1,720,955 research outputs found
Evaluación del comportamiento espacial de las propiedades físico mecánicas de un suelo destinado para producción de papa (Solanum tuberosum) en Tenjo, Cundinamarca
No full text53 páginas : gráficas, ilustraciones, fotografíasThe investigation will be determined with the purpose of determining the behavior and the degree of spatial variability of the physical - mechanical properties of a soil with an agricultural vocation, in this case for a productive species such as potato (Solanum tuberosum). The investigation served to know the techniques of preparation of the land in a crop of the Sabana de Bogotá, specifically in the Carrasquilla village in the municipality of Tenjo, Cundinamarca; These techniques were associated with tillage and irrigation practices.
The methodology included the development of field activities for the collection of data of the physical and mechanical parameters of soil such as: real density, apparent density, resistance to penetration, porosity, saturated hydraulic conductivity, capillarity in the soil and gravimetric humidity, defining a rectangular sampling mesh of 160 mx 120 m, to obtain 40 points over the total test area (1.92 ha). In taking three soil samples for each point at a depth of 22 cm, obtaining a total of 120 samples, subsequently worked in the laboratories of the U.D.C.A.
The analysis methodology was aimed at establishing the linear correlation through descriptive statistics, complementary to a study of univariate geostatistics (adjustment to semivariograms) and bivariate (Kriging interpolation, crossed semivariograms), where the predominant semivariogram models were spherical and the Gaussian Later with the interpolation of Kriging, contour maps will be used that allow a step of their color scale to establish the spatial behavior of the variables in the potato crop and relate their behavior with respect to the other variables identified as the land preparation for crop development.La investigación se desarrolló con el propósito de determinar el comportamiento y grado de variabilidad espacial de las propiedades físico – mecánicas de un suelo con vocación agrícola, en este caso para una especie productiva como la papa (Solanum tuberosum). La investigación sirvió para, conocer las técnicas de preparación del terreno en un cultivo de la Sabana de Bogotá, específicamente en la vereda Jacalito en el municipio de Tenjo, Cundinamarca; Estas técnicas fueron asociadas a prácticas de labranza y riego.
La metodología incluyó el desarrollo de actividades de campo para la recolección de datos de los parámetros físico – mecánicos de suelo como: densidad real, densidad aparente, resistencia a la penetración, porosidad, conductividad hidráulica saturada, capilaridad en el suelo y humedad gravimétrica, definiendo una malla de muestreo rectangular de 160 m x 120 m, para obtener 40 puntos sobre el área total de los ensayos (1,92 ha). Se tomaron tres muestras de suelo para cada punto a una profundidad de 22 cm, obteniendo un total de 120 muestras, trabajadas posteriormente en los laboratorios de la U.D.C.A.
La metodología de análisis fue encaminada a establecer la correlación lineal por medio de estadística descriptiva, complementando con un estudio de geoestadística univariada (ajuste a semivariogramas) y bivariada (interpolación de Kriging, semivariogramas cruzados), donde los modelos de semivariograma predominantes fueron el esférico y el gaussiano. Posteriormente con la interpolación de Kriging se realizaron mapas de contorno que permitieron a través de su escala de color establecer el comportamiento espacial de las variables en el cultivo de papa y relacionar su comportamiento con respecto a las otras variables permitiendo identificar como fue la preparación del terreno para el desarrollo del cultivo.Incluye bibliografíaPregradoIngeniero(a) Geógrafo y Ambienta
Vulnerabilidad al patrimonio cultural ante amenazas antropicas en el sector Pedregal bajo, Municipio de Sogamoso, Boyacá
Get PDFLa investigación se desarrolló con el propósito de determinar cuál es el nivel de vulnerabilidad del patrimonio cultural para el sector de Pedregal Bajo en el municipio de Sogamoso, Boyacá. Es útil para, conocer la percepción de la población frente al patrimonio cultural y arte rupestre presente en la zona y con esto analizar bajo que amenazas se encuentra expuestaThe research was developed with the purpose of determining the level of vulnerability of the cultural heritage for the Pedregal Bajo sector in the municipality of Sogamoso, Boyacá. It is useful to know the perception of the population regarding the cultural heritage and rock art present in the area and with this to analyze under what threats it is expose
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
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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