Structural Instability
Mostrando 1-12 de 177 artigos, teses e dissertações.
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1. Sunlight-Driven Dehydrogenative Oxidation Photocatalysis by a Mononuclear Complex Acting as both Chromophore and Catalyst
Under simulated solar irradiation in the visible spectral region, the catalytically active RuIV-oxo species [Ru(O)(bpy)(tppz)]2+ (tppz = tetrapyridylpyrazine, a strongly π-accepting tridentate N, N, N-ligand) is produced directly from a single metal-to-ligand charge-transfer (MLCT) photoexcitation of the resting RuII-aquo complex [Ru(H2O)(bpy)(tppz)]2+ in a
J. Braz. Chem. Soc.. Publicado em: 2020-11
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2. A methodology to investigate the influence of the fillet radius on the buckling of integrally stiffened panels
Abstract The use of integrally stiffened panels (ISP's) in wings of small and medium-sized aircraft is frequent in aviation. These thin-walled structures are often subjected to compressive loads during their life-time and, although the finite element method has become an important tool for engineers to obtain the buckling load of structural members, some res
Lat. Am. j. solids struct.. Publicado em: 22/07/2019
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3. FE Modeling and Seismic Performance Evaluation of Hybrid SMA-Steel RC Beam-Column Joints
Abstract Severe permanent deformations of buildings during earthquakes have been found as one of the major causes of the instability and failure of structures. The application of superelastic Shape Memory Alloy rebars at the plastic hinge region of reinforced concrete beam-column joints (SESMA-BCJs) can eliminate the seismic residual deformations. Such self-
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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4. Numerical fundamentals and interactive computer graphics system for the nonlinear analysis of planar frames
Abstract Recent scientific and computational advances have facilitated the analysis of slender structural systems subject to instability. With the employment of more sophisticated numerical tools and algorithms, it is possible to accurately determine the critical points (limit and bifurcation loads) as well as the post-critical behavior of the structural sys
REM, Int. Eng. J.. Publicado em: 2019-06
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5. Financial liberalization and structural change: the Brazilian case in the 2000s
Resumo A partir de uma abordagem Minsky-Kregel, este paper discute a relação entre integração financeira e mudança estrutural. Ou seja, a abertura da economia brasileira nos anos 1990 não gerou a mudança estrutural capaz de elevar o peso dos setores de maior conteúdo tecnológico na indústria de transformação. Assume-se que a liberalização finan
Econ. soc.. Publicado em: 29/04/2019
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6. Factors associated with the structural liquidity of banks in Brazil
RESUMO O trabalho teve por fim identificar a relação do índice de liquidez estrutural (ILE) com variáveis macroeconômicas, características dos bancos e vigência do Acordo de Basileia III. Embora a discussão acadêmica sobre liquidez bancária aborde essencialmente questões de curto prazo, o monitoramento da liquidez de longo prazo permite avaliar a
Rev. contab. finanç.. Publicado em: 18/02/2019
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7. Arrhythmogenic Right Ventricular Cardiomyopathy/Dysplasia (ARVC/D) - What We Have Learned after 40 Years of the Diagnosis of This Clinical Entity
Resumo A cardiomiopatia/displasia arritmogênica do ventrículo direito (C/DAVD) foi inicialmente reconhecida como uma entidade clínica por Fontaine e Marcus que avaliaram um grupo de pacientes com taquiarritmia ventricular proveniente de um ventrículo direito (VD) estruturalmente comprometido. Desde então, houve avanços significativos na compreensão da
Arq. Bras. Cardiol.. Publicado em: 2019-01
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8. Human papillomavirus and genome instability: from productive infection to cancer
Infection with high oncogenic risk human papillomavirus types is the etiological factor of cervical cancer and a major cause of other epithelial malignancies, including vulvar, vaginal, anal, penile and head and neck carcinomas. These agents affect epithelial homeostasis through the expression of specific proteins that deregulate important cellular signaling
Clinics. Publicado em: 06/09/2018
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9. Comparative study of tall building response to synoptic and non-synoptic wind action
Abstract Until the beginning of the 21st Century, the characteristics of wind for purposes of structural analysis and design, as reflected in wind codes worldwide, were based on the behavior of wind currents in the vicinity of the ground surface observed in so-called synoptic events. It was only recently recognized that the latter are not the only cause of w
REM, Int. Eng. J.. Publicado em: 2018-07
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10. Structural and Photoacoustic Study of Cr11Ge19 Prepared by Mechanical Alloying
A nanostructured Cr11Ge19 phase was produced by mechanical alloying for 15 h. Decomposition occurred for larger milling times, yielding Cr, Ge, Cr2O3 and GeO2. According to the Cr-Ge phase diagram, the Cr11Ge19 phase is stable up to ≈ 928 oC, but, when submitted to milling, a structural instability causes its decomposition. We studied this structural insta
Mat. Res.. Publicado em: 22/06/2017
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11. Effect of Uniformly Distributed Tangential Follower Force on the Stability of Rotating Cantilever Tube Conveying Fluid
Abstract In this paper, the Euler-Bernoulli beam model is used to predict the structural instability of rotating cantilever tubes conveying fluid and subjected to uniform distributed tangential compressive load. The governing equation of motion and boundary conditions of the system are derived using the Hamilton's principle. Then, Galerkin method is applied
Lat. Am. j. solids struct.. Publicado em: 2016-02
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12. Nonlinear Equilibrium and Stability Analysis of Axially Loaded Piles Under Bilateral Contact Constraints
AbstractThis paper presents a nonlinear stability analysis of piles under bilateral contact constraints imposed by a geological medium (soil or rock). To solve this contact problem, the paper proposes a general numerical methodology, based on the finite element method (FEM). In this context, a geometrically nonlinear beam-column element is used to model the
Lat. Am. j. solids struct.. Publicado em: 2015-04