Bifurcation Analysis
Mostrando 1-12 de 60 artigos, teses e dissertações.
-
1. NUMERICAL STUDY OF VISCOPLASTIC FLOW IN A T-BIFURCATION: IDENTIFICATION OF STAGNANT REGIONS
Abstract Identification of stagnant regions of viscoplastic fluid flows in production lines and equipment is of paramount importance owing to potential material degradation and process contamination. The present work introduces an assessment strategy to identify, classify and quantify unyielded regions with the objective of optimizing the flow conditions wit
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
-
2. 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
-
3. Nota sobre o sistema de parentesco em Proto-Tupí-Guaraní
Resumo Este estudo explora o sistema de terminologia de parentesco da língua Proto-Tupí-Guaraní (PTG) a partir de uma perspectiva interdisciplinar, que soma contribuições da Etnologia, da Linguística Histórica e dos trabalhos etnográficos realizados com povos Tupí-Guaraní. Fazem-se inferências sobre pré-história cultural utilizando métodos filo
Bol. Mus. Para. Emílio Goeldi. Ciênc. hum.. Publicado em: 29/04/2019
-
4. Simulación matemática para la optimización del patrón de flujo entregado por una buza para el molde de colada continua de planchón delgado
ABSTRACT Understanding the behavior of the oscillations of the jets into the mold of thin slab funnel is essential to ensure a constant supply of liquid steel, improve control of the flow patterns and consequently increase plant productivity and the final product quality. To achieve this, we conducted a study of the effect of the internal design of the nozzl
Matéria (Rio J.). Publicado em: 19/07/2018
-
5. Determination of Forming Limit Diagrams Based on Ductile Damage Models and Necking Criteria
Abstract In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified Gurson-Tvergaard-Needleman (GTN) damage model. To this end, both d
Lat. Am. j. solids struct.. Publicado em: 2017-10
-
6. Pattern Identification on the Nonlinear Radial Motion of an Oscillating Spherical Bubble Using Neural Networks
Abstract The main goal of this article is to study the oscillatory motion of a spherical gas bubble immersed in a Newtonian liquid subjected to a harmonic pressure excitation. We use the classical Rayleigh-Plesset equation to study the radial motion of the bubble undergoing a forcing acoustic pressure field. The second order nonlinear ordinary differential e
Lat. Am. j. solids struct.. Publicado em: 2016-12
-
7. A robust fully automatic lumen segmentation method for in vivo intracoronary optical coherence tomography
Abstract Introduction: Intravascular optical coherence tomography (IVOCT) is an in-vivo imaging modality based on the introduction of a catheter in a blood vessel for viewing its inner wall using electromagnetic radiation. One of the most developed automatic applications for this modality is the lumen area segmentation, however on the evaluation of these me
Res. Biomed. Eng.. Publicado em: 05/02/2016
-
8. Fracture initiation from initial spherical flaws in incompressible propellant materials
The scope of the present article is the study of the fracture initiation from initial spherical flaws in incompressible propellant materials. Using a constitutive law, derived from the neo-Hookean strain energy function, one may deduce the relation between the radial pressure applied at infinity and the corresponding extension ratio, at the surface of the ca
Matéria (Rio J.). Publicado em: 2015-06
-
9. Dinâmica não-linear e reagente limitante: um exemplo de bifurcação transcrítica
The nonlinear analysis of a general mixed second order reaction was performed, aiming to explore some basic tools concerning the mathematics of nonlinear differential equations. Concepts of stability around fixed points based on linear stability analysis are introduced, together with phase plane and integral curves. The main focus is the chemical relationshi
Quím. Nova. Publicado em: 2014
-
10. Caste polymorphism of apterous line of the Neotropical termite Nasutitermes corniger (Motschulsky) (Isoptera, Termitidae)
Termite societies are structured by individuals that can be grouped into castes and instars. The development of these instars in most species occurs in irregular patterns and sometimes is distinguished subcastes in physical systems that originate polymorphic soldiers and workers. In this study, we characterized the morphological diversity of castes of aptero
Rev. Bras. entomol.. Publicado em: 20/09/2013
-
11. Non-linear dynamics of a hanging rope
Two-dimensional motion of a hanging rope is considered. A multibody system with elastic-dissipative joints is used for modelling of the rope. The mathematical model based on the Lagrange formalism is presented. Results of some numerical simulations are shown for the mechanical system with kinematic excitation. Basic tools are used to qualify dynamics of the
Lat. Am. j. solids struct.. Publicado em: 2013-01
-
12. Achados ultrassonográficos em lesões de bifurcação coronária tratadas com stent único versus estratégia com dois stents / Intravascular ultrasound findings in coronary bifurcation lesions treated with single stenting versus double stenting strategies
Previous comparative studies including selected bifurcation lesions have shown no advantage of elective double stenting implantation versus single stenting. However, the applicability of the provisional technique appears to be dependent on the bifurcation lesion complexity. The lesion luminal area after percutaneous treatment, as assessed by intravascular ul
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011