Análise experimental da conexão entre blocos segmentais e geogrelha de PVA

The test system connection segmental blocks and geogrids at the Department of Civil Engineering, UNESP - Guaratinguetá order to verify the strength of the connection system when subjected to different confining stresses. The present work aims to demonstrate the procedures for carrying out the test as well as the placement of concrete blocks. Were analyzed two ways of placing the blocks in the press. An entire block and two halves in the first layer, named position 12, compared to a different format, two entire blocks in the first layer, named position 21; also geogrids: single and double layer. From the data obtained for the peak strength of 20 tests it was possible to obtain the envelopes break in the connection for single and double layer. In 2011, the size of the concrete block used in the test was lower when compared with previous years. What resulted in significant decreases in the loss of connection in single layer and it was noted that there was no decrease in the strength of connection in the double-layer tests, despite the smaller area of contact between the block and geogrid. It is concluded that, through the analysis of geogrids after running the test, the concrete block is responsible for theforce that allows the movement of the geogrid due to the force from the ground

Análise dos processos de infiltração, percolação, retenção e evaporação em solos arenoso e residuais utilizando lisímetro

The mobility of water in the soil is a difficult process to be quantified. During precipitation, there is a portion of the water that infiltrates, which is very important for recovering the groundwater balance. This work studies the mobility of water in sandy soils with different textures and residual soils through experiments mounted in lysimeters. The lysimeters were mounted on acrylic cylinder with 11.3 cm diameter and 25.0 cm in length. The sand was deposited using the process sand rain. In the tests it was maintained a hydraulic head of two centimeters above the surface with the aid of a Mariotte flask. The portions of water were controlled in the experiments using relations between weight and volume measurements over time. The data were obtained by monitoring the input and output volumes of water through calibrated reservoir and system weight by an electronic balance. The infiltration front was monitored with the aid of a digital camera. The results indicate that the smaller the particle size of the sand, the lower the speed of the saturation front, the higher the retained volume, the smaller the basic rate of infiltration and the lowest speed of percolation. Moreover, the rate of water loss in the evaporation process indicated no significant difference with variation of the particle size of the samples

Avaliação da tenacidade CHARPY-V de um tubo de aço API 5L X70 soldado com arco submerso

This research project focused primarily on assessing the impact toughness of the weld and the base material of a steel pipe API 5L X70 submerged arc welded, used to conduct remote oil and gas (linepipes). The analysis followed strictly the Specification for Line Pipe - API 5L Standard, regarding the removal of the specimens of regions-of-proof-long section of the pipe, at 90o and 180o from the welded joint, and mechanical properties of toughness and Charpy-V, both the joint welded as the base material. Specimens of steel tube supplied by Tenaris Confab-SA were sized for tensile and Charpy-V, according to ASTM E 8M and ASTM E23, respectively. The result obtained showed that the API X70 steel tube has high Charpy-V toughness, near to each other at both 90o and 180o from the welded joint of the tube, and both higher than the weld metal. Microstructural and microhardness analysis complemented the present study

Estudo das propriedades elétricas do cobre e alumínio; sobre a força magnética em um imã caindo dentro de um tubo

Magnetic fields can be produced by natural magnets, artificial magnets, and by circulating electric currents in wires and solenoids. An interesting experiment to observe the interaction between the magnetic field and free charges in a conductor, a magnet falling inside a tube made of conductive materials. The slowing down of the magnet by the appearance of a field in the opposite direction to the original one (Lenz's Law) is function the number of free electrons in the conductor and the electrical properties of this. Based on this, the objective of this study is to analyze the relationship between the electrical properties of conductors, copper and aluminum, with magnetic force on a neodymium magnet-iron-boron magnet falling inside a copper tube and aluminum, positioned vertically. In performing this experiment, we observed that it is a demonstration of Lenz-Faraday’s Law

Ensino a distância: um estudo de caso utilizando ferramentas modernas no ensino de técnicas estatísticas

In recent years it was possible to see a considerable growth of distance education, while the classroom teaching had a more modest growth. Thus, maintained this scenario, it will not take long for the quantitative indicators of distance education outweigh the classroom education. The distance education is evolving rapidly and changing traditional methods of acquiring knowledge and reduce inequalities caused by isolation and distance from large urban centers. This work aims to develop a videolesson and analyze its application in the teaching of statistics to a class of students of FEG, using modern techniques of distance education. To that end, was record a videolesson and developed two assessment tools, one practical and the other qualitative. The results showed that students prefer to follow the resolution of examples, with high degree of difficulty, and the audio recording is a key to the proper understanding of the same. In addition, students consider important mainstay of distance education, the fact that you can attend a class several times, whenever you need it, anywhere

