Atomization
Mostrando 13-24 de 97 artigos, teses e dissertações.
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13. Espectrometria de Emissão Atômica em Filamento de Tungstênio (WCAES) : potencialidades e aplicações / Tungsten coil atomic emission spectrometry: potentialities and applications
This thesis describes the analytical application of WCAES for the determination of Ca, Al, Cs, Sr and Cr in samples with different compositions. In all studies the observation zone of the detector related to the coil was critically evaluated. In the first study, Ca was determined in mineral water, coconut water and juice samples. It was necessary the dilutio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/11/2012
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14. Estudo experimental de um resfriador evaporativo ciclônico / Experimental study of a cyclonic evaporative cooling
Este trabalho reporta os resultados obtidos na avaliação experimental de um ciclone de formato americano que foi modificado e adaptado para realizar a climatização de ambientes, através da técnica do resfriamento evaporativo. Para tal, o equipamento foi munido de bocais atomizadores, que realizam a injeção de líquido transversalmente à corrente de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2012
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15. Semi-quantitative model of the microstructure development in the high-alloyed iron based alloy during atomization
The paper deals with the analysis of microstructure formation in the tool steel of ledeburite type Ch12MF4 with the chemical composition of 2.37% C, 12.06% Cr, 1.2% Mo and 4.0 % V [wt. (%)] in the process of nitrogen gas atomization. Three main types of solidification microstructures were observed in rapidly solidified powder particles: dendritic, compound a
Mat. Res.. Publicado em: 31/05/2012
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16. Rapid solidification of an Al-5Ni alloy processed by spray forming
Recently, intermetallic compounds have attracted much attention due to their potential technological applications as high-temperature materials. In particular the intermetallic compounds, associated with the Al-Ni binary system stand out as promising candidates for high-temperature materials for the use in harsh environments. It is expected that a bulk Al-Ni
Mat. Res.. Publicado em: 08/05/2012
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17. Spray Forming of al Alloys: experiment and theory
Close coupled gas atomization has been studied. Pitot tube gas flow measurements support a postulate of transition from an initial sonic to a supersonic and a final sonic state along the convergence region of the jets. Predictions of the d50 median diameter utilizing a two phase model for primary and secondary break up correlate strongly with experimental re
Materials Research. Publicado em: 31/01/2012
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18. Antocianinas extraídas de capim-gordura (Melinis minutiflora): atividade antioxidante, microencapsulamento por atomização e estabilidade / Anthocyanin extracted of Molassesgrass (Melinis minutiflora): antioxidant activity, micro-encapsulation by atomization and stability
As antocianinas são pigmentos bastante instáveis, presente em vegetais como uva, amora, morango, jabuticaba, repolho roxo e outros. Apesar de existirem varias fontes, poucos vegetais se apresentam como fonte comercial, sendo assim, a busca de novas fontes, que apresentem um baixo custo, bem como formas de estabilizar este pigmento tem estimulado o desenvol
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2011
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19. Powder mombin (Spondias mombin L.) atomized: Physical, physicochemical and sensory evaluation of the hygroscopic behavior / Pà de cajà (Spondia mombin l.) atomizado: caracterizaÃÃo fÃsicas, fÃsico-quÃmicas, sensoriais e avaliaÃÃo do comportamento higroscÃpico
The hog plum is a fruit that has good physical-chemical and sensory properties, which give it great acceptance by consumers and industry, and presents excellent nutritional quality. It has sugars, vitamin A and C. In this context, this study aimed to apply the process of atomization in hog plum pulp, using two experimental designs, analyzing the process vari
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/2011
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20. Caracterização físico-química e reológica de iogurtes elaborados com diferentes substitutos de gordura / Study of rheological characteristics in light yogurt using different fat replacers
Whey protein concentrated (WPC), inulin and micellar casein (MC) are used in many products due to their technological and functional properties. Skimmed yogurt show fragile consistency and syneresis, wich is a common defect in this kind of products. An advantage of WPC and inulin is their capacity to act like fat replacers. The present research aimed to eval
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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21. Determinación simultánea de Cr, Ni y V en orina mediante et aas
A procedure for the simultaneous determination of Cr, Ni, and V in urine by electrothermal atomic absorption spectrometry (ET AAS) was optimized by factorial design, and performed at a pyrolysis and atomization temperatures of 1300 and 2500 ºC, respectively, using 15 µg de Mg(NO3)2 as chemical modifier. Characteristics mass of 14, 6 and 220 ρg and detecti
Química Nova. Publicado em: 2011
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22. Determinação de Cu e Fe em Biodiesel por Espectrometria de Absorção Atômica com Atomização Eletrotérmica e Estudo do Efeito Catalítico destes Metais sobre a Estabilidade Oxidativa do Biodiesel / Determination of Cu and Fe in Biodiesel by Absorption Spectrometry Electrothermal atomic and Study of the Effect of Catalytic Metals on the Oxidative Stability of Biodiesel
The metals content in biodiesel is directly related with the raw material used and also with the utilized biodiesel production method. In this work, an evaluation of the main metals present in biodiesel samples from different sources was done. The qualitative analysis of the metal content was assessed using the Inductively Coupled Plasma Mass Spectrometry te
Publicado em: 2011
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23. Bovine liver sample preparation and micro-homogeneity study for Cu and Zn determination by solid sampling electrothermal atomic absorption spectrometry.
Abstract This work describes a systematic study for the bovine liver sample preparation for Cu and Zn determination by solid sampling electrothermal atomic absorption spectrometry. The main parameters investigated were sample drying, grinding process, particle size, sample size, microsample homogeneity, and their relationship with the precision and accuracy
Spectrochimica Acta Part B v. 60. Publicado em: 2011
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24. DETERMINAÇÃO DAS CONSTANTES DE ESTABILIDADE DOS COMPLEXOS FORMADOS ENTRE OS AMINOÁCIDOS CISTEÍNA, N-ACETILCISTEÍNA E LISINA COM CHUMBO EM SOLUÇÃO AQUOSA / DETERMINATION OF STABILITY CONSTANTS FOR LEAD COMPLEXES WITH CYSTEINE, N-ACETYLCYSTEINE AND LYSINE IN AQUEOUS SOLUTIONS
In this study we investigated the interaction between lead and the amino acid cysteine, lysine and N-acetylcysteine by testing long-term contact with ion exchanger resins and also the determination of stability constants. The importance of investigating the presence of lead in solutions for parenteral nutrition is related to the risk of internal contaminatio
Publicado em: 2011