1,720,997 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
Introducción a la teoría cinética de los gases
Get PDFEl Siglo XIX consiguió poner fin a una cuestión que el ser humano llevaba arrastrando desde la antigua Grecia: ¿Es la materia continua o discreta? Los filósofos atomistas como Demócrito defendían la existencia del ´átomo: una partícula indivisible que se combinaba de formas diversas para formar la materia, mientras que otros, como Aristóteles, afirmaban que el vacío no existía, y por lo tanto, la materia debía ser un continuo. A pesar de que con el paso de los años la pregunta fue perdiendo importancia, esta generó una gran disputa en los Siglos XVIII y XIX en el marco de la Física. Fue gracias a las aportaciones de grandes mentes como Bernoulli, Clausius o Maxwell que la visión atómica de la materia se fue imponiendo. De ellos entre otros nace precisamente la teoría cinética de los gases, la cual pretende explicar el comportamiento macroscópico de los gases mediante un análisis microscópico del mismo...Universidad de Sevilla. Grado en Físic
De la teoría cinética a la hidrodinámica
No full textEl principal objetivo de este trabajo será el estudio de la mecánica estadística del no equilibrio y la deducción de ecuaciones hidrodinámicas para el sistema más simple que podemos
considerar, un gas diluido de esferas duras. Esto nos llevará a unos resultados relativamente
simples y fáciles de interpretar intuitivamente, que son además generalizables a otros tipos
de gases diluidos con potenciales de interacción algo más complejos. Con esto, pretendemos
realizar una conexión entre la teoría cinética y la hidrodinámica, buscando derivar y fundamentar la segunda a partir de la primera, en concreto a través de la llamada ecuación de
Boltzmann.Universidad de Sevilla. Grado en Físic
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
Introducción a la Mecánica analítica
Get PDFFor long time physics problems were resolved using the classical newtonian
Mechanics, i.e., using the theory and equations which Newton had developed. In
this formulation, we get a system of differential equations from knowledge about
forces behaviour in our system of particles. Given the initial position and speed of
our system’s particles, the solution to the previous system gives the temporal
evolution of the system of particles.
The main goal in this paper is to study another formulations of mechanics that, of
course, are equivalent to Newton’s one. Specifically, we will study the basic
concepts of lagrangian Mechanics and the use of variational principles like the
Hamilton’s Principle (from this point of view, the trajectory followed by the system
is such that it minimizes a given functional).Durante mucho tiempo los problemas de la Mecánica se estudiaron desde el punto
de vista newtoniano, esto es, utilizando los resultados y ecuaciones desarrollados
por Newton para el estudio del movimiento de los sistemas de partículas. En esta
formulación, a partir del conocimiento de las fuerzas entre las partículas
constituyentes del sistema, es posible escribir un sistema de Ecuaciones
Diferenciales Ordinarias de segundo orden. Dadas las posiciones y velocidades
iniciales la solución de este sistema proporciona la evolución temporal del sistema
de partículas.
El objetivo de este trabajo es estudiar otras formulaciones de la Mecánica que, por
supuesto, son equivalentes a la formulación newtoniana. Concretamente, se
estudiarán los conceptos básicos de Mecánica lagrangiana y el uso de principios
variacionales como el de Hamilton (desde este último punto de vista, la trayectoria
seguida por el sistema es la que minimiza cierta funcional).Universidad de Sevilla. Doble Grado en Matemáticas y Estadístic
- …
