696 resultados para Barbetti, Eusebio.
Resumo:
Los microemprendimientos productivos surgen en la última década como una opción alternativa para el tratamiento de la problemática laboral de los jóvenes en América Latina. En este trabajo realizamos una discusión sobre el alcance y las características de este tipo de intervenciones, analizando sus potencialidades y sus limitaciones en contextos con elevados índices de pobreza y mercados de trabajo deprimidos. En el texto, luego de realizar una breve revisión del estado del arte sobre el tema, presentamos los avances de un estudio en el que analizamos los primeros resultados de un programa implementado, hace algunos años, en la Ciudad de Resistencia (Provincia del Chaco) con dicho objetivo
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Las prácticas laborales en empresas y pasantías configuran, en las últimas décadas, una de las estrategias promovidas desde los programas sociolaborales para mejorar el acceso de los jóvenes a ocupaciones dentro del sector formal de la economía. En este trabajo realizamos una discusión sobre el alcance y las particularidades de este tipo de intervenciones, focalizando el análisis en las características que asume la participación del sector empresarial. En el texto, luego de una breve revisión del estado del arte sobre el tema, presentamos los avances de un estudio en el que analizamos los primeros resultados de un programa que actualmente se implementa en la Ciudad de Resistencia (Provincia del Chaco) e incluye este tipo de acciones. Además de identificar los ejes teóricos-conceptuales que orientan la propuesta y sus principales componentes, intentamos caracterizar el perfil de aquellas organizaciones que se sumaron a la propuesta, los motivos que orientaron esta decisión y algunas de sus prácticas, como uno de los actores centrales del programa
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Fil: Barbetti, Claudia. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.
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Fil: Barbetti, Claudia. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.
Resumo:
Las prácticas laborales en empresas y pasantías configuran, en las últimas décadas, una de las estrategias promovidas desde los programas sociolaborales para mejorar el acceso de los jóvenes a ocupaciones dentro del sector formal de la economía. En este trabajo realizamos una discusión sobre el alcance y las particularidades de este tipo de intervenciones, focalizando el análisis en las características que asume la participación del sector empresarial. En el texto, luego de una breve revisión del estado del arte sobre el tema, presentamos los avances de un estudio en el que analizamos los primeros resultados de un programa que actualmente se implementa en la Ciudad de Resistencia (Provincia del Chaco) e incluye este tipo de acciones. Además de identificar los ejes teóricos-conceptuales que orientan la propuesta y sus principales componentes, intentamos caracterizar el perfil de aquellas organizaciones que se sumaron a la propuesta, los motivos que orientaron esta decisión y algunas de sus prácticas, como uno de los actores centrales del programa
Resumo:
Fil: Barbetti, Claudia. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.
Resumo:
Los microemprendimientos productivos surgen en la última década como una opción alternativa para el tratamiento de la problemática laboral de los jóvenes en América Latina. En este trabajo realizamos una discusión sobre el alcance y las características de este tipo de intervenciones, analizando sus potencialidades y sus limitaciones en contextos con elevados índices de pobreza y mercados de trabajo deprimidos. En el texto, luego de realizar una breve revisión del estado del arte sobre el tema, presentamos los avances de un estudio en el que analizamos los primeros resultados de un programa implementado, hace algunos años, en la Ciudad de Resistencia (Provincia del Chaco) con dicho objetivo
Resumo:
Fil: Barbetti, Claudia. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.
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The South China Sea (SCS) is well connected with the western Pacific and influenced by the East Asian monsoon. We have examined temporal variations in radiocarbon marine reservoir ages (R) and regional marine reservoir corrections (DeltaR) of the SCS during the Holocene using paired measurements of AMS 14C and TIMS 230Th on 20 pristine corals. The results show large fluctuations in both R and DeltaR values over the past 7500 years (yrs) with two distinct plateaus during 7.5-5.6 and 3.5-2.5 thousand calendar years before present (cal ka BP). The respective weighted mean DeltaR values of these plateaus are 151 ± 85 and 89 ± 59 yrs, which are significantly higher than its modern value of -23 ± 52 yrs. This suggests that using a constant modern DeltaR value to calibrate 14C dates of the SCS marine samples will introduce additional errors to the calibrated ages. Our results provide the first database for the Holocene R and DeltaR values of the SCS for improved radiocarbon calibration of marine samples. We interpret the two DeltaR plateaus as being related to two intervals with weakened El Niño - Southern Oscillation (ENSO) and intensified East Asian summer monsoon (EASM). This is because the 14C content of the SCS surface water is controlled by both the 14C concentration of the Pacific North Equatorial Current (NEC) which is in turn influenced by ENSO-induced upwelling along the Pacific equator and vertical upwelling within the SCS as a result of moisture transportation to midlatitude region to supply the EASM rainfall.
