1,720,990 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
Inkjet printing methodologies for drug screening
No full textWe show for the first time a contactless, low-cost, and
rapid drug screening methodology by employing inkjet
printing for molecular dispensing in a microarray format.
Picoliter drops containing a model substrate (D-glucose)/
inhibitor (D-glucal) couple were accurately dispensed on
a single layer consisting of the enzymatic target (glucose
oxidase) covalently linked to a functionalized silicon oxide
support. A simple colorimetric detection method allowed
one to prove the screening capability of the microarray
with the possibility to assay with high reproducibility at
the single spot level. Measurements of the optical signal
as a function of concentration and of time verified the
occurrence at the solid-liquid interface of the competitive
enzymatic inhibition with a similar behavior occurring for
this system in a solution phase along with overcoming
competition effects. We propose this methodology as a
general application for drug screening purposes, since it
may be extended to any kind of enzyme-substrate/
inhibitor or ligand-target biochemical syste
Engineering 3D ordered molecular thin films by a nanoscale control
No full textThis perspective aims to report on experimental preparation and investigation tools for
engineering molecular thin films with a three-dimensional (3D) nanoscale control that is of
relevant interest for different emerging applications as well as for the development of calibration
standards. Such thin films may be obtained by man-made methods, self-assembly or
spatio-temporal self-organization and/or by the combination of these last approaches with
external tools. Understanding the main features and the physical-chemistry underlying the related
ordering phenomena is in due course and a theoretical framework is under development. In this
respect it is of fundamental importance to achieve the ability to get 3D structural images with a
nanoscale detail. This issue is at the early stage and novel techniques like electron tomography
and scanning transmission X-ray microscopy are very promising
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