La actualidad de viejas temáticas: sobre los estudios de clase, estratificación y movilidad social en América Latina

Incluye Bibliografía

Una interpretación histórica de la población. Apuntes de clase; versión preliminar

Documento disponible en otra versión (3050.00 y 7012.05)

Perú: la educación preescolar y primaria. Estimación de la matrícula escolar, necesidades de maestros y aulas de clase, 1970-1985; rendimiento del sistema educativo

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Mortalidad I; apuntes de clase 1979

Incluye Bibliografía

Las desigualdades de clase en el comportamiento reproductivo en el Brasil: democratización incompleta y paradojas de la fecundidad juvenil

En este artículo se examina cómo fue el proceso de descenso de la fecundidad en las diferentes clases sociales en el Brasil, reflexionando sobre cuándo, cómo y en qué sentido se producen los cambios del lugar que ocupa la maternidad en la vida de las mujeres de diferentes estratos sociales. El análisis de clases se emplea para investigar diferenciales en las tasas de fecundidad, el tiempo de entrada en la maternidad, y la incidencia y efectos de la maternidad temprana. Se observa que existen desafíos propios de una democratización incompleta en cuanto al acceso a la anticoncepción y, teniendo en cuenta la evolución de los derechos a la salud sexual y reproductiva en el Brasil, se concluye exponiendo algunas reflexiones sobre los retos para su efectiva implementación.

Manganita de lantânio dopada com estrôncio obtida por coprecipitação homogênea: magnetorresistência e magnetorrefletividade

Pós-graduação em Química - IQ

Interpretação aeromagnética automática com uso da equação homogênea de Euler e sua aplicação na Bacia do Solimões

ABSTRACT: We present here a methodology for the rapid interpretation of aeromagnetic data in three dimensions. An estimation of the x, y and z coordinates of prismatic elements is obtained through the application of "Euler's Homogeneous equation" to the data. In this application, it is necessary to have only the total magnetic field and its derivatives. These components can be measured or calculated from the total field data. In the use of Euler's Homogeneous equation, the structural index, the coordinates of the corners of the prism and the depth to the top of the prism are unknown vectors. Inversion of the data by classical least-squares methods renders the problem ill-conditioned. However, the inverse problem can be stabilized by the introduction of both a priori information within the parameter vector together with a weighting matrix. The algorithm was tested with synthetic and real data in a low magnetic latitude region and the results were satisfactory. The applicability of the theorem and its ambiguity caused by the lack of information about the direction of total magnetization, inherent in all automatic methods, is also discussed. As an application, an area within the Solimões basin was chosen to test the method. Since 1977, the Solimões basin has become a center of exploration activity, motivated by the first discovery of gas bearing sandstones within the Monte Alegre formation. Since then, seismic investigations and drilling have been carried on in the region. A knowledge of basement structures is of great importance in the location of oil traps and understanding the tectonic history of this region. Through the application of this method a preliminary estimate of the areal distribution and depth of interbasement and sedimentary magnetic sources was obtained.

Estudo da contribuição do espalhamento nuclear não elástico de prótons na dose depositada em alvos com composição homogênea

Due the differences between interaction physics process with matter for protons and photons, the proton beam tomography (pCT) has some vantages to comparison with conventional tomography. Also it is confirmed that usually pCT has better dose distribution and highest contrast resolution. The pCT allow not only view the internal structure of an object without destroying it, but also directly measure of volume density of electrons. Also it is confirmed that usually pCT has better dose distribution and highest contrast resolution. At the same time, there are many scientific and technical aspects to a detailed study: the capacity and limitations of the pCT methods are not well clarified. Through computations, based on Monte Carlo Method was carried out a detailed study of the contribution of non-elastic nuclear spreading, and together was compared with an analytical model for the deflection angle and the lateral deflection of protons in the target volume. The programs used were SRIM 2006 code and MCNPX v.2.50 code