1,720,993 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
Aspectos biológicos y daño de la pulguilla de la alfalfa (Sminthurus viridis) en Uruguay.
No full text- La pulguilla de la alfalfa provoca daño en otoño y primavera,principalmente en leguminosas forrajeras.- Se identifica por su forma globosa (1,5-2 mm) y por saltar al ser perturbada- El daño es fácil de reconocer ya que las hojas quedan transparentes (rae la epidermis).- El manejo se basa inicialmente en pastorear o cortar la pastura dañada, y revisar luego de 7 días. - Los insecticidas solo se utilizan en casos de daño severo y persistente.CONSIDERACIONES FINALESAntes de recurrir al control químico se debe realizar la correcta identificación del daño y del agente causaldel mismo, pues no todos los insectos que habitan nuestras pasturas causan daños. La pasturadebe ser monitoreada periódicamente.El objetivo de un programa de manejo integrado (MIP) es reducir el daño causado por una plaga a nivelestolerables, para sostener el equilibrio del ecosistema se debe permitir ciertos niveles de daño.Se recomienda consultar a su técnico de campo antes de considerar un manejo químico y considerarestrategias de control cultural. El uso indiscriminado de insecticidas tiene consecuencias directas en elsistema ecológico del pastizal
Protección de pasturas durante la implantación.
No full textUna buena implantación es el cimiento para pasturas de alta productividad. Este artículo trata sobre cómoproteger a las pasturas, durante su fase inicial, de enfermedades,plagas y malezas.Los tres primeros meses pos-siembra son críticos para el establecimiento de pasturas productivas. Todas lasprácticas de manejo que contribuyan a una rápida germinación y un vigoroso establecimiento de plántulascontribuyen ,también, a minimizar la incidencia de enfermedades,plagas y malezas. Un buen barbecho dela chacra, alta calidad de semilla, siembra en fechas óptimas y a densidades correctas, fertilización apropiaday regulación de la sembradora en función de la cama de siembra, juegan un rol fundamental para potenciar elresultado de cualquier medida de protección vegetal
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
Foundations and developments of pest management in Uruguay a review of the lessons and challenges.[Cimientos y desarrollo del manejo de plagas en Uruguay una revisión de las lecciones y los desafíos].[Fundamentos e desenvolvimento do manejo de pragas no Uruguai uma revisão das lições e desafios].
No full textISOCAS: la importancia de conocer su biología para optimizar su manejo.
No full textEl conocimiento de la biología de las isocas es una herramienta de gran valor para evitar o atender a tiempo los problemas causados por estos insectos en pasturas y cultivos. El presente artículo aborda en forma ilustrativa los principales aspectos de su biología, daños y manejos agronómicos recomendados
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
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