1,720,975 research outputs found
G. Balbi, L 'épistolar io di Jacopo Bracelli
No full textBraunstein Philippe. G. Balbi, L 'épistolar io di Jacopo Bracelli. In: Annales. Économies, Sociétés, Civilisations. 27ᵉ année, N. 1, 1972. pp. 261-262
Magnetic resonance and ultrasound contrast imaging of polymer-shelled microbubbles loaded with iron oxide nanoparticles
No full textDual-mode contrast agents (CAs) have great potential forimproving diagnostics. However, the effectiveness of CAs isstrictly related to both the solution adopted to merge the twoagents into a single probe unit, and the ratio between the twoagents. In this study, two dual-mode CAs for simultaneousmagnetic resonance imaging (MRI) and ultrasound imaging(UI) were assessed. For this purpose, different densitiesof superparamagnetic iron oxide nanoparticles (SPIONs)were anchored to the external surface of polymer-shelledmicrobubbles (MBs) or were physically entrapped into theshell.In vitrostatic and dynamic experiments were carriedout with a limited concentration of modified MBs (106bubblesml−1) by avoiding destruction during UI (performed at apeak pressure lower than 320 kPa) and by using a low-field MRI system (with a magnetic flux density equal to0.25 T). Under these conditions, different imaging techniques,set-up parameters and SPION densities were used to achievesatisfactory detection of the CAs by using both UI and MRI.However, when the SPION density was increased, the MRIcontrast improved, whereas the UI contrast worsened dueto the reduced elasticity of the MB shell. For both UI andMRI, MBs with externally anchored SPIONs provided betterperformance than MBs with SPIONs entrapped into the shell.In particular, a SPION density of 29% with respect to the massof the MBs was successfully tested.
Magnetic resonance and ultrasound contrast imaging of polymer-shelled microbubbles loaded with iron oxide nanoparticles
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
[Reversibility in vitro and in vivo of carbonic anhydrase inhibition with dichlorphenamide]
No full textDispelling 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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