Estudio de suministro de gas natural desde Venezuela y Colombia a Costa Rica y Panamá

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Coherencia de las políticas públicas y su traducción en esquemas regulatorios consistentes: caso del diesel oil en Chile

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Desarrollo de infraestructura y crecimiento económico: revisión conceptual

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Reformas e inversión en la industria de hidrocarburos de América Latina

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La industria del gas natural en América del Sur: situación y posibilidades de la integración de mercados

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Variabilidade temporal no transporte de sedimentos no rio Ivaí - Paraná (1977-2007)

This paper evaluates the behavior of suspended sediment load of the river Ivaí over a period of 32 years measured by the station further downstream the river (Novo Porto Taquara). The most suitable parameters for this assessment were the annual discharge of suspended sediment and water obtained from SUDERSA. The relationship between the concentration of suspended sediment and discharge of water had not a very good correlation (R 2 = 0,56) and hysteresis effect is quite clear. The justification for this behavior is given by the heterogeneity of the hydrological regime and basin occupation. There were no significant changes in annual flows which have remained the same during the study period. Already the discharge of suspended sediment showed a small gradual decline in which the end of the period (2007), the river carries less than 0.65 Mton at the beginning (1977). This reduction in suspended sediment transported is probably due to changes in soil management for agriculture.

Estimativa de alguns parâmetros de transporte de contaminantes para solos Brasileiros

This paper introduces an indirect estimate for the coefficients of distribution, hydrodynamic dispersion and retardation for contaminants commonly encountered in sanitary landfills and their liners, such as Cu2+ and K+; this estimate is based on the relationship between concentration and certain physical characteristics of typical Brazilian soils. The results of previous studies investigating the migration of contaminants were used to develop mathematical expressions from multiple non-linear regressions. Using minimal squares regression, this transport was linked to various combinations of contaminant concentration and both structural and textural characteristics of the porous medium. Various combinations of characteristics and concentrations were investigated, with a mathematical expression obtained for each. The relationship between percentage of clay and the contaminant content proved to be the most closely correlated with actual transport parameters, with coefficients close to one.

Chile: las reformas estructurales y la inversión privada en áreas de infraestructura

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Determinantes de la inversión en el sector petróleo y gas en la Argentina

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Algunos determinantes de la inversión en sectores de infraestructura en la Argentina

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Impacto de la reforma económica sobre las inversiones de la industria eléctrica en México: el regreso del capital privado como palanca de desarrollo

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Las carreteras y el sistema portuario frente a las reformas económicas en México

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