Nonlinear formulation based on FEM, Mazars damage criterion and Fick's law applied to failure assessment of reinforced concrete structures subjected to chloride ingress and reinforcements corrosion

Structural durability is an important design criterion, which must be assessed for every type of structure. In this regard, especial attention must be addressed to the durability of reinforced concrete (RC) structures. When RC structures are located in aggressive environments, its durability is strongly reduced by physical/chemical/mechanical processes that trigger the corrosion of reinforcements. Among these processes, the diffusion of chlorides is recognized as one of major responsible of corrosion phenomenon start. To accurate modelling the corrosion of reinforcements and to assess the durability of RC structures, a mechanical model that accounts realistically for both concrete and steel mechanical behaviour must be considered. In this context, this study presents a numerical nonlinear formulation based on the finite element method applied to structural analysis of RC structures subjected to chloride penetration and reinforcements corrosion. The physical nonlinearity of concrete is described by Mazars damage model whereas for reinforcements elastoplastic criteria are adopted. The steel loss along time due to corrosion is modelled using an empirical approach presented in literature and the chloride concentration growth along structural cover is represented by Fick's law. The proposed model is applied to analysis of bended structures. The results obtained by the proposed numerical approach are compared to responses available in literature in order to illustrate the evolution of structural resistant load after corrosion start. (C) 2014 Elsevier Ltd. All rights reserved.

Reproductive cycle and recruitment period of Ocypode quadrata (Decapoda, Ocypodidae) at a sandy beach in southeastern Brazil

The reproductive cycle and recruitment period of a ghost crab population from Ubatuba, São Paulo, Brazil were investigated by means of examining the developmental stages of gonads of breeding crabs and the ingress of young recruits to the studied population. Monthly collections over a one-year period were carried out during nocturnal low-tide periods at Vermelha beach. The morphology of the abdomen and pleopods was used for sex determination. All captured crabs were measured for carapace width and dissected for the determination of the development stage of the gonads. A total of 582 specimens was captured: 271 males, 241 females, and 70 juveniles. Size ranged from 8.5 to 37.5 mm for males, from 9.5 to 39.2 mm for females, and from 5.8 to 12 mm for early juveniles. Median size of males and females did not differ statistically. The frequency of ovigerous females was markedly low. The onset of sexual maturity in females is achieved at around 23 mm of carapace width. Mature females with advanced gonad stages were not recorded from May to September. Recruitment of young was highest during summer, but the presence of early and late juvenile specimens throughout the year indicates that continuous recruitment is taking place in the studied population.

Electrochemical behaviour of heat-treated Al-Zn-Mg alloys in chloride solutions containing sulphate

The electrochemical corrosion and passivation of Al-5Zn-1.7Mg-0.23Cu-0.053Nb alloys, submitted to different heat treatments (cold-rolled, annealed, quenched and aged, and quenched in two steps and aged), in sulphate-containing chloride solutions, has been studied by means of cyclic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS). The cyclic polarization curves showed that sulphate addition to the chloride solution produced a poor reproducible shift of the breakdown potential to more positive potentials. The repassivation potentials, much more reproducible, and practically separating the passive from the pitting potential region, were slightly displaced in the negative direction with that addition. When the alloys were potentiodynamically polarized in the passive potential region, sulphate was incorporated in the oxide film, thus precluding chloride ingress. In addition, Zn depletion was favoured, whereas Mg losses were avoided. Different equivalent circuits corresponding to different alloys and potentials in the passive and pitting regions were employed to account for the electrochemical processes taking place in each condition. This work shows that sulphate makes these alloys more sensitive to corrosion, increasing the fracture properties of the surface layer and favouring the pitting attack over greater areas than chloride alone. (C) 2002 Elsevier B.V. Ltd. All rights reserved.

Effect of hydrogen charging on the stability of SAE 10B22 steel surface in alkaline solutions

The influence of hydrogen charging into a quenched and tempered boron steel membrane electrode (SAE 10B22) was studied using borate buffer (pH 8.4) and NaOH solutions (pH 12.7), with or without the addition of 0.01 M EDTA. At the hydrogen input side, hydrogen charging influenced cyclic voltammograms increasing the anodic charge of iron(II) hydroxide formation, and decreasing the donor density of passive films. These results suggest that the hydrogen ingress caused instability of metallic surface, increasing the surface area activity. (C) 2005 Elsevier Ltd. All rights reserved.

