997 resultados para Solos - Tensão
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Mode of access: Internet.
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Mode of access: Internet.
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Includes index.
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El trabajo pretende indagar en los diversos sentidos que adquiere un espacio público de la Ciudad de Buenos aires ubicado en el barrio de Mataderos, el Parque Alberdi. A partir del análisis de su construcción, su equipamiento y las intervenciones posteriores que se le realizaron, se pretende dar cuenta de los usos que el parque como institución propuso inicialmente y propone en la actualidad. A su vez, se busca rastrear las opiniones y recuerdos de los usuarios del parque. Un tercer eje a tomar, son los usos efectivos del parque, los tránsitos y prácticas que se realizan cotidianamente. A partir de estos tres ejes, se busca reconstruir los diversos sentidos que emergen en torno a este espacio público, y qué vínculos existen entre estos sentidos (identificación, solapamiento, oposición, filtraciones, resignificaciones, etc.). De este modo, este trabajo busca dialogar (a partir de una mirada territorializada) con la compleja categoría de espacio público, y las expectativas políticas y filosóficas que esta carga
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El trabajo pretende indagar en los diversos sentidos que adquiere un espacio público de la Ciudad de Buenos aires ubicado en el barrio de Mataderos, el Parque Alberdi. A partir del análisis de su construcción, su equipamiento y las intervenciones posteriores que se le realizaron, se pretende dar cuenta de los usos que el parque como institución propuso inicialmente y propone en la actualidad. A su vez, se busca rastrear las opiniones y recuerdos de los usuarios del parque. Un tercer eje a tomar, son los usos efectivos del parque, los tránsitos y prácticas que se realizan cotidianamente. A partir de estos tres ejes, se busca reconstruir los diversos sentidos que emergen en torno a este espacio público, y qué vínculos existen entre estos sentidos (identificación, solapamiento, oposición, filtraciones, resignificaciones, etc.). De este modo, este trabajo busca dialogar (a partir de una mirada territorializada) con la compleja categoría de espacio público, y las expectativas políticas y filosóficas que esta carga
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Esta pesquisa tem por objetivo identificar a intensidade dos valores organizacionais de uma empresa familiar do ramo de prestação de serviços do setor elétrico, como se dá a transmissão destes valores e quanto eles estão alinhados com uma percepção ideal de valor. Foi conceituado como ditos os elementos culturais formalizados. Atribuiu-se a expressão não dito aos valores formalizados mas que não conseguiram vencer a barreira do documento onde estão expressos. A pesquisa, de natureza empírica, adotou o modelo de estudo de caso único e utiliza como seu principal referencial teórico a pesquisa de Tamayo (1996), denominada Escala de Valores Organizacionais. Foram utilizadas entrevistas do tipo pautadas com o fundador da empresa e focalizadas com os funcionários e líder. Foi utilizado questionário estruturado do autor mencionado com as instruções adaptadas para o contexto da empresa e dado tratamento matemático para apurar os resultados. O estudo de campo deu-se por meio de observações sistemáticas em visitas realizadas nas duas unidades da empresa (Osasco SP e Jundiaí SP). Os resultados do estudo apresentam-se em tabelas para melhor visualização dos dados. As conclusões apontaram para a existência de valores com pouca intensidade. Os mais intensos são direcionados para Eficiência e Eficácia e para laços de relacionamento, ambos originários da formação profissional e pessoal do fundador. Os resultados também mostram, por meio da observação dos componentes da cultura, uma baixa capacidade de transmissão dos valores organizacionais e um alto desalinhamento dos valores percebidos como real em relação ao ideal. Por fim, recomenda-se novos estudos sobre o tema.(AU)
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As mulheres protestantes da cidade de Cali-Colômbia, ao reproduzir nos seus corpos os princípios da tradição religiosa, se deparam hoje com discursos e exigências que não conseguem ou aceitam articular na sua prática cotidiana. Assistimos na atualidade a uma tensão evidente entre a ortodoxia cristã e o imaginário e prática das mulheres cristãs a respeito da corporeidade. Nas últimas décadas a forma de assumir o corpo por parte das mulheres reflete incongruências em relação à matriz doutrinaria do sistema religioso protestante, o que é decorrente, por um lado, da influência cultural e midiática na promoção de uma nova representação do corpo feminino, baseada na beleza e na juventude, e por outro lado a cada vez maior relativização do poder religioso numa sociedade secularizada. As mulheres cristãs acham-se em meio aos ideais do corpo puro e regrado da sua instituição religiosa assim como às cobranças midiáticas, valores e padrões estabelecidos pela sociedade moderna. Neste sentido, a dissertação analisa as interfaces desta tensão discursiva que tem lugar nos corpos, através do próprio discurso das mulheres protestantes assim como das suas práticas cotidianas em relação à corporeidade.
