1,721,051 research outputs found
Mejora de la germinación y crecimiento inicial de plantas de melón (Cucumis melo L.) en condiciones de salinidad mediante tratamientos de priming.
No full textFil: Walser, Patricio Alberto. Universidad Nacional de Luján; Argentina.El melón (Cucumis L.) es sensible a la salinidad principalmente durante la germinación y crecimiento inicial de la plántula, mientras que se comporta como tolerante en el estado de desarrollo y cosecha. El presente trabajo tuvo como objetivo estudiar el efecto de diferentes agentes osmóticos y tiempos de priming (metodología de hidratación controlada previa a la siembra) en la germinación y crecimiento inicial de plantines de melón bajo condiciones de siembra) en la germinación y crecimiento inicial de plantines de melón bajo condiciones de estrés salino producido por sustrato y/o agua de riego. El primer paso fue confeccionar una curva de respuesta de la germinación a niveles crecientes de salinidad. Para determinar la solución y duración de priming con mejores resultados se utilizaron soluciones de PEG 6000 (polietilenglicol 6000), KNO3 (Nitrato de potasio), NaCl (Cloruro de sodio), CaCl2 (Cloruro de calcio) con 24 y 28 h de tratamiento a 25ªC y con luz artificial. la germinación en semillas sin tratamiento se redujo al 50 % con 14 dS m-1 y se inhibió con 20 dS m-1; los mejores resultados fueron alcanzados por priming con NaCl y CaCl2 durante 48 hs con 98 y 94 % respectivamente. Ambos tratamientos mostraron un incremento de los parámetros de crecimiento y clorofila. La aplicación de esta técnica permitiría la producción en zonas que se encuentran inutilizadas o reemplazar los cultivos actuales por uno de mayor rentabilidad
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 Gestión de la Educación Superior Universitaria como Derecho Humano y Bien Público Social
Get PDFSe presentan los instrumentos y mecanismos institucionales que deberían ser creados o mejorados para revertir preservando la calidad - la excesiva disparidad entre los indicadores de entrada y salida a las carreras de grado de la Facultad Regional Delta de la Universidad Tecnológica Nacional, y por extensión a las Facultades de Ingeniería de América del Sur Se analizan los objetivos e impactos de las acciones de gestión académica propuestas para los factores incidentes en la permanencia de alumnos que se definen y caracterizan con un claro sentido de origen en el seno de un grupo de investigación de una institución definida, pero también con una intención de buscar elementos comunes para pensar los problemas de deserción y desgranamiento, de gran importancia estratégica en nuestra región. Año tras año se registra un crecimiento de la matrícula, pero también se observa que no aumenta proporcionalmente la tasa de graduación. La universidad masiva plantea desafíos complejos que van a exigir la aplicación de instrumentos sofisticados para lograr obtener información relevante que permita formular los diagnósticos certeros y las herramientas adecuadas que mejoren las tasas de permanencia y graduación desde una perspectiva inclusiva
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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