1,720,955 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
Development of glucose oxidase-based bioanodes for enzyme fuel cell applications
Full text linkWe fabricated an enzyme fuel cell (EFC)\ud
device based on glucose as fuel and glucose oxidase (GOx)\ud
as biocatalyst. As a strategy to improve GOx stability,\ud
preserving at the same time the enzyme catalytic activity,\ud
we propose an immobilization procedure to entrap GOx in\ud
a polymer matrix based on Nafion and multiwalled carbon\ud
nanotubes. Circular dichroism (CD) spectra were recorded\ud
to study changes in the 3D structure of GOx that might be\ud
generated by the immobilization procedure. The comparison\ud
between the CD features of GOx immobilized and free\ud
in solution indicates that the shape of the spectra and\ud
position of peaks do not significantly change. The bioelectrocatalytic\ud
activity toward glucose oxidation of\ud
immobilized GOx was studied by cyclic voltammetry and\ud
chronoamperometry experiments. Such electrochemical\ud
experiments allow monitoring the rate of GOx-catalyzed\ud
glucose oxidation and extrapolating GOx kinetic parameters.\ud
Results demonstrate that immobilized GOx has high\ud
catalytic efficiency, due the maintaining of regular and\ud
well-ordered structure of the immobilized enzyme, as\ud
indicated by spectroscopic findings. Once investigated the\ud
electrode structure–property relationship, an EFC device\ud
was assembled using the GOx-based bioanode, and sulfonated\ud
poly ether ether ketone as electrolyte membrane.\ud
Polarization and power density curves of the complete EFC\ud
device were acquired, demonstrating the suitability of the\ud
immobilization strategy and materials to be used in EFCsThe financial support of the Italian Ministry for Environment (MATTM, Project MECH2), the Ager Consortium and Fapesp/CNPq (Brazilian Funding Agencies) is gratefully acknowledged
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
A Glucose Biofuel Cell to Generate Electricity
No full textWe fabricated an enzymatic fuel cell (EFC) device based on
glucose as fuel, the bioanode consisting in a commercial carbon
cloth electrode containing the glucose oxidase (GOx) enzyme. The
bioanode was prepared by immobilizing GOx in a Nafion matrix.
The outcome of the immobilization procedure was tested by
Fourier transform infrared spectroscopy, scanning electron
microscopy (SEM), and cyclic voltammetry (CV) which indicated
a good catalytic activity and stability of the immobilized enzyme
toward the reaction of glucose oxidation. The bioanode was the
assembled in a glucose fuel cell, using a ferricyanide cathode and a
Nafion 117 membrane as electrolyte. Polarization and power
density curves were then acquired to evaluate the electrochemical
performance of the EFC device demonstrating the applicability of
the GOx-modified electrode as promising bioanode for energy
production
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
