486 resultados para Plantadeiras (Maquinas agricolas)


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Agronomia (Proteção de Plantas) - FCA

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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

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Pós-graduação em Ciência e Tecnologia Animal - FEIS

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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

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Esta pesquisa analisou as diversas soluções para atenuar os níveis de ruído dos tratores e propor um projeto de redução do ruído na sua fonte. Para tal, se propôs projetar, executar e testar alterações em componentes mecânicos causadores de ruído nos tratores, fazendo com que esses níveis se enquadrem em valores considerados salubres. Todas alterações e ensaios foram executados num trator Massey Ferguson MF 290. Para a redução do ruído foram atacados as 3 fontes principais de ruído do trator : o sistema de exaustão de gases, a hélice do sistema de arrefecimento e o sistema de admissão de ar. Como conclusão final pode-se afirmar que é possível atenuar o ruído de tratores agrícolas até níveis salubres (que não causem perda de audição a seus operadores), atuando-se exclusivamente nas fontes de ruído (motor e seus acessórios).

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The objective of this work is to analyze teaching situations with the use of calculator inside classroom aiming to understand its function and potential to the learning of Mathematics. A survey was carried out about the students and teachers’ conceptions concerning the use of calculator as an auxiliary tool in the learning of Math . The first part of the research is based by means of official documents (Parâmetros Curriculares Nacionais (PCN) , Proposta Curricular do Estado de São Paulo, Guia do Programa Nacional do Livro Didático (PNLD)) , researches and other publications , characterizing by a bibliographic study. The survey with the participants— Math students and teachers acting in public or private schools of São Paulo state— was done through a questionnaire and interviews . The results show that most part of interviewed people are in favor of the use of calculator in the classroom . However , a big part of this number still consider it only as a tool to speed calculations with high numbers or decimals . It was verified that teachers who have recently graduated and have taught for a short period of time accept and comprehend the role of calculator more easily in some activities and consider it as an useful and auxiliary tool to the students’ learning

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In heavy machining industries, a critical point that must be taken into account is setup. Because the characteristics of machine tools and parts to be machined, usually pieces robust and large, the preparation of these parts must be made accurately for machining has a good result as planned. As a result of the difficulty raised in the setup machining of heavy parts, companies in this segment seek alternatives to reduce the unproductive time caused by setup and optimize machining processes. One way was found that these companies create operating instructions that describe and standardize the operation between its employees, as well as deploy a control machining times to measure the unproductive time caused by the setup. This work studied a new system for the realization of centering and alignment of Rotating Deck R-9350 in CNC Milling Machine PAMA Speedram 3000, in Liebherr Brazil company. The part Rotating Deck R-9350 is a critical part in which its machining in PAMA Milling Machine is made in three phases and their setup times are quite high and involve stopping the machine. It has been tested and proposed a solution to the realization of this part of the setup without the use of the machine, but of the measuring instrument three-dimensional Laser tracker, with which the machine continued to work, while he was in the centering and alignment of other parts. It was noted that the instrument technically attended the need and it was possible to perform this operation more accurately

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In contrast to what happened in the past where it was possible to select which species had a lower degree of variation, it is now necessary to use fast-growing species with efficient processing. For that we use the wood of Eucalyptus sp and studies related to the machining processes and their parameters such as wear of cutting tools and roughness. The present work aims to analyze the influence of geometry of cutting tools of high speed steel and the influence of the diameter of the final pieces in the process of turning wood of Eucalyptus sp in relation to power consumption, roughness, temperature machining, chip formed and wear of cutting tools. It was observed that the smaller the diameter of the end parts and greater wear of the tools, the worse quality of the machined surfaces and the greater the power consumed in the process of machining

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The aim of this research project is to analyze the spatial productive circuit and circles of cooperation of Fairtrade coffee, taking as a case of study the Associação dos Agricultores Familiares do Córrego D'antas (ASSODANTAS), Poços de Caldas - MG. The main purpose is to analyze material flows (grains, supplies, etc.) established between geographically separated stages of production (production, exchange, distribution and consumption) and the relationships between the agents in order to analyze the organization and regulation of production of Fairtrade coffee. It is understood as the insertion of the Fairtrade ASSODANTAS to permit the creation of new production lines, adding value and providing greater identity and autonomy to their small farms, when compared with traditional coffee trade commodity