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Search Results: 1 - 10 of 24026 matches for " Torralbo-Rodríguez "
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La investigación en Educación Matemática a través de las publicaciones científicas espa olas
Bracho-López, Rafael,Maz-Machado, Alexander,Gutiérrez-Arenas, Pilar,Torralbo-Rodríguez, Manuel
Revista Espa?ola de Documentación Científica , 2012,
Abstract: We present a bibliometric study of research articles on mathematics education, as well as an analysis of networks of collaboration in the same, based on a sample of Spanish journals published during the period 1999-2008. For this purpose we analyzed 774 articles published in the eight most representative Spanish journals in the field. The results show compliance with scientometric laws and patterns, as well as verifying the low level of scientific collaboration among researchers in the area, as well as among institutions. Se presenta un estudio bibliométrico y de análisis de las redes de colaboración en los artículos de investigación en Educación Matemática publicados en una muestra de revistas espa olas en el período 1999-2008. Para ello se han analizado los 774 artículos publicados en un conjunto de ocho revistas espa olas representativas verificándose el cumplimiento de las leyes o patrones propios de la Cienciometría y comprobándose un bajo grado de colaboración científica entre los investigadores del área y también entre las instituciones.
Análisis bibliométrico de la producción científica de la Universidad de Málaga en el Social Sciences Citation Index (1998-2007)
Maz-Machado, Alexander,Torralbo-Rodríguez, Manuel,Vallejo-Ruiz, Mónica,Bracho-López, Rafael
Revista Espa?ola de Documentación Científica , 2010,
Abstract: A bibliometric analysis was performed of the scholarly production of the University of Malaga published during 1998-2007 in journals indexed in the Social Sciences Citation Index (as accessed through the Web of Science). This paper examines productivity and chronological distribution, national and international collaboration, scientifi c production by departments, and the journals in which articles were published. The results reveal a slight increase in productivity, as well as a slightly higher level of co-authorship (2.85) than the average for social sciences in Spain, along with a good level of collaboration with national and foreign academic institutions. Se realiza un análisis bibliométrico de la producción de la Universidad de Málaga durante el período 1998-2007 en las revistas indexadas en el Social Sciences Citation Index, accediendo a la base de datos a través de la Web of Science. Se ha estudiado la productividad y la distribución temporal, la colaboración nacional e internacional, la producción científi ca por facultades y las revistas en las que se publican los artículos. Los resultados revelan un leve incremento en la productividad, así como un grado de coautoría (2,85) ligeramente superior al establecido para las Ciencias Sociales en Espa a y un buen nivel de colaboración con instituciones universitarias nacionales y extranjeras.
Análisis cienciométrico de las tesis doctorales espa olas en Educación Matemática (1976-1998)
Fernández Cano, Antonio,Torralbo Rodríguez, Manuel,Rico, Luis,Gutiérrez, Pilar
Revista Espa?ola de Documentación Científica , 2003,
Abstract: This study accomplishes a scientometric review relative to productivity and citation indicators over a sample of doctoral dissertations about Mathematics Education, defended in the Spanish university during the period 1976-1998. We have analysed 135 retrieved thesis using an ad hoc instrument for data collection. Strong scientometric patterns are inferred which could help the Spanish Mathematics Education stand on a sounder scientific status. Este estudio realiza una revisión cienciométrica usando indicadores de productividad y citación en una muestra de tesis espa olas sobre Educación Matemática defendidas en la Universidad espa ola desde 1976 hasta 1998. En concreto, se han analizado 135 tesis recuperadas usando un instrumento de recogida de datos ad hoc. Se infieren patrones cienciométricos contundentes que podrían ayudar a posicionar la Educación Matemática espa ola sobre un estatus científico más firme.
Patrones de citación en la investigación espa ola en educación matemática
Vallejo Ruiz, Mónica,Fernández Cano, Antonio,Torralbo Rodríguez, Manuel
Revista Espa?ola de Documentación Científica , 2006,
Abstract: This paper offers a longitudinal background of citation trends in the field of mathematics education using as population for study the doctoral dissertations of this field contained in the Spanish database TESEO during the years 1975 to 2002. In this way, we developed a longitudinal study over several characteristics of the bibliography included in these dissertations such as: citation language, bibliographic resources and cited average life (obsolescence index). As relevant findings of this study we would emphasize the existence of a pattern of 200 references by thesis, the predominance of the English language in the journals, while the Spanish language prevails in books. Two journals (Journal for Research in Mathematics Education and Educational Studies in Mathematics) are extensively the most mentioned. En este artículo se muestra una visión diacrónica de las tendencias de citación en el campo de la Educación Matemática, tomando como población de estudio las tesis doctorales de dicho campo contenidas en la base TESEO durante los a os 1975-2002. Para ello realizamos un estudio longitudinal sobre distintos aspectos relativos a la bibliografía recogida en tales informes doctorales, tales como: idioma de las citas, fuentes bibliográficas, antigüedad media de las citas, etc. Como hallazgos relevantes de este estudio destacaríamos la existencia de un patrón de 200 referencias, el predominio del idioma inglés en las revistas, en tanto que el espa ol predomina en libros. Dos revistas (Journal for Research in Mathematics Education y Educational Studies in Mathematics) son extensamente las más citadas.
Producción científica sobre Educación Multicultural contenida en las bases de datos Social Sciences Citation Index y Arts & Humanities Citation Index
Vallejo Ruiz, Mónica,Oca?a Fernández, Almudena,Bueno Sánchez, ángel,Torralbo Rodríguez, Manuel
Revista Espa?ola de Documentación Científica , 2005,
Abstract: This paper is an inquiry into the productivity on multicultural education using a list of documents retrieved from two databases of Institute for Scientific Information (ISI), Philadelphia, Social Sciences Citation Index and Arts & Humanities Citation Index during the period 1956 to 2003. Scientometrics indicators relative to longitudinal production, authors and institutional productivity, journal and citations patterns are offered, which allowed a description of the international production in this educational field and to establish evaluative inferences. Este estudio indaga la productividad en educación multicultural en base a una lista de documentos incluidos en dos bases del Institute for Scientific Information (ISI) de Filadelfia: Social Sciences Citation Index y Arts & Humanities Citation Index, durante el periodo 1956-2003. Se ofrecen una serie de indicadores cienciométricos relativos a diacronía, productividad personal e institucional, revistas editoras y patrones de citación, los cuales permiten describir la producción internacional en este campo educativo y establecer inferencias evaluativas sobre el mismo.
Methodology and Equations of Mineral Production Forecast
—Part I. Crude Oil in the UK and Gold in Nevada, USA. Prediction of Late Stages of Production
 [PDF]

Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.35040
Abstract:

The equations of mineral production forecast link the change in time of mineral reserves with the production and the ratio of reserves to production. These equations allow us to model the development of the mineral resources evaluated at any scale. Probabilistic bidimensional charts made from montecarlo simulations provide intervals of confidence for the forecasts. The set of equations is devised and presented for a variety of applications to the oil and gas industry, as well to the production of any other mineral resource, either metals or non metals, whose ore deposit volumes and production might be quantified. The cases studied in the UK and USA are at late stages of production, periods for what the equations are most suitable to be applied without further adjustments. Experimental design allows the diagnosis of the likely values of the variables pertaining to the equations, in order to achieve the results provided by conventional production forecasts or to explore other scenarios of investigation. The method can be practical to evaluate commitments of production of mineral resources with time, to support strategic plans for companies, corporations, countries or regions based on those evaluations, for the screening and ranking of mineral assets based on their production potential and many other tasks where the prediction of future volumes of mineral production is required.

Methodology and Equations of Mineral Production Forecast. Part II. The Fundamental Equation. Crude Oil Production in USA  [PDF]
Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.36044
Abstract:

The fundamental equation of mineral production allows to model and design the dynamics of mineral production, however complex they are or could be. It considers not only the case of a constant production to reserves ratio for given intervals of time, but with a piecewise approach, it is also enabled to account the variation on time of this ratio. With a constant production to reserves ratio, the limit expression of the fundamental equation takes the form of an Erlang distribution with a fixed shape parameter. The rate parameter equals the scale factor. The discrete piecewise version, instead of considering the reserves and the production to reserves ratio being constant through certain intervals of time, updates both variables by units of time. This version, using either lineal or non lineal functions for the variables involved, let to model known production profiles or to forecast them by experimental design. The Hubbert’s linearization updated with recent data and the p-box method applied to determine ultimate recovery of U.S. crude oil reserves indicate official accounts underestimate them. The analysis of the ideal model of production based on Hubbert’s linearization and curve, can be made by decomposing it in the distribution with time of the reserves and of the production to reserves ratio. The distribution of reserves with time is synchronized for both the ideal Hubbert’s curve and real profiles, disregarding whether they match or not. The departure of real profiles from the ideal Hubbert’s curve lies on the differences or correspondences of the distribution with time of the production to reserves ratio. The MonteCarlo simulation applied to forecast US crude oil production for the next five years points to a slow decline, with average annual yields presenting a difference lower than 10% between the start and the end of the simulation.

The Hypothesis of Hyperia from the Perspective of Neuronal Plasticity  [PDF]
Javier álvarez-Rodríguez
Open Journal of Medical Psychology (OJMP) , 2016, DOI: 10.4236/ojmp.2016.51003
Abstract: We analyze certain mental automatisms appearing in the consciousness with phenomenological features of simple partial seizures (SPSs). We propose to include all these phenomena into a cognitive function to which we term hyperia. In this paper, we analyze the similarities between the nature of this cognitive function and the mechanisms used by our brain to elicit neuronal plasticity.
Más no siempre es mejor: procesamiento de estímulos visuales y límites de capacidad
Ana Torralbo
Ciencia Cognitiva : Revista Electrónica de Divulgación , 2008,
Abstract: Gran parte de nuestra interacción con el entorno se desencadena a partir del procesamiento visual de los estímulos que nos rodean. Pero, cómo puede nuestro cerebro manejar la gran cantidad de estimulación a la que estamos sometidos continuamente? Estudios recientes indican que la respuesta neuronal a los estímulos visuales se ve afectada por las limitaciones de procesamiento del cerebro.
Compact minimal surfaces in the Berger spheres
Francisco Torralbo
Mathematics , 2010,
Abstract: We construct compact arbitrary Euler characteristic orientable and non-orientable minimal surfaces in the Berger spheres. Besides we show an interesting family of surfaces that are minimal in every Berger sphere, characterizing them by this property. Finally we construct, via the Daniel correspondence, new examples of constant mean curvature surfaces in the products S^2 x R, H^2 x R and in the Heisenberg group with many symmetries.
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