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Nesta pesquisa desenvolvemos um estudo focado na convivência conflituosa entre a música tradicional e a música contemporânea. Foi desenvolvida em um grupo religioso protestante específico, intuindo investigar a hipótese de que há uma tensão entre a prática do Canto Coral e as novas tendências musicais representadas pelas Bandas. Como procedimento metodológico utilizamos uma pesquisa de campo que avaliou a realidade musical em algumas Igrejas Batistas de Campinas. A partir dos resultados obtidos sugerimos ações concretas à práxis pastoral. O primeiro capítulo propõe uma retrospectiva conceitual e histórica do Canto Coral, avaliando sua função antes e depois do processo da reforma e da nova mentalidade musical desenvolvida por Lutero. O segundo capítulo mostra o desenvolvimento da pesquisa realizada junto a seis Igrejas Batistas. Tenta mensurar o gosto musical dos membros dessas comunidades através de um estudo comparativo a partir dos dois pólos: Canto Coral e Banda, ambos, sendo o específico de um campo maior: Tradição e Contemporâneo. O terceiro capítulo, partindo dos impulsos obtidos, desenvolve uma visão crítica sobre os aspectos da tradição, da aceitação à novas tendências, e da tensão propriamente desenvolvida na convivência entre estilos musicais distintos. Mediante tal realidade conflituosa, apresentamos um desafio à práxis pastoral no sentido de se obter possibilidades para uma convivência musical pacífica, considerando a inserção de elementos da contemporaneidade e da tradição na liturgia Batista.
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Esta pesquisa tem o objetivo de analisar como a interatividade e a transparência passaram a ser os novos paradigmas da comunicação empresarial e a forma como as empresas estão lidando com esta nova realidade, manifestada com o surgimento e proliferação das redes sociais. Não apenas a comunicação corporativa, mas o marketing e o atendimento ao cliente foram profundamente afetados pela Web 2.0 e este trabalho procura fazer uma reflexão deste novo momento, ao optar por um estudo qualitativo, onde foram aplicados questionários estruturados e semi-estruturados, além da observação participante. Trata-se de um estudo de caso na Embrapa Solos, o primeiro centro de pesquisa da Empresa Brasileira de Pesquisa Agropecuária a implantar blogs corporativos quando pouco se falava no assunto. Nos últimos cinco anos, desde que os primeiros posts foram publicados, muita coisa mudou na delicada balança de poder x informação/ empresa x consumidor. Este estudo conclui que apesar dos avanços que os blogs proporcionaram não só à Embrapa Solos, mas em outras empresas que adotaram esta e outras redes sociais, ainda há um longo caminho a ser percorrido, de horizontalização de estruturas e real democratização da informação.
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Among the potentially polluting economic activities that compromise the quality of soil and groundwater stations are fuel dealers. Leakage of oil derived fuels in underground tanks or activities improperly with these pollutants can contaminate large areas, causing serious environmental and toxicological problems. The number of gas stations grew haphazardly, without any kind of control, thus the environmental impacts generated by these enterprises grew causing pollution of soil and groundwater. Surfactants using various techniques have been proposed to remedy this kind of contamination. This study presents innovation as the application of different systems containing surfactant in the vapor phase and compares their diesel removal efficiencies of soil containing this contaminant. For this, a system that contains seven injection wells the following vaporized solutions: water, surfactant solution, microemulsion and nanoemulsion, The surfactants used were saponified coconut oil (OCS), in aqueous solution and an ethoxylated alcohol UNTL-90: aqueous solution , and nanoemulsion and microemulsion systems. Among the systems investigated, the nanoemulsion showed the highest efficiency, achieving 88% removal of residual phase diesel, the most ecologically and technically feasible by a system with lower content of active matter
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Environmental liabilities from accidents in the retail petroleum industry, especially in urban areas, have represented a serious problem whose impact reaches the underground, people's health and even economic losses with the remediation process. In U.S.A. are estimated hundreds of billions of dollars invested in soil remediation processes. The results of the reports and investigative reports of liabilities in fuel stations distributed in the urban area of Natal-RN were used to estimate the local scenario of contamination. This database has been possible to determine the main contaminants (BTEX, PAHs, TOC), affected neighborhoods and types of potentially more impacted soils. Experiments were carried out in order to reverse contamination of this scenario, where the soil type was a factor in the planning, because it influences directly on the effectiveness of remediation techniques studied: Oxidation by