1,721,001 research outputs found
Analisi d’immagine per la caratterizzazione strutturale dei materiali vetrosi
No full textDigital Image Processing (DIP) is an advanced technique,
here applied as a novel tool to investigate vitreous materials. DIP allows
the determination of the microstructural and the tcxtural parameters useful to
classify these materials. Three main classes have been identified: glass, glassy faience,
and faience/DIP is extremely useful even to characterise the textures of
faiences, in arder to understand the production techniques
I vaghi in vetro provenineti dalla necropoli di Ponte Nuovo
No full textSeveral gìass materials from the Final Bronze Age (FBA) bave been found in the necropolis of Ponte Nuovo (Gazzo Veronese, near Verona). In the present work an eyed bead and a globular one, both ftotn tombZà, have been subjected to archaeometric analyses, The two samples taken from the blue bodies of the beads and the sample taken frorn the white decoration of the eyed bead have been analysed bya scanningelectron rnicroscopy combined with energy dispersive spectroscopy (SEM -EDS); they are composed by glass containing nurnerous crystal inclusions. The crystalline phases have been identified by X-Ray diffraction (XRD) as quartz, in theglobulat bead, and tridymite, in the blue body of the eyed bead. The chemical data-cf theglass phases, obtained by electron probe micro analysis (EPMA), show that the glasses have a LMHK (Low Magnesium High Potassium) composition, typical of the European glasses. Unfortunately the white glass sample is strongly weathered, while the blue samples, both colourèd with copper, are welI preserved,
In the present work the chemical, mineralogical and textutal data of the Ponte Nuovo finds afe discussed and rhoroughly compared with the few analyses availab1e inthe literature concerning coeval European objects with
the, same typologj, and moreover with the available chemical data of FBA Italian glasses. The comparìson showsa high similarity between the glasses frorn Ponte Nuovo and the otber FBA glasses
Bottoni conici e perle in glassy faience delle fasi iniziale e piena della media Età del Bronzo dell’Italia Centrale tirrenica: archeologia ed archeometria
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Early Bronze Age Faience From the North Italy and Slovakia: a Comparative Archaeometric Study
No full textGoing 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
Protohistoric vitreous materials of Italy: From early faience to Final Bronze Age glasses
No full textVitreous materials were known in the Near.East and Egypt from the 4th millennium BC; faience became common during the 3rdll)illennium from the dynastic time(Aspinall et al. 1912, 27), whereas the mass-production of glass started in the 2nd millennium BC (Henderson 2000, 52). Investigations of Near Eastern samples have shown the presence of'high magnesium glasses (IDv[G) frem the 19th century Bç at 'Ain 'Abata (Jordan) and Tel Dan (Israel); simìlar glass composition were found in materìals from more recent sites, lik:eNuzi (Iraq), Ulu Burun (Turkey), Tell Al-Rimah (Iraq), as summarized by Henderson (Henderson 2000, 54-9). The early Egyptian glasses are of the HMG type and during the 15-1 4th centuries B'C the Egyptian production includes copper blue and cebalt blue frits, glasses and faience (Tite and Shortland 2Q03). The earliest materials indicating the use ofNa-rieh rninerals as the alkali source in low magnesium glasses (LMG) glass production are 13-12th centuries BC glasses from Pella (Jordan). Other early LMG glassés are from Tell Brak (Syria) and Crete. The pieture of Bronze Age vitreous material production in the Aegean area is therefore rather complex. A separate class of glasses having mixed alkali chemical composition (LMHK, Iow magnesium high potassium) has been defined formost Europeanmaterials dated to the late 2nç millennìum BC (Henderson2000-, 54-9). The ltalian samples studied in the present work were selected according to theirtypologyand age, for appropriate comparison with coeval samples from the Eastern Mediterranean area
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
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