Metrópolis de Colombia: aglomeraciones y desarrollo

Incluye Bibliografía

Variaciones en torno al escalafón de competitividad departamental en Colombia

Incluye Bibliografía

Contaminación atmosférica y conciencia ciudadana: el caso de la ciudad de Santiago

Incluye Bibliografía

Nuevas experiencias de concertación público-privada: las corporaciones para el desarrollo local: estudio de casos en las comunas de Santiago y Huechuraba, Area Metropolitana de Santiago de Chile

Incluye Bibliografía

El aporte del sector minero al desarrollo humano en Chile: el caso de la región de Antofagasta

Incluye Bibliografía

El cluster del ecoturismo en San Pedro

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Returning to an external debate: the terms of trade for commodities in the twentieth century

Includes bibliography

Peru: migracion, educacion y fecundidad en los estratos sociales bajos de Lima metropolitana

Incluye Bibliografía

Mobile application as a tool for urban traffic data collection and generation to advanced traveler information systems using Wi-Fi networks available in urban centers

This paper presents an Advanced Traveler Information System (ATIS) developed on Android platform, which is open source and free. The developed application has as its main objective the free use of a Vehicle-to- Infrastructure (V2I) communication through the wireless network access points available in urban centers. In addition to providing the necessary information for an Intelligent Transportation System (ITS) to a central server, the application also receives the traffic data close to the vehicle. Once obtained this traffic information, the application displays them to the driver in a clear and efficient way, allowing the user to make decisions about his route in real time. The application was tested in a real environment and the results are presented in the article. In conclusion we present the benefits of this application. © 2012 IEEE.

Educación popular en América Latina

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Las familias peruanas en el corto, mediano y largo plazo

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Los términos de intercambio de los productos básicos en el siglo XX

Incluye Bibliografía

The terms of trade for commodities in the twentieth century

Includes bibliography

Ausencia de futuro: la juventud colombiana

Incluye Bibliografía

Dielectric behavior of epoxy/BaTiO3 composites using nanostructured ceramic fibers obtained by electrospinning

Composite materials made of epoxy resin and barium titanate (BT) electrospun nanostructured fibers were prepared. BT fibers were synthesized from a sol based on barium acetate, titanium isopropoxide, and poly(vinyl pyrrolidone). The fibers were heat-treated at different temperatures and characterized by X-ray diffraction, scanning electron microscopy (SEM), and Raman spectroscopy. Mats of BT fibers heat-treated at 800 C were embedded in epoxy resin into suitable molds. The composites were characterized by SEM, and dielectric measurements were performed by means of dielectric spectroscopy. The dielectric permittivity and dielectric modulus of epoxy resin/BT-fiber composites were measured for two types of samples: with the electrodes parallel and perpendicular to the BT fiber layers. Interestingly, composite samples with electrodes perpendicular to the fiber layers and a BT content as low as 2 vol % led to dielectric permittivities three times higher than that of pure epoxy resin. © 2013 American Chemical Society.