Entrainment
Mostrando 1-12 de 116 artigos, teses e dissertações.
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1. Polyacrylamides in reverse cationic iron ore flotation: bench scale study
Abstract A bench scale study was carried out to investigate the influence of polyacrylamides as co-depressant in a blend with starch depressant on the reverse cationic iron ore flotation. The results indicated that the use of polyacrylamides as dual function polymer should be an alternative to improve the flotation process. These polymers act as a depressant
REM, Int. Eng. J.. Publicado em: 2021-09
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2. Desestratificação de reservatórios por meio de aeração artificial
RESUMO No presente trabalho, avaliou-se em escala de laboratório e por meio de modelagem matemática o processo de desestratificação da coluna d’água usando aeração por ar difuso. Foram identificados dois padrões de escoamento: um regime de pluma, no qual o escoamento induzido pelas bolhas penetra na interface entre as duas camadas de diferentes den
Eng. Sanit. Ambient.. Publicado em: 30/05/2019
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3. Influence of Forging Pressure on Microstructural and Mechanical Properties Development in Linear Friction Welded Al-Cu Dissimilar Joint
Abstract Dissimilar AA5083 and C101 pure copper linear friction welds were prepared using different forging pressures (60 MPa, 80 MPa, and 110 MPa) to investigate the influence of the forging pressure on the microstructural and mechanical properties development using optical microscopy (OM), scanning electron microscopy (SEM), hardness measurements, and ten
Soldag. insp.. Publicado em: 18/04/2019
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4. Removal of entrained organic matter in the copper electrolyte by ozonation
Abstract Organic matter-in-aqueous entrainment is a serious problem in the hydrometallurgical extraction of copper from ore. Current inefficiencies, changes in the morphology and orientation of cathode deposit are some of the problems when organic matter is present in the advance electrolyte. In addition, negative effects upon metabolic activity of bioleachi
REM, Int. Eng. J.. Publicado em: 2019-03
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5. The value of high-flow nasal cannula oxygen therapy after extubation in patients with acute respiratory failure
OBJECTIVE: To investigate the value of high-flow nasal cannula oxygen therapy after extubation in patients with acute respiratory failure. METHODS: A single-center, prospective, randomized, controlled pilot trial was conducted between January 2013 and December 2014. Sixty enrolled patients were randomized immediately after extubation into either a high-flo
Clinics. Publicado em: 2017-09
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6. SELF-SIMILARITY OF VERTICAL BUBBLY JETS
AbstractAn integral model for vertical bubbly jets with nearly monodisperse bubble sizes is presented. The model is based on the Gaussian type self-similarity of mean liquid velocity, bubble velocity and void fraction, as well as on functional relationships for initial liquid jet velocity and radius, bubble diameter and relative velocity. Adjusting the model
Braz. J. Chem. Eng.. Publicado em: 2015-06
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7. Ontogênese do ritmo de consumo de oxigênio em operárias de Melipona quadrifasciata (Hymenoptera; Meliponini): a influência da luz / Ontogenesis of respiratory rhythms in Melipona quadrifasciata workers: the influence of light
As operárias de Melipona quadrifasciata exercem diferentes funções na colônia, segundo sua faixa etária. No interior da colônia, os indivíduos mais jovens, nutrizes, ficam localizados na região mais interna e aproximam-se progressivamente das regiões periféricas à medida que envelhecem. Os indivíduos mais velhos, forrageiras, saem da colônia dia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
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8. Numerical prediction of bed-load and surface deformation on a granular bed sheared by a turbulent boundary-layer
The entrainment of solid particles by a fluid flow is frequently found in nature and in industry. A better knowledge of this is of importance to understand the physical nature of the phenomenon and to improve industrial processes. Bed-load occurs if the shear stresses exerted by the fluid on the granular bed are bounded to some limits: a mobile granular laye
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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9. Pós-efeitos da sincronização em campo e a fase de atividade do roedor subterrâneo tuco-tuco (Rodentia: Ctenomyidae) / Aftereffects of field entrainment and the activity phase of the subterranean rodent tuco-tuco (Rodentia: Ctenomyidae)
Os tuco-tucos de Anillaco (Ctenomys cf. knighti) são roedores subterrâneos noturnos quando colocados em ciclo claro-escuro no laboratório. Com o interesse de se investigar o quanto um animal subterrâneo se expõe à luz, foi realizado um experimento de observação contínua em campo durante as horas claras do dia. Três indivíduos, um em cada estação
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2011
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10. Metodologia de projeto de queimadores a jato para fornos de clínquer / Design methodology of jet burners for clinker kiln
Os queimadores a jato são caracterizados pela elevada quantidade de movimento na direção axial e elevada potência, estes queimadores são muito empregados em fornos rotativos, principalmente na indústria do cimento e da calcinação. O projeto de queimadores a jato é realizado usualmente aproximando o escoamento de ar primário no queimador por um mode
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2011
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11. Density currents at steady regime
This work brings as its main contribution the study of the phenomenon of density currents in non-stratified reservoirs, with flows in steady regimes. Flows are analyzed for a wide range of Reynolds and Richardson numbers in the entrance of the reservoir. Based on this hypothesis, a hybrid numeric model is presented considering the Reynolds Transport's Equati
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-09
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12. Protective effect of maternal prenatal melatonin administration on rat pups born to mothers submitted to constant light during gestation
We studied the effects of adverse conditions such as constant light (LL) on the circadian rhythm of malate (MDH, EC 1.1.1.37) and lactate (LDH, EC 1.1.1.27) dehydrogenase activities of the testes of male Wistar rats on postnatal day 28 (PN28), anxiety-like behavior (elevated plus-maze test) at PN60 and sexual behavior at PN120. The rats were assigned to moth
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-09