Impurity
Mostrando 1-12 de 181 artigos, teses e dissertações.
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1. Sedimentation and rheological behavior of reactive and non-reactive magnesium hydroxide pulps for industrial spray dryer processing
Abstract Two different reactive concentrated magnesium hydroxide (HM) pulps, produced in a lab reactor mill, and a synthetic and non-reactive HM-pulp, for comparative analyses, have been prepared and studied. Sodium polyacrylate was selected as a dispersant for improving the HM pulp fluidity, with concentrations varying from 0.42% to 2.0% on a dry basis. The
Cerâmica. Publicado em: 2023
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2. Thermostimulated crystal structure transformation of the polymineral clay submicron particles
Abstract Changes in the structure of phyllosilicate microparticles of submicron fractions of polymineral clay with an average size of 290 nm, as well as changes in the positions of impurity ions of transition metals in the crystal lattice, were studied by X-ray diffraction analysis, Fourier transform infrared spectroscopy, and high-resolution electron parama
Cerâmica. Publicado em: 2022
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3. 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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4. STATIC PRESSURE DROP IN LAYERS OF CASTOR BEAN GRAINS
ABSTRACT Knowledge regarding the static pressure drop in granular layers is of fundamental importance in the development of efficient drying and aeration projects of agricultural products. Thus, the objective of this study was to evaluate the effects of impurity contents on the static pressure drop in different bed depth of castor bean grains, as well as mod
Eng. Agríc.. Publicado em: 2020-04
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5. Influence of Yttria-Stabilized Zirconia on Microstructure and Electrical Properties of Doped Lanthanum Gallate
Lanthanum gallate with partial substitutions for strontium and magnesium shows higher ionic conductivity than traditional ionic conductors such as yttria-stabilized zirconia (8YSZ), and has been considered for application as solid electrolyte and electrode in Solid Oxide Fuel Cells operating at intermediate temperatures (500-700ºC). Parallel to the developm
Mat. Res.. Publicado em: 01/08/2019
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6. Characterization and in silico Mutagenic Assessment of a New Betahistine Degradation Impurity
Currently, the pharmaceutical industry devotes great attention to drug degradation products because these compounds can offer risks to patients. A previous degradation study of betahistine (N-α-methyl-2-pyridylethylamine) conducted under different stress conditions detected three main impurities named A, B and C. Degradation products were analyzed by high-r
J. Braz. Chem. Soc.. Publicado em: 04/07/2019
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7. Comparison of equipment for grain sampling
RESUMO A amostragem de grãos requer a utilização de equipamentos adequados e precisos. Assim, objetivou-se comparar caladores (amostradores) de grãos, manual e mecânico, utilizados na amostragem de cargas de soja durante o recebimento em unidades armazenadoras. Os equipamentos utilizados foram os caladores manuais de 1,80 m e três estágios de abertura
Rev. bras. eng. agríc. ambient.. Publicado em: 2019-03
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8. Juno, a mulher transparente de Dresden. A história de um modelo anatômico feminino
Resumo: A ‘mulher de transparente de Dresden’ é um modelo anatômico feminino, criado pelo Deutsches Hygiene-Museum de Dresden (1936). Modelo didático científico, feito de plástico cellon; ícone do movimento eugenista; criado como metáfora da superação da corporeidade associada à impureza; metáfora da organização social do trabalho; resultado
Rev. Bras. Hist. Educ.. Publicado em: 14/01/2019
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9. Ga Dopant Induced Band Gap Broadening and Conductivity Enhancement in Spray Pyrolysed Zn0.85Ca0.15O thin Films
Ga doped Zn0.85Ca0.15O thin films were prepared by spray pyrolysis method and studied the impact of Ga doping concentration on the physical properties of these films. XRD analysis confirmed the structural purity and polycrystalline nature of the films and composition analysis verified the incorporation of dopants in the structures. Optical transmission in th
Mat. Res.. Publicado em: 03/09/2018
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10. Use of SnOx:F in the Recycling of Silicon Solar Cells
Amongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric con
Mat. Res.. Publicado em: 22/01/2018
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11. Influence of Nanoxides on Diffusivity and Solubility of Hydrogen in Pd-based alloys
The hydrogen interaction in palladium alloys with addition of Ce, Zr and Y was studied. These alloys are produced by arc-melting and then cold rolled into thin foils. Heat treatment at 800ºC for 24h in air atmosphere is applied to induce internal oxidation. Hydrogen permeation tests and TDS (Thermal Desorption Spectroscopy) are carried out to evaluate hydro
Mat. Res.. Publicado em: 11/01/2018
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12. Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method
Sol-gel modified Pechini's method was used to prepare WO3 nanopowders using dicarboxylic acid and polyethylene glycol as the chelating agent and polymeric source, respectively. WO3 powders were first prepared by calcination of resin precursor at 550ºC under various initial concentrations of metal ion (12.5-50 mmol), acid (125-500 mmol), a complexing agent (
Mat. Res.. Publicado em: 28/09/2017