Disordered Materials
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Development of Silica-Based Monoliths for the Capture of CO2
The synthesis of mesoporous materials in macroscopic scale, as for example, the monoliths, has been of great interest in view of the wide range of applications that this material holds. Thus, this work consists of the production of silica monoliths for the purpose of they being used in the carbon dioxide (CO2) adsorption process. The adsorbents were prepared
Mat. Res.. Publicado em: 30/09/2019
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2. Validation of the Brazilian version of the Pediatric Obstructive Sleep Apnea Screening Tool questionnaire,
Resumo Objetivo: Validar o questionário Pediatric Obstructive Sleep Apnea Screening Tool para o seu uso no Brasil. Materiais e métodos: A versão brasileira desse questionário, originalmente validado e testado nos Estados Unidos, foi desenvolvida a partir das seguintes etapas: a) tradução; b) retrotradução; c) conclusão da versão final; d) pré-te
J. Pediatr. (Rio J.). Publicado em: 11/04/2019
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3. The Contribution of Mechanical Spectroscopy to Understanding Grain Boundary Sliding
This review paper shows that grain boundary sliding (GBS) is a general phenomenon occurring in all classes of inorganic materials: ceramics, metals and composite materials. The occurrence of relaxations attributed to GBS is also quite general and therefore the mechanical spectroscopy constitutes a sensitive and universal technique to study such phenomenon. G
Mat. Res.. Publicado em: 25/10/2018
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4. 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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5. GENERALIZAÇÃO DO MODELO DE BARREIRAS DE ENERGIAS LIVRES ALEATÓRIAS PARA O ESTUDO DA CONDUTIVIDADE AC DE SISTEMAS SÓLIDOS DESORDENADOS / GENERALIZAÇÃO DO MODELO DE BARREIRAS DE ENERGIAS LIVRES ALEATÓRIAS PARA O ESTUDO DA CONDUTIVIDADE AC DE SISTEMAS SÓLIDOS DESORDENADOS
In this work it is proposed a generalized equation for universal behavior of the alternating conductivity, σ*(ω) = σ‟(ω) + iσ(ω), of disordered solid materials based on the Random Free Energy Barrier model deduced by J. C. Dyre in 1985. In this context, we tried to understand the conduction mechanisms and charge transport
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/11/2011
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6. Interação plasmon-fônon LO em superredes semicondutoras
This work presents a Raman investigation of the optical vibrations in highly doped In-GaAs/InP and GaAs/AlGaAs superlattices (SLs). The InGaAs/InP SLs grown with different periods were analyzed using polarized Raman techniques. No Raman selection rules were found in the long period InGaAs/InP SLs due to the structural defects in the bulk materials constituti
Publicado em: 2008
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7. 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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8. Modificação do Poli(hidroxibutirato) PHB com nucleantes e com o copolímero (etileno-co-acetato de vinila) - EVA
In this work, we sought to modify PHB, processing it in the melted state, and to evaluate the effect of the modifications on its mechanical properties and biodegradation characteristics. The following systems were therefore studied: a PHB/EVA blend, in a 90/10 ratio, with an ethylene-co-vinyl acetate copolymer containing 28% of VA; a PHB and PHB/EVA blend wi
Publicado em: 2008
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9. Influência da ordem-desordem estrutural na fotoluminescência do CaTiO3:Sm / Influence of the order-disorder structural on the photoluminescence of the CaTiO3
Some properties of the materials, such as ferroelectric and optic, are dependents to structural organization of the material. Thus, to know the orderdisorder degree at short, intermediate and long range is important to elucidate or predict properties in materials. The PL emission at room temperature will be used to study the structural orderdisorder at short
Publicado em: 2007
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10. Experimental research of the random fuse model / Estudo experimental do modelo aleatório de fusíveis
O objetivo deste trabalho é verificar, através de um estudo experimental do Modelo Aleatório de Fusíveis, como a orientação e a desordem da rede de fusíveis influenciam o processo de fratura da rede. Para a efetivação dos experimentos foi criado um circuito de tamanho L x L, com as ligações entre os fusíveis orientadas à 45 da direção de aplic
Publicado em: 2007
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11. PHYSICS OF STRONGLY CORRELATED AND DISORDERED SYSTEMS / FÍSICA DE SISTEMAS FORTEMENTE CORRELACIONADOS E DESORDENADOS
In this thesis we study the properties of strongly correlated and disordered materials, using model Hamiltonians to describe them. The thesis is divided in two parts. The first one studies the periodic Anderson model used to describe the properties of a Kondo insulator. In particular we take Ce3Bi4Pt3 as a paradigmatic compound, characterized by a small gap(
Publicado em: 2004
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12. Evolução morfodinâmica da região de influência estuarina do Rio Curimataú/RN, com ênfase nas alternativas do ambiente deposicional de manguezal e a integração de geodados em Sig
The estuaries are important investigation zones of the actual morphodynamic and of depositional facies of recent geological history. They are constituted in important receptor means of the coastal area sediments, where the evolutionary processes occur quickly. They are also attractive means for the development of anthropic activities, which in a disordered w
Publicado em: 2004