Laboratorio Nacional Of Computacao


Laboratorio Nacional Of Computacao

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Guterres A.,Instituto Oswaldo Cruz | Guterres A.,Laboratorio Nacional Of Computacao | de Oliveira R.C.,Instituto Oswaldo Cruz | Fernandes J.,Instituto Oswaldo Cruz | And 11 more authors.
Infection, Genetics and Evolution | Year: 2013

The purpose of this study was to investigate the phylogenetic relationship of the Juquitiba virus (JUQV) carried by Oligoryzomys nigripes in endemic and non-endemic areas of Brazil. Wild rodents infected with the Juquitiba virus (JUQV) were sampled from a non-Hantavirus Cardiopulmonary Syndrome endemic area in Brazil. Three strains from O. nigripes were identified by the sequencing of the complete S segment and compared to previous studies of JUQV available in GenBank. The phylogenetic analysis of the complete S segment revealed two distinct clades; the first clade was composed of the JUQV from two non-endemic areas in Brazil and the second clade contained JUQV strains from Argentina, Paraguay and other Brazilian endemic areas. © 2013 .

Zhu J.,Laboratorio Nacional Of Computacao | Yu X.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Loula A.F.D.,Laboratorio Nacional Of Computacao
Computer Methods in Applied Mechanics and Engineering | Year: 2011

A stabilized mixed discontinuous Galerkin (SMDG) method based on Brezzi-Hughes-Marini-Masud [F. Brezzi, T.J.R. Hughes, L.D. Marini, A. Masud, Mixed discontnuous Galerkin methods for Darcy flow, J. Sci. Comput. 22 (2005) 119-145.] is proposed to solve a thermally coupled nonlinear elliptic system modeling a large class of engineering problems. A fixed point algorithm is adopted to solve the nonlinear systems. Convergence analysis and error estimates are presented for equal order linear or bilinear discontinuous Lagrangian finite element interpolations for all fields. Numerical results are presented confirming the predicted convergence rates and illustrating the performance of the proposed formulation solving problems with globally stable and blowing up solutions. © 2010 Elsevier B.V.

Novotny A.A.,Laboratorio Nacional Of Computacao | Sokolowski J.,University of Lorraine | Zochowski A.,Polish Academy of Sciences
2010 15th International Conference on Methods and Models in Automation and Robotics, MMAR 2010 | Year: 2010

We consider an elastic body with a rigid inclusion and a crack located at the boundary of the inclusion [11]. It is assumed that non-penetration conditions are imposed at the crack faces which do not allow the opposite crack faces to penetrate each other. The differentiability of the elastic energy with respect to the crack length, for the crack located at the boundary of rigid inclusion, is established [11]. ©2010 IEEE.

Giusti S.M.,CONICET | Novotny A.A.,Laboratorio Nacional Of Computacao
Mechanics Research Communications | Year: 2015

In this work the topological derivative concept is applied in the context of topology design of thermo-mechanical devices, where the linear elasticity system (modeled by the Navier equation) is coupled with the steady-state heat conduction problem (modeled by the Laplace equation). The mechanical coupling term comes out from the thermal stress induced by the temperature field. We consider the topology design of bi-metallic devices. The idea is to maximize the displacement in a given direction defined on the boundary of the thermo-elastic body with respect to a bi-metallic material distribution. The topological derivative is obtained by considering the nucleation of a small circular inclusion with different thermal expansion coefficients. A level-set domain representation method is used, together with the derived topological sensitivity formula, to devise a topology design algorithm. Finally, some numerical experiments regarding the conceptual design of thermo-mechanical devices are presented. © 2015 Elsevier Ltd. All rights reserved.

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