Structural Determination
Mostrando 13-24 de 615 artigos, teses e dissertações.
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13. The Academic Self-Regulation Questionnaire: a study with Portuguese elementary school children
Abstract Background: Several studies have focused on the assessment of students' motivation because this construct is very important to understand students' learning and how to enhance it. The Academic Self-Regulation Questionnaire (SRQ-A), based on the self-determination theory is a self-report instrument developed to access the reasons why students do the
Psicol. Reflex. Crit.. Publicado em: 20/05/2019
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14. Structural Validity of the School Aspirations Questionnaire (SAQ)
Resumo A teoria da autodeterminação afirma que três necessidades básicas (autonomia, vínculo e competência) norteiam a motivação humana. Muitos instrumentos psicológicos têm como base esta teoria. No entanto, nenhum distingue as percepções de ocorrência das necessidades básicas, e o quanto estas necessidades são valorizadas. O Questionário de
Psic.: Teor. e Pesq.. Publicado em: 25/04/2019
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15. Chemical modification of in natura collagen by acidic catalysis – structural characterization and mechanistic features of Cd(II) sorption by solution microcalorimetry
ABSTRACT Chemically-modified in natura collage was prepared under acidic catalysis for using in sorption of Cd(II) from aqueous solutions. Simultaneous determination of the quantity and energetic parameters of Cd(II) sorption on PGA-scale at pH 8.0 were determined using solution microcalorimetry (SM). The calorimetric enthalpies of Cd(II) sorption on PGA-sca
Matéria (Rio J.). Publicado em: 06/12/2018
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16. Investigation on influence of stamp forming parameters on formability of thermoplastic composite
Abstract Advanced fabric reinforced polymer composites find extensive applications in aerospace and structural fields due to their high mechanical properties. A novel stamp forming technique finds extensive use in the hemispherical forming of thermoplastic composites. This study investigates the influence of stamp forming parameters on the formability of th
Polímeros. Publicado em: 29/11/2018
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17. Optimal design of beam-column connections of plane steel frames using the component method
Abstract This paper presents a methodology for optimization of beam-column connections of plane steel frames. The objective is to obtain beam- column connections mechanically more efficient and with minimum cost by determination of the optimal dimensions for the components of the connection; satisfying mechanical constraints associated with the bending momen
Lat. Am. j. solids struct.. Publicado em: 29/10/2018
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18. The Motivation to Participate in Citizen-Sourcing and Hackathons in the Public Sector
Abstract Key challenges of how citizens can be motivated to participate in citizen-sourcing initiatives remain unaddressed. In this paper, we identified the influence of eight motivation variables in the number of participations in Hackathons, a citizen-sourcing initiative, in Brazil. We adapt different models from Self-Determination Theory and the Theory of
BAR, Braz. Adm. Rev.. Publicado em: 08/10/2018
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19. Optimization of reinforced concrete polygonal sections under biaxial bending with axial force
Abstract Concrete is the world’s most utilized material for production of the structural elements employed in civil construction. Due to its low tensile strength and brittle nature it is reinforced with steel bars forming the reinforced concrete (RC structure). Linear elements of reinforced concrete are commonly employed in multi-story buildings, bridges,
Lat. Am. j. solids struct.. Publicado em: 04/10/2018
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20. Determinación de la tenacidad a la fractura J en laminados fibra-metal del tipo CARALL con láminas de aluminio 6061 y 1050
ABSTRACT Determination of fracture toughness in hybrid composites, fiber-metal laminates, FML (Fiber Metal Laminates) is very important to perform an analysis of structural integrity to estimate damage tolerance and residual strength of the material against the propagation of a crack This evaluation should be done in both naval and aircraft structures using
Matéria (Rio J.). Publicado em: 19/07/2018
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21. Esfuerzo de corte en Interfaces Fe/Fe3O4
Abstract The mechanical stability of oxides formed on metallic alloys is a key concern in the determination of component susceptibility to the medium in contact and the applicability of the alloy to high temperatures and other extreme conditions. In this context, the energy of adhesion is a key parameter. Density functional Theory (DFT) and other atomistic m
Matéria (Rio J.). Publicado em: 19/07/2018
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22. Espuma ultraliviana de Mg a partir de viruta reciclada
ABSTRACT Hundreds of people worldwide die or are severely maimed in collisions during traffic accidents, due to the energy transmitted to the passengers on impact. A dissipation of said energy is necessary to minimize it's effects, which can be achieved through absorbers. In recent years, metallic foams have started to be considered as energy absorbers. Meta
Matéria (Rio J.). Publicado em: 19/07/2018
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23. Estudio del comportamiento en enfriamiento continuo del acero martensítico ferrítico de activación reducida F82H
ABSTRACT 9% Cr martensitic-ferritic steels are currently the privileged candidates to manufacture structural components of the so-called Generation IV nuclear fission reactors, because they exhibit very good thermophysical and mechanical properties under neutron irradiation. Along with them, the so-called Reduced Activation Ferritic-Martensitic steels (RAFM�
Matéria (Rio J.). Publicado em: 19/07/2018
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24. Anti-angiogenic activity of iridoids from Galium tunetanum
ABSTRACT The phytochemical study of Galium tunetanum Lam., Rubiaceae, leaves led to the isolation of 13 compounds from the chloroform–methanol and the methanol extracts, including six iridoid glycosides, one non-glycoside iridoid, two p-coumaroyl iridoid glycosides, two phenolic acids, and two flavonoid glycosides. The structural determination of the isola
Rev. bras. farmacogn.. Publicado em: 2018-06