1,721,028 research outputs found
Libro IV artt. 1678-1702
No full textCommento alla disciplina del codice civile sul contratto di trasport
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
Disassembly of shank and homer synaptic clusters is driven by soluble beta-amyloid(1-40) through divergent NMDAR-dependent signalling pathways
No full textDisruption of the postsynaptic density (PSD), a network of scaffold proteins located in dendritic spines, is thought to be
responsible for synaptic dysfunction and loss in early-stage Alzheimer’s disease (AD). Extending our previous demonstration
that derangement of the PSD by soluble amyloid-b (Ab) involves proteasomal degradation of PSD-95, a protein important
for ionotropic glutamate receptor trafficking, we now show that Ab also disrupts two other scaffold proteins, Homer1b and
Shank1, that couple PSD-95 with ionotropic and metabotropic glutamate receptors. Treatment of fronto-cortical neurons
with soluble Ab results in rapid (within 1 h) and significant thinning of the PSD, decreased synaptic levels of Homer1b and
Shank1, and reduced synaptic mGluR1 levels. We show that de novo protein synthesis is required for the declustering effects
of Ab on Homer1b (but not Shank1) and that, in contrast to PSD-95, Ab-induced Homer1b and Shank1 cluster disassembly
does not depend on proteasome activity. The regulation of Homer1b and Shank1 by Ab diverges in two other respects: i)
whereas the activity of both NMDAR and VDCC is required for Ab-induced declustering of Homer1b, Ab-induced
declustering of Shank1 only requires NMDAR activity; and ii) whereas the effects of Ab on Homer1b involve engagement of
the PI-3K pathway and calcineurin phosphatase (PP2B) activity, those on Shank1 involve activation of the ERK pathway. In
summary, soluble Ab recruits discrete signalling pathways to rapidly reduce the synaptic localization of major components
of the PSD and to regulate the availability of mGluR1 in the synapse
Experimental investigation of the effect of brick pattern on the structural response of masonry arches and barrel vaults
Full text linkIn this study, an experimental campaign is carried out on 1:5 in-scale models of arches and barrel vaults built with different brick patterns (radial and vertical), to investigate their structural behaviour under settlement of the supports. Models are built with cement blocks and lime mortar joints. The arch models are tested under opening settlement of one support, whereas vaults are tested under shear settlement of one abutment. The three-dimensional deformations of the structures are acquired by image and video recording, 3D-Digital Image Correlation (DIC), close-range photogrammetry and structured light scanner. The influence of the brick pattern is investigated through comparison of crack patterns, ultimate displacements and failure mechanisms
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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