The non-ideal problem behavior using a dynamic vibration absorber with nonlinear essential stiffness and timedependent damping properties

The purpose of this study is to develop a dynamic vibration absorber using viscoelastic material with nonlinear essential stiffness and time-dependent damping properties for a non-ideal vibrating system with Sommerfeld effect, resonance capture, and jump phenomenon. The absorber is a mass-bar subsystem that consists of a viscoelastic bar with memory attached to mass, in which the internal dissipative forces depend on current, deformations, and its operational frequency varies with limited temperature. The non-ideal vibrating system consists of a linear (nonlinear) oscillator (plane frame structure) under excitation, via spring connector, of a DC-motor with limited power supply. A viscoelastic dynamic absorber modeled with elastic stiffness essentially nonlinearities was developed to further reduce the Sommerfeld effect and the response of the structure. The numerical results show the performance of the absorber on the non-ideal system response through the resonance curves, time histories, and Poincarésections. Furthermore, the structure responses using the viscoelastic damper with and without memory were studied. © IMechE 2012.

Three-dimensional transient complex free surface flows: Numerical simulation of XPP fluid

In this paper we present a finite difference MAC-type approach for solving three-dimensional viscoelastic incompressible free surface flows governed by the eXtended Pom-Pom (XPP) model, considering a wide range of parameters. The numerical formulation presented in this work is an extension to three-dimensions of our implicit technique [Journal of Non-Newtonian Fluid Mechanics 166 (2011) 165-179] for solving two-dimensional viscoelastic free surface flows. To enhance the stability of the numerical method, we employ a combination of the projection method with an implicit technique for treating the pressure on the free surfaces. The differential constitutive equation of the fluid is solved using a second-order Runge-Kutta scheme. The numerical technique is validated by performing a mesh refinement study on a pipe flow, and the numerical results presented include the simulation of two complex viscoelastic free surface flows: extrudate-swell problem and jet buckling phenomenon. © 2013 Elsevier B.V.

The fat body of termites: Functions and stored materials

The functions of the fat body in the different castes of termites, and accumulation of energy reserves, proteins and urates within this organ, are reviewed. The termite fat body is involved in multiple metabolic activities, including recycling of nitrogen. Termite fat body showed three different types of cells: adipocytes, urocytes and mycetocytes, the latter restricted to the species Mastotermes darwiniensis. Adipocytes synthesize and store lipids, glycogen and several proteins. These cells also elaborate important peptides, including some that act in immune processes. Urocytes are responsible for the storage of spherocrystals of urates, which vary quantitatively among the termite castes. The different metabolic functions of the fat body in the several castes and stages of termites are associated with specific adipocyte morphologies. The synthesis and storage of different compounds modify the structure of the fat body; this differentiation is coordinated by hormones involved with molting and reproductive cycles. © 2013 Elsevier Ltd.

A priori reformulations for joint rolling-horizon scheduling of materials processing and lot-sizing problem

In many production processes, a key material is prepared and then transformed into different final products. The lot sizing decisions concern not only the production of final products, but also that of material preparation in order to take account of their sequence-dependent setup costs and times. The amount of research in recent years indicates the relevance of this problem in various industrial settings. In this paper, facility location reformulation and strengthening constraints are newly applied to a previous lot-sizing model in order to improve solution quality and computing time. Three alternative metaheuristics are used to fix the setup variables, resulting in much improved performance over previous research, especially regarding the use of the metaheuristics for larger instances. © 2013 Elsevier Ltd. All rights reserved.

Relative growth, sexual maturity, and breeding season of three species of the genus Persephona (Decapoda: Brachyura: Leucosiidae): A comparative study

The relative growths of Persephona lichtensteinii, P. mediterranea, and P. punctata were investigated on the south-eastern Brazilian coast, focusing on differences in the growth rates between immature and mature phases, the onset of morphological sexual maturity, and the breeding seasons of these species. Crabs were collected every two months from January 1991 through to November 1992, from a shrimp fishing boat equipped with two otter-trawl nets. Significant differences in the patterns of body growth were observed between immature and mature phases of all three species. Changes in the growth rates of the chelipeds (males) and abdomen (females) observed for P. lichtensteinii, P. mediterranea, and P. punctata, seem to be related to the puberty moult for both sexes. Males of P. mediterranea and P. punctata reached larger mean sizes of carapace width than females, whereas no difference was recorded for P. lichtensteinii. The body size at which 50% of males attained sexual maturity was also larger in P. mediterranea and P. punctata, and smaller in P. lichtensteinii. The absence of a pronounced sexual dimorphism and the size at the onset of sexual maturity observed only for P. lichtensteinii might be explained by distinct reproductive strategies of males. The presence of ovigerous females during the entire sampling period suggests that all three species have a continuous reproduction pattern at the Ubatuba region. Future studies on the population structure, functional maturity, and mating system should improve the understanding of factors driving the biology and ecology of these species at a subtropical region. © Marine Biological Association of the United Kingdom 2013.

