327 resultados para Planejamento experimentos
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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The purpose of this article is to demonstrate an application of the design of block experiments via analysis and multiple linear regression in the investigation of a steel thermal treatment process with multiple responses. The study aimed to design statistical models to predict the mechanical properties in SAE 9254 draw steel wires, with diameters of 2.00 mm and 6.50 mm, after quench hardening and tempering. For this purpose, process input variables (wire diameter, processing speed, tempering temperature and polymer concentration) were investigated regarding their influence on the material tensile strength, yield point and hardness. The results revealed that the mechanical properties of the steel wire are significantly influenced by the selected variables, and analysis of variance (ANOVA) was employed to validate the design of the statistical models. Multiple linear regression allowed for an appropriate representation of the process, and graphical analysis was found to be very useful in displaying the behavior of the multiple responses.
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Pós-graduação em Engenharia de Produção - FEB
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The hardness has an important role in quality control, in research studies and metallurgical and mechanical specification, selection and comparison of various materials. This property is of extreme importance in the oil industry because it is a determining factor to ascertain the safety of the material used in pressure vessels and pipelines. Due to the inability to stop the equipment while checking the hardness, the hardness testers are widely used portable method UCI, its great advantage is the fact that an essay fast, simple realization and not be considered a non-destructive testing with a good relationship money. The objective is to determine if there is significant difference in hardness measurements between 80 and 1200 sandpaper using a portable hardness tester UCI method, the material applied in gas storage spheres composition ASTM 516 Gr 70. After determining the number of homogeneity, we performed the hardness profile to isolate the major factors influencing the hardness part: cold rolling and segregation of impurities. Factors Cooling and sanding were analyzed using the method of design of experiments (DOE), in which it was demonstrated that neither variables nor their interactions, has significant influence on the hardness measurements by portable MIC 10. This fact will lead to reduction in time and cost for surface preparation
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The search for better performance and competitive advantage in the current market scenario has made organizations keep their focus on quality planning and the use of effective techniques aimed at continuous improvement and optimization of processes and resources. The situation is not different for the painting process in the automotive industry, which has a significant amount of variables and influential external factors. This work, developed at General Motors in São José dos Campos, aims to analyze the feasibility of changing the painting process of the pickup S10 railings in the Antracite color located in the main line to the another line located in a Painting Repair Booth at the plant and, therefore, to study the possibility about reducing the window of cure for Antracite’s enamel by using Design of Experiments’ techniques. Applying this method is possible to find the best arrangement among studied factors of Painting Repair Booth that are, in this case, the Temperature, in Celsius degrees, and Skid’s Steps, in seconds, and it’s also possible to get their behavior according to quality requirements specified by GM rules for the Brightness and Paint Adhesion on the part. As a result, it can conclude that is possible to paint the S10 Antracite railings in the painting process’ line of Painting Repair Booth, and with the new configuration obtained by the Design of Experiments for the process variables, there are significant gains related to the parts’ quality, costs reduction and the optimization of production capacity, much in the main line as in the line of the Painting Repair Booth
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Pós-graduação em Biometria - IBB
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Ciência da Computação - IBILCE
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Avaliar efeitos de interações é um dos principais objetivos dos experimentos fatoriais. em experimentos com dois fatores A e B, com m e n níveis de cada fator, respectivamente, há m x n possíveis interações e (m-1)(n-1) graus de liberdade associados. Freqüentemente somente parte dessas interações contribui efetivamente para a Soma de Quadrados da Interação e pode ser interessante examiná-las. O uso de nível de significância menos rigoroso para interpretação do efeito da interação por experimento, em relação às demais fontes de variação da análise de variância, pode captar efeitos importantes. Recomenda-se o uso de p = 0,25 para a interpretação do efeito da interação por experimento, mantendo-se o usual p = 0,05 para efeitos por comparações. Mesmo no caso de interações significativas, comparações selecionadas, em lugar de apenas cortes, podem auxiliar a interpretação de interações complexas.
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O conhecimento da variação espacial de atributos do solo pode contribuir para o planejamento e a otimização na condução de experimentos e de lavouras comerciais, objetivando a agricultura de precisão. O objetivo deste trabalho foi avaliar a necessidade de fertilizante e calcário para implantação da agricultura de precisão, com base no comportamento espacial de atributos químicos de um Latossolo após o corte da cana-planta. Os dados foram avaliados pela estatística descritiva e análise da dependência espacial, com base no ajuste de semivariogramas. As técnicas de geoestatísticas apresentam-se como ferramentas auxiliares na aplicação de fertilizantes por meio de taxa variada, detectando, para a área em estudo, que não se recomenda a aplicação de fósforo e calagem por taxa variada.
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This work describes the establishment of dissolution test conditions for 75 mg cinnarizine capsules using a multivariate approach. A 2³ full factorial design was carried out to achieve the best conditions and HCl 0.1 mol L-1 as dissolution medium, basket as apparatus at 100 rpm and collect time at 30 min were considered adequate. The quantification was carried out by spectrophotometry at 251 nm. Both dissolution procedure and analytical method were validated and all parameters were within the acceptable limits. Since there is no official monograph for this pharmaceutical product, this dissolution test could be applied for quality control routine.
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Short review about the main aspects of prodrug design, as its objectives, applicability and importance, showing the new trends in the research for selective latent forms, namely targeted drugs.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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A review of some articles on thought experiments shows that the use of these tools as resources seems to be very useful in understanding some phenomena that are very difficult to be observed in a real laboratory. In this paper we present an analysis and discussion about the very characteristics of though experiments as a potential instrument for physics teaching.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)