1,720,992 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
Archeologia e archeometria delle miscele leganti di Aquileia romana e tardoantica (II sec. a.C. - VI sec. d.C.)
No full textThe book “Archeologia e archeometria delle miscele leganti di Aquileia romana e tardoantica (II sec. a.C. –
VI sec. d.C.)” presents the findings of an extensive research project focused on the analysis of the com-
positional characteristics and properties of mortar-based materials used in the ancient town of Aquileia,
located in Friuli Venezia Giulia, Northern Italy, from the Roman era to the early Middle Ages.
Over 370 samples were collected from structures and buildings across various sectors of the ancient city.
Sampling primarily targeted contexts in Aquileia currently under annual archaeological investigation by
the Universities of Padova, Venice Ca’ Foscari, Verona and Udine. This dataset was extended by additional
samples selected from wall plaster fragments, mostly recovered from secondary deposits during past and
recent excavations and currently stored in the National Archaeological Museum of Aquileia or in univer-
sity laboratories.
The mortar and concrete samples were characterized using a multi-analytical approach, which included
petrographic analysis using Optical Microscopy of thin sections (OM), mineralogical analysis using X-ray
Powder Diffraction (XRPD), and microchemical investigations using Scanning Electron Microscopy with
associated Energy Dispersive X-ray Spectroscopy (SEM-EDS). In specific cases, additional techniques
such as X-ray Fluorescence (XRF) and Raman Spectroscopy were employed.
Principal component analysis (PCA) and other statistical explorative techniques were used to statistically
process the quantitative data, facilitating the examination of sample distribution according to the chrono-
logical and typological constrains of structures and decorative elements.
The results showed a high level of specialization in the “recipes” of mortar and concrete, tailored to their
specific functions. Chronology also appeared to significantly influence the composition of cementitious
compounds. Certain materials exhibited sophisticated pozzolanic properties, particularly in cases requir-
ing waterproofing. Techniques for achieving hydraulicity included adding broken ceramics, in fragments
or dust, or pyroclastic rocks (pozzolanas) to lime-based mixtures. The latter were primarily sourced from
the Phlegraean Fields District (Pulvis Puteolanus), in the Gulf of Naples, and transported by ship to the
Norther Adriatic town. Additionally, the calcination of cherty and impure limestones was documented to
produce a peculiar kind of natural hydraulic lime.
From a pure mineral-chemical perspective, in addition to traditional Ca-based pozzolanic products (such
as C-S-H, C-A-H, and C-A-S-H phases), distinctive Mg-based para-pozzolanic gels (known in cement
chemistry notation as M-S-H or M-A-S-H phases) were often observed. These gels develop as a result of
the unusual reaction between silicates (chert) and dolostone aggregates in alkaline conditions.
This extensive sampling effort provided valuable insights into the relationships among the crafts involved
in the construction and decoration of ancient buildings in Aquileia. The conclusions drawn from this
research represent a significant advancement in the understanding of ancient cementitious materials,
offering new perspectives for discussing the sourcing dynamics of raw materials, the technical expertise,
the constructive know-how and economic-productive processes of the ancient world
PURPLE-DYEING IN ROMAN AQUILEIA? NEW DATA FROM RECENT EXCAVATIONS AT THE INSULA OF THE WOUNDED BEASTS
No full textIn the course of recent excavation activities in Aquileia at the site of the insula of Wounded Beasts, the reuse of abundant
broken murex shells as raw building material was documented in three different structures. Shell-bearing contexts
have been preliminarily dated between the second half of the 4th century AD and the 5th century AD. As frequently reported
in literature, this evidence is relatable to the common praxis of recycling shell by-products after purple-dye processing.
These finds could be considered the first properly documented indication of this industry in Aquileia, although vats and tools
related to dyeing have not been discovered, as far as we know. Unfortunately, our data do not provide information about the
exact location, chronology and organization of the dye-production, which remains to be ascertained
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
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