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The aim of this paper was to accurately estimate the local truncation error of partial differential equations, that are numerically solved using a finite difference or finite volume approach on structured and unstructured meshes. In this work, we approximated the local truncation error using the @t-estimation procedure, which aims to compare the residuals on a sequence of grids with different spacing. First, we focused the analysis on one-dimensional scalar linear and non-linear test cases to examine the accuracy of the estimation of the truncation error for both finite difference and finite volume approaches on different grid topologies. Then, we extended the analysis to two-dimensional problems: first on linear and non-linear scalar equations and finally on the Euler equations. We demonstrated that this approach yields a highly accurate estimation of the truncation error if some conditions are fulfilled. These conditions are related to the accuracy of the restriction operators, the choice of the boundary conditions, the distortion of the grids and the magnitude of the iteration error.
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The stability analysis of open cavity flows is a problem of great interest in the aeronautical industry. This type of flow can appear, for example, in landing gears or auxiliary power unit configurations. Open cavity flows is very sensitive to any change in the configuration, either physical (incoming boundary layer, Reynolds or Mach numbers) or geometrical (length to depth and length to width ratio). In this work, we have focused on the effect of geometry and of the Reynolds number on the stability properties of a threedimensional spanwise periodic cavity flow in the incompressible limit. To that end, BiGlobal analysis is used to investigate the instabilities in this configuration. The basic flow is obtained by the numerical integration of the Navier-Stokes equations with laminar boundary layers imposed upstream. The 3D perturbation, assumed to be periodic in the spanwise direction, is obtained as the solution of the global eigenvalue problem. A parametric study has been performed, analyzing the stability of the flow under variation of the Reynolds number, the L/D ratio of the cavity, and the spanwise wavenumber β. For consistency, multidomain high order numerical schemes have been used in all the computations, either basic flow or eigenvalue problems. The results allow to define the neutral curves in the range of L/D = 1 to L/D = 3. A scaling relating the frequency of the eigenmodes and the length to depth ratio is provided, based on the analysis results.
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This contribution presents results of an incompressible two-dimensional flow over an open cavity of fixed aspect ratio (length/depth) L/D = 2 and the coupling between the three dimensional low frequency oscillation mode confined in the cavity and the wave-like disturbances evolving on the downstream wall of the cavity in the form of Tollmien-Schlichting waves. BiGlobal instability analysis is conducted to search the global disturbances superimposed upon a two-dimensional steady basic flow. The base solution is computed by the integration of the laminar Navier-Stokes equations in primitive variable formulation, while the eigenvalue problem (EVP) derived from the discretization of the linearized equations of motion in the BiGlobal framework is solved using an iterative procedure. The formulation of the BiGlobal EVP for the unbounded flow in the open cavity problem introduces additional difficulties regarding the flow-through boundaries. Local analysis has been utilized for the determination of the proper boundary conditions in the upper limit of the downstream region
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The Fractal Image Informatics toolbox (Oleschko et al., 2008 a; Torres-Argüelles et al., 2010) was applied to extract, classify and model the topological structure and dynamics of surface roughness in two highly eroded catchments of Mexico. Both areas are affected by gully erosion (Sidorchuk, 2005) and characterized by avalanche-like matter transport. Five contrasting morphological patterns were distinguished across the slope of the bare eroded surface of Faeozem (Queretaro State) while only one (apparently independent on the slope) roughness pattern was documented for Andosol (Michoacan State). We called these patterns ?the roughness clusters? and compared them in terms of metrizability, continuity, compactness, topological connectedness (global and local) and invariance, separability, and degree of ramification (Weyl, 1937). All mentioned topological measurands were correlated with the variance, skewness and kurtosis of the gray-level distribution of digital images. The morphology0 spatial dynamics of roughness clusters was measured and mapped with high precision in terms of fractal descriptors. The Hurst exponent was especially suitable to distinguish between the structure of ?turtle shell? and ?ramification? patterns (sediment producing zone A of the slope); as well as ?honeycomb? (sediment transport zone B) and ?dinosaur steps? and ?corals? (sediment deposition zone C) roughness clusters. Some other structural attributes of studied patterns were also statistically different and correlated with the variance, skewness and kurtosis of gray distribution of multiscale digital images. The scale invariance of classified roughness patterns was documented inside the range of five image resolutions. We conjectured that the geometrization of erosion patterns in terms of roughness clustering might benefit the most semi-quantitative models developed for erosion and sediment yield assessments (de Vente and Poesen, 2005).