Contribuições da motivação na prática de atividade física regular

A atividade física vem sendo praticada pelo ser humano desde tempos primitivos, evoluindo até os dias atuais, que de maneira sistematizada pode ser interpretada com exercício físico. Muitos são os benefícios dessa prática, principalmente para a obtenção de resultado e qualidade de vida, segundo também de acordo com os objetivos individuais de cada um. Entretanto esses benefícios são claros para indivíduos que querem obter um condicionamento físico e para pessoas com algum grau de obesidade, contudo os fatores psicológicos se mostram presente, para que assim permaneçam na prática a ponto de perceberem os resultados e alcancem seus objetivos. O presente trabalho tem como objetivo analisar as contribuições da motivação na prática de atividade física regular. Para a realização do mesmo foram utilizados com quatro homens e oito mulheres com faixa etária entre 20 e 30 anos, que realizam algum tipo de exercício físico a mais que 6 meses. O procedimento baseouse em uma entrevista semi-estrutura onde cada entrevistado tinha um encontro particular. As falas foram registradas e posteriormente analisadas com minúcia. Os dados obtidos pela entrevista foram cruzados com a literatura a fim de encontrar onde a motivação teria a sua influência. Conclui-se que a motivação tem papel importante para a aderência dos indivíduos e manutenção da mesma por períodos longo de tempo, favorecendo a efetividade na obtenção de resultados

Avaliação da influência dos parâmetros de processo de soldagem MIG no surgimento de poros em tubos de alumínio

The process of electric arc welding with shielding gas (GMAW) is being increasingly used in various industrial applications. This process occurs by which an electric arc is established between the work piece and a consumable in the form of wire, the arc melts the wire continuously as it is fed to the weld pool. The weld metal is protected from the atmosphere by flowing a gas (or gas mixture) inert or active. This paper presents a study of the welding process GMAW - MIG on aluminum tubes, alloy 6101 - T6, used in the manufacture of armored busbar, intended for driving electric power plants. 5(five) were welded specimens, changing certain welding parameters at each time was monitored welding joint as well as the interpass temperature. Tests were performed bending, tensile and macrographical analysis of body-of-evidence and through its results was possible to reach a better welding condition, which minimizes the appearance of pores, since the porosity has great influence on the mechanical strength and electrical conductivity of welded pipes

Análise das resistências de embutimento e de compressão para madeiras de pinus e eucalipto

The connections in the wood structures are the places with high concentrations of stresses and therefore are more fragile than the rest of the structure. The connections between pieces of wood can be made by metal pins (nails or screws). The compression and embedment strength has significant influence on the calculation of the connections. The main aim of this work was to evaluate the compression and embedment strength in the directions parallel, inclined at 45° and normal to the grain, using standard specimens according to ABNT NBR 7190/1997 standard. The compression and embedment strength were initially evaluated according to ABNT NBR 7190/1997, which admits the deformation of 2‰ as limit of embedment and the ratio between the ultimate strength and the area of application of load in the specimen for the compressive strength. Afterward, the embedment strength was evaluated by the EUROCEDE 5 /1995 European standard, which use the limit of 5 mm of the displacement for the embedment. Specimens of Pinus oocarpa, Cumaru and Pinus taeda were used in tests to calibration of equipment and specimens of Pinus taeda and Eucalipto citriodora were used to compare the results of strength. The results of strength were evaluated based on statistical analysis. The results of compressive strength for the Pinus taeda showed no significant differences in embedment strength in the directions parallel and normal to the grain. For the Eucalipto citriodora only in the direction parallel to grain the compression strength was not significant compared with the embedment strength. For both species, only the parallel compression strength and inclined at 45o to the grain, which were to the grain, which were admitted the strain of 2‰ were not significantly different compared with the compression strength determined according to ABNT NBR 7190/1997. The normal compression strength obtained according to ABNT NBR 7190/1997 and ultimate compression strength not ...

