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Mostrando 13-24 de 4309 artigos, teses e dissertações.
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13. Production of paste from fine tailings streams in a laboratory scale column thickener
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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14. Not even Freud explains this!
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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15. HPLC METHOD IMPROVEMENT FOR 4-NONYLPHENOL DETERMINATION IN ANAEROBIC REACTORS: DECREASING SOLVENT CONSUMPTION AND WASTE GENERATION
The aim of this study was to develop a chromatographic method for 4-NP determination in anaerobic batch reactors using low amount of organic solvents and also evaluate 4-NP degradation in the presence of different co-substrates. Chromatographic parameters was improved for stationary phase (C-8 column), mobile phase (acetonitrile/water solution 90:10, v:v), c
Quím. Nova. Publicado em: 2020-09
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16. De la «sujétion», ou Crise de la sémiotique
Abstract Can semiotics theorise subjectivity? Since all communicated signs are framed by enunciation, inter-subjectivity is presupposed in semiosis, because it structures its deictic relations; but can subjectivity as such — which is a matter of cognitive psychology and phenomenology, both existential and formal — still be considered as an entity pertain
Galáxia (São Paulo). Publicado em: 2020-08
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17. ROBERTO ATTILIO LIMA SANTIN: Os sons de uma bela história
Abstract Can semiotics theorise subjectivity? Since all communicated signs are framed by enunciation, inter-subjectivity is presupposed in semiosis, because it structures its deictic relations; but can subjectivity as such — which is a matter of cognitive psychology and phenomenology, both existential and formal — still be considered as an entity pertain
Rev. bras. ortop.. Publicado em: 2020-08
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18. Calímaco. Epigramas de Calímaco. Tradução, introdução e notas de Guilherme Gontijo Fores; revisão de tradução João Angelo Oliva Neto. Belo Horizonte: Autêntica Editora, 2019, 176 p.
Abstract Can semiotics theorise subjectivity? Since all communicated signs are framed by enunciation, inter-subjectivity is presupposed in semiosis, because it structures its deictic relations; but can subjectivity as such — which is a matter of cognitive psychology and phenomenology, both existential and formal — still be considered as an entity pertain
Cad. Trad.. Publicado em: 2020-08
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19. Tratamento Medicamentoso da Hipertensão: Do Trio de Ouro ao Octeto
Abstract Can semiotics theorise subjectivity? Since all communicated signs are framed by enunciation, inter-subjectivity is presupposed in semiosis, because it structures its deictic relations; but can subjectivity as such — which is a matter of cognitive psychology and phenomenology, both existential and formal — still be considered as an entity pertain
Arq. Bras. Cardiol.. Publicado em: 2020-08
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20. Effects of addition of engineered ZnO nanoparticles on the stability of colloidal suspensions containing TiO2 interacting with sandy soil
Abstract The stability of colloidal suspensions of engineered nanoparticles in the environment is of great interest for the risk assessment and treatment of hazardous materials. The relevance of this study is due to the evidence that engineered nanoparticles have been produced and used in commercial products in large scale, especially ZnO and TiO2, which are
REM, Int. Eng. J.. Publicado em: 2020-06
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21. Methodology Development and Validation of Amphotericin B Stability by HPLC-DAD
The high worldwide consumption of antibiotics and their complex impurity profiles has drawn the attention of the scientific community to the development and validation of stability methods for these drugs. Amphotericin B is an antibiotic that is a natural fermentation product of bacterium Streptomyces nodosus, used as a broad-spectrum antifungal agent, and i
J. Braz. Chem. Soc.. Publicado em: 2020-05
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22. Determination of Methanol in Gasoline and Ethanol Fuels by High-Performance Liquid Chromatography
Gasoline and ethanol fuels have been adulterated with methanol in Brazil. Methanol is not permitted in concentrations greater than 0.5 vol% due its toxicity but its lower price stimulates the adulteration. A new approach for quantitative analysis of methanol in gasoline and ethanol fuels is reported employing high-performance liquid chromatography coupled wi
J. Braz. Chem. Soc.. Publicado em: 2020-05
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23. Determinação de docetaxel e metabólitos em plasma por UPLC-MS/MS: desenvolvimento de metodologia analítica e aplicação clínica
A highly sensitive ultra-performance liquid chromatography tandem mass spectrometry method for the determination of Docetaxel and metabolites (M1+M3) in human plasma samples was developed and validated. The method employs a liquid-liquid extraction and a reversed phase separation Acquity® C18 column BEH C18 (150 x 2.1 mm, 1.7 µm). Mobile phase was a mixtur
Quím. Nova. Publicado em: 2020-04
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24. AVALIAÇÃO DE ADITIVOS DE FASE MÓVEL E TEMPERATURA NA VIDA ÚTIL DE COLUNAS PARA CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA
Buffered solutions, additives, and column temperature are widely used in high-performance liquid chromatography to promote adequate retention of compounds and to improve the chromatographic separation. However, these factors can dramatically reduce the column lifetime. In this work, the effect of column temperature, pH and the salt type and concentration in
Quím. Nova. Publicado em: 2020-03