Locking Free
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. An efficient general curvilinear coordinates finite element method for the linear dynamic study of thickness-independent shells
Abstract yyTo date, a large number of finite element methods have been developed to study the dynamics of shell structures. Most of them are generally based on the degenerated solid approach and other less in shell theories, but introducing, in this last case, some assumptions to analyze this problem: some of them refer to shallow shells (slightly curved she
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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2. A Stabilized Hybrid Discontinuous Galerkin Method for Nearly Incompressible Linear Elasticity Problem
RESUMO Neste trabalho, um método de elementos finitos híbrido primal para o problema de elasticidade linear quase incompressível em malhas triangulares é mostrado. Este método consiste no acomplamento de problemas de Galerkin descontínuos locais para a variável primal com um problema global para o multiplicador de Lagrange, o qual é identificado como
TEMA (São Carlos). Publicado em: 2017-12
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3. A New Triangular Hybrid Displacement Function Element for Static and Free Vibration Analyses of Mindlin-Reissner Plate
Abstract A new 3-node triangular hybrid displacement function Mindlin-Reissner plate element is developed. Firstly, the modified variational functional of complementary energy for Mindlin-Reissner plate, which is eventually expressed by a so-called displacement function F, is proposed. Secondly, the locking-free formulae of Timoshenko’s beam theory are cho
Lat. Am. j. solids struct.. Publicado em: 2017-06
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4. An Explicit Stiffness Matrix for Parabolic Beam Element
Abstract This study is devoted to strain-based formulation for a curved beam. Arches with parabolic geometry, which have a variety of applications, belong to this structural type. Dependency of the curvature radius to the arch length creates some complexities in the solution process. To analyze these complex structures, a two-node beam with six degrees of fr
Lat. Am. j. solids struct.. Publicado em: 2016-09
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5. Finite element modeling for buckling analysis of hybrid piezoelectric beam under electromechanical loads
A one-dimensional finite element model for buckling analysis of hybrid piezoelectric beams under electromechanical load is presented in this work. The coupled zigzag theory is used for making the model. The inplane displacement is approximated as a combination of a global third order variation across the thickness with an additional layer wise linear variati
Lat. Am. j. solids struct.. Publicado em: 2014-10
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6. Active vibration control of a piezoelectric beam using PID controller: Experimental study
Vibration suppression of smart beams using the piezoelectric patch structure is presented in the present work. The smart system consists of a beam as the host structure and piezoceramic patches as the actuation and sensing elements. An experimental set-up has been developed to obtain the active vibration suppression of smart beam. The set-up consists of a sm
Lat. Am. j. solids struct.. Publicado em: 2012-12
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7. Tecnologia e humanismo : um estudo sobre o paradigma institucional e a prÃtica pedagÃgica no curso de tecnologia em processos ambientais da UTFPR / Technology and humanism : a study on the practical institution paradigm and the pedagogical one in the course of technology in ambient processes of the UTFPR
The main problem that guided this work was about the necessity of integration between technology and humanism in technology education. To precede this research we had as object of study the course of technology in environmental processes, at UTFPR. To analyze better our object we started to base the theoretical reference in Gramsci, his concept about the man
Publicado em: 2007
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8. A locking mechanism preventing radical damage in the absence of substrate, as revealed by the x-ray structure of lysine 5,6-aminomutase
Lysine 5,6-aminomutase is an adenosylcobalamin and pyridoxal-5′-phosphate-dependent enzyme that catalyzes a 1,2 rearrangement of the terminal amino group of dl-lysine and of l-β-lysine. We have solved the x-ray structure of a substrate-free form of lysine-5,6-aminomutase from Clostridium sticklandii. In this structure, a Rossmann domain covalently binds p
National Academy of Sciences.
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9. Conformational changes in switch I of EF-G drive its directional cycling on and off the ribosome
We have trapped elongation factor G (EF-G) from Escherichia coli in six, functionally defined states, representing intermediates in its unidirectional catalytic cycle, which couples GTP hydrolysis to tRNA–mRNA translocation in the ribosome. By probing EF-G with trypsin in each state, we identified a substantial conformational change involving its conserved
Nature Publishing Group.
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10. The challenge of paleoecological stasis: reassessing sources of evolutionary stability.
The paleontological record of the lower and middle Paleozoic Appalachian foreland basin demonstrates an unprecedented level of ecological and morphological stability on geological time scales. Some 70-80% of fossil morphospecies within assemblages persist in similar relative abundances in coordinated packages lasting as long as 7 million years despite eviden