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Search Results: 1 - 10 of 203809 matches for " Nú?ez "
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Climate Change in La Plata Basin as Seen by a High-Resolution Global Model  [PDF]
Mario N. Nu?ez, Josefina Blázquez
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.42029

This paper analyses the climate change in La Plata Basin, one of the most important regions in South America due to its economy and population. For this work it has been used the Meteorological Research Institute (MRI) and the Japanese Meteorological Agency (JMA) atmospheric global model. For both near and far future, the projected changes for temperature over the entire basin were positive, although they were only statistically significant at the end of the XXI century. Changes in the annual cycle of mean temperature were also positive in all subregions of the basin. Regarding precipitation, there were no changes in the near future that were statistically significant. The summer (winter) is the only season where both models project positive (negative) changes for both periods of the future. In the transitional seasons these changes vary depending on the spatial resolution model and the area of study. The annual cycle showed that the largest changes in precipitation (positive or negative) coincide with the rainy season of each subregion. Regarding the interannual variability of temperature, it was found that the 20 km. model pro-jected a decrease of this variability for both near and far future, especially in summer and autumn. On the other hand, the 60 km. ensemble model showed a decreased of year-to-year variability for summer and an increase in winter and spring. It was also found that both models project an increase in precipitation variability for winter and summer, while in other seasons, only the 60 km. ensemble model presents the mentioned behavior.

An Analytic Study of the Reversal of Hartmann Flows by Rotating Magnetic Fields
Manuel Nú?ez
International Journal of Mathematics and Mathematical Sciences , 2012, DOI: 10.1155/2012/641738
Abstract: The effects of a background uniform rotating magnetic field acting in a conducting fluid with a parallel flow are studied analytically. The stationary version with a transversal magnetic field is well known as generating Hartmann boundary layers. The Lorentz force includes now one term depending on the rotation speed and the distance to the boundary wall. As one intuitively expects, the rotation of magnetic field lines pushes backwards or forwards the flow. One consequence is that near the wall the flow will eventually reverse its direction, provided the rate of rotation and/or the magnetic field are large enough. The configuration could also describe a fixed magnetic field and a rotating flow. 1. Introduction In [1], a generalization of the Hartmann flow was announced. The Hartmann flow is a parallel one influenced by a strong transversal magnetic field [2, 3] and has been studied intensively for its role in many aspects of plasma physics, such as liquid metal pumping [4, 5], plasma convection [6, 7], and geophysics [8]. We now will allow the background magnetic field to rotate while keeping its spatial uniformity. Our aim in this paper is to analyze in depth the action of this field upon the flow through the Lorentz force, emphasizing the possibility of flow reversal at some time near the walls confining the fluid. Given the Galilean invariance of the relevant equations, we could change to a rotating reference frame and interpret the problem as consisting in a fixed magnetic field and a rotating flow; this configuration could perhaps be more easily constructed and have wider applications. Let us begin by recalling briefly the MHD equations appropriate for our configuration. The flow will be assumed two dimensional, and the background magnetic field will be uniform in space but rotating in time at a rate given by the angle : Although this field will create a secondary one , it is assumed that all the terms in may be neglected when an analogous one for is present; thus, , . This does not hold for the current density, as , . The approximate induction equation becomes where is the flow velocity and the resistivity. By substituting by its value in (1.1), uncurling (1.2) to find and taking it to the Lorents force , we may write the momentum equation as where is the conductivity, the viscosity, and is the sum of the pressure and the gauge obtained by uncurling (1.2). Detailed calculations may be found in [1]. If in analogy with the classical Hartmann flow we assume a horizontal flow , (1.3) reduces to where includes all the conservative forces upon the
El capital intelectual en la gestión del conocimiento
Osorio Nú?ez,Maritza;
ACIMED , 2003,
Abstract: intellectual resources in the frame of knowledge management is frecuently found in the literature on enterprise management published by developed countries, because, among other reasons, to the concern given to information and knowledge in the increase of competition in the market. aimed al defining the concepts of knowledge management and intelectual resources and also showing some existing models to assess the intelectual resources of a given organization. a literature review available in internet using the search engines: google and excite was carried out. after the analysis of initials results, 20 bibliographic sources suitable to the teaching approach of this research were chosen. some of the leading capitalist enterprise such as microsoft, american airlines and skandia insurance company use diferent models to assess their intellectual resources intended to determine strenght and weakness in this crucial area for the surviving of modern organization. the study of intellectual resources, in any area of activity: finances, business, economy or others is of paramount importance to identify the resources available in an enterprise.
AMIGA: una metodología integral para la determinación y la satisfacción dinámica de las necesidades de formación e información en las organizaciones y comunidades
Nú?ez Paula,Israel;
ACIMED , 2004,
Abstract: starting from 9 basic process: organization and environment diagnosis, identification and registration of internal and external potential users/clients, determination of segments and potential users/clients groups according their needs and availabilities, establishment of priorities among groups for learning management, definition of differential politics of offer, determination of learning needs (availabilities), systematization of learning management technology and quality and usefulness assessment of these process a methodology had been created aimed at identifying in a dinamic and lasting fashion the formation and information needs in the main analysis level of community and organization. this methodology paves the way to the variable choice, information sources and also data obtain techiques. the methodology responds to a theorical methodological approach or a conceptual system of social-psychological ground and also fulfill the contemporary requirements of systematization and permanent internal auditorship as well as the national policies regarding the improvement of information systems, knowledge management introduction and enterprise improvement.
