Estudo da velocidade de despassivação de aços em estruturas de concreto armado, em meio de cloreto

The aim of the present study was to investigate the corrosion resistance in chloride medium of two cylindrical steel samples from civil construction (CA-50 and CA-60). For this purpose, electrochemical measurements were performed in NaCl solution, 4.0 g/L, naturally aerated. According to electrochemical responses, it was observed an active dissolution process at open circuit potential for both steels. In this comparative study, the differences between CA-50 and CA60 were not significant, since the values of polarization resistance estimated by EIS were the same order of magnitude for both types of steel (oscillating between 200 and 500 Ohm). For all evaluated thicknesses of concrete reinforcement, these values ranged between 2 and 9 kOhm, and the lower value was associated with lower thickness, particularly at 7, 21 and 35 days. When these results were compared with those determined for the CA-60, it was found that the layer of concrete reinforcement provide a protection against corrosion in chloride medium at least ten times larger

Desenvolvimento de sistema eletrônico para instrumentar um DPL em ensaio dinâmico de resistência do solo

Pós-graduação em Engenharia Elétrica - FEIS

Inquérito sobre a qualidade de vida relacionada à saúde em crianças e adolescentes portadores de artrites idiopáticas juvenis

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

Comparação entre a recuperação da economia de corrida e força muscular medida por diferentes métodos após o dano muscular

The goal of the present study was to investigate possible differences towards strenght recovery measured by different methods and running economy (RE), after one session of downhill running (DR), in order to induce muscle damage (MD). Our hypothesis is that the strenght recovery measured by jumps is more alike RE markers, due to the measures' specificity. Ten male subjects, ages 18 to 30, apparently healthy, without any experience with strenght training at least 6 months before the tests took place in this study. After going to the lab twice (to familiarize themselves with the protocols, and determine their maximum oxygen consumption/running speeds), they went to the lab five times in the following week, in order to collect all the variables before, immediately after, and 24, 48, 72 and 96 hours in. The variables obtained were: stride frequency (SF), stride lenght (SL), oxygen volume (VO2), carbon dioxide volume (VCO2), ventilation (VE), lactate blood concentration ([Lac]), isometric peak torque (IPT), subjective pain perception (SPP), effort perception (EP), medial-portion circumference (CIR), knee movement extent (EXT), torque development rate (TDR), counter movement jump and squat jump height (HCM and HS), strenght development rate of both jumps (SDCM and SDS), and maximum soil strenght reaction (SRCM and SRS). Changes over time in all variables were verified by one way variancy analysis. Differences between the strenght measures were verified by two way variancy analysis. When significant effects were verified, Tuckey's post-hoc were applied. The significancy level taken on this study was p < 0,05. Of all indirect muscle damage markers, IPT, SPP and TDR were the only ones in which ocurred significant changes. We couldn't find the moments where this happened for TDR with the post-hoc used. On RE markers, VO2, [Lac] and VE suffered significant effects over time. About the jumps variables, only SDCM and HCM presented significant...

Sentidos de escola e de educação construídos por jovens em cumprimento de medida socioeducativa

O presente trabalho tem por objetivo investigar os sentidos de educação e de escola construídos por jovens/adolescentes que cumprem medida socioeducativa e/ou encontram-se em situação de vulnerabilidade social, evadidos ou não do sistema escolar. Nossa intenção com a pesquisa foi ouvir os jovens/adolescentes para saber quais são os sentidos construídos ao longo da vida escolar sobre educação, sobre a formação recebida na escola e suas relações cotidianas no interior da instituição escolar. Para alcançarmos tais resultados, foi realizada uma pesquisa qualitativa, empírica, utilizandose como instrumento de coleta de dados a entrevista semi-estruturada. De forma geral, com esse trabalho pretendeu-se apresentar uma reflexão sobre os significados do processo de escolarização desses jovens/adolescentes, buscando, assim, contribuir com um conhecimento mais aprofundado, que possa subsidiar a prática com esses sujeitos, no que refere a pensar em um modelo de educação mais significativo, e adequado a esses jovens, que afirmam gostar da escola, pelo seu potencial socializador

A articulação do quadril em uma perspectiva preditora da velocidade de marcha em idosas e como foco de intervenção de duas modalidades terapêuticas: Método Pilates e Haste Vibratória

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Diesel e biodiesel de murumuru e de soja: desempenho operacional de trator agrícola no preparo do solo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

História e ensino de Matemática: construção e uso de instrumentos de medida do século XVI

