Density Diagram
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia
Abstract The refractory materials used in the wall of the furnaces for glass melting can be prepared from mullite-zirconia composite material. The composite of mullite/zirconia was synthesized from Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were prepared with various ratios of kaoli
Cerâmica. Publicado em: 2021-03
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2. Métrica para avaliação da inconsistência hidrológica de terrenos representados por MDE / Metric for evaluate the hydrological inconsistency of terrains represented by DEM
This paper presents a method to evaluate the hydrologic inconsistencies in terrain represented by digital elevation model. This method becomes important because of the widespread use of GIS in the hydrology area and hydrological consistency of digital terrain models have received attention of many researchers. Currently checking the model hydrologic consiste
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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3. DENSIDADE DE ÁRVORES POR DIÂMETRO NA FLORESTA ESTACIONAL DECIDUAL NO RIO DO GRANDE SUL / DENSITY OF TREES BY DIAMETER IN SEASONAL DECIDUOUS FOREST IN RIO GRANDEDO SUL
O objetivo deste trabalho foi estudar a relação entre a densidade de árvores por hectare e o diâmetro médio para uma Floresta Estacional Decidual, bem como, ajustar o modelo Reineke para descrever este comportamento. A área de estudo localiza-se no município de Silveira Martins, na região central do Rio Grande do Sul e encontra-se em estágio inicial
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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4. Transições de fase hádron-quark em estrelas de nêutrons
Recent advances on the field of high energy physics have enabled the study of matter under extreme conditions and, in this context, new states of matter are being discovered and speculated upon. Among these hypothetical states of matter is the one of deconfined quarks in high densities and/or temperatures. An environment with extreme densities and low temper
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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5. Solvolysis reactions of cation +SiCl3: Experiment and Theory / Reações de solvólise em fase gasosa do cátion +SiCl3: experimento e teoria
Polyhalogenated silicenium ions, X3Si+ (X = F, Cl), are common fragment ions in the mass spectra of polyhalogenated silanes obtained by electron ionization. These ions are powerful electrophiles and are believed to play a role in plasma enhanced corrosion processes and plasma enhanced chemical vapour deposition processes. In this dissertation, we present som
Publicado em: 2010
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6. Expoente de Hurst e diagrama de fase para persistência induzida amnesticamente em processos não-markovianos. / Hurst exponent and the phase diagram for persistence induced amnestic on a non-Markovian
Nowadays there has been a growing interest in anomalous diffusion: the super difusive and sub-difusive processes. The problem about normal diffusion already well established whereas many problems still exist in anomalous diffusion. Several mathematical models and computational techniques have been developed to model such processes. In this work we studied a
Publicado em: 2009
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7. GUIAS DE DENSIDADE E ÍNDICES DE SÍTIOS PARA Hovenia dulcis Thunberg NA REGIÃO CENTRAL DO ESTADO DO RIO GRANDE DO SUL, BRASIL / DENSITY GUIDES AND SITES INDEXES FOR Hovenia dulcis Thunberg IN THE CENTRAL REGION OF THE STATE OF RIO GRANDE DO SUL, BRAZIL
O objetivo principal deste trabalho é construir curvas de índice de sítio relacionando altura dominante e idade e elaborar diagramas de manejo de densidade (DMD), para populações de Hovenia dulcis localizadas na região central do estado do Rio Grande do Sul, Brasil. Para tanto, foram utilizadas informações de 4 povoamentos, com idades de 25 anos, loc
Publicado em: 2009
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8. Uncovering the secrets of unusual phase diagrams: applications of two-dimensional Wang-Landau sampling
We use a two-dimensional Wang-Landau sampling algorithm to calculate the density of states for two discrete spin models and then extract their phase diagrams. The first system is an asymmetric Ising model on a triangular lattice with two- and three-body interactions in an external field. An accurate density of states allows us to locate the critical endpoint
Brazilian Journal of Physics. Publicado em: 2008-03
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9. Modeling of dynamic rotors with flexible bearings due to the use of viscoelastic materials
Nowadays rotating machines produce or absorb large amounts of power in relatively small physical packages. The fact that those machines work with large density of energy and flows is associated to the high speeds of rotation of the axis, implying high inertia loads, shaft deformations, vibrations and dynamic instabilities. Viscoelastic materials are broadly
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-03
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10. SELF-THINNING AND DENSITY MANAGEMENT DIAGRAM IN Pinus taeda L. STANDS / AUTODESBASTE E DIAGRAMA DE MANEJO DA DENSIDADE EM POVOAMENTOS DE Pinus taeda L.
This thesis aims at studying the efficiency of models which express the size-density relationship in even-aged stands of Pinus taeda L., handled in complete and full stock densities. For that, Reineke, Yoda, Zeide and Tang models were tested using data obtained from 50 permanent sample plots placed in stands implanted in spacing of 1.5x1.0 m, 2.5x1.0 m, 1.5x
Publicado em: 2008
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11. Efeitos anarmônicos e transições de fase em Pb1xLaxTiO3: estudo por espalhamento Raman dos efeitos de substituição catiônica, temperatura e pressão hidrostática
In this work were studied eects of cationic substitution, hydrostatic pressure and temperature on the phonon spectra of PLT samples, Pb1xLaxTiO3 (PLT), using Raman scattering technique. The samples having La concentration x= 0, 2.5, 5, 10, 15 and 20%, were prepared by the classic powder mixture of oxides. Other complementary techniques were used to character
Publicado em: 2008
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12. Estado fundamental do modelo de Hubbard estendido na cadeia AB2
In this dissertation we study the extended Hubbard model in the AB2 chain. The model hamiltonian contains a kinetic term, parameterized by t, and two terms of coulomb repulsion,U (intra-site) and V (inter-site). Considering a peculiar local exchange symmetry of the chain, as well as global symmetries of the Hubbard hamiltonian, we have applied the numerical
Publicado em: 2008