1,720,957 research outputs found
Horizonte y sendero óptimos
No full text¿Why natural resources economics is important? Mathematics is useful in Physics and Chemistry. Now, in Economics. This paper shows Hotelling’s model and its development across the time. It explains mathematical concepts used by that author in order to demonstrate the rationality of public and private owners and to explore which way would be best one in the of preserving natural resources.¿Porqué la economía de los recursos naturales es importante? Las matemáticas son útil en Física y Química. Ahora, en Economía. Este artículo muestra el modelo de Hotelling y su desarrollo por el tiempo. Explica conceptos matemáticos usados por este autor en el orden demostrar la racionalidad de los dueños públicos y privados, y explorar qué manera sería mejor para conservar recursos naturales
Horizonte y sendero óptimos
No full text¿Why natural resources economics is important? Mathematics is useful in Physics and Chemistry. Now, in Economics. This paper shows Hotelling’s model and its development across the time. It explains mathematical concepts used by that author in order to demonstrate the rationality of public and private owners and to explore which way would be best one in the of preserving natural resources.¿Porqué la economía de los recursos naturales es importante? Las matemáticas son útil en Física y Química. Ahora, en Economía. Este artículo muestra el modelo de Hotelling y su desarrollo por el tiempo. Explica conceptos matemáticos usados por este autor en el orden demostrar la racionalidad de los dueños públicos y privados, y explorar qué manera sería mejor para conservar recursos naturales
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
La geometría de las formas de la naturaleza
No full textThe attempt to rationally domínate the concepts of space gave place to the birth of Geometry. Mathematics as a whole is permeated by a sense of geometry. And it could be no other way, considering the eminently visual and spatial character of a great part ofmathematics, and given the fact that there is a tendency to obtain clarification of even the most abstract ideas in an intuitive and graphic manner.Nature's geometrical shapes will be classified according to shape-function, shape-metrics and shape-complexity binomials. This article takes up again the taxonomy of the most commonshapes in nature, emphasizing their mathematical expression and analysing their functionality and their structure as the fundamental elements that have made them prevail.As a product of the Mathematics Laboratory research Project of the "Grupo de Investigación en Ciencias Básicas Da Vinci", this article shows the undeniable relationship between geometry, shape and structures as they present them selves innature , exploring shapes in a different way than the formal developments that are proper of Geometry.El intento por dominar racionalmente el espacio dio lugar a la Geometría. La totalidad de las matemáticas se encuentran invadidas por el sentido geométrico; y no podía ser de otra manera, dado el carácter eminentemente visual y espacial de una gran porción de la intelección matemática y dada la tendencia manifiesta a aclarar hasta las ideas más abstractas, de una forma intuitiva y gráfica. Las formas geométricas de la naturaleza se clasificarán atendiendo a los binomios forma-función, forma-métrica y forma complejidad. Este artículo retoma la taxonomía de las formas más comunes en la naturaleza, recalcando su expresión matemática y analizando su funcionalidad y estructura como elementos fundamentales que las han hecho prevalecer.
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
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