Evolution Equations
Mostrando 1-12 de 124 artigos, teses e dissertações.
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1. Scaling Symmetries and Conservation Laws for Variable-coefficients Nonlinear Dispersive Equations
RESUMO. Simetrias de escala surgem em diferentes ramos da física e abordagens baseadas em simetria são poderosas ferramentas para estudar modelos invariantes por escala, pois podem fornecer leis de conservação que não são óbvias por inspeção. Nessa perspectiva, a classe de equações dispersivas não-lineares com coeficientes variáveis vc K ( m ,
TEMA (São Carlos). Publicado em: 13/12/2019
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2. Modelling beef cattle production systems from the Pampas in Brazil to assess intensification options
ABSTRACT Traditional livestock productivity is hard to estimate, since it depends on a gamut of animal production indicators that are difficult to measure for many farms. Thus, we propose an analytical method for estimating productivity and understanding the importance of animal production indicators under different full-cycle cattle production systems in Br
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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3. Two-dimensional Boussinesq equations applied to channel flows: deducing and applying the equations
RESUMO Uma das hipóteses básicas adotada para a formulação teórica dos escoamentos de fluidos é a distribuição da pressão hidrostática na vertical. No entanto, muitos pesquisadores apontaram que essa simplificação pode levar a erros, em casos como o escoamento na ruptura de barragens. A discrepância entre a solução computacional e o experiment
RBRH. Publicado em: 25/04/2019
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4. Comparison of semi and fully-implicit time integration schemes applied to a damage and fatigue phase field model
Abstract In this work, we apply semi and fully-implicit time integration schemes to the damage and fatigue phase field presented in Boldrini et al. (2016). The damage phase field is considered a continuous dynamic variable whose evolution equation is obtained by the principle of virtual power. The fatigue phase field is a continuous internal variable whose
Lat. Am. j. solids struct.. Publicado em: 14/06/2018
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5. Numerical Analysis of Swirl Effects on Conical Diffuser Flows
ABSTRACT: The present paper focuses on the effect of swirl on important parameters of conical diffusers flows such as static pressure evolution, recirculation zones and wall shear stress. Governing equations are solved using a software based on the finite volume method. Moreover, turbulence effects are taken into account employing the k-ε RNG model with an
J. Aerosp. Technol. Manag.. Publicado em: 2017-03
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6. Performance in the 6-minute walk test and postoperative pulmonary complications in pulmonary surgery: an observational study
OBJECTIVES: To assess functional capacity in the preoperative phase of pulmonary surgery by comparing predicted and obtained values for the six-minute walk test (6MWT) in patients with and without postoperative pulmonary complication (PPC) METHOD: Twenty-one patients in the preoperative phase of open thoracotomy were evaluated using the 6MWT, followed by
Braz. J. Phys. Ther.. Publicado em: 19/01/2016
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7. Simulation of the Microstructural Evolution of Pure Material and Alloys in an Undercooled Melts via Phase-field Method and Adaptive Computational Domain
The phase-field methods were developed mainly for studying solidification of pure materials, being then extended to the solidification of alloys. In spite of phase-field models being suitable for simulating solidification processes, they suffer from low computational efficiency. In this study, we present a numerical technique for the improvement of computati
Mat. Res.. Publicado em: 2015-06
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8. Damage based constitutive model for predicting the performance degradation of concrete
An anisotropic elastic-damage coupled constitutive model for plain concrete is developed, which describes the concrete performance degradation. The damage variable, related to the surface density of micro-cracks and micro-voids, and represented by a second order tensor, is governed by the principal tension strain components. For adequately describing the par
Lat. Am. j. solids struct.. Publicado em: 2014-11
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9. A review on some results on local conservation laws for certain evolution equations
Neste trabalho revisitamos alguns resultados recentes sobre leis de conservação de uma classe de equações evolutivas até quinta ordem.
TEMA (São Carlos). Publicado em: 2013-04
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10. Experimental analysis and theoretical predictions of the limit strains of a hot-dip galvanized interstitial-free steel sheet
In this work, the formability of a hot-dip galvanized interstitial-free (IF) steel sheet was evaluated by means of uniaxial tensile and Forming Limit Curve (FLC) tests. The FLC was defined using the flat-bottomed Marciniak's punch technique, where the strain analysis was made using a digital image correlation software. A plastic localization model was also p
Mat. Res.. Publicado em: 08/02/2013
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11. Uma análise do emprego no setor da construção civil nos estados do nordeste brasileiro: qualidade do emprego formal e o retorno da educação
The Construction Industry has gained prominence on the national scene due to its ability to generate employment, and absorb much of the disqualified labor. On that perspective, this research aims to measure the quality of formal employment and quantify the impact of schooling on income of Construction Industry workers in the states of Northeast Brazil. In or
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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12. Ondas gravitacionais e o espectro de anisotropia tensorial na presença de neutrinos cosmológicos
In this work we have studied the evolution of primordial gravitational waves coupled to anisotropic stress tensor of cosmological neutrinos. As in a radiation dominated universe, in a universe dominated by radiation and matter the neutrinos can work as an effective dispersive medium for the gravitational waves, besides introduce small modifications over the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2012