La viabilidad de la construcción de un índice sintético de cohesión social para América Latina

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Hacia un núcleo de indicadores clave de cohesión social: un paso atrás, dos adelante

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Educaçãdo matemática na realidade do ciberespaço - Que aspectos ontológicos e científicos se apresentam?

The question that leads this article is What is this virtual space in the on-line mathematics education process? We focus on the question of the real and virtual as issues taken as components of cyberspace. We investigate these notions in the history of philosophy, looking to Granger to find their meaning, to enable us to understand them and fit them into the sphere of Mathematics Education. This theoretical-philosophical article, then, claims that the virtuality of cyberspace is supported by the computer screen, built by the unification of the sciences (mathematics), technology and its applications. Software and the actions taken by Internet users update the capability of these programs in a variety of characteristics and possibilities such as space-time flow interconnections as well as during the mathematics education process.

Social cohesion in Latin America: concepts, frames of reference and Indicators

Includes bibliography

Encuestas de hogares en América Latina: un panorama de los principales problemas

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América Latina y el Caribe: balance de pagos 1950-1984

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Experiencias y metodología de la investigación participativa

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Reunión de expertos sobre insumos sociodemográficos para la gestión y el desarrollo local

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Discurso en la reunión de expertos sobre insumos sociodemográficos para la gestión y el desarrollo local

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Bolivia: la experiencia del Instituto Nacional de Estadística en proyectos conjuntos con el UNFPA

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Experiencias del Fondo de Población de las Naciones Unidas (UNFPA) en la capacitación sobre población en Brasil

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Dinámica del suelo y estoque de carbono después de diez años de la restauración de tierras degradadas usando especies arbóreas del bosque atlántico

Brazil's Atlantic Forest ecosystem has been greatly affected by land use changes, with only 11.26% of its original vegetation cover remaining. Currently, Atlantic Forest restoration is receiving increasing attention because of its potential for carbon sequestration and the important role of soil carbon in the global carbon balance. Soil organic matter is also essential for physical, chemical and biological components of soil fertility and forest sustainability. This study evaluated the potential for soil recovery in contrasting restoration models using indigenous Atlantic Forest tree species ten years after their establishment. The study site is located in Botucatu municipality, São Paulo State-Brazil, in a loamy dystrophic Red-Yellow Argisol site (Typic Hapludult). Four treatments were compared: i) Control (Spontaneous Restoration); ii) Low Diversity (five fast-growing tree species established by direct seeding); iii) High Diversity (mixed plantings of 41 species established with seedlings) and; iv) Native Forest (well conserved neighboring forest fragment). The following soil properties were evaluated: (1) physical-texture, density and porosity; (2) chemical-C, N, P, S, K, Ca, Mg, Al and pH; (3) biological-microbial biomass. Litter nutrient concentrations (P, S, K, Ca and Mg) and C and N litter stocks were determined. Within ten years the litter C and N stocks of the Low Diversity treatment area were higher than Control and similar to those in both the High Diversity treatment and the Native Forest. Soil C stocks increased through time for both models and in the Control plots, but remained highest in the Native Forest. The methods of restoration were shown to have different effects on soil dynamics, mainly on chemical properties. These results show that, at least in the short-term, changes in soil properties are more rapid in a less complex system like the Low Diversity model than in the a High Species Diversity model. For both mixed plantation systems, carbon soil cycling can be reestablished, resulting in increases in carbon stocks in both soil and litter.

Migraciones internas: teoría, método y factores sociológicos

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Medición del empleo y de los ingresos rurales = Measurement of employment and income in rural areas

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Evolução tecnológica em uma firma de processo produtivo continuo no setor metal-mecânico brasileiro

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