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Mostrando documentos 69252-69271 de 69531
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Weak approximation of minimal norm solutions of first kind equations by tikhonov´s method
Se establecen órdenes de convergencia débil para las soluciones aproximadas obtenidas por el método de regularización de Tikhonov en el caso de problemas lineales "ill-posed" (es decir, aquellos para los cuales las soluciones ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas. -
Weak diameter and cyclic properties in oriented graphs
We describe several conditions on the minimum number of arcs ensuring that any two vertices in a strong oriented graph are joining by a path of length at most a given $k$, or ensuring that they are contained in a common cycle.Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas. -
Wealth Maximization Hypothesis: Accumulated Knowledge Approach
The theoretical foundations of Wealth Maximization Hypothesis. A static approach allows to show how, according to this hypothesis, workers decide about labor and consumption. Specifically this hypothesis states that workes ...Universidad Nacional de Colombia Sede Bogotá Facultad de Ciencias Económicas Escuela de Economía. -
Wear analysis by applying a pin-disc configuration to phemoral head and acetabular cup
This work determines a prosthetic hip system’s life-span, focusing on a Mexican phenotype. The total sliding equivalent distance for the system was determined, as well as the loading regime under which the femoral component ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Biotecnología. -
Wear resistance of vanadium-niobium carbide layers grown via TRD
Nb-V complex carbide coatings were produced on AISI D2 steel substrates using the thermo-reactive diffusion (TRD) process in order to improve the surface hardness and wear resistance of this tool steel. The carbide coating ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Wearable low-cost inertial sensor-based electrogoniometer for measuring joint range of motion
Human movement analysis have become fundamental for a wide range of applications, such as physical therapies, neuro-rehabilitation, sports medicine, human motor system performance assessment and occupational medicine. This ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Web service to support decision-making for beef cattle production systems in Cárdenas- Tabasco, Mexico
The researchers propose a methodology to share, process, and exchange agricultural information among different applications through a Web service. The Web service will be available online and mobile and can be used as a ...Universidad Nacional de Colombia Revistas electrónicas UN Acta Agronómica. -
Web-based spatial data infrastructure: a solution for the sustainable management of thematic information supported by aerial orthophotography
Under the framework of the Spanish National Plan for Aerial Orthophotography in Castilla-La Mancha, a web-based spatial data infrastructure has been developed that allows both the sustainable management of spatial and ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Weber y Sartre: el sentido de la existencia humana
El presente ensayo persigue un objetivo muy modesto, poner en evidencia, destacar, la dimensión existencialista del pensamiento de Weber. Para este propósito, propone una lectura de Weber a partir de la clave que supone ...Universidad Nacional de Colombia Sede Bogotá Facultad de Ciencias Humanas Departamento de Sociología. -
Weber, max. la ética protestante y el espíritu del capitalismo. introducción y edición crítica de francisco gil villegas. méxico, fondo de cultura económica, 2003
Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Sociología. -
Weed population dynamics in rice crops resulting from post-emergent herbicide applications
Studies on weed population dynamics are based on observing and recording changes in weed communities in response to effects of disturbances in crop management. The present study aimed to evaluate weed population dynamics ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Facultad Nacional de Agronomía Medellín. -
Weed recognition by SVM texture feature classification in outdoor vegetable crops images
This paper presents a classification system for weeds and vegetables from outdoor crop images. The classifier is based on support vector machine (SVM) with its extension to nonlinear case using radial basis function (RBF) ...Universidad Nacional de Colombia Revistas electrónicas UN Ingeniería e Investigación. -
Weibull accelerated life testing analysis with several variables using multiple linear regression
In Weibull accelerated life test analysis (ALT) with two or more variables (X2, X3, ... Xk), we estimated, in joint form, the parameters of the life stress model r{X(t)} and one shape parameter β. These were then used to ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Weighted composition operators on multidimensional Lorentz spaces and a glimpse on multipliers between bounded p-variation spaces
In this thesis we study the multidimensional Lorentz spaces via the two-dimensional decreasing rearrangement. In particular, results of interpolation, quasinormability and completeness are stablished, and weights that ...Universidad Nacional de Colombia Sede Bogotá Facultad de Ciencias Departamento de Matemáticas. -
Weighted salience allocation to goals in the unc-method
The KAOS (Knowledge Acquisition autOmated Specifi cation) goal diagram can be used to hierarchically represent and analyze organizational goals. In the context of the UNC-Method, such goals are often written in the ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Weighted time series analysis for electroencephalographic source localization
This paper presents a new method to estimate neural activity from electroencephalographic signals using a weighted time series analysis. The method considers a physiologically based linear model that takes both spatial and ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Welt-geschicte: kunst-geschichte (historia mundial: historia del arte).
Editorial DuMont. 1975Universidad Nacional de Colombia Revistas electrónicas UN Ideas y Valores. -
Westman, robert s. the copernican question. prognostication, skepticism, and celestial order
Berkeley: University of California Press, 2011. 704 pp.Universidad Nacional de Colombia Revistas electrónicas UN Ideas y Valores. -
What happened to the women?: gender and reparations for human rights violations
What happens to women whose lives are transformed and curtailed by human rights violations? What happens to the voices of victimized women once they have their day in court or in front of a truth commission? Women face a ...Universidad Nacional de Colombia Proyectos Temáticos Biblioteca Digital Feminista Ofelia Uribe de Acosta BDF Ciudadanías y democracia. -
What is a mathematical theory?
Since Hilbert' s and Skolem's work in foundations of mathematics we got used to mathematizing the concept of a theory as a theory formalized in first order logic.Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.
