1,721,004 research outputs found
TECNICHE DI RILIEVO LASER SCANNER A SUPPORTO DEL PROGETTO DI RESTAURO CONSERVATIVO DEI BENI CULTURALI. L’ESEMPIO DEL CASTELLO DI SIVILLER E DEL CAMPANILE DI MORES
No full textNella Geomatica il rilievo dei Beni Culturali si presta ad un approccio complementare ed integrato di tecniche e tecnologie differenti. Ogni bene culturale, infatti, costituisce un caso a sé stante, con le proprie caratteristiche, problematiche e specificità, che spesso costringono ad abbandonare i classici schemi ed approcci del rilievo topografico per cercare soluzioni nuove e diversificate.
Le maggiori attese di questi ultimi anni, nel settore dei Beni Culturali, sono indirizzate alle tecniche laser a scansione tridimensionale; un sistema in grado di operare, in modo veloce e con accuratezze elevatissime, la ricostruzione della geometria dell’oggetto rilevato. Attraverso un rilievo laser scanner è quindi possibile ricostruire beni che presentano geometrie molto complesse tali da permettere lo studio approfondito delle tecniche costruttive, consentendo la percezione e l’analisi di particolari geometrici difficilmente rilevabili con le tecniche di rilievo tradizionali.
Nell’articolo vengono presentati due casi studio che riguardano beni di importanza storico-architettonico in Sardegna: il Castello di Siviller del XV sec., ubicato nel comune di Villasor, e la Torre campanaria di Mores, che con la sua altezza di quasi 40 metri è il campanile più alto della Sardegna. Le problematiche legate a questi due beni son differenti, il primo è una fabbrica che presenta le strutture verticali completamente deformate e fuori piombo. La seconda ha uno sviluppo prevalentemente verticale e seppur in condizioni statiche buone, è sormontato da una statua che versa in condizioni di degrado elevato. Per entrambi i beni sono allo studio progetti di restauro conservativo per i quali è stato richiesto un rilievo con elevate accuratezze e lo studio delle deformazioni e del degrado a cui sono soggette. Per questi rilievi è stato scelto di utilizzare il laser scanner e di studiarne le potenzialità, non solo per la predisposizione degli elaborati grafici ma, grazie alla grande quantità di dati che un rilievo laser scanner fornisce, verificare la possibilità di eseguire analisi e studi per definire il degrado, la geometria e le caratteristiche architettoniche che contraddistinguono il bene in modo veloce e accurato
Effects of drought on leaf area development, biomass production and nitrogen uptake of durum wheat grown in a mediterranean environment
No full textEFFECT OF DROUGHT ON YIELD AND YIELD COMPONENTS OF DURUM WHEAT AND TRITICALE IN A MEDITERRANEAN ENVIRONMENT
No full textRelationships between grain-filling parameters, fertility, earliness and grain protein of durum wheat in a Mediterranean environment
No full text
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
- …