hydrogen peroxide and oxidation by sodium persulphate. These oxidants are activated forming free radicals (HO•-, SO4 •-, HO2 • , O2 •-, S2O8 -2, etc) responsible for to mineralize the hydrocarbons and other organic compounds (releasing O2 e CO2). In the activation process, the ferrous ions (II) and ferric (III) were studied as well as hydrogen peroxide activation technique with sodium persulfate, the latter being presented the best efficiency among all the study, when activated with Fe+3. In addition to defining the most efficient technique, the aim of this study was to evaluate the influence of different soils among oxidative techniques, characterizing the effect of the concentration of these oxidants and also the concentration of the catalysts. Exists in most scenarios evaluated the presence of intrinsic total iron soil matrix. The so-called latosols present microaggregates reddish indicating the presence of these reactive species like iron and clayey aspect. The kinetic study was conducted by experimental design and monitoring of the percentage of total carbon (SSM-5000A) in the solid and liquid phases, knowing that 82.4% of the diesel molecule is carbon. Yet organic carbon and pH of liquid samples were analyzed for technical, characterizing the influence of soil type and its operating condition. The Fenton-like technique H2O2 e Fe+2 presented satisfactory oxidation, including sandy soil, but well below the best result. The sodium persulphate only activated with temperature, even in the most favorable soil, did not provide good efficiency. The best technique in the study had the concentration profile with 2,2x10- 1mol.L-1 of Na2S2O8 activated with 6,53x10-1mol.L-1 of H2O2 and 2,5x10-2 Fe3+mol.L-1 which reduced in less than a day 96 contamination in red soil, initially with 66,667 mg of diesel per kg of clean soil
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Government efforts have found some obstacles in achieving a better infrastructure regarding environmental preservation requirements. There is a need to develop new techniques that leave the big exploitation of environmental resources. This study measures the evaluation of the behavior of a composite formed by lateritic soil mix and tire buffings. In this way, a road embankment model was developed to assess the bearing capacity of the composite. This study measured the load capacity of the composites with 0%, 10%, 20% and 40% rubber mixed with the soil, by weight, iron plate loading tests on a simulated embankment in a metal box of 1.40 x 1.40 x 0.80 m. After four compaction layers of the composite, a plate test was performed, and then stress-settlement curves were obtained for the material. The embankments with 20% and 40% rubber content was difficult to compact. There was a significant reduction in the load capacity of the soil-plate system with increasing rubber content. The composite with the lowest loss of bearing capacity in relation to the reference soil was the one with a χ = 10%. In the load capacity tests, another aspect noted was the bearing capacity in terms of CBR. The results also show a gradual decrease in bearing capacity in the composites as with the rubber incorporation content increases. As in the plate load tests, the composite that had the lower bearing capacity loss was also that with 10% content.
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Electrochemical technologies have been proposed as a promising alternative for the treatment of effluents and contaminated soils. Therefore, the objective of this work was to study the treatment of contaminated soils and wastewaters using electrochemical technologies. Thus, the study regarding the scale-up of the electrochemical system with continuous flow treatment of wastewater of the petrochemical industry was investigated using platinum electrodes supported on titanium (Ti / Pt), and boron-doped diamond (BDD). The results clearly showed that under the operating conditions studied and electrocatalytic materials employed, the better removal efficiency was achieved with BDD electrode reducing the chemical oxygen demand (COD) from 2746 mg L-1 to 200 mg L-1 in 5 h consuming 56.2 kWh m-3 . The decontamination of soils and effluents by petrochemical products was evaluated by studying the effects of electrokinetic remediation for removal of total petroleum hydrocarbons (HTP) from contaminated soil with diesel. The efficiency of this process was dependent on the electrolyte used Na2SO4 (96.46%), citric acid (81.36%) and NaOH (68.03%) for 15 days. Furthermore, the effluent after treatment of the soil was treated by electrochemical oxidation, achieving a good elimination of the organic polluting load dissolved. Depending on the physical behavior of wastewater contaminated with oil (emulsified state); atrazine emulsified effluents were investigated. The main characteristics of the effluent produced during the washing of contaminated soil were studied, being dependent on the surfactant dosage used; which determined its electrolytic treatment with BDD. The electrochemical oxidation of emulsified effluent of atrazine was efficient, but the key to the treatment is reducing the size of micelles.
