Dynamic Instability
Mostrando 1-12 de 140 artigos, teses e dissertações.
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1. Severe Dizziness Related to Postural Instability, Changes in Gait and Cognitive Skills in Patients with Chronic Peripheral Vestibulopathy
Abstract Introduction Peripheral vestibular disorders can lead to cognitive deficits and are more common in elderly patients. Objective To evaluate and correlate cognitive, balance and gait aspects in elderly women with chronic peripheral vestibular dizziness, and to compare them with elderly women without vestibular disorders. Methods Twenty-two wome
Int. Arch. Otorhinolaryngol.. Publicado em: 2020-03
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2. IMAGE CORRELATION BETWEEN FACET EFFUSION AND LUMBAR INSTABILITY
RESUMO Objetivo Avaliar a incidência de líquido facetário na ressonância magnética (RNM) de coluna lombossacra e a relação com instabilidade segmentar radiográfica em pacientes submetidos à cirurgia da coluna vertebral. Métodos Coorte retrospectivo de pacientes submetidos à cirurgia da coluna lombossacra, em um período de três anos, através d
Coluna/Columna. Publicado em: 02/09/2019
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3. Uma tentativa de integração entre Keynes e Kalecki: investimento e dinâmica
RESUMO Keynes e Kalecki foram os precursores dos modelos de dinâmica baseados no Princípio da Demanda Efetiva e atribuíram ao investimento papel central para aquela. Kalecki retrata uma dinâmica cíclica regular associada ao efeito dual e defasado do investimento. Já o modelo de Keynes descreve uma dinâmica potencialmente instável, resultado das decis
Brazil. J. Polit. Econ.. Publicado em: 02/09/2019
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4. Moderating effect of economic instability in the relationship between concentration of control and market value: empirical evidence in Latin America
RESUMO Este artigo investiga o efeito moderador da instabilidade econômica na relação entre a concentração de controle e o valor de mercado da empresa. Com tal objetivo, constrói-se um painel não balanceado composto por 341 companhias latino-americanas de seis países: Argentina, Brasil, Chile, Colômbia, México e Peru. Os resultados dos modelos din�
BBR, Braz. Bus. Rev.. Publicado em: 19/08/2019
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5. Scale effect on mean pressures: study of two reduced models of a ski jump spillway
RESUMO O vertedouro tipo salto esqui está presente em grandes barragens brasileiras. Após a operação desse tipo de vertedouro se origina uma fossa de erosão a jusante, que complementa o sistema de dissipação de energia, pois o jato é amortecido pelo colchão d’água. À medida que a escavação da fossa de erosão evolui, sua forma se altera, haven
RBRH. Publicado em: 01/07/2019
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6. Effect of Processing Parameters on Hot Deformation Behaviour and Microstructural Evolution of PM Ti-5553 Alloy at a Moderate-high Strain Rate
Isothermal compression tests of Ti-5553 (Ti-5Al-5V-5Mo-3Cr) alloy, produced by a fast consolidation approach from blended elemental powder mixture, were performed on a Gleeble® 3800 thermal-physical simulator to investigate its hot deformation behaviour. The samples were compressed in a wide temperature range from 700 ºC to 1150 ºC and a moderate-high str
Mat. Res.. Publicado em: 10/06/2019
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7. Monitoring of Sobradinho landslide (Brasília, Brazil) and a prototype vertical slope by time-lapse interferometry
Abstract The application of geophysical monitoring technologies may offer an opportunity to understand the dynamic of slopes in response to factors triggering their instability. In this study, Ambient Noise Interferometry was used as a monitoring approach on a man-made reduced-scale vertical slope and on a natural-scale landslide in Sobradinho (Brazil), unde
Braz. J. Geol.. Publicado em: 03/06/2019
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8. GFEM STABILIZATION TECHNIQUES APPLIED TO DYNAMIC ANALYSIS OF NON-UNIFORM SECTION BARS
Abstract The Finite Element Method (FEM), although widely used as an approximate solution method, has some limitations when applied in dynamic analysis. As the loads excite the high frequency and modes, the method may lose precision and accuracy. To improve the representation of these high-frequency modes, we can use the Generalized Finite Element Method (GF
Lat. Am. j. solids struct.. Publicado em: 29/10/2018
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9. Investigation of dynamic instability of three plates switch under step DC voltage actuation using modified couple stress theory
Abstract In this paper dynamical instability of three-layer micro-switch under DC voltage actuation has been studied. Recent studies have used the classical beam theory while leaving out the length scale parameter. In this paper dynamic behavior of the switch has been investigated based on couple stress theory and considering the length scale parameter. To t
Lat. Am. j. solids struct.. Publicado em: 10/07/2018
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10. High Temperature Plastic Instability and Dynamic Strain Aging in the Tensile Behavior of AISI 316 Stainless Steel
The plastic instability in the stress-strain curve and work hardening of a type AISI 316 austenitic stainless steel was investigated in the high temperature range of 150°C to 800°C for two strain rates. The results indicate the occurrence of plastic instability and serrations between 200°C and 650°C with peaks in both the tensile strength and work harden
Mat. Res.. Publicado em: 23/10/2017
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11. Analysis of the Dynamic Behavior of a Rotating Composite Hollow Shaft
Abstract In the present paper, a simplified homogenized beam theory is used in the context of a numerical investigation regarding the dynamic behavior of a rotating composite hollow shaft. For this aim, a horizontal flexible composite shaft and a rigid disc form the considered simple supported rotating system. The mathematical model of the rotor is derived f
Lat. Am. j. solids struct.. Publicado em: 2017-01
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12. Dynamic Instability of Beams Under Tip Follower Forces Using Geometrically Exact, Fully Intrinsic Equations
Abstract In this study, the dynamic instability of beams under tip follower forces are considered. The beam is modeled by using the geometrically exact, fully intrinsic beam equations which is subjected to an inclined tip follower force. Generalized differential quadrature method is employed to solve the governing equations. The effect of different parameter
Lat. Am. j. solids struct.. Publicado em: 2016-12