La gestión de la información, el conocimiento, la inteligencia y el aprendizaje organizacional desde una perspectiva socio-psicológica
Nú?ez Paula,Israel;
ACIMED , 2004,
Abstract: aimed at creating a conceptual base useful to understand information management, knowledge, intelligence and organizational learning, from a sociopsychological perspective, a review of the literature available on these topics are made. with a social and organizational orientation, the concepts of information, knowledge, communication, intelligence and learning are defined as well their main clasification and relations. the created base is an excellent tool to understand the basic elements of the theorical frame of knowledge management and arranged learning and also to change the designs toward a social-psichological management sometimes neglected literature.
Taller de Magister, Primavera 2001: Proyecto sin casa
ARQ (Santiago) , 2002, DOI: 10.4067/S0717-69962002005200011
Abstract: portal and nú?ez developed the projects presented here in the context of a ma in architecture studio workshop. both place their projects at the west side of alameda avenue, near the central railway station and the bus terminals; a rather derelict area which has paradoxically been treated as a backyard instead of one of the entrance doors to the city. this projects work with that deteriorated reality, which provides the backdrop for the case studies the projects in question engage with: namely interurban buses drivers and cardboard gatherers, who have both, for diverse reasons, set themselves apart from official urban routines.
Los saberes campesinos: Implicaciones para una educación rural
Investigación y Postgrado , 2004,
Abstract: the main purpose of this research was the reconstruction of the dynamics and typology of the peasants knowledge in the state of táchira in different spaces and environments contexts, both as cultural inheritance of rural communities and as an essential basis for the definition of the educational process in the upbringing of the peasants, as seen from an anthropological and cultural points of view, and inserted in the framework of a new rurality. we used the phenomenological and hermeneutic methods in three different rural, cultural and environmental scenarios -páramo, mountain and foothills- in the táchira state and in three different peasant generations -senior, adults and youngsters. that allowed us to recreate, reconstruct and revaluate the subjective peasant knowledge and objectively in their inter and intra generational daily practices. this analysis allowed us to determine eight integrative categories and their corresponding emerging concepts which helped us to set the basis for our pedagogía de los saberes campesinos (pedagogy of the peasant knowledge) that, after the reconstitution of the local knowledge, will have consequences in the searching of rural education with a better social and cultural pertinence.
Prácticas sociales campesinas: Saber local y educación rural
Investigación y Postgrado , 2008,
Abstract: the present study was developed during the years 2003-2006 as part of the research project ?farmers, education and rurality? at the rural pedagogical institute gervasio rubio. eight rural teachers, graduate students registered in the rural education program, took part in the study. the goal was to reassess main social practices in order to systematize, socialize and validate the students? experiences and in so doing generate teaching products that contribute with the formation of rural societies within a socio-culturally sensitive environment. the reassessed participative research tool was used to analyze eight social practices: 1) traditional technologies; 2) natural and cultural biodiversity; 3) culinary practices; 4) music; 5) myth and legends; 6) popular sayings; 7) farmer?s tools and belongings; and, 8) reciprocal relations. based on the results, we were able to develop didactic resources (videos, cds, primers) for rural schools and a body of pedagogical strategies that could be incorporated into the rural teacher?s praxis, classroom projects, productive projects, community projects and national educational policies.
"Lo que el desarrollo se llevó". Modernidad y nostalgia en Sonora
Nú?ez Noriega, Guillermo;
Estudios sociales (Hermosillo, Son.) , 2009,
Abstract: i present the results of an analysis of three cultural products that textualize a poetic of objects of rural origin in the state of sonora, mexico. the analysis is based on the theoretical and methodological framework of frederic jameson on the three levels of discursive articulation. the interpretation takes place from different theoretical approaches on the production, circulation and consumption of objects, from marxism to postmodernism. we conclude with a reflection on the importance of understanding the cultural dimensions of the processes of regional development and its contribution to current discussion about post-development.
Morfología Fibrosa de la Madera del Eucalyptus grandis Implantado en la Mesopotamia Argentina. 2. Definición de los tipos morfológicos de fibras: Fiber Morphology of the Wood of Eucalyptus grandis Growing in the Argentinean Mesopotamia. Definition of the morphological types of fibers
Nú?ez,Carlos E.;
Revista de ciencia y tecnolog?-a , 2009,
Abstract: the present research work is part of a series on fiber morphology from exotic eucalyptus tree wood in mesopotamia, argentina. (mesopotamia comprises misiones, corrientes and entre ríos provinces). facing difficulties regarding the classification of different fibrous types using botanical definitionsm the task was based on some paper related parameters and pits density. some pairs of variables were tested and the relationship between pits and fieltrability was selected. five hundred elements were tested, plotted and grouped into 3 defined types with an a population of libriform fibers regardless type and amount of pits and a fieltrability coefficient greater than 70, a b population of elements having a fieltrability coefficient lower than 70 and a pit density lower that 80 pits/mm and a c population with an irrelevant number of elements and paper features consisting of vasicentric tracheids (elements with more that 80 pits/mm). we can define in this fashion a disgregate fiber sample as a function of the proportion of the population mentioned, since a pure a population pulp should have good physico-mechanical properties and a pure population b better formation properties. because both types have different in tree physiological properties, a genetic improvement could be developed in order to obtain different species suitable to specific purposes. it could be established that fibers cannot be defined by the type and quantity of pits as it is the case of general botanical definitions.
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