Política de crescimento e o futuro do Brasil

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Estados Unidos: empresas transnacionales (ET) y tecnologías de información (TI)

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Tendencias del empleo y la productividad manufacturera en América Latina

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Intensidad tecnológica del comercio latinoamericano de manufacturas

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Transformación productiva, competitividad y progreso técnico: países desarrollados

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Perspectivas de América Latina en el nuevo contexto internacional de 2001

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Tasa de crecimiento nula para los países en vías de desarrollo en el año 2000: ¿sueño o realidad?

Documento disponible en otra versión (3368.00, 1554.01 y 3398.01)

Development of a support vector machine-based navigation system for driving a mobile robot through paths in plantations

The use of mobile robots turns out to be interesting in activities where the action of human specialist is difficult or dangerous. Mobile robots are often used for the exploration in areas of difficult access, such as rescue operations and space missions, to avoid human experts exposition to risky situations. Mobile robots are also used in agriculture for planting tasks as well as for keeping the application of pesticides within minimal amounts to mitigate environmental pollution. In this paper we present the development of a system to control the navigation of an autonomous mobile robot through tracks in plantations. Track images are used to control robot direction by preprocessing them to extract image features. Such features are then submitted to a support vector machine in order to find out the most appropriate route. The overall goal of the project to which this work is connected is to develop a real time robot control system to be embedded into a hardware platform. In this paper we report the software implementation of a support vector machine, which so far presented around 93% accuracy in predicting the appropriate route. © 2012 IEEE.

Photodetection with gate-controlled lateral BJTs from standard CMOS technology

The silicon-based gate-controlled lateral bipolar junction transistor (BJT) is a controllable four-terminal photodetector with very high responsivity at low-light intensities. It is a hybrid device composed of a MOSFET, a lateral BJT, and a vertical BJT. Using sufficient gate bias to operate the MOS transistor in inversion mode, the photodetector allows for increasing the photocurrent gain by 106 at low light intensities when the base-emitter voltage is smaller than 0.4 V, and BJT is off. Two operation modes, with constant voltage bias between gate and emitter/source terminals and between gate and base/body terminals, allow for tuning the photoresponse from sublinear to slightly above linear, satisfying the application requirements for wide dynamic range, high-contrast, or linear imaging. MOSFETs from a standard 0.18-μm triple-well complementary-metal oxide semiconductor technology with a width to length ratio of 8 μm /2 μm and a total area of ∼ 500μm2 are used. When using this area, the responsivities are 16-20 kA/W. © 2001-2012 IEEE.

Informe de actividades del Centro Latinoamericano de Demografía (CELADE), 1986-1987 = Report of the activities of the Latin American Demographic Centre (CELADE), 1986-1987

Presenta las actividades agrupadas en tres áreas de trabajo o subprogramas: integración de la población en el desarrollo socioeconómico, información sobre población y su tecnología, y enseñanza y capacitación. En anexo, con cuadros, ofrece un detalle de las misiones de cooperación técnica a los países de la región, los cursos de capacitación y las publicaciones correspondientes al bienio.

The correlation between electronic structure and antimalarial activity of alkoxylated and hydroxylated chalcones

Chalcones have shown potential to several pharmacological applications including antimalarial properties. We employed multivariate data analysis to correlate the antimalarial activity with electronic structure descriptors obtained through quantum mechanical calculations. The results show high statistical significance and bring valuable insights in order to design new compounds. © 2013 Springer Science+Business Media New York.

Avaliação clínico-laboratorial de cães com doença renal crônica sob tratamento com o antioxidante N-acetilcisteína

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)