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Brazil is a country in development, rich in natural resources. In order to grow sustainably, it is necessary to Brazil to preserve its environment, which is an expressive challenge, especially to industries, such as those producing ceramic materials. This study was developed using Porcelain Tile Polishing Residue (RPP) in blends with soil to build compacted fills. This residue is a slurry generated during the polishing process of porcelain tiles and contains powdery material from the polished tile, the abrasives used during the process and cooling water. The RPP was collected from a private company located in Conde/PB and it was mixed with a sandy-clayey soil, to build the fills. Laboratorial tests were conducted with pure soil, pure RPP and blends in proportions of 5%, 10%, 15% and 20% of RPP in addition to the dry mass of pure soil. The Chemical and Physical Characterization tests performed were: specific solid weight, grain size distribution, laser analysis of grain size distribution, Atterberg limits, X ray fluorescence, X ray diffraction, scanning electron microscopy and soil compaction,. The materials and blends were also compacted and direct shear tests and plate load tests were performed. Plate load tests were conducted using a circular plate with 30 cm diameter, on specimens of pure soil and 5% blend, compacted in a metallic box inside the Soil Mechanics Laboratory of the Federal University of Rio Grande do Norte, Brazil. Both mechanical tests performed were conducted under inundated conditions, willing to reduce the influence of soil suction. An evaluation of the results of the tests performed shows that RPP is a fine material, with grain size distribution smaller than 0,015mm, composed mainly of silica and alumina, and particles in angular shape. The soil was characterized as a clayey sand, geologically known as a lateritic soil, with high percentages of alumina and iron oxide, and particles with rounded shape. Both the Soil and the blends presented low plasticity, while the residue showed a medium plasticity. Direct shear tests showed that the addition of RPP did not cause major changes into blends’ friction angle data, however, it was possible to note that, for the proportions studied, that is a tendency of obtain lower shear stresses for higher percentages of RPP in the blends. Both pure soil and 5% mixture showed a punching disruption for the Plate load test. For this same test, the allowable stress for 5% mixture was 44% higher than the pure soil, and smaller vertical settlement results for all stresses.
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Brazil is a country in development, rich in natural resources. In order to grow sustainably, it is necessary to Brazil to preserve its environment, which is an expressive challenge, especially to industries, such as those producing ceramic materials. This study was developed using Porcelain Tile Polishing Residue (RPP) in blends with soil to build compacted fills. This residue is a slurry generated during the polishing process of porcelain tiles and contains powdery material from the polished tile, the abrasives used during the process and cooling water. The RPP was collected from a private company located in Conde/PB and it was mixed with a sandy-clayey soil, to build the fills. Laboratorial tests were conducted with pure soil, pure RPP and blends in proportions of 5%, 10%, 15% and 20% of RPP in addition to the dry mass of pure soil. The Chemical and Physical Characterization tests performed were: specific solid weight, grain size distribution, laser analysis of grain size distribution, Atterberg limits, X ray fluorescence, X ray diffraction, scanning electron microscopy and soil compaction,. The materials and blends were also compacted and direct shear tests and plate load tests were performed. Plate load tests were conducted using a circular plate with 30 cm diameter, on specimens of pure soil and 5% blend, compacted in a metallic box inside the Soil Mechanics Laboratory of the Federal University of Rio Grande do Norte, Brazil. Both mechanical tests performed were conducted under inundated conditions, willing to reduce the influence of soil suction. An evaluation of the results of the tests performed shows that RPP is a fine material, with grain size distribution smaller than 0,015mm, composed mainly of silica and alumina, and particles in angular shape. The soil was characterized as a clayey sand, geologically known as a lateritic soil, with high percentages of alumina and iron oxide, and particles with rounded shape. Both the Soil and the blends presented low plasticity, while the residue showed a medium plasticity. Direct shear tests showed that the addition of RPP did not cause major changes into blends’ friction angle data, however, it was possible to note that, for the proportions studied, that is a tendency of obtain lower shear stresses for higher percentages of RPP in the blends. Both pure soil and 5% mixture showed a punching disruption for the Plate load test. For this same test, the allowable stress for 5% mixture was 44% higher than the pure soil, and smaller vertical settlement results for all stresses.