Viscoelasticity Of Structure
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers
Abstract This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh’s method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considere
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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2. Kelvin Viscoelasticity and Lagrange Multipliers Applied to the Simulation of Nonlinear Structural Vibration Control
Abstract This study proposes a new pure numerical way to model mass / spring / damper devices to control the vibration of truss structures developing large displacements. It avoids the solution of local differential equations present in traditional convolution approaches to solve viscoelasticity. The structure is modeled by the geometrically exact Finite Ele
Lat. Am. j. solids struct.. Publicado em: 2016-05
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3. Proposição de um modelo matemático para o estudo da alteração mecânica do músculo liso da traquéia de ratos Wistar exposto à solução de formaldeído e submetido a doses crescentes de um agente contrátil / Proposition of a mathematical model to study the mechanical change of the smooth muscle of the trachea of Wistar rats exposed to formaldehyde solution and subjected to increasing doses of a contractile agent
The viscoelastic properties of the mammalian lung is mainly determined by the mechanical properties, structure and regulation of the airways smooth muscle. The exposure to polluted air may deteriorate these properties with harmful consequences to individual health. Formaldehyde is an important indoor pollutant that permeate through the smooth muscle tissue f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2012
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4. Análise não linear de sólidos viscoelásticos bidimensionais: implementação em elementos finitos e contribuição para aplicação a túneis. / Nonlinear analysis of two-dimensional viscoelastic solid: finite element implementation and contribution for practical application in tunnels.
O objetivo deste trabalho é aplicar uma formulação viscoelástica bidimensional sob não linearidade geométrica para estado plano de deformação baseada em grandezas energicamente conjugadas a partir do gradiente da transformação e do primeiro tensor das tensões de Piola- Kirchhoff. Esta formulação viscoelástica é composta pela equação constitu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2011
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5. Chromatin supraorganization and extensibility, and nuclear composition in mouse cells / Supraorganização e extensibilidade da cromatina, e composição nuclear em celulas de camundongo
Aging may be defined as the changes that take place in an organism with time. This process, in biology, is called senescence. Cellular senescence is observed in isolated cells, and has been studied typically in cultured cells, but its occurrence in vivo has been shown only in some mammalian tissues. Chromatin changes that take place with cellular senescence
Publicado em: 2008
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6. Structural, morphological and functional analysis of superficial digital flexor chicken tendons / Analise estrutural, morfologica e funcional do tendão flexor digital superficial de frangos
The structure-function relationship has been shown in several works regarding collagenous tissues, such as tendon. It is known that different loads can alter composition, molecular organization and morphological characteristics. Tendons present viscoelastic behavior and this characteristic is studied by biomechanical analyses and is directly related to tissu
Publicado em: 2007
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7. Influencia do tamanho de particulas no comportamento reologico da polpa de jabuticaba. / The influence of particles size on rheological behavior of jaboticaba pulp.
The influence of particle size on rheological behavior of jaboticaba pulp was evaluated in this study. Particle size distribution (PSD) of the pulp was evaluated using laser diffraction, which showed a monomodal distribution with mean diameter close to 330um. Jaboticaba pulp was centrifuged for serum separation. Particles were then separated through wet siev
Publicado em: 2005
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8. 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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9. Propriedades viscosas e viscoelasticas de soluções e geis de quitosana
The chitosan biopolymer has recently being appointed as an important source of matrices used as adsorbents in processes for the recovery and purification of bioproducts, with new applications in areas such as biotechnology. An important advantage is that chitin occurs naturally and is commonly found in crustacean shells. The flexibility exhibited by these ma
Publicado em: 2001
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10. Cytoskeletal Polymer Networks: Viscoelastic Properties are Determined by the Microscopic Interaction Potential of Cross-links
Although the structure of cross-linking molecules mainly determines the structural organization of actin filaments and with that the static elastic properties of the cytoskeleton, it is largely unknown how the biochemical characteristics of transiently cross-linking proteins (actin-binding proteins (ABPs)) affect the viscoelasticity of actin networks. In thi
The Biophysical Society.
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11. Analysis of flow-structure interaction in the larynx during phonation using an immersed-boundary method
A recently developed immersed-boundary method is used to model the flow-structure interaction associated with the human phonation. The glottal airflow is modeled as a two-dimensional incompressible flow driven by a constant subglottal pressure, and the vocal folds are modeled as a pair of three-layered, two-dimensional, viscoelastic structures. Both the flui
Acoustical Society of America.
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12. Viscoelasticity of living cells allows high resolution imaging by tapping mode atomic force microscopy.
Application of atomic force microscopy (AFM) to biological objects and processes under physiological conditions has been hampered so far by the deformation and destruction of the soft biological materials invoked. Here we describe a new mode of operation in which the standard V-shaped silicon nitride cantilever is oscillated under liquid and damped by the in