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Wideband low-distortion delta-sigma ADC topology
A /spl Delta//spl Sigma/ topology with reduced sensitivity to opamp nonlinearities is described. The technique is effective even for very low oversampling ratios, and can be used for any modulationExpand
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Determination of Ag, Pb and Sn in aqua regia extracts from sediments by electrothermal atomic absorption spectrometry using Ru as a permanent modifier
Ruthenium, deposited on a L’vov platform, is proposed as a permanent modifier for the determination of Ag, Pb and Sn in aqua regia extracts from sediments by electrothermal atomic absorptionExpand
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Iridium and rhodium as permanent chemical modifiers for the determination of Ag, As, Bi, Cd, and Sb by electrothermal atomic absorption spectrometry
Abstract Performance of graphite platforms coated with Ir, Rh, and a mixture of both, as permanent modifiers for Ag, As, Bi, Cd, and Sb, was evaluated. The coating process is very simple: a solutionExpand
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Multivariate optimization by exploratory analysis applied to the determination of microelements in fruit juice by inductively coupled plasma optical emission spectrometry
Abstract A method for the direct determination (without sample pre-digestion) of microelements in fruit juice by inductively coupled plasma optical emission spectrometry has been developed. TheExpand
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Genesis of the Ibero-Armorican arc
AbstractThe Ibero-Armorican arc is continuous between Iberia and Armorica; its curvature increased with time due to subduction followed by continental collision; indentation produced left lateralExpand
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Comparative study of conventional and multivariate methods for aluminum determination in soft drinks by graphite furnace atomic absorption spectrometry
Abstract In the present study, conventional and multivariate methods were used to optimize conditions for direct determination of aluminum in soft drinks by electrothermal atomic absorptionExpand
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High-Performance Delta-Sigma Analog-to-Digital Converters
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Direct determination of lead in human urine and serum samples by electrothermal atomic absorption spectrometry and permanent modifiers
The object of the present study was the development of alternative methods for the direct determination of lead in undigested samples of human urine and serum by electrothermal atomic absorptionExpand
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Caracterização de propriedades funcionais do isolado protéico de sementes de algaroba (Prosopis juliflora(SW) D.C.). modificado por acetilação
O isolado proteico das sementes de algaroba (Prosopis juliflora (SW) D.C.) foi modificado com anidrido acetico nas concentracoes de 5, 10, 20 e 30% (V/P), resultando, portanto, nos respectivos grausExpand
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Determination of As, Cd, Pb and Se in DORM-1 dogfish muscle reference material using alkaline solubilization and electrothermal atomic absorption spectrometry with Ir+Rh as permanent modifiers or
Abstract In this work, tetramethylammonium hydroxide (TMAH) was used to solubilize the DORM-1 dogfish muscle certified reference material as a model substance for the determination of As, Cd, Pb andExpand
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