1,720,956 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Estudio teórico de la coordinación de moléculas de hidrógeno a compuestos organometálicos de metales alcalinos (M = Li, Na, K) con ligantes etileno y alilo
Get PDFLas interacciones de hidrógeno molecular con pequeños complejos organometálicos ha llamado la atención de investigadores debido a su importancia como una forma de almacenar hidrógeno y crear celdas de combustible. Sin embargo antes de poder usarlos en celdas de combustibles, es necesario resolver las dificultades en cuanto a su almacenamiento, transportación y liberación. Desde este punto de vista, varios complejos organometálicos que contienen metales alcalinos y de transición se han considerado como posibles candidatos para almacenar hidrógeno. Las investigaciones realizadas en su mayoría son llevadas a cabo teóricamente. Tavhare y colaboradores, demostró que la adsorción de hidrógeno es energéticamente desfavorable en complejos acetileno coordinados a metales alcalinos, sin embargo, es favorable en complejos acetileno-Ti [1]. Los resultados obtenidos teóricamente y experimentalmente están de acuerdo, en relación a la capacidad de almacenar H2 del complejo etileno-Ti [2]. Por otro lado, Zhou y colaboradores, predijeron la capacidad de almacenamiento del complejo etileno-Li2 la cual se encuentra alrededor de un 16 % en peso [3]. Kalamse y colaboradores encontraron que los complejos etileno-Ti son más propicios para considéralos como posibles almacenadores de H2 que los complejos etileno-Li [4]
Estudio teórico de la reactividad de gases nobles hacia el dímero Ni2O2
No full textEn este trabajo se presentan los resultados teóricos obtenidos de la investigación realizada sobre la
coordinación de gases nobles, X (X=He-Rn) con el dímero Ni2O2, utilizando las teorías DFT (PBE0) y de
perturbación de Møller-Plesset de segundo orden (MP2), en combinación con el conjunto de bases def2-
TZVP. Los resultados encontrados sugieren que todos los gases nobles estudiados forman coordinaciones
débiles con el dímero de Ni2O2. Estas coordinaciones fueron caracterizadas analizando los índices de Wiberg
y los orbitales moleculares. Además estudios de NBO corroboraron la presencia de enlaces de coordinación
entre los átomos X-Ni, los cuales fueron caracterizados analizando los orbitales naturales y su energía de
estabilización E(2). El número máximo de átomos de gas noble que se puede coordinar por cada átomo de
níquel es de dos. Por otro lado, al coordinarse los gases nobles a los átomos de níquel generan interacciones
débiles entre ambos átomos de níquel presentes en cada estructura. Esta interacción está ausente en la
estructura del dímero Ni2O2.
Adicionalmente, se calcularon las energías de disociación de enlace (EDEs) entre los átomos de níquel y
gas noble. La energía requerida para remover uno de los cuatro átomos X es menor comparada cuando el
dímero N2O2 tiene solo un átomo de gas noble coordinado
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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