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Mostrando 25-36 de 163 artigos, teses e dissertações.
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25. A Study on Formation Process of Secondary Upsetting Defect in Electric Upsetting and Optimization of Processing Parameters Based on Multi-Field Coupling FEM
The electric upsetting process is an excellent electrically assisted preforming technique with electrical-thermal-mechanical multi-field coupling characteristic. The secondary upsetting defect in electric upsetting with inappropriate parameters combinations could result in folds in subsequent forging process. In order to analyze the formation process of the
Mat. Res.. Publicado em: 04/07/2016
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26. Design, Prototyping and Measurement of a Cascaded 6-GHz Frequency Selective Surface Array
ABSTRACT The design, prototyping, and free-space measurement of a 6-GHz Frequency Selective Surface filter is presented. The prototyping resolution of a large (A4 sheet size) Frequency Selective Surface with small loops as elements is checked, as well as the correlation with measurements performed with a 3-D full-wave solver. The test also involved the effec
J. Aerosp. Technol. Manag.. Publicado em: 2016-06
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27. Simulation of diets for dairy goats and growing doelings using nonlinear optimization procedures
ABSTRACT The objective of this study was to simulate total dry matter intake and cost of diets optimized by nonlinear programming to meet the nutritional requirements of dairy does and growing doelings. The mathematical model was programmed in a Microsoft Excel(r) spreadsheet. Increasing values of body mass and average daily weight gain for growing doelings
R. Bras. Zootec.. Publicado em: 2016-02
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28. A Computational Modeling for Semi-Coupled Multiphase Flow in Atmospheric Icing Conditions
ABSTRACT: A two-dimensional second-order positivity-preserving finite volume upwind scheme is developed for a semi-coupled algorithm involving the air and droplet flow fields in the Eulerian frame, which shares the grid for each phase. Special emphasis is placed on the computational modeling, which is induced from a strongly-coupled algorithm that satisfies
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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29. MRP OPTIMIZATION MODEL FOR A PRODUCTION SYSTEM WITH REMANUFACTURING
Science and technology practitioners have been studying how to take economical, social and environmental advantage of industrial residuals and discarded products. In this sense, this paper presents a Material Requirements Planning (MRP) optimization model for a particular production system that, besides manufacturing a final product and its main assembling c
Pesqui. Oper.. Publicado em: 2015-08
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30. EFFECT OF ROTATION RATES ON THE LAMINAR FLOW AND HEAT TRANSFER PAST A CIRCULAR CYLINDER
AbstractIn this work, forced convection heat transfer past a rotating circular cylinder with a constant non-dimensional rotation rate α varying from 0 to 6 was investigated for Reynolds numbers of 20-200 and a Prandtl number of 0.7. The numerical calculations are carried out by using a finite-volume method based commercial computational fluid dynamics solve
Braz. J. Chem. Eng.. Publicado em: 2015-06
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31. Accuracy of Nonlinear Formulation of Broiler Diets: Maximizing Profits
Nutritionists need to make commercial decisions about the optimal nutrient content broiler feeds. In order to demonstrate that broiler prices may influence dietary nutrient density, this study developed quadratic feed intake and weight gain equations, according to broiler sex and feeding phase, to be applied in a nonlinear feed formulation model. Four hundre
Rev. Bras. Cienc. Avic.. Publicado em: 2015-06
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32. Equações obtidas a partir das leis de conservação para dimensionamento de drenos subterrâneos
Neste trabalho se obteve uma expressão algébrica para o modelo de Dumm através do qual se descrevem suas soluções por meio de algoritmo geométrico. Utilizaram-se as técnicas de identificação de padrões potenciais, hiperbólicos, lineares e exponenciais, por intermédio de representações em gráficos monolog e dilog visando definir estratégias de
Rev. bras. eng. agríc. ambient.. Publicado em: 2014-12
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33. Study of Conservation on Implicit Techniques for Unstructured Finite Volume Navier-Stokes Solvers
ABSTRACT: The work is a study of conservation on linearization techniques of time-marching schemes for the unstructured finite volume Reynolds-averaged Navier-Stokes formulation. The solver used in this work calculates the numerical flux applying an upwind discretization based on the flux vector splitting scheme. This numerical treatment results in a very la
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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34. Characterization of the radiation pattern of antennas via FDTD and time-domain moment expansion
An alternative method is proposed to characterize the radiation pattern of antennas from an impulse response, based on a moment expansion together with a frequency domain near-to-far-field transformation via a FDTD/CPML solver. The approach introduced in the present work is intended for printed antenna analysis in special cases when the geometries to be mode
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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35. Cultivo hidropônico de cultivares de alface em soluções nutritivas organominerais otimizadas com a ferramenta SOLVER
Objetivou-se, com este trabalho, avaliar o cultivo de cultivares de alface em sistema hidropônico tipo floating com soluções nutritivas otimizadas pela ferramenta SOLVER, do Microsoft Office Excel. O experimento foi conduzido no Centro de Ciências Agrárias e Ambientais da Universidade Estadual da Paraíba adotando-se o delineamento experimental inteiram
Rev. bras. eng. agríc. ambient.. Publicado em: 2014-04
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36. PIC simulation study of a 35 GHz, 200 kW Gyroklystron
A three-dimensional PIC simulation of a 35 GHz, 200 kW two cavity gyroklystron amplifier has been performed to study the electron beam and RF wave interaction behavior using a commercial PIC code 'MAGIC'. The electromagnetic field analysis of the RF structure in the absence of the electron beam and beam-wave interaction study in the presence of the electron
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12