Curvature Flow
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. A remark on soliton equation of mean curvature flow
Nesta nota, consideramos imersões auto-semelhantes do fluxo de curvatura média, e mostramos que uma solução em forma de gráfico da equação de soliton converge diferencialmente, contanto que tenha derivada limitada, para um gráfico cuja função tem propriedades especiais (V. Teorema 1.1).
Anais da Academia Brasileira de Ciências. Publicado em: 2004-09
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14. Proteins with mechanical functionality: a physico-chemical study on the viscoelasticity of gliadin, a storage protein from wheat gluten / Proteínas com funcionalidade mecânica: um estudo físico-químico sobre a viscoelasticidade da gliadina, uma proteína de reserva do glúten do trigo
The thesis consisted in a rheological study of the dynamics of gels and dispersions of gliadin from wheat gluten in pure dimethylsulfoxide, dimethylformamide or formamide and in their mixtures with water. The effect of temperature and that of the concentration of the component species (protein and solvent constituents) on flow behavior and deformation were e
Publicado em: 2004
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15. Modeling of turbulent flow through radial diffuser
The work considers the modeling of turbulent flow in radial diffuser with axial feeding. Due to its claimed capability to predict flow including features such as separation, curvature and adverse pressure gradient, the RNG k-epsilon model of Orzag et al. (1993) is applied in the present analysis. The governing equations are numerically solved using the finit
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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16. SOLIDIFICATION AND FUSION OF PURE SUBSTANCES UNDER THE INFLUENCE OF LAMINAR AND TURBULENT NATURAL CONVECTION / SOLIDIFICAÇÃO E FUSÃO DE SUBSTÂNCIAS PURAS SOB A INFLUÊNCIA DA CONVECÇÃO NATURAL LAMINAR E TURBULENTA / SOLIDIFICACIÓN Y FUSIÓN DE SUSTANCIAS PURAS SOBRE LA INFLUENCIA DE CONVECCIÓN NATURAL LAMINAR Y TURBULENTA
Solidification and fusion belong to a class of transient heat transfer problems known as phase change problems or moving boundary problems. The solution of this class of problems presents an additional difficulty concerning the movement of the interface. This movement is due to the absorption or removal of the latent heat at the interface. As a consequence t
Publicado em: 2000
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17. Estudo numerico de um escoamento bifasico, laminar : padrões anular e estratificado
A numerical solution of the two-dimensional momentum equations for a two-phase, Newtonian fluid(s), steady, laminar, axial, fully developed flow in a long, horizontal, circular pipe is conducted. The annular and stratified patterns are considered by assuming the interface between the phases to be either circular-cylindrical or an arc-segment of a cylindrical
Publicado em: 1995
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18. Image processing via level set curvature flow.
We present a controlled image smoothing and enhancement method based on a curvature flow interpretation of the geometric heat equation. Compared to existing techniques, the model has several distinct advantages. (i) It contains just one enhancement parameter. (ii) The scheme naturally inherits a stopping criterion from the image; continued application of the
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19. The biphasic spirogram: a clue to unilateral narrowing of a mainstem bronchus.
Two patients with narrowing of a mainstem bronchus each showed two unusual functional features that are likely to be characteristic of this condition. The maximum inspiratory flow-volume curve showed an end inspiratory "tail" and the forced expiratory spirogram had a biphasic shape with normal initial curvature but a "straight line" appearance in later expir
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20. Role of the membrane cortex in neutrophil deformation in small pipets.
The simplest model for a neutrophil in its "passive" state views the cell as consisting of a liquid-like cytoplasmic region surrounded by a membrane. The cell surface is in a state of isotropic contraction, which causes the cell to assume a spherical shape. This contraction is characterized by the cortical tension. The cortical tension shows a weak area dila
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21. On intra- and intersubject variabilities of airflow in the human lungs
The effects of intra- and intersubject variabilities in airway geometry on airflow in the human lungs are investigated by large eddy simulation. The airway models of two human subjects consisting of extra- and intrathoracic airways are reconstructed from CT images. For intrasubject study, airflows at two inspiratory flow rates are simulated on the airway geo
American Institute of Physics.
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22. A novel flow cytometric assay to quantify interactions between proteins and membrane lipids
A diverse set of experimental systems has been developed to probe protein-lipid interactions. These include measurements with the headgroups of membrane lipids in solution, immobilized membrane lipids, and analysis of protein binding to membrane lipids reconstituted in liposomes. Each of these methodologies has strengths but also substantial limitations. For
American Society for Biochemistry and Molecular Biology.
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23. Lung function abnormalities in repaired oesophageal atresia and tracheo-oesophageal fistula.
BACKGROUND: Respiratory complications are common after neonatal repair of oesophageal atresia and tracheo-oesophageal fistula. The prevalence of lung function abnormalities and the relation between gastrointestinal complications and lung function has not been studied in a large number of patients. METHODS: Lung volumes and flow-volume loops were measured in
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24. Phosphate-limited continuous culture of Rhodotorula rubra: kinetics of transport, leakage, and growth.
The phosphate-limited growth kinetics of Rhodotorula rubra, a small yeast of marine origin, were examined by analysis of 32P distributions in continuous cultures. Isotope relaxation procedures were used to identify unidirectional flows of Pi and organic phosphate among compartments modeled during growth. The concentrations of phosphates in these compartments