Theory Of Membranes
Mostrando 1-12 de 84 artigos, teses e dissertações.
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1. The Concept of a Rupture Risk Envelope for the Cochleo-Saccular Membranes
Abstract Introduction Alterations in endolymphatic pressure have long been suspected of being associated with the development of endolymphatic hydrops and rupture of the membranous labyrinth. More recently, there has been a focus on how membrane mechanics might contribute to membrane rupture. This is suspected to involve the viscoelastoplastic properties of
International Archives of Otorhinolaryngology. Publicado em: 2022
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2. Membrane Stress in the Human Labyrinth and Meniere Disease: A Model Analysis
Introduction The nature and extent of membrane damage encountered in Meniere disease remains unexplained. Pressure-induced membrane stress may underlie the characteristic hydropic distention. Analysis of stress in the several vestibular chambers may offer insight into the nature and progression of Meniere disease. Objective Membrane stress levels will be
Int. Arch. Otorhinolaryngol.. Publicado em: 2015-12
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3. Membrane Stress Proclivities in the Mammalian Labyrinth
Introduction The membranes of the inferior division of the labyrinth in some mammals appear more vulnerable to hydropic distention than those of the superior division. This finding in guinea pigs, cats, and humans has been attributed to the evidently thinner membranes with implied higher stress levels. Objective The objective of this study is to identify
Int. Arch. Otorhinolaryngol.. Publicado em: 2014
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4. Pode a não-comutatividade do espaço indicar a dependência funcional da entropia com a área
Calculation of the entropy of black holes is an open subject. Such problem is very interesting due to its relationship with basic problems like; the construction of a quantum theory of the gravity, statistical approach of the calculation of black holes entropy and the validity (or non validity) of the holographic principle. In this work we are looking for a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/10/2009
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5. DYNAMIC ANALYSIS OF HYPERLASTIC CIRCULAR MEMBRANES / ANÁLISE DINÂMICA DE MEMBRANAS CIRCULARES HIPERELÁSTICAS
This work presents an analysis of the nonlinear vibration response of a prestretched hyperelastic circular membrane subjected to finite deformations. The membrane material is assumed to be isotropic, homogeneous and neo-Hookean. Based on the theory of finite deformations for hyperelastic membranes, a variational formulation is developed. First the exact solu
Publicado em: 2009
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6. Reinforced concrete membranes design. / Dimensionamento de chapas de concreto armado.
Procedures are presented for the reinforced concrete membranes design with orthogonal mesh, which does not coincide with principal stress directions. A review of the theoretical fundamentals for Baumann Method and Modified Compression Field Theory is presented, and in the first was used the stress-strain relationships for the cracked concrete developed by Ve
Publicado em: 2008
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7. Structural analysis and shape-dependent catalytic activity of Au, Pt and Au/Pt nanoparticles
Metallic nanoparticles of Au, Pt and Pt/Au have been synthesized using a chemical reduction approach. The structural characterization of these metallic nanoparticles has been carried out using conventional transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HR-TEM) techniques. HR-TEM images of Pt nanoparticles reveal
Matéria (Rio de Janeiro). Publicado em: 2008
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8. Sobre a busca de superfícies minimais e seu emprego nas estruturas de membrana. / On finding minimal surfaces and their application to membrane structures.
This dissertation presents a historical review on the theoretical developments on minimal surfaces, highlighting the important analogy between the problems of finding minimal area surfaces and finding membrane surfaces with homogeneous and isotropic stress fields. Some geometric concepts of the parametric surfaces are placed, on the basis of differential geo
Publicado em: 2008
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9. Competitive adsorption of copper and mercury ions on natural and crosslinked chitosan membranes / Adsorção competitiva dos ions cobre e mercurio em membranas de quitosana natural e reticulada
Recent investigations have described chitosan, a linear polysaccharide obtained from deacetylation of chitin, as a suitable biopolymer to remove heavy metal ions from wastewater, since the amino and hydroxyl groups present in its structure can act as chelating sites. Several methods have been used to modify natural chitosan, such as crosslinking with glutara
Publicado em: 2008
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10. Dependência térmica da osmoestabilização de eritrócitos por glicerol / Structure and stability of biological membranes
The biological organization complexes, which comprise proteins, membranes, chromosomes, organelles, cells and tissues, have to keep their stabilities against the deleterious action of factors as variations in temperature, pH and concentration of solutes. Among the protective mechanisms is the stabilization promoted by the action of solutes generally called a
Publicado em: 2006
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11. Atomistic simulation for difusion mechanisms investigation : self diffusion coeficient of simples gases in polymeric matrix / Simulação atomistica como ferramenta para investigação dos mecanismos de difusão : coeficientes de autodifusão de gases simples em matriz polimerica
In this thesis a study of the predictive potential of the molecular dynamic simulation was performed for transport properties of light gases in polyimide matrix. From de practical point of view permeability is the property of most interest, and involves kinetics as well as thermodynamics properties, diffusion coefficient and solubility of the penetrants mole
Publicado em: 2006
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12. NON-LINEAR BEHAVIOR AND INSTABILITY OF HYPERELASTIC MEMBRANES AND SHELLS / COMPORTAMENTO NÃO-LINEAR E INSTABILIDADE DE MEMBRANAS E CASCAS HIPERELÁSTICAS
This thesis investigates the large deformations of hyperelastic membranes and shells. The static nonlinear behavior and possible instabilities of the membrane are both analyzed. A detailed experimental analysis was carried out involving cylindrical membranes and shells with different geometries and initial axial forces and the influence of the axial force an
Publicado em: 2003