937 resultados para Metales pesados


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The continuous advance of the Brazilian economy and increased competition in the heavy equipment market, increasingly point to the need for accurate sales forecasting processes, which allow an optimized strategic planning and therefore better overall results. In this manner, we found that the sales forecasting process deserves to be studied and understood, since it has a key role in corporate strategic planning. Accurate forecasting methods enable direction of companies to circumvent the management difficulties and the variations of finished goods inventory, which make companies more competitive. By analyzing the stages of the sales forecasting it was possible to observe that this process is methodical, bureaucratic and demands a lot of training for their managers and professionals. In this paper we applied the modeling method and the selecting process which has been done for Armstrong to select the most appropriate technique for two products of a heavy equipment industry and it has been through this method that the triple exponential smoothing technique has been chosen for both products. The results obtained by prediction with the triple exponential smoothing technique were better than forecasts prepared by the industry experts

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A contaminação do solo pelo descarte de substâncias tóxicas adquiriu, nos últimos anos, maior atenção da comunidade científica a qual tem alertado a população dos países, em geral, para as conseqüências, em especial, as patologias que podem ocorrer quando estas substâncias adentram nossa cadeia alimentar. Neste trabalho procurou-se apresentar as fontes de contaminação e a toxicidade do cádmio, do chumbo, do mercúrio e do manganês, quando estes se encontram em níveis elevados no solo e nos mananciais superficiais e subterrâneos. Com relação aos três primeiros metais, sua alta dosagem pode provocar, no ser humano, diversos tipos de câncer, lesões no estômago e pulmões, além de alterações importantes nos sistemas imunológico e nervoso central. O manganês, um dos metais mais comuns da crosta terrestre, largamente utilizado pela indústria e disponibilizado, em grandes quantidades no meio ambiente, em doses elevadas pode causar doenças pulmonares e neurológicas.

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Pós-graduação em Zootecnia - FCAV

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Pós-graduação em Zootecnia - FCAV

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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

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Silver containing heavy metal oxide glasses and glass ceramics of the system WO3-SbPO4-PbO-AgCl with different AgCl contents have been prepared and their thermal, structural and optical properties characterized. Glass ceramics containing metallic silver nanoparticles have been prepared by annealing glass samples at temperatures above the glass transition and analyzed by transmission electron microscopy and energy dispersive X-ray microanalysis. The presence of the metallic clusters has been also confirmed by the observation of a surface plasmon resonimce band in the visible range. Cyclic voltammetric measurements indicated the presence of metallic silver into the glasses, even before to perform the thermal treatment.

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[ES] Las entradas de aerosoles procedentes del Continente Africano tienen un importante efecto en el clima y biogeoquímica marina de la Región Canaria. Por tal motivo, se estudiaron los factores que influyen en las concentraciones de partículas en el aire (PTS), la composición química de estas partículas y los flujos de deposición de los metales solubles (Al, Fe, Mn, Co, Ti y Cu). Para ello se tomaron muestras en tres estaciones de la Isla de Gran Canaria (Taliarte al nivel del mar, Tafira at 269 m altitud and Pico de la Gorra 1930 m altitud) desde el 2002. Utilizando las medidas de deposición seca y húmeda se puede estimar una deposición total anual para la Cuenca de Canarias de 1,36 millones de t año-1. Conociendo por tanto los valores de la composición química y la solubilidad de los elementos, podemos estimar los flujos de deposición de estos elementos solubles.

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[EN]African dust pulses have important effects on the climate and marine biogeochemistry of the Canary Region. Common factors influencing the air mass concentration, elemental and composition of aerosol particles and atmospheric deposition fluxes of soluble Fe, Al, Mn, Ti, Cu and Co were examined. Aerosol samples have been collected at three stations in Gran Canaria Island (Taliarte at sea level, Tafira at 269 m altitude and Pico de la Gorra 1930 m altitude) since 2002. Air-mass back trajectories (HySPLIT, NOAA) suggested that the Sahara desert is the major sources of dust (dominant during 32-50% of days) while the Sahel desert was the major source only 2-10% of the time (maximum in summerautumn).

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