Entre as diversas iniciativas que procuram aproximar a História da Matemática do ensino da Matemática, o uso de fontes primárias tem sido muito promissor. Seguindo de perto esta tendência, propomos abaixo três atividades baseadas em excertos retirados de uma obra publicada no século XVI

A influência das variáveis do lixamento tubular na qualidade das peças de Eucalyptus grandis

In 2010, the Brazilian forest sector is represented by about 30,000 companies producing US$ 21 billion annually and account for approximately 5% of the gross domestic product (GDP) in the country. The sanding process is highly demanded in various stages of industrialization of the wood, when there is a need for a better quality surface finishing. The objective of this work was to analyze the influence of cutting speed and sandpaper granulometry on both the surface finishing of pieces of Eucalyptus grandis processed through tubular sanding and on the sanding efforts (force and power of sanding). Four cutting speeds were used (19.5, 22.7, 26 and 28.1 m/s), one advance speed (16 m/min) and three sets of sandpaper (80-100, 80-120 and 100-120) being one for chipping and another for finishing, respectively. A central data acquisition system was set up to capture the variables (cutting power, acoustic emission and vibration) in real time. The cutting force was obtained indirectly, through a frequency inverter. The roughness of the parts was measured by a roughness meter before and after sanding. The highest cutting speed used (28.1 m/s) consumed more power and generated more acoustic emission among the four speeds tested. Regarding the vibration, the lower cutting speed (19.5 m/ s) generated the highest vibration in the sander machine. It is concluded that the range of 100-120 sandpapers resulted in values of average roughness (Ra) lower than the other sets of sandpaper used, as it resulted in better surface finishing.

Análise experimental da resistência à corrosão e da velocidade de corrosão: uma proposta pedagógica

In this work it is proposed the use of a chemical activity, in which a corrosion process occurs, aiming to provide to the student relationship among the learning concepts and corrosion phenomena that occur everyday. It is suggested that the experiment development is based on Vygotsky theory, so that students work in groups, which may facilitate social interaction among students and results discussion among groups under professor guidance. This proposal can provide the involved concepts learning, as well as student training such as a critical and reflexive individual.

Relacionamento entre as variáveis da corrida de aproximação e da posição de pé de apoio com a velocidade da bola nos chutes com o membro dominante e não dominante

The aim of the study was to analyze the relationship between run-up spatial-temporal variables with ball velocity in the dominant and non-dominant kicks, and to compare the ball velocity between contralateral limbs. Six futsal players (aged 13 and 14 years) participated in the study. The participants performed 4 kicks with maximal velocity in the stationary ball with each limb. Participants’ movements were recorded by 4 digital cameras (120 Hz). Dvideow software was used for kinematic procedures. The variables analyzed were: length and width of the last but one step and last step before ball contact, distance of the support foot to the ball, run-up velocity and ball velocity. The relationship between spatial-temporal variables with the ball velocity was analyzed by linear regressions with ball velocity as dependent variable. Student t test for paired samples was used to compare ball velocity between dominant and non-dominant kicks. For the dominant limb, the ball velocity was predicted only by the run-up velocity in 16.7%, while for the non-dominant limb only the distance of the support foot to the ball was prognostic variable in 11.9%. The ball velocity was greater for the dominant limb. Run-up variables that predictive ball velocity were different between the dominant and non-dominant kicks.

Relação dos saltos vertical, horizontal e sêxtuplo com a agilidade e velocidade em crianças

The aim of the present study were: 1) To verify the relationship of vertical, horizontal and sextuple jumps with agility and velocity of 5, 10 and 25 m; 2) To verify the capacity of these jumps to predict the agility and 5, 10 and 25 m velocity performance in children. Twenty eight boys (9.47 ± 0.64 years) and thirty girls (9.69 ± 0.70 years) were evaluated. The correlation values between agility and velocity on 5, 10 and 25 m velocity were, respectively, r = 0.63, 0.51, 0.44 and 0.64 with vertical jump, r = 0.68, 0.62, 0.28 and 0.62 with sextuple jump, and r = 0.60, 0.50, 0.26 and 0.57 with horizontal jump. The vertical and sextuple jumps were able to predict the agility and 25 m velocity performance (p < 0.05). Furthermore, they demonstrated capacity to predict 5 and 10 m velocity, respectively (p < 0.05). The vertical and sextuple jump tests may be used for assessment and control of training with children practicing activities that require agility and velocity, since both jumps predicted the agility and velocity performance, which did not occur with the horizontal jump.

Reatividade e tolerância ao calor de fêmeas ovinas de diferentes grupos genéticos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O confisco sem condenação penal como medida de recuperação dos bens e valores instrumentos ou produtos da lavagem de ativos

Pós-graduação em Direito - FCHS