Visco-elastic regularization and strain softening

In this paper it is intended to verify the capacity of regularization of the numerical solution of an elasto-plastic problem with linear strain softening. The finite element method with a displacement approach is used. Drucker-Prager yield criteria is considered. The radial return method is used for the integration of the elasto-plastic constitutive relations. An elastovisco- plastic scheme is used to regularize the numerical solution. Two constitutive laws have been developed and implemented in a FE-program, the first represent the radial return method applied to Drucker-Prager yield criteria and the second is a time integration procedure for the Maxwell visco-elastic model. Attention is paid to finite deformations. An associative plastic flow is considered in the Drucker-Prager elasto-plastic model. The algorithms are tested in two problems with softening. Figures showing the capability of the algorithms to regularize the solution are presented

Gluon mass at finite temperature in Landau gauge

Using lattice results for the Landau gauge gluon propagator at finite temperature, we investigate its interpretation as a massive type bosonic propagator. In particular, we estimate a gluon mass from Yukawa-like fits to the lattice data and study its temperature dependence.Comment: 7 pages, 5 figures, talk presented at the 31st International Symposium on Lattice Field Theory, July 29 - August 3, 2013, Mainz, German

Landau gauge fixing on the lattice using GPU's

In this work, we consider the GPU implementation of the steepest descent method with Fourier acceleration for Laudau gauge fixing, using CUDA. The performance of the code in a Tesla C2070 GPU is compared with a parallel CPU implementation.Comment: 3 pages, 1 figure, Proceedings of the Xth Quark Confinement and the Hadron Spectrum, 8-12 October 2012, TUM Campus Garching, Munich, German

Landau Gauge Fixing on GPUs and String Tension

We explore the performance of CUDA in performing Landau gauge fixing in Lattice QCD, using the steepest descent method with Fourier acceleration. The code performance was tested in a Tesla C2070, Fermi architecture. We also present a study of the string tension at finite temperature in the confined phase. The string tension is extracted from the color averaged free energy and from the color singlet using Landau gauge fixing.Comment: 7 pages, 4 figures, 1 table. Contribution to the International Meeting "Excited QCD", Peniche, Portugal, 06 - 12 May 201

Gluons at finite temperature

The gluon propagator is investigated at finite temperature via lattice simulations. In particular, we discuss its interpretation as a massive-type bosonic propagator. Moreover, we compute the corresponding spectral density and study the violation of spectral positivity. Finally, we explore the dependence of the gluon propagator on the phase of the Polyakov loop

Sound synchronization of bubble trains in a viscous fluid : Experiment and modeling

Acknowledgements: We thank the São Paulo State Agency FAPESP and the Federal Brazilian Agency CNPq for the financial support. M.S.B. acknowledges EPSRC Grant No. EP/IO32606/1.Peer reviewedPublisher PD

O desempenho acadêmico e o fenômeno da evasão em cursos de graduação da área da saúde

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ceilândia, Programa de Pós-Graduação em Ciências e Tecnologias em Saúde, 2016.O presente estudo tem como tema central o fenômeno da evasão e a variável desempenho acadêmico nos cursos de graduação da Universidade de Brasília Campus Ceilândia – UnB/ Ceilândia. Objetivo: Analisar o fenômeno da evasão em cinco cursos de graduação da área da saúde da UnB/Ceilândia, no período de 2008/2 a 2014/2 e implementar estratégia de intervenção para melhoria do desempenho acadêmico em quatro disciplinas iniciais do módulo modo de vida nos dois semestres de 2015. Método: O estudo é exploratório e descritivo, com delineamento de estudo de caso de natureza qualitativa, sobre evasão nos cursos - Enfermagem, Farmácia, Terapia Ocupacional, Saúde Coletiva e Fisioterapia, desta instituição, no período de 2008/2 a 2014/2, por meio de entrevista e a realização de minicurso para alunos monitores das disciplinas: Do Átomo a Vida; Da Célula aos Sistemas; Biofísica e Química Inorgânica Aplicada a Farmácia em 2015/1 e 2015/2. Resultados: Perfil do aluno, que evade dessa universidade, é do sexo feminino na faixa etária de 16 aos 20 anos tendo como principais causas de saída o abandono do ensino superior 25%; a mudança de curso 24%; ou, o desempenho acadêmico 16%. A taxa de evasão nos semestres de 2013/1 a 2014/2 foram 65,7%, 53,4%, 56% e 27,9%, respectivamente. Em relação à intervenção no sistema de monitoria das disciplinas: nos dois semestres de 2015, verificou-se aumento de 31% nas participações nessa atividade de um semestre para outro, e mais de 70% dos alunos obtiveram desempenho satisfatório. Conclusão: Os elementos evidenciados aqui sinalizam para a necessidade dos gestores institucionais aperfeiçoarem o sistema de monitoria de torná-lo mais atrativo principalmente para os alunos com baixo desempenho acadêmico, e assim tentar reduzir a evasão por baixo desempenho acadêmico.This study is focused on the dropout phenomenon and the variable academic performance in undergraduate courses at the University of Brasilia Ceilandia Campus - UNB / Ceilândia. Objective: To analyze the dropout phenomenon in five undergraduate courses in the health area, UNB / Ceilandia, from 2008/2 to 2014/2 and implement intervention strategies to improve the academic performance in the first four disciplines of living module in two semesters of 2015. Method: The study is exploratory and descriptive, study design case of a qualitative nature, about evasion in courses - Nursing, Pharmacy, Occupational Therapy, Physiotherapy and Public Health, this institution, from 2008 / 2 to 2014/2, and a short course for monitors students from disciplines from Atom Life; Cell to systems; Biophysics and Chemistry Applied Inorganic Pharmacy in 2015/1 and 2. Results: Student profile, which evades the university, are women aged 16 to 20 years and the main output causes the abandonment of higher education 25%; course change to 24%; or academic performance 16%. The dropout rates in the half of 2013/1 to 2014/2 were 65.7%, 53.4%, 56% and 27.9%, respectively. Regarding the intervention of the subjects monitoring system: in two half of 2015, 31% increase was found in the participation in this activity from one half to another, and more than 70% of students achieved satisfactory performance. Conclusion: The elements identified here point to the need for institutional managers hone the monitoring system to make it more attractive especially for students with low academic performance, so try and reduce dropout by low academic performance

Hamster: um rato simples

Este artigo descreve o agente robótico Hamster participante no concurso Ciber-Rato 2002 integrado no Festival Nacional de Robótica 2002. Este robô utiliza um algoritmo que, apesar da sua simplicidade apresenta uma eficiência razoável