Redução dos riscos de operação na montagem de mancais em cilindros de laminação em uma usina siderúrgica

The increasing concerns about the health and safety is significantly changing the costeffective management of labor, also becoming an important tool in the pursuit of quality. In this context the present work makes a studyin a steel mill, to determine an action plan with the goal of reducing the risk of injury during handling and setting up bearings in a workshop of rolling mill rolls. The study is structured through the Method of Analysis and Troubleshooting, and quality tools. The definition of the action plan has brought lowcost measures that seek to solve the problem, eliminating the possibility of fatality or inability to employees

Benefícios dos relatórios de sustentabilidade na competitividade e melhoria da gestão empresarial: estudo de caso do setor automotivo

The increase of the world population and their consumption power requires companies to increase their production capacity to meet demand. This production process is often performed without control and degrades the environment. In view of the stiffness of the legal requirements and the increasing of environmental concerns, companies need to act in a sustainable way to continue existing. The main objective of this study is to investigate how sustainability reports that follow the guidelines of the Global Reporting Initiative (GRI) can bring benefits to companies in the continuous improvement of its processes and the competitiveness of the sector. The sector chosen for the study was the automotive industry, due to its importance in the national economy and the significant impacts caused to the population and to the environment. The methodology consists of reading the GRI sustainability reports of companies and then performing a comparison among them and the bibliography of the subject. The results confirm the importance of the GRI sustainability reporting for companies and show how the selected indicators can contribute to the corporate management and to the control of its processes

Avaliação da toxicidade de corantes azóicos por Allium cepa e estudo da capacidade de remoção destes compostos em solução por Saccharomyces cerevisiae

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Análise do comportamento térmico de paredes de madeira

This study consists in the observation and evaluation of the thermal behavior and distribution of wood composite walls, MDF – Medium Density Fiberboard, HDF – High Density Fiberboard, OSB – Oriented Strand Board and EGP – Edge Glued Panel. This study had the objective to present the experimental thermal behavior and to verify which one fit the thermal comfort standards for human labor For this work, was developed a thermal chamber, with one interchangeable side, so the wall prototypes would fit for each experiment. We studied walls made of MDF, HDF, OSB and EGP, which one had its own distinct behavior due to the panel construction. The EGP wall had shown the most reliable material for this usage at high temperatures. With this work, it was demonstrated the importance of choice for the right material and construction method for wooden composite walls, because if they were scaled poorly, the people exposed to them would be uncomfortable by the proportionate environment, and the costs for a resizing would be too high

Comparação entre métodos e análise de correntes de curto-circuito

Overcurrents may endanger the whole electrical system and living beings, they are the result of short circuits and failures that can occur in electrical systems, no matter how well designed they are. Therefore it is important to predict these failures with analysis of electrical systems to make it possible to design appropriate protections, to ensure that those intervene properly and avoid technical and mainly human losses. However there is no standard for calculation of the short circuit currents, the main authors of the national literature about the subject suggest various methods, knowing the particularities among them provides quick and easy choice and proper application of them. To do so, a base case from an electrical system that presents a short circuit is chosen, which will be analyzed using the methods presented

Zoneamento geoambiental do estado do Tocantins

The lack of environment planning studies in Brazil drives to an imbalance due to a disorderly occupation in some areas. As the youngest Brazilian state facing a fast occupation, Tocantins is included on this situation. In order to provide guidelines for an environment planning studies, this paper is under geoenvironmental zoning which is based on the integration of physical aspects. This detailed study supported by maps elaborated on GIS environment, will be able to present the support for planning studies focused on the potential or limitation of the area

A (re) valorização do espaço do distrito de Parelheiros-SP: moradia, preservação ambiental e políticas públicas

A ocupação das áreas de mananciais - especificamente no extremo da zona sul de São Paulo, desde algum tempo, tem tomado lugar nas pautas de discussões dos programas políticos. Esses programas têm por objetivo, aparentemente, melhorar a relação entre a moradia e a preservação ambiental. Estas regiões consideradas estratégicas e de extrema importância para São Paulo tem preocupado e exigido ações do Estado cada vez mais rápidas. Isso acontece pelo crescente aumento do número de habitantes, pelo potencial hídrico e ecológico que representa aquele espaço e a constante pressão da população de baixa renda reivindicando desde sempre seu direito a morar. O Trabalho procurou demonstrar como este problema estrutural está sendo tratado pelo poder público dentro da Cidade de São Paulo, enfocando particularmente o Distrito de Parelheiros