Influence of exercise order on upper body maximum and submaximal strength gains in trained men

The purpose of this study was to investigate the influence of exercise order on one-repetition maximum (1-RM) and ten-repetition maximum (10-RM) strength gains after 6 weeks of resistance training (RT) in trained men. Sixteen men were randomly assigned into two groups based on the order of exercises performed during training sessions: a group that performed large muscle group exercises first and progressed to small muscle group exercises (LG-SM); while a second group performed the opposite sequence and started with small muscle group exercises and progressed to large muscle group exercises (SM-LG). Four sessions of RT were conducted per week; all exercises were performed for three sets of 8-12 repetitions with 1-min rest intervals between sets. Maximal and submaximal strength were assessed at baseline and after 6 weeks of RT with 1-RM and 10-RM testing for the bench press (BP), lat pulldown (LPD), triceps pulley extension (TE) and biceps curl (BC), respectively. Two-way ANOVA for the 1-RM and 10-RM tests indicated a significant group x time interaction. The 1-RM values significantly increased for all exercises in both groups (P<0.05), but were not significantly different between groups. However, effect size (ES) data indicated that the LG-SM group exhibited a greater magnitude of gains (1-RM and 10-RM) for the BP and LPD exercises. Conversely, ES indicated that the SM-LG group exhibited a greater magnitude of gains (1-RM and 10-RM) for the TE and BC exercises. In conclusion, the results suggest that upper body movements should be prioritized and performed according to individual needs to maximize maximal and submaximal strength. © 2013 Scandinavian Society of Clinical Physiology and Nuclear Medicine.

Fatores relacionados ao gasto e consumo energético de mulheres obesas com e sem síndrome metabólica

Pós-graduação em Alimentos e Nutrição - FCFAR

Avaliação da formação óssea em implantes dentários de ratos não diabéticos, diabéticos não controlados e controlados com insulina

Pós-graduação em Bases Gerais da Cirurgia - FMB

Os saberes docentes na história de vida do professor de educação física

Pós-graduação em Educação - IBRC

Evolução da obesidade da infância até a vida adulta entre mulheres da fila de espera para a cirurgia bariátrica pelo sistema único de saúde

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise estrutural dos efeitos da desadaptação em componentes de próteses odontológicas utilizando o método dos elementos finitos com elemento de contato e pré-carga

Pós-graduação em Engenharia Mecânica - FEB

Estudo de um modelo dinâmico para avaliação física do corpo humano

Pós-graduação em Engenharia Mecânica - FEG

Efeito dos elementos intersticiais nas propriedades anelásticas da liga Ti-35Nb-7Zr-5Ta para aplicações biomédicas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

A poesia de José Saramago: análise de Os poemas Possíveis, Provavelmente Alegria e O ano de 1993

Pós-graduação em Letras - FCLAS

A integralidade na prática clínica e institucional e na relação ensino-serviço: um estudo de caso sobre a formação do psicólogo em hospital público

Este trabalho consiste em estudar a prática clínica e institucional na formação do psicólogo sob a perspectiva da integralidade em saúde no Hospital Universitário João de Barros Barreto - HUJBB. A escolha do campo de estudo deveu-se ao conhecimento do hospital enquanto área de trabalho, assim como pelo fato deste ser um dos três únicos locais no SUS que servem de prática para o Curso de Psicologia da UFPA, onde se propicia aos alunos terem contato com a prática clínica e institucional, aplicando referenciais teórico-metodológicos de Psicanálise, análise institucional, processos grupais e de comunicação e conhecimentos de Saúde Pública. Utilizando-se da abordagem qualitativa, os procedimentos de coleta de dados foram a entrevista semi-estruturada, os questionários e a observação participante. Entre os aspectos relevantes o estudo observou: a fragmentação constante do trabalho dos diversos profissionais envolvidos e a busca do psicólogo por um espaço mais consolidado e articulado de atuação na equipe de saúde; a falta de conhecimentos prévios de saúde coletiva por parte dos discentes motivando um esforço concentrado dos supervisores e orientadores de campo na relação ensino-serviço; o sucateamento das instalações físicas e dos equipamentos do hospital gerando dificuldades, mas, simultaneamente, estimulando uma subjetividade expressa na colaboração entre funcionários e alunos; o esforço do Serviço de Psicologia em reconduzir o trabalho centrado no ato médico e no corpo enfermo para uma atenção marcada pela relação com o paciente como sujeito e para os distintos modos de subjetivação psicopatológicos que constituem o problema teórico-metodológico colocado para sua eficácia psicoterápica; e, por fim, sua inserção nas equipes multiprofissionais. A trama formada pelo conjunto desses protagonismos configura o desafio do psicólogo, junto com os demais profissionais, para compreender e levar a cabo a integralidade da atenção, em exercício permanentede construção no hospital. Dois teóricos destacam-se na argumentação que problematiza a atenção integral no hospital - Canguilhem, para a discussão do conceito de saúde enquanto possibilidade de viver em conformidade com o meio e Winnicott, na perspectiva clínica possível nesse ambiente.