1,720,957 research outputs found
Un aporte a la enseñanza de la sexualidad y la reproducción humana
Get PDFEn este capítulo se desarrollan los fundamentos de una unidad didáctica para la enseñanza del contenido "educación sexual y reproducción humana" en la escuela secundaria.Fil: Bazylenko, Andriy. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; ArgentinaFil: Pacheco Rudz, Erika Odila. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; ArgentinaFil: de Dios, María Cecilia Coral. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; ArgentinaFil: Plaza, María Victoria. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; ArgentinaFil: Gonzalez Galli, Leonardo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; ArgentinaFil: Meinardi, Elsa Noemi. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Formación e Investigación en Enseñanza de las Ciencias; Argentin
Influence of forest monocrops and a native pastizal on physicochemical properties in the Pampean Plain
Get PDFEl objetivo del trabajo fue estudiar la influencia de dos forestaciones y un pastizal nativo sobre propiedades fisicoquímicas de un suelo en provincia de Buenos Aires, Argentina. Se seleccionaron tres tipos de cubiertas vegetales: Pino (Pinus elliottii Engelm), Eucalipto (Eucalyptus dunnii Maiden) y un pastizal nativo. Se midió carbono de respiración, glomalina total, carbono orgánico y estabilidad de los agregados del suelo. Se observó mayor actividad microbiológica debajo del pastizal. La glomalina total, mostró mayores valores en suelos forestales. Los valores de estabilidad estructural tendieron a ser mayores en el suelo bajo la influencia del Pino. Se encontró una vinculación positiva entre los valores de glomalina, materia orgánica y estabilidad estructural hallados bajo la influencia de las especies forestales en estudio con respecto al pastizal nativo. Los mayores valores de respiración hallados bajo el pastizal podrían indicar (desde el punto de vista microbiológico) una mejora en las condiciones del suelo.Centro de Investigaciones Geológica
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
Bioavailability of potentially toxic elements in soils of the banks of the Morón stream, Buenos Aires province
Get PDFEl objetivo de este trabajo fue evaluar la biodisponibilidad de ciertos elementos potencialmente tóxicos (EPT) en los suelos aledaños en un tramo rectificado del arroyo Morón. Para ello se llevó a cabo un muestreo de la llanura de inundación del cauce y del dique artificial contiguo. Se realizó un fraccionamiento secuencial para los EPT (Cu, Zn, Cr, Ni, Cd y Pb) y se midió el pH y la conductividad eléctrica de las muestras. Se observó que dichos elementos se encontraron mayormente asociados a la fracción inorgánica por lo que su disponibilidad es baja. En la llanura de inundación se encontraron valores bajos de Cu y Zn, mientras que la concentración de Cd, Cr, Ni y Pb se incrementó, con respecto a las muestras del área del dique; atribuyendo estas diferencias a los cambios en la concentración de los EPT estudiados en el cuerpo de agua a partir de la rectificación del arroyo.Centro de Investigaciones Geológica
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
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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