, the main aesthetic damages, and the possible measures for eliminating and preventing lichen growth are discussed.LA VEGETAZIONE LICHENlCA DEL DUOMO DI ORVIETO. La vegetazione lichenica
del duomo di Orvieto è stata studiata sulla base di 29 rilievi fitosociologici effettuati in diverse parti della chiesa, e su diversi substrati. La matrice delle specie e dei rilievi è stata sottoposta a classificazione ed ordinamento al fine di individuare diversi tipi di vegetazione e di evidenziare possibili gradienti ecologici. L'ecologia dei diversi tipi di vegetazione è stata studiata utilizzando le diagnosi ecologiche proposte da Wirth (1980) per le singole specie. Vengono discussi le principali cause che determinano la crescita dei licheni nelle diversi parti del Duomo, i principali danni estetici da essi creati, e possibili misure di intervento per eliminare e prevenire la crescita dei licheni nella parti maggiormente
colpite
Chamaecytiso-Genistetum michelii, a new thorny-cushions association in the Gargano peninsula (SE Italy).
No full textUna nuova associazione dominata da arbusti spinosi emisferici viene descritta per la Penisola del Gargano. Struttura .ed ecologia dell'associazione vengono discusse sulla base di metodi numerici d'analisi multivariata . L'associazione é dominata da Chamercytisus spinescens, Genista michelii, Rosmarinus officinatis and Euphorbia spinosa ; per essa viene proposto il nome di Chamaecytiso-Genistetum michelii. Nella caratterizzazione ecologica dell' associazione, l'azione del vento giuca un ruolo predominante. L'effetto del vento sull'organizzazione spaziale delle varie specie di arbusti spinosi é stato studiato trmite l'analisi di un transetto. Il Chamaecytiso-Genistetum é la più orientale tra le associazioni ad arbusti spinosi a cuscinetto dominate da specie del genere Genista nell'Italia mediterranea.A new thorny-cushions stand is described from the Gargano Peninsula (South Eastern Italy). On the basis of numerical methods of classification and ordination the structure and ecology of the thorny-cushions vegetation and its contact communities are discussed. The thorny-cushions stand is dominated
by Chamercytisus spinescens, Genista michelii, Rosmarinus officinatis and Euphorbia spinosa. The name Chamaecytiso-Genistetum michelii is proposed for the new thorny-cushions association. In the ecological characterization of the association, wind action plays a major role. The effect of wind in the spatial patterning of the thorny-cushion plants has been studied by means of transect analysis. The Chamaecytiso-Genistetum michelii is the easternmost thorny-cushion association dominated by Genista species in Mediterranean Italy .De Faveri R., Nimis P.L. Chamaecytiso-Genistetum michelii, a new thorny-cushions association in the Gargano peninsula (SE Italy). In: Ecologia mediterranea, tome 8 n°3, 1982. pp. 85-98
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
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
A Pan-European Species-directories Infrastructure (PESI)
Full text linkThis paper introduces the rationale and aims of the Europewidebiodiversity informatics PESI [1] project. PESI defines and coordinatesstrategies to enhance the quality and reliability of European biodiversityinformation by integrating the infrastructural components of four majorcommunity networks on taxonomic indexing, namely those of marine life,terrestrial plants, fungi and animals, into a joint work programme. This willinclude functional knowledge networks of both taxonomic experts and regionalfocal points, which will collaborate on the establishment of standardisedand authoritative taxonomic (meta-) data. In addition PESI will coordinatethe integration and synchronisation of the European taxonomic informationsystems into a joint e-infrastructure and the creation of a common userinterfacedisseminating the pan-European checklists and associated userservicesresults
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