Flexural Rigidity
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Behavior of conventional glass fibers in matrix of Portland cement modified with latex and with the addition of silica fume. / Comportamento das fibras de vidro convencionais em matriz de cimento Portland modificada com látex e adição de sílica ativa.
Portland cement mortar and concrete are durable building materials, relatively cheap and, despite they display a good rigidity and an adequate compressive strength, they have other deficient properties such as tensile strength, impact, fatigue, beyond low toughness and ductility. A considerable improvement of these properties can be obtained adding fibers, i
Publicado em: 2002
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2. A influência da não-linearidade física do concreto armado na rigidez à flexão e na capacidade de rotação plástica. / The influence of physical non-linearity of the reinforced concrete on flexural rigidity and on plastic rotation capacity.
O presente trabalho é uma contribuição para o esclarecimento e a quantificação das influências na deformabilidade e na capacidade portante de elementos unidimensionais de concreto armado em solicitação plana, decorrentes da não-linearidade física dos materiais concreto e aço, bem como da fissuração e do enrijecimento da armadura tracionada, tamb
Publicado em: 2001
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3. Manipulation of individual viruses: friction and mechanical properties.
We present our results on the manipulation of individual viruses using an advanced interface for atomic force microscopes (AFMs). We show that the viruses can be dissected, rotated, and translated with great facility. We interpret the behavior of tobacco mosaic virus with a mechanical model that makes explicit the competition between sample-substrate lateral
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4. Cleavage planes in frog eggs are altered by strong magnetic fields
Early cleavages of Xenopus embryos were oriented in strong, static magnetic fields. Third-cleavage planes, normally horizontal, were seen to orient to a vertical plane parallel with a vertical magnetic field. Second cleavages, normally vertical, could also be oriented by applying a horizontal magnetic field. We argue that these changes in cleavage-furrow geo
The National Academy of Sciences.
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5. Mechanotransduction and flow across the endothelial glycocalyx
In this inaugural paper, we shall provide an overview of the endothelial surface layer or glycocalyx in several roles: as a transport barrier, as a porous hydrodynamic interface in the motion of red and white cells in microvessels, and as a mechanotransducer of fluid shearing stresses to the actin cortical cytoskeleton of the endothelial cell. These func
National Academy of Sciences.
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6. Mechanotransduction and strain amplification in osteocyte cell processes
A paradox in bone tissue is that tissue-level strains due to animal and human locomotion are too small to initiate intracellular chemical responses directly. A model recently was proposed to resolve this paradox, which predicts that the fluid flow through the pericellular matrix in the lacunar-canalicular porosity due to mechanical loading can induce strains
National Academy of Sciences.
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7. Characterization of beta-connectin (titin 2) from striated muscle by dynamic light scattering.
Connectin (titin) is a large filamentous protein (single peptide) with a molecular mass of approximately 3 MDa, contour length approximately 900 nm, and diameter approximately 4 nm, and resides in striated muscle. Connectin links the thick filaments to the Z-lines in a sarcomere and produces a passive elastic force when muscle fiber is stretched. The aim of
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8. A point mutation in the regulatory light chain reduces the step size of skeletal muscle myosin
Current evidence favors the theory that, when the globular motor domain of myosin attaches to actin, the light chain binding domain or “lever arm” rotates, and thereby generates movement of actin filaments. Myosin is uniquely designed for such a role in that a long α-helix (≈9 nm) extending from the C terminus of the catalytic core is stabilized by tw
National Academy of Sciences.