Disordered Phases
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Microwave radiation influence on the thermal and spectroscopic properties of Na-birnessite-type material
Resumo No presente trabalho, apresenta-se um estudo da influência da radiação micro-ondas nas propriedades térmica e espectroscópica, assim como estrutural (ordem-desordem) e morfológica, de óxido de Mn estruturado em camada tipo Na-birnessita. A rota empregada para obtenção da matriz lamelar foi a precipitação redox. Os produtos foram caracteriza
Cerâmica. Publicado em: 14/11/2019
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2. Tri-modal Microstructure in Different Loading Zones Under TA15 Ti-alloy Isothermal Local Conventional Forging and Given Subsequent Heat Treatment
For TA15 Ti-alloy large-scale component, isothermal local conventional forging (ILCF) combined with subsequent heat treatment provides a feasible approach to obtain a tri-modal microstructure with attractive comprehensive performance. However the tri-modal microstructure characteristics and evolution laws in the first and second loading zones are lack of und
Mat. Res.. Publicado em: 10/06/2019
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3. Effects of artepillin C on model membranes displaying liquid immiscibility
It has been hypothesized that the therapeutic effects of artepillin C, a natural compound derived from Brazilian green propolis, are likely related to its partition in the lipid bilayer component of biological membranes. To test this hypothesis, we investigated the effects of the major compound of green propolis, artepillin C, on model membranes (small and g
Braz J Med Biol Res. Publicado em: 25/03/2019
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4. O efeito da pressão sobre transições desordenadas do silício líquido / The effect of pressure on disordered transitions of liquid silicon
Neste trabalho, investigamos os efeitos da pressão sobre as transições entre as fases líquidas e amorfas em silício sobre regime super-resfriado. A investigação é feita através de simulações computacionais, onde técnicas eficientes para cálculo da energia livre, são implementadas sobre o método Monte Carlo. Nossos cálculos, utilizam um potenc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2012
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5. Preparação e Caracterização de Pós e Filmes De PbTiO3 obtidos pelo Método Pechini / Preparation and Characterization of Powders and Films From PbTiO3 obtained by Pechini method
Non-crystalline materials, commonly referred to as amorphous materials have attracted great interest in engineering and technology. This is due mainly to its photoluminescent properties at room temperature around 25 C. The aim of this study was the Pechini method in order to obtain ceramic powders and amorphous films of amorphous lead titanate. The lead tita
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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6. Study of the photoluminescent properties of MgTiO3 powder and thin films obtained by the polimeric precursor method / Estudo das propriedades fotoluminescentes de pós e filmes finos de MgTiO3 obtidos pelo método dos precursores poliméricos
In this study, MgTiO3 (MTO) powders and thin films that crystallize in a perovskite ilmenite crystalline structure were obtained and characterized. MTO were synthesized by the polymeric precursor method (PPM), which allows obtaining structurally ordered and disordered structures. In addiction, the photoluminescent properties were investigated as a function o
Publicado em: 2011
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7. Tratamento de água para consumo humano de reservatório eutrofizado através de pré e interoxidação, adsorção em carvão ativado e dupla filtração / Drinking water treatment of eutrophic reservoir by pre and interoxidation, activated carbon adsorption and double filtration
Disordered basins occupation provoked acceleration of eutrophication, which besides purely aesthetic and landscaping problems, results in occurrence of high phytoplankton densities with potentially toxic cyanobacteria dominance. Alongside physical aging and consequent deterioration of installations, usual treatment technologies do not provide adequate condit
Publicado em: 2011
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8. ESTUDO DAS PROPRIEDADES ELÉTRICAS DE COMPÓSITOS CARBONO-ARGILA OBTIDOS A PARTIR DA BORRA DE PETRÓLEO PELO MÉTODO DE QUATRO PONTAS / STUDY OF ELECTRICAL PROPERTIES OF CARBON-CLAY COMPOSITES OBTAINED FROM THE METHOD OIL SLUDGE FOUR TIPS
The petroleum industry produces significant amounts of residues in several of its processes, from the perforation of wells, production, storage, transport and refining, to the distribution of its derivatives. The wastewater generated in the oil extraction step is known as produced water and, when stored in flotation tanks, if generates a residue called oily
Publicado em: 2010
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9. Escala de Distúrbios do Sono em Crianças: tradução, adaptação cultural e validação / Sleep Disturbance Scale for Children: translation, cultural adaptation and validation
Introduction: The Sleep Disturbance Scale for Children (SDSC) is a 26-item instrument for evaluating sleep among children aged 3-18 years. It differentiates among conditions such as disorders of initiating and maintaining sleep, sleep breathing disorders, disorders of arousal, sleep-wake transition disorders, excessive somnolence, and sleep hyperhydrosis. Th
Publicado em: 2009
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10. Transição ordem-desordem da matéria de vórtices em supercondutores detectada através do terceiro harmônico da suscetibilidade AC
Although a vortex state, in type II superconductors, has been anticipated more than 50 years ago, a great deal of theoretical and experimental efforts has still been done in an attempt to investigate how the dynamics of these structures depends on external excitations and on the inherent properties of the underlying superconducting material, such as inhomoge
Publicado em: 2008
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11. Phase diagrams of the Blume-Emery-Griffiths thin films
We study the spin-1 Blume-Emery-Griffiths model with bilinear and biquadratic exchange interactions and single-ion crystal field, using the mean field theory. In addition to the four usual phases: The disordered phase D, the ferromagnetic phase F, the staggered quadrupolar phase SQ and The ferrimagnetic phase I, we found two new phases, in the case of a thin
Brazilian Journal of Physics. Publicado em: 2006-06
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12. Monte Carlo study of the anisotropic three-dimensional Heisenberg model in a crystal field
We study the phase diagram of the three-dimensional classical ferromagnetic Heisenberg model with an easy-plane crystalline anisotropy and an easy-axis exchange anisotropy through Monte Carlo simulations. We employ the Metropolis algorithm together with single-histogram techniques in order to characterize the transitions in each region of the phase diagram.
Brazilian Journal of Physics. Publicado em: 2004-06