1,720,968 research outputs found
Identificación de las posibles causas que afectan el desarrollo normal del Eucalipto (Eucalyptus glóbulos) en el bosque Belencito-Boyacá.
No full textGraficas, Tablas e Imagenes.Estos análisis determinaron que a los bosques de la empresa no se les ha dado un manejo adecuado en su mantenimiento y conservación.
Con los resultados obtenidos se logra encontrar una solución que disminuya el problema a través del mejoramiento y conservación de estos bosques
Dinámica de la producción de palma de aceite y su relación con los elementos disponibles en el tejido foliar: estudio de caso en el municipio de Codazzi, Cesar
No full textEl objetivo de este estudio fue establecer la relación entre los elementos nutricionales presentes en el tejido foliar de la palma de aceite con el rendimiento productivo en Codazzi, Cesar, durante un período de cinco años. Los hallazgos más importantes indican una disminución significativa en la producción de racimos, sin variación notable en el peso de los racimos lo que se sugiere que, factores externos como el manejo agrícola y las condiciones climáticas afectan notoriamente el rendimiento del cultivo. El análisis de los nutrientes en el tejido foliar reveló variaciones en elementos como magnesio (Mg), hierro (Fe) y zinc (Zn), con una influencia limitada en la producción. Además, las interacciones nutricionales entre calcio, magnesio y potasio mostraron correlación positiva en algunos años, aunque no fueron consistentes. La correlación entre nitrógeno y fósforo también influyó levemente en la producción de racimos. El manejo agrícola y las condiciones ambientales parecen ser determinantes en la productividad de la palma de aceite, más allá de las interacciones nutricionales, lo que resalta la necesidad de una estrategia integral para mejorar la producción
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
Evolución del contenido de elementos nutrientes en suelos cultivados con cebolla de bulbo
Get PDFEl objetivo del estudio fue determinar la evolución del contenido de nutrientes en suelos destinados al cultivo comercial de cebolla de bulbo (Allium cepa) en el municipio de Tibasosa, Boyacá. En un suelo sulfic endoaquepts se establecieron tres tratamientos: Sin fertilización (T1), con fertilización convencional de la zona (T2) y fertilización con base en el análisis de suelos (T3). Se recolectaron muestras para análisis 20 días antes de la siembra y a los 45, 90 y 120 días después de la siembra (DDS). Los contenidos de macroelementos se presentaron en el orden N and gt;Ca and gt;K and gt;Mg and gt;S and gt;P y los de micronutrientes Mn and gt;Fe and gt;Zn and gt;Cu and gt;B existiendo interacciones positivas entre N/Fe, P/K, P/Ca, P/Mg, K/Mg, K/S, Mg/S, B/Zn y Cu/Mn y negativas entre N/K, N/S, P/Fe, K/Fe, Mg/Fe, B/Fe, S/Fe, Cu/Zn y Zn/Mn afectando su concentración y disponibilidad. Los análisis permitieron inducir que un contenido adecuado de nutrientes incrementa el rendimiento en la zona. Palabras claves: Allium cepa, Sulfic endoaquepts, Fertilidad.To determine the evolution of nutrient content in soils dedicated to commercial onion crop (Allium. cepa) in the municipality of Tibasosa, Boyacá,Colombia, in a Sulfic endoaquepts soil, three treatments established: Without fertilization (T1), conventional fertilization used in the area (T2) and fertilization according to analysis of soils (T3). Samples were collected for analysis 20 days before plantation and 45, 90 and 120 days after sowing. The of contents macroelements showed the following order N and gt;Ca and gt;K and gt;Mg and gt;S and gt;P and those of micronutrients, Mn and gt;Fe and gt;Zn and gt;Cu and gt;B. There were positive interactions among N/Fe, P/K, P/Ca, P/Mg, K/Mg, K/S, Mg/S, B/Zn and Cu/Mn and negative interactions among N/K, N/S, P/Fe, K/Fe, Mg/Fe, B/Fe, S/Fe, Cu/Zn and Zn/Mn affecting their concentration and availability. The results evidence that a balanced content of nutrients can increase the yield. Key words: Allium cepa, Sulfic endoaquepts, Fertility
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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