Pequeñas y medianas empresas industriales y política tecnológica: el caso mexicano de las tres últimas décadas

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Las PYME y los sistemas de apoyo a la innovación tecnológica en Chile

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Intensidad tecnológica del comercio latinoamericano de manufacturas

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Del monopolio de Estado a la convergencia tecnológica: evolución y retos de la regulación de telecomunicaciones en América Latina

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Diseño de políticas para el fortalecimiento de la capacidad de innovación tecnológica y elevación de la competitividad internacional en el ambiente empresarial latinoamericano

Resumen de las deliberaciones generales de una reunión de alto nivel, celebrada en la CEPAL, 25-26 de enero de 1989, para discutir los criterios estratégicos de un programa de asistencia técnica a los gobiernos de la región.

Cadenas productivas, innovación tecnológica y empleo

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Geologia e Caracterização Tecnológica do Minério de Manganês da Mina Córrego do Cocho, Itapira (SP)

The objects of this study are three manganese ore deposits and one mine derived from lateritic weathering of gondites (spessartine quartzites). These deposits are associated with Mn-rich garnet metasediments of the Itapira Group (Paleoproterozoic) and the reserves were estimated at approximately 2.0 × 10 6 tons with an average grade of 23% MnO 2. The ore minerals are cryptomelane, pyrolusite, lithiophorite, spessartine and psilomelane. Several crystal shapes and textural characteristics were identifi ed in this study, which are related to the degree of liberation, as confi rmed by heavy media separation method. In this study, we determined the main characteristics of the liberation of manganese, which is concentrated in the fi ne grain-size fraction and is lost during ore dressing. Therefore, the low average content of MnO 2 (28%) is due to this loss, whereas at grain size of minus 0.074 mm, contents near 40% MnO 2 were observed. This suggests that the ore can be used for manufacturing manganese sulphate fertilizers. A comparative study with the ore deposits located at Ouro Fino (MG), mainly with the Caneleiras mine, showed that higher degree of liberation occurs in the coarse grain-size fractions (0.84 to 0.074 mm with MnO 2 content of 38%). As a consequence, the ore can be used for manufacturing Fe-Si-Mn alloys.

Investigação tecnológica de arenitos silicificados da Formação Botucatu (ne do Paraná) para uso como rocha de revestimento

For many years the silicified sandstone associated of the Botucatu Formation has been the target of interest to researchers and miners, either for understanding the genesis of silicification or for your use as dimension stone and covering on the building industry. If in the first there are several articles available in the geological literature the second there are only technical data marketing available. In the northeast portion of the Paraná State and southwest of the São Paulo State these rocks are mined and traded as covering stones. Not much is known about their intrinsic characteristics and technological properties. To improve the knowledge of the technological behavior of these materials, samples from a quarry from Ribeirao Claro region were petrographically and physically characterized according to the standards established by the Brazilian Association of Technical Standards to dimension stones. Therefore, two bulk samples of silicified sandstone of the Ribeirão Claro/PR region were studied and characterized following the norms established by Brazilian Association of Technical Standards for dimension stones. The results obtained in the petrographical and technological studies are presented and indicated that, in general, the technological performance presented by sandstone studied induces limitations of use as covering materials, mainly horizontally as pavements, door stone and step ladder.

El Proyecto Futuros del Instituto de Prospectiva Tecnológica (IPTS) de la Comisión Europea, Sevilla, España

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Evolução tecnológica no setor de máquinas de processar cereais: um estudo de caso

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Inovação tecnológica no setor de máquinas ferramentas brasileiro: um estudo de caso

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Observações sobre a mudança tecnológica no setor de máquinas ferramentas do Brasil

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