Dissertações em Engenharia Mecânica (Mestrado) - PPGEM/UNICAMP
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/9630
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Item Acesso aberto (Open Access) Práticas do pensamento enxuto em ambientes administrativos: aplicação na divisão de suprimentos de um hospital público(Universidade Estadual de Campinas, 2007-03-21) LIMA, Adalberto da Cruz; LIMA, Paulo Corrêa; http://lattes.cnpq.br/8631074171256726This work has for goal introduces the lean thinking implementation in ssrvices administrative environments. The studied environment has like characteristic in the Material Supplies area, of public hospital. For so much, it used of the scientific methodology through the research-action strategy and of the modern managerial administration systems integration, suches like: Quality magement system, magement information system and magement system people like support base to the philosophy lean thinking implementation. The research study period, it began in 2003 and extended until final of 2005, with perfect interaction between researcher and the involved subjects. The found results were going collected and analyzed through technical of research for observation participate. Collaborators' participation was very important for the lean thinking implementation success in this sector. The data were going compiled in graphific of control for changes evaluation obtained along the project, changes in the organizacional structure and managerial also introduced significant results, as well as the results in the acquisition process. The work provided to the Supplies Division collaborators, they try new forms of managing the administrative process, fact this very debated.Item Acesso aberto (Open Access) Análise dos parâmetros de influência na qualidade superficial de lingotes(Universidade Estadual de Campinas, 1992) QUARESMA, José Maria do Vale; GARCIA, Amauri; http://lattes.cnpq.br/1721691084829002Item Acesso aberto (Open Access) Desenvolvimento de um método para a análise da solidificação de metais superaquecidos em moldes cilíndricos refrigerados(Universidade Estadual de Campinas, 1983) MOREIRA, Antonio Luciano Seabra; SANTOS, Rezende Gomes dos; http://lattes.cnpq.br/8824197696621614This work presents a theoretical-experimental study on the solidification of metals, initially at a temperature above the melting point, in cooled cylindrical moulds. A literature survey was carried out regarding the heat transfer methods applied to solidification in metal/mould systems. Using a radial water cooled device simulating the solidification of cylindrical geometries, experimental values of the solidified thickness as function of time were obtained. A method was developed to analyse the solidification kinetics of superheated metals in cooled cylindrical moulds and the predictions furnished by this method were compared with the experimental data. Possible applications of the proposed method to the solution of practical problems in the foundry process 3re presented. Finally a comparative study of the solidification kinetics of solidified metals in plane, cylindrical and spherical geometries is presented.Item Acesso aberto (Open Access) Estudo analítico experimental de um conjunto gaseificador(Universidade Estadual de Campinas, 1983) MORAES, Sinfrônio Brito; ISMAIL, Kamal Abdel Radi; http://lattes.cnpq.br/2741276950055207The research subject proposed in this study is based on an examination of the parameters significant for the process of ascendent and counter-current gasification. The gasifier which was utilized was a module proto type. The lower module has an extenal diameter of 50 cm and an internail diameter of 42 cm, owing to the refractory and to the double walls designed for the heating of the incoming air. The upper module with an external diameter of 55 cm and an internal diameter of 50,6 cm, is similarly made of double walls in view of the extraction of gas being localized at different The two modules are joined to each other in such a way as to enable a variation in the height of the charging of the gasifier, as well as in the height of the outgoing gas. The process of gasification used in the study was that of air gas or low-BTU gas. The study was divided into two geometries by varying be tween them, the relation of the height of the outgoing gas and the diameter of the gasifier. When gas was extracted by the upper perforation with a relation δ = 3,09 it is denominated upper geometry andwhen δ=214, lower geometry. Five experimento involving different escapes of air were made for each of the geometries. Temperatus were measured at three different points of the gasifier in order to ascertain the behavior of the reaction zones according to the temperatures. The flows of air, gas, gasified coal and steam contained in the air were measured so that the analyses were made in terms of dimensional parameters. The composition of the gas was analyses chromografically in all the experiments undertaken, so as to determine the calorific potential of the gas, the percent of energy in each component of the resultant mixed gas, and the calorific power of the gasifier. In relation to the composition of air gas, the gasification behaved as if it were a mixture of water gas, owing to local ambiental condition. The composition presented, on analysis, parts of hydrogen and methane, thus contributing to an increase in the heating power of the gas and consequently, an increase in the heating potential of the gasifier.