Steady States
Mostrando 1-12 de 205 artigos, teses e dissertações.
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1. Photoluminescence of Solvent-Selected Fluorescent Moieties in MEH-PPV Solutions and Films
In this work, we examined how photoluminescence in poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is affected by morphology, dictated by the mode of preparation. For that, MEH-PPV dilute solutions in good and non-solvents, thick cast films with poly[methylmethacrylate] (PMMA) as inert matrix and spin-coated thin films were prepared. Thes
J. Braz. Chem. Soc.. Publicado em: 2018-03
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2. The establishment of the time interval between inspections for a cold standby system with component repair
Abstract The time interval between inspections of cold standby systems is a crucial decision to ensure the appropriated system reliability and the lowest costs possible. This paper presents a model developed to establish the optimal time interval between inspections for a two-unit cold standby system with component repair and subject to periodic inspection,
Prod.. Publicado em: 31/08/2017
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3. State estimation of chemical engineering systems tending to multiple solutions
A well-evaluated state covariance matrix avoids error propagation due to divergence issues and, thereby, it is crucial for a successful state estimator design. In this paper we investigate the performance of the state covariance matrices used in three unconstrained Extended Kalman Filter (EKF) formulations and one constrained EKF formulation (CEKF). As bench
Braz. J. Chem. Eng.. Publicado em: 2014-09
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4. Influence of ?S-globin haplotypes and hydroxyurea on tumor necrosis factor-alpha levels in sickle cell anemia
Background: Sickle cell anemia is a chronic inflammatory disease characterized by an increased production of proinflammatory cytokines including tumor necrosis factor-alpha. Hydroxyurea, by decreasing the polymerization of hemoglobin, reduces inflammatory states. The effect of the genetic polymorphisms of sickle cell patients on tumor necrosis factor-alpha
Rev. Bras. Hematol. Hemoter.. Publicado em: 2014-04
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5. Produção de carotenoides em culturas in vitro de Cleome rosea Vahl ex DC (Capparaceae) e avaliação de sua toxicidade e potencial antioxidante / Carotenoid production in vitro cultures of Cleome rosea Vahl ex DC (Capparaceae) and evaluation of toxicity and antioxidant potential.
The production and optimization of plants secondary metabolites with medicinal value have been achieved by using plant tissue culture techniques, which have showed great relevance when considering the conservation status of a species or their occurrence in degraded environments. The present study assessed the production of carotenoids in callus and cell susp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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6. Forms of sulfur in Brazilian Oxisols under no-tillage system / Formas de enxofre em Latossolos sob sistema plantio direto
Soil is a critical component of the global sulfur (S) cycle acting as source and a sink for various S species and mediating changes of S oxidation states. However, very little is known about the identities of these specific organic and inorganic S containing molecules, especially in Brazilian soils under no-tillage (NT) system. Thus, the objectives of this s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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7. Comportamento crítico da produção de entropia em modelos com dinâmicas estocásticas competitivas / Critical behavior of entropy production in models with competitive stochastic dynamics
We study kinetic phase transitions and the critical behavior of the entropy production in spin models with nearest neighbor interactions subject to two Glauber dynamics, which simulate two thermal baths at different temperatures. In this way, it is assumed that the system corresponds to a continuous time Markov process which obeys the master equation. Thus,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2011
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8. Infestation of thornbird nests (Passeriformes: Furnariidae) by Psammolestes tertius (Hemiptera: Reduviidae) across Brazilian Cerrado and Caatinga ecoregions
Psammolestes tertius Lent & Jurberg, 1965 is a sylvatic triatomine bug species that occurs in thornbird nests in Brazil. We studied infestation of 527 nests of Phacellodomus rufifrons Wied, 1821 and Phacellodomus ruber Vieillot, 1817 by P. tertius in eight Brazilian states across the Cerrado and Caatinga ecoregions. Psammolestes tertius occurred in 44% of th
Zoologia (Curitiba). Publicado em: 2011-06
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9. Trapping state stabilization in a micromaser with a mixed atomic beam
A scheme which stabilizes the trapping states in micromasers is proposed and studied. It uses an atomic beam composed of a mixture of two types of atoms. Numerical simulations based on the Monte Carlo wavefunction method show that, despite collective events, it is possible to obtain a steady-state photon number distribution limited (‘‘trapped’’) to a
Publicado em: 2011
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10. Modelagem tridimensional da estrutura trófica em ecossistemas aquáticos continentais rasos
Esta tese identificou vários aspectos importantes da estrutura trófica e dinâmica de nutrientes em ecossistemas aquáticos sujeitos a perturbações externas, tais como mudanças no nível da água, aumento de carga de nutrientes e matéria orgânica, biomanipulação e clima. Para descrever tais efeitos sobre a estrutura trófica, um complexo modelo ecol
Publicado em: 2010
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11. AplicaÃÃo de um teste de convergÃncia condicional para estados brasileiros. / Application of a test for conditional convergence states.
This work investigates, through econometric tests, the occurrence of income convergence among Brazilian States for the period between 1985 and 2006. Despite being the study of conditional Ã-convergence, it includes the analysis of σ- convergence, necessary to obtain conclusive data on the occurrence of convergence. The collected data used in the resear
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/12/2009
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12. Temperature and doping dependencies of electron mobility in InAs, AlAs and AlGaAs at high electric field application
Temperature and doping dependencies of electron mobility in InAs, AlAs and AlGaAs structures have been calculated using an ensemble Monte Carlo simulation. Electronic states within the conduction band valleys at the Γ, L and X are represented by non-parabolic ellipsoidal valleys centred on important symmetry points of the Brillouin zone. The simulation show
Brazilian Journal of Physics. Publicado em: 2008-09