1,721,055 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
Control de evolución de antocianos, aplicando la técnica de Ribereau-Gayón en aceitunas negras procesadas, por oxidación de burbujeo y difusión de aire
No full textLa producción de aceitunas de mesa, junto con el aceite de oliva, se encuentra en franco aumento, gracias al auge dado en el consumo a estos alimentos. El color es un atributo fundamental en el momento de apreciar su calidad, ya que es lo primero que percibe el consumidor, siendo esta valoración en gran medida subjetiva. Los antocianos, son los pigmentos encargados de dar colores que van desde el rosado al violeta, característico en aceitunas negras pero a diferencia de otros pigmentos, éstos no son estables, especialmente en soluciones alcalinas, manifestándose en la pérdida del color. Se trabajó con la variedad Nevadillo, en tres momentos de cosecha: verdes, pre- envero y envero avanzado. Se aplicaron dos tratamientos de oxidación durante cuatro días: uno por incorporación de aire por burbujeo fino y otro por incorporación de aire por recirculación y solubilización por Venturi. Se aplicó la técnica Ribereau–Gayon para la cuantificación de antocianos y se expresaron en miligramos por litro, en pulpa y líquido de gobierno, utilizando espectrofotometría ultravioleta visible. Se analizó estadísticamente como un experimento factorial con diseño completamente aleatorizado y los datos de la cuantificación de antocianos indicó una diferencia significativa (α=0,005) de orden superior. Con lo cual la cantidad de antocianos depende del momento de cosecha del fruto, la muestra a la que se aplica el método de análisis (pulpa o líquido de cobertura), los tratamientos de oxidación aplicados y los días que se sometieron las aceitunas a esos tratamientosFil: Rodriguez, Olga Sandra. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias
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
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
Modelling of the gas dynamics in the inner-coma and the composition of comet 67P/Churyumov-Gerasimenko
No full textThis thesis presents a study of the gas dynamics of cometary nuclei with a focus on the target
of the Rosetta mission, comet 67P/Churyumov-Gerasimenko. We therefore apply the 3D Direct
Simulation Monte Carlo (DSMC) method to different distributions of H2O and CO2-ice source on
the surface of the nucleus in order to model the inner-coma of 67P/CG. The sublimation rates and
temperatures at the surface are calculated using a balance equation that takes into account the
solar radiation at the surface and the energy losses due to thermal emission, sublimation of ices
and thermal conduction. This has been done for a spherical nucleus comet of 2km, and a comet
that takes into account the real shape of 67P/CG.
The ultimate goal of this work is to find a link between remote sensing observations at
large distances and the relative abundances of major volatiles in the nucleus. Therefore, for the
complex shape of the nucleus, we validate our surface boundary condition by comparing the
simulation results with local measurements of the gas properties obtained by ROSINA, MIRO
and VIRTIS-M.
The targeted times in this work are May 10, 2015, when the comet was at its spring equinox
at 1.67AU; and July 10, 2015, when the comet was at 1.67AU and the global production rates
were high enough to study the increasingly emissions from the southern hemisphere of the comet
as it approached perihelion.
We have found that different distribution of H2O and CO2 sources at the surface are difficult
to detect using ROSINA data alone. Comparison with multiple instruments are found to be
necessary to better constrain the thermophysical models that link comae measurements with
the nucleus near-surface structure and composition. CO2 has been found to be the most likely
candidate for nightside activity in multiple tests that include thermal inertia values between 40 -
80 J/(m2K
p
s ). There is a strong indication that the heat exchange between the dust mantle and
the sublimating gas can have a strong effect on the expansion velocities of the gas measured by
MIRO on both dates
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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