1,720,961 research outputs found
The diagnostic study of the plaster replicas of the Trajan's Column conserved at the Museum of Roman Civilisation (Rome)
Get PDFThe management of indoor microclimate in museums has recently received growing attention. Museum climatology and the mechanism for the degradation process, defined as a result of progressive and cumulative decay, depends on environmental variables and their changes. In fact, temperature and relative humidity gradients are often the main causes of chemical and physical decay of artefacts. This research focuses on assessing the state of conservation of 34 gypsum-based plaster replicas of Trajan’s Column at the Museum of Roman Civilisation and on the microclimate monitoring of Room LI, where they are conserved. The decay assessment of the studied plaster casts was performed using a multidisciplinary analytical approach to characterize the constituent materials and to identify the main degradation patterns by i) on-site investigation with non-destructive methodologies; ii) chemical and petrographical characterization on collected micro samples. Microclimate variables (temperature, relative humidity and dew point) were measured along seven months to define the actual environmental conditions and the response of the materials to the microclimate
Early changes in renal hemodynamics in children with diabetes: Doppler sonographic findings
No full textThe diagnostic study of the plaster casts of the Trajan’s Column in the Museum of Roman Civilisation (Rome)
No full textIn recent years, the control of the microclimate in museums has been increasingly recognised as important. This research focuses on state of conservation assessment of 34 plaster casts of Trajan’s Column at the Museum of Roman Civilisation and on the microclimate monitoring of the Room LI, where they are conserved. The results continue to demonstrate that the main causes of decay derive from unsuitable climate conditions, which lead to cracks and detachments
US in the diagnosis of gastroesophageal reflux in children
No full textSeveral techniques have been used to diagnose gastroesophageal reflux (GER) in children, but no single test is sufficiently accurate to completely investigate the problem. Gastroesophageal US has been described as a widely available, noninvasive and sensitive method. It provides morphological and functional information, but its role in the diagnosis of GER in children is still debated. In this paper we review diagnostic approaches to GER in children. We focus on current use of US in the management of children with suspected GER. Reports suggest that US allows exclusion of several non-GER causes of symptoms and that it provides morphological and functional data with high sensitivity and positive predictive value for the diagnosis of GER. Sonographic assessment of findings such as abdominal esophageal length, esophageal diameter, esophageal wall thickness and gastroesophageal angle provide important diagnostic indicators of reflux and related to the degree of GER. There is a need for standardization of the procedure and for defining diagnostic criteria
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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