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Simulating the Effects of Substrate Pre-Heating on the Final Structure of Steel Parts Built by Laser Powder Deposition
Tool steel parts built by laser powder deposition often present a heterogeneous distribution of
properties caused by the complex structural transformations that occur during the deposition
process. A model describing these transformations has been developed. It couples finite element
heat transfer calculations with transformation kinetic theory to predict the final microstructure
and properties of the material and their variation across a laser powder deposited part.
Pre-heating is often used to reduce the residual stresses and the risk of thermal distortion and
cracking. However, this changes the heat transfer conditions and affects the final microstructure
and properties. In this work the proposed model was used to evaluate the effects of substrate preheating on the final hardness distribution. The results show that the final hardness depends
considerably on the initial temperature of the substrate.Mechanical Engineerin
Targeting of anionic membrane species by lanthanide(III) complexes: towards improved MRI contrast agents for apoptosis
No abstract available
Building analytical three-field cosmological models
A difficult task to deal with is the analytical treatment of models composed
by three real scalar fields, once their equations of motion are in general
coupled and hard to be integrated. In order to overcome this problem we
introduce a methodology to construct three-field models based on the so-called
"extension method". The fundamental idea of the procedure is to combine three
one-field systems in a non-trivial way, to construct an effective three scalar
field model. An interesting scenario where the method can be implemented is
within inflationary models, where the Einstein-Hilbert Lagrangian is coupled
with the scalar field Lagrangian. We exemplify how a new model constructed from
our method can lead to non-trivial behaviors for cosmological parameters.Comment: 11 pages, and 3 figures, updated version published in EPJ
Desempenho econômico das unidades familiares de produção com abundância de terra e trabalho em Capitão Poço, Pará.
bitstream/item/63045/1/Oriental-Doc40.pd
Dinâmica do investimento em trabalho nas unidades agrÃcolas familiares com restrição de terra e abundância de trabalho, em Capitão Poço, Pará.
bitstream/item/63214/1/Oriental-Doc47.pd
O investimento como fundamento de maximização da eficiência reprodutiva das unidades familiares com restrição de terra e trabalho, em Capitão Poço, Pará.
bitstream/item/57391/1/CPATU-Doc137.pd
Eficiência econômica das unidades agrÃcolas familiares com restrição de terra e abundância de trabalho em Capitão Poço, Pará.
bitstream/item/63213/1/Oriental-Doc46.pd
Reprodutibilidade das unidades agrÃcolas familiares com abundância de terra e restrição de trabalho em Capitão Poço, Pará.
bitstream/item/63063/1/Oriental-Doc42.pd
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