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
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
Nonlinear optics Pulse propagation in fiber optics filled with gases, liquids, and organic dyes.
Full text linkThe characterization of nonlinear optical material properties, such as nonlinear refractive index and nonlinear absorption coefficient, is one of the most important subjects in nonlinear optics due to its application in many fields such as spectroscopy, material processing, biophysics, atmospheric sensing and metrology, among others. Besides the possibility of creating new technology. In this thesis, the Z-scan technique was implemented and calibrated. It remains one of the most widely used techniques to obtain both nonlinear refractive index and the absorption coefficient of a material. Moreover, nonlinear phenomena inside optical fiber is well known due to their applications and advantages like the low input energy required to generate supercontinuum, four wave mixing, dispersive wave, among others. In this work, several simulations were performed with new fiber geometries, material responses and different noble gases infiltrated in fiber. Different simulation regimes were considered as well by varying input power, pulse width and pressure. Nonlinear parameters for organic dyes, multi-walled carbon nanotubes, and CS2 were reported, pointing out the main reasons behind each result and addressing possible new phenomena involved. The nonlinear output response in both time and frequency domains was reported for several simulations, obtaining the nonlinear pulse output for the new CS2 response function. A novel consideration was proposed in which the final pulse depends on the propagation distance for non-instantaneous materials and the nonlinear constant (γ) must be recalculated at each step. It was demonstrated how the output pulse can be controlled by changing the fiber length. Among the most important results, it was found there exists a possibility to change between modulation instability and four wave mixing by only varying the propagation distance. Finally, it was also found that a special type of fiber, namely negative curvature hollow core fiber, can be used to obtain a broad band spectrum when it is filled with noble gases and they can be tuned with pressure from linear behavior up to a super critical zone.Resumen: a caracterización de propiedades ´ópticas no lineales, como lo son el ´índice de refracción y el coeficiente de absorción no lineal, es uno de los temas más importantes en ´óptica no lineal debido a su aplicación en muchos campos como la espectroscopia, procesamiento de materiales, biofísica, sensado atmosférico, metrología, entre otros. Además de la posibilidad de creación de nueva tecnología. En esta tesis se implemento y calibro la técnica Z-Scan, una de las técnicas más utilizadas para obtener tanto el ´índice de refracción no lineal como el coeficiente de absorción de un material. Asimismo, los fenómenos no lineales dentro de la fibra ´óptica son bien conocidos debido a sus aplicaciones y ventajas tales como la baja energía de entrada requerida para generar fenómenos de supercontinuo, mezclado de cuatro ondas y ondas dispersivas. En este trabajo se realizaron varias simulaciones con nuevas geometrías de fibras, respuestas de material y gases nobles dentro de la fibra. Se consideraron diferentes regímenes de potencia de entrada, ancho de pulso y presión. Se reportaron los parámetros no lineales para las sustancias orgánicas usadas, nanotubos de carbono de paredes múltiples y CS2, indicando la razón principal detrás de cada resultado y abordando los posibles nuevos fenómenos involucrados. La respuesta de salida no lineal tanto en el dominio del tiempo como en el de frecuencia se reportó en varias simulaciones, obteniendo el pulso no lineal de salida para la nueva función de respuesta del CS2, se propuso una nueva consideración donde el pulso final depende de la distancia de propagación para materiales no instantáneos y la constante no lineal (γ) se deben recalcular en cada paso. Se demostró como se puede controlar el pulso de salida cambiando la longitud de la fibra; entre los resultados más importantes se encontró la posibilidad de cambiar entre la inestabilidad de la modulación y el mezclado de cuatro ondas solo variando la distancia de propagación. Finalmente, se encontró que un tipo especial de fibra, a saber, la fibra de núcleo hueco de curvatura negativa, se puede usar para obtener un amplio espectro de banda cuando se llena con gases nobles y se sintoniza con la presión, desde el comportamiento lineal hasta la zona supercríticaMaestrí
¿Por qué el acto del matar no cesa en su repetición? Un abordaje del asesinato como sostén de la cultura
Full text linkEl presente trabajo se inscribe en lo que concierne a la tendencia del humano hacia la repetición de un acto que se muestra como atroz, pero al tiempo imposible de eludir o eliminar en toda organización social: el asesinato. Acto que logramos reconocer desde los inicios siempre míticos de la cultura. De esta forma, y de la mano de las elaboraciones psicoanalíticas inauguradas por Freud y repensadas por Lacan, se trabaja en torno al asesinato con la intención de darle algo de sentido y, tal vez, poder ubicar su lugar en el drama humano.Abstract. The present work is about the tendency of the human been to repeat an outrageous, but impossible to eliminate act, in all social organization: the murder. With the psychoanalytic work, inaugurated by Freud and rethought by Lacan, this thesis work around the murder with the intention to give it some sense and, perhaps, to be able to locate its place in the human drama.Maestrí
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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