Shrinking
Mostrando 1-12 de 84 artigos, teses e dissertações.
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1. DETERMINATION OF REACTIVITY AND THERMODYNAMIC ANALYSIS OF NICKEL-BASED OXYGEN CARRIERS FOR CHEMICAL-LOOPING COMBUSTION
Abstract This work aimed to study nickel-based oxygen carriers (OC) for Chemical Looping Combustion (CLC) using H2 and CH4 as fuel. The reactivity and reaction kinetics of the OC were investigated, applying the shrinking core, nucleation and diffusion models in three dimensions, as well as whether the OC is thermodynamically favorable for the reaction. The r
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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2. Padrões recentes de inserção e mobilidade no trabalho doméstico no Brasil metropolitano: descontinuidades e persistências
Resumo Essencialmente feminino, negro e pobre, o emprego doméstico é tratado diferentemente até mesmo pela legislação. Esse artigo tem o objetivo de identificar como o ciclo de vida, geração e outras características individuais da mulher, assim como fatores conjunturais, afetam a chance de estar e permanecer no emprego doméstico remunerado, no Brasi
Rev. bras. estud. popul.. Publicado em: 02/12/2019
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3. Cinética de dissolução de um metacaulim amazônico em ácido nítrico
Resumo O estudo cinético da dissolução de um metacaulim amazônico foi realizado com a aplicação do modelo ‘shrinking core model’ para partículas esféricas e ‘placas planas’ com tamanho constante. O caulim amazônico foi calcinado a 700 ºC para promover a formação do metacaulim. O metacaulim foi lixiviado utilizando ácido nítrico com exce
Cerâmica. Publicado em: 2018-03
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4. The Association of Vitamin D Levels and the Frailty Phenotype Among Non-geriatric Dialysis Patients: A Cross-sectional Study
OBJECTIVES: The aim of this study was to investigate the frequency of frailty and the association of vitamin D levels and the frailty phenotype among non-geriatric dialysis patients. METHOD: Seventy-four stable, chronic hemodialysis patients from the hemodialysis unit of the hospital were enrolled in the study. The patients’ medical histories and laborat
Clinics. Publicado em: 15/02/2018
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5. Mathematical modeling of manganese adsorption onto bone char in a continuous fixed bed column incorporating backmixing and shriking core approaches
Abstract The present study investigated the dynamics of manganese adsorption onto bone char in a continuous fixed bed column using a mathematical model that incorporates: (i) the backmixing model to describe the fluid flow through the bed and (ii) the shrinking core model to describe the kinetic and mass transfer phenomena within spherical adsorbent particle
Braz. J. Chem. Eng.. Publicado em: 2017-07
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6. MATHEMATICAL MODELING OF BATCH ADSORPTION OF MANGANESE ONTO BONE CHAR
Abstract The present study investigated the dynamics of batch adsorption of manganese onto bone char by using two distinct mathematical formulations: the diffusion model and the shrinking core model. Both models assumed spherical particles and adequately described the transient behavior of metal adsorption under changing operating conditions. Comparatively,
Braz. J. Chem. Eng.. Publicado em: 2016-06
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7. Kinetic Analysis of the Decomposition of the KFe3(SO4)2-x(CrO4)x(OH)6 Jarosite Solid Solution in Ca(OH)2 Medium
The decomposition of the solid solution of potassium jarosite with chromium(VI) in Ca(OH)2 media was studied in the present work. According to experimental results, the incorporation of CrO42- into the crystal structure of jarosite resulted in a solid solution with the following approximate formula: [K0.86(H3O)0.14]Fe2.67[(SO4)1.23(CrO4)0.77][(OH)5.01(H2O)0.
J. Braz. Chem. Soc.. Publicado em: 2016-06
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8. Sensorimotor performance in euthymic bipolar disorder: the MPraxis (PennCNP) analysis
Background: Sensorimotor deficits are an important phenomenological facet observed in patients with bipolar disorder (BD). However, there is little research on this topic. We hypothesize that the MPraxis test can be used to screen for motor impairments in BD aiming movements. Method: The MPraxis, which is a quick and easy-to-apply computerized test, measu
Rev. Bras. Psiquiatr.. Publicado em: 17/03/2014
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9. Regulatory volume decrease in Leishmania mexicana: effect of anti-microtubule drugs
The trypanosomatid cytoskeleton is responsible for the parasite's shape and it is modulated throughout the different stages of the parasite's life cycle. When parasites are exposed to media with reduced osmolarity, they initially swell, but subsequently undergo compensatory shrinking referred to as regulatory volume decrease (RVD). We studied the effects of
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-02
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10. A internacionalização das empresas espanholas
The internationalization of Spanish companies. The purpose of this article is to present the process of (late) internationalization of Spanish companies occurred between the years of 1990 and 2000, its determinants and the degree of involvement of the State in this process. We can point out some determinants in this process, such as: a fall in the profitabil
Brazil. J. Polit. Econ.. Publicado em: 2012-12
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11. Exploring the association between Trypanosoma cruzi infection in rural communities and environmental changes in the southern Gran Chaco
The association between land use and land cover changes between 1979-2004 in a 2.26-million-hectare area south of the Gran Chaco region and Trypanosoma cruzi infection in rural communities was analysed. The extent of cultural land, open and closed forests and shrubland up to 3,000 m around rural communities in the north, northwest and west of the province of
Memórias do Instituto Oswaldo Cruz. Publicado em: 2012-03
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12. Sólitons de Ricci Shrinking em variedades Riemannianas completas / Complete Gradient Shrinking Ricci Soliton
Nesse trabalho, nós começamos com um levantamento histórico sobre os Ricci Sólitons, mostrando que, muitas vezes, eles surgem como solução auto-similar do fluxo de Ricci. Em seguida, introduzimos alguns conceitos básicos de geometria Riemanniana e definimos formalmente um Rici Sóliton. Concluimos o trabalho com um estudo aprofundado do artigo [6], do
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011