1,721,001 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
Souvenir de Paris
No full textIl contributo ripercorre le vicende degli italiani a Parigi durante il periodo coincidente con l'Impressionismo in pittura e scultura, ponendo l'accento sulle vicende di Giuseppe De Nittis e di altri maestri quali Boldini, Zandomeneghi, Degas
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
Analisi comparativa delle abitudini alimentari del lupo (Canis lupus) in tre diversi ecosistemi italiani
No full textStudy of thermal behavior and molecular composition of mixtures of resinous materials and beeswax found as adhesives in archaeological finds
Full text linkBeeswax and resinous materials have been used and combined since ancient times to obtain adhesives. In this work, we studied mixtures of these two materials under heating to investigate the effect of their interactions on the properties of the resulting adhesive. The results were then compared with those of archaeological samples, to obtain new insights into ancient technological knowledge. This study was performed by combining two different chemical-analytical techniques: evolved gas analysis coupled with mass spectrometry and flow injection analysis -high resolution mass spectrometry. Evolved gas analysis was used to investigate the thermal behavior of the mixtures and obtain information on production techniques and ageing processes. The data were processed by isoconversional method to estimate the activation energies associated with the thermal degradation of the ad-hesives. The results suggested that archaeological mixtures were subjected to a thermal pre-treatment before their use as adhesives and that heating led to a material with new chemical features, due to the formation of hybrid species between resin diterpenes and the beeswax compounds. The formation of these species was confirmed by high resolution mass spectrometry
Composite gems in medieval era: the art of counterfeiting before the sixteenth century
No full textThis study explores the evolution of gemstone treatments, with a particular focus on composite gems, which consist of two or three layers of natural gems or artificial materials glued together with adhesives and pigments to imitate genuine natural gems (e.g. doublets and triplets). While traditional treatments such as foiling and coating are well documented, composite gems are largely absent from ancient literature. Pliny is the earliest source to mention the practice of gem imitation, even though with some condemnation. After a considerable gap, the first description of doublets and triplets appear in Leonardi (1502) and Cellini (1568), with the first literature reference to composite gems on goldwork dated to the fourth decade of the fifteenth century. The analysis of a collection of goldsmithing artifacts, dating from the late thirtheenth to the fifteenth centuries and preserved in Tuscany museums, revealed—for the first time—the unexpected presence of composite gems alongside a variety of gemstones and treatment methods. Gemological analysis, including Raman spectroscopy, and the study of adhesives using pyrolysis gas chromatography coupled with mass spectrometry, have shed light on their manufacturing processes. The results suggest that composite gemstones, particularly doublets and triplets, have been systematically produced in specialized workshops since the thirteenth century. This production is likely to have coincided with advances in the technology of cutting precious stones and artificial glass. This research not only sheds light on historical gemstone craftsmanship but also opens new perspectives for studying the evolution of gemology, challenging previous assumptions about the timeline and context of composite gemstone production
A comparative analysis of wolf (Canis lupus) diet in three different Italian ecosystems
No full textTo verify food habit flexibility of wolf populations under different ecological conditions, scats were analysed collected year round in three study areas and diet composition of resident packs was compared. The three study areas, representing Alpine (SV), Apennine (PM) and Mediterranean (CV) ecosystems, are rich in wild ungulates, which differ in number of species and relative abundance; livestock is also present. Wild ungulates were the main source of food, accounting for 89.4%-95.1% of the diet. Livestock, instead, hardly reached 8% of annual mean percent volume in any one area, and only in the Alps did they play a major role in autumn. Other food items constituted less than 5% of annual mean percent volume. Variations in the proportions of use of wild ungulate categories were observed among the study areas, although some patterns of intraspecific selection emerged in each area. Finally, differences both in the relationships between utilisation and availability of preys, and in trophic niche breadth were discussed in relation to environmental features and colonization patterns
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
- …