A formação de trabalhadores brasileiros: a experiência do Colégio Isabel

Colegio Isabel was a project that aimed to "civilize" the indigenous children who lived in the Vale do Araguaia region, Goias Province, to educate national workers and, progressively, incorporate the lands owned by the Indians in the productive process. Colegio Isabel allowed its students a marginal integration in the society, assigning them functions that the so called "civilized" people considered degrading. The egress students lived an ambiguous and marginal life, regarding the original ethnic groups and the adopted society.

O projeto educação e cidadania e a escolarização do adolescente autor de ato infracional

Pós-graduação em Educação - IBRC

Sanção expiatória versus sanção por reciprocidade: estudo exploratório em dez classes de educação infantil. -

Pós-graduação em Educação - IBRC

Relembranças em minguante: interpretação biográfica da obra de Carmo Bernardes

Pós-graduação em História - FCHS

A percepção de docentes, discentes e egressos do curso de engenharia civil - campus de Bauru: sobre algumas questões curriculares

Pós-graduação em Educação - FFC

O acaso, o poeta e a re-visão da ciência no límen do milênio

O Canto II do poema A Máquina do Mundo Repensada, de Haroldo de Campos (2000), é inovador ao trazer, para o cerne de um texto composto em terza rima, a ciência como protagonista da mensagem poética veiculada ao longo dos versos. Se na primeira parte do poema há um retorno aos textos da tradição, na segunda, ainda que esses diálogos permaneçam sub-repticiamente, o impulso para novos horizontes é assegurado pelo ingresso do tema científico no poema, que impulsiona o eu-poético a novos caminhos e estreita as possibilidades de estabelecimento do texto literário como palco das descobertas da ciência, ao mesmo tempo que questionador dessas descobertas. No Canto II do poema haroldiano, objeto de análise neste artigo, o desbravar das fronteiras da literatura tangencia o desbravar das fronteiras da ciência. Isso faz de Haroldo um poeta do “absolutamente novo”.

O ensino da Saúde Pública Veterinária nos cursos de graduação em Medicina Veterinária da região Sudeste do Brasil

Pós-graduação em Medicina Veterinária - FCAV

Satisfação e o emprego no Sistema Público de Saúde na área de saúde bucal

The aim this study was to know work conditions of dental surgeon in Brazilian Health System (SUS), by their perception, analyzing: type of ingress, work regime, workload, realized income, existence of Career Plan, Posts and Ages (PCCS) and satisfaction with public employment. The sample was constituted by dental surgeons (n=83) of 12 cities public system from Health Regional Department XV – São José do Rio Preto City – São Paulo State. Data collection was by interviews using a questionnaire. Results point that 19% of interviewed people didn’t take an open competition to ingress on SUS. Statutory scheme of work was more adopted getting 57% of professionals. Different working days were observed: 57% is relative to 20 hours, 7% to 30 hours and 36 hours to 40 hours. About satisfaction with incomes, 66% of professionals were dissatisfied, observing the absence of PCCS in 11 cities. About satisfaction with public employment, just 5% said to be “dissatisfied”; 11% “few satisfied” and the majority 62% and 22% affirmed to be “satisfied” and “satisfied so much” respectively. Although PCCS not to be reality in studied cities and the majority of professionals to say “to be dissatisfied” with wage, around totality of interviewed people is “dissatisfied” with public employment on SUS.

Mercadorização da educação: elementos que circunscrevem a formação inicial de professores

Pós-graduação em Educação - FFC

Germinação de sementes de maracujazeiros: água, luz, temperatura e reguladores vegetais

The production of seedlings of passion fruit is done mainly with the use of seeds by most producers. It can also be propagated by cuttings, layering and in vitro tissue culture. However, even when grafting is used, it is necessary to use seeds to produce the rootstock. Nevertheless, most Passifloracea species have germination problems, making it difficult to obtain seedlings. Although several studies have been developed in an attempt to increase seed germination of passion fruit there are still difficulties in understanding the germination process and also disagreement about seed dormancy. Thus, the present study aimed to review papers related to seed germination of passion fruit emphasizing aspects such as mechanical resistance to water ingress, the need for adequate light and temperature and the use of plant growth regulators in overcoming seed dormancy. It was noticed that, in general, the passion fruit seeds are photoblastic negative and exhibit physiological dormancy, being no need of seed scarification to stimulate its germination.