1,720,971 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
Informe agroclimático anual 2020: Evolución de las variables meteorológicas en la EEA INTA Bella Vista
Full text linkEste informe tiene como objetivo presentar los valores actualizados de variables meteorológicas tales como: precipitaciones, temperaturas (MAX, MIN y MED), Heliofanía efectiva, humedad ambiente y evapotranspiración potencial, durante el año 2020 en comparación con registros históricos tomados en el observatorio meteorológico del EEA INTA Bella Vista.EEA Bella VistaFil: Almirón, Mario Alberto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bella Vista; Argentina
Persistencia de oxitetraciclina en sedimentos de cultivo de langostino blanco Penaeus vannamei y su efecto en bacterias sulfato reductoras (BSR)
No full textUniversidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en AcuiculturaEl objetivo de la investigación fue evaluar la persistencia de oxitetraciclina (OTC) en sedimentos de cultivo de langostino blanco Penaeus vannamei y su efecto en bacterias sulfato reductoras (BSR) evaluando parámetros fisico-químicos del agua y sedimento. Se obtuvo muestras de dos tipos de estanque: el estanque A con suministro de alimento medicado (OTC: 3000 ppm/15 días) y el estanque B sin suministro alimento medicado, ambos en similares condiciones de cultivo. Se establecieron 3 puntos permanentes de muestreo semanal durante 1 mes en los 2 estanques, evaluando 3 perfiles de sedimento, Perfil I (0-3 cm), Perfil II (3-6cm) y Perfil III (6-9cm), así como agua de la interfase agua sedimento y de la columna de agua (h=50 cm). Para el estanque A se determinó que en el Perfil I el contenido de OTC fue de 7,43 mg/Kg luego de 36 días post-tratamiento con una persistencia o vida media (T1/2) = 128 días no encontrándose correlación con la población de BSR (ufc/g) pero si con el contenido de sulfato (ppm) (r = 0,833; p<0,05) y sulfuro de hidrógeno (ppm) (r = -0,649; p<0,05). En conclusión, en el estanque A la población de BSR no se vio afectada por el contenido de OTC en el sedimento cuya actividad bacteriostática fue posiblemente afectada por la alcalinidad y contenido de sulfatos del sedimento; asimismo, los parámetros fisico-químicos de calidad de agua del estanque A indican mejores condiciones de cultivo en comparación con el estanque B a pesar de no encontrarse dentro de los rangos aceptables.The objective of this research was to evaluate the persistence of oxytetracycline (OTC) in white shrimp Penaeus vannamei culture sediments and its effect on sulfate-reducing bacteria (SRB) by assessing physicochemical parameters of water and sediment. Samples were obtained from two types of ponds: Pond A with medicated feed (OTC: 3000 ppm/15 days) and Pond B without medicated feed, both under similar culture conditions. Three permanent weekly sampling points were established for 1 month in the 2 ponds, evaluating 3 sediment profiles, Profile I (0-3 cm), Profile II (3-6 cm) and Profile III (6-9 cm), as well as water from the water-sediment interface and the water column (h=50 cm). For pond A, it was determined that in Profile I the OTC content was 7.43 mg/kg after 36 days post-treatment with a persistence or half-life (T1/2) = 128 days, not finding a correlation with the BSR population (cfu/g) but with the sulfate content (ppm) (r = 0.833; p<0,05) and hydrogen sulfide (ppm) (r = -0.649; p<0,05). In conclusion, in pond A the BSR population was not affected by the OTC content in the sediment whose bacteriostatic activity was possibly affected by the alkalinity and sulfate content of the sediment; likewise, the physicochemical parameters of water quality in pond A indicate better culture conditions compared to pond B despite not being within acceptable ranges
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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