994 resultados para Taxa de Retorno Aparente


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Patologia - FMB

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Incluye bibliografía.

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This research aimed to evaluate the wood and charcoal quality of hybrids clone of the crossing C. citriodora with C. torelliana in two different locations for charcoal production. Seven with 3,75 years old clones, planted at country of Itamarandiba – MG, and six 6,42 years old clones, planted in Dionísio – MG, were studied. For wood and charcoal quality analysis, samples were collected along the stem of the trees until the commercial height. Properties study of the wood was done by chemical analysis, basic density, superior heat power, and thermogravimetric analysis. The wood samples were carbonized in laboratory conditions with heating rate of 1.67 0 C.min -1 , starting at 100 0 C until 450 0 C and keeping on this temperature for 30 minutes. It were determined the carbonizations gravimetric yield, all in dry basis. The wood quality was evaluated based on the chemical immediate analysis, relative apparent density, and gross heating value. The experiment was installed according to the completely randomized design, with five repetitions. The collected data were submitted to analysis of variance and, when the evaluated effects were significant by “F” test, was applied the Scott-Knott test at 5% probability for multiple comparisons. For correlation analysis, Pearson correlation coefficient, tested by the "t" test at 5% probability was used. Results showed variability of wood between the genetic materials evaluated in relation to place and plant crossing. The thermal analysis of the wood showed significant variation between clones and it was possible to differentiate two stages of degradation (hemicelluloses and cellulose). The majority of the clones presented satisfactory properties for the charcoal production, while, clone 3, planted in Itamarandiba, obtained the best performance due it have the higher yield and energetic efficiency, thus, achieving the best potential for charcoal production. However, clone 9, planted in Dionísio, was the less indicated for charcoal production since it presented the lowest energetic efficiency, gravimetric yield, and densities.

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En este artículo se aborda un estudio de la dimensión demográfica de la emigración exterior, el retorno al país de nacimiento y la reemigración de latinoamericanos desde España durante el período 2002-2012. El trabajo se realiza a partir de fuentes de registro en España y de datos en los países de destino correspondientes a la ronda censal de 2010. A ello se añade una descripción de los programas oficiales de ayuda al retorno llevados a cabo en España y algunos países latinoamericanos. La complementariedad de la información que proporcionan estos tres tipos de fuentes nos ha permitido evaluar directamente el retorno al país de nacimiento, un fenómeno en crecimiento a raíz de la agudización de la crisis económica en España, cuya intensidad no es uniforme entre todos los grupos de inmigrantes latinoamericanos. También se ha contemplado una estimación indirecta de la emigración a terceros países. Esta forma de movilidad internacional es una respuesta de los inmigrantes latinoamericanos que, tras haber conseguido un estatus legal en España, pueden moverse prácticamente sin restricciones en otros mercados de trabajo de países europeos que no han padecido una crisis financiera tan fuerte. La reflexión sobre la incidencia de las fuentes españolas en la medición de la emigración exterior, la estimación de la intensidad y estructura demográfica de las diferentes formas de salida de España, así como la distribución geográfica de estos movimientos según el país de nacimiento constituyen los objetos de estudio que abordaremos en este trabajo.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)