Optical Transfer
Mostrando 13-24 de 170 artigos, teses e dissertações.
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13. Evenmatched FCAW process in API 5L X80 steel welded joint
The evenmatched welding conditions in FCAW-G process were used in API 5L X80 steel. In this study, two joint geometries (bevel 25° and 35°) with different process parameters were used. Each type of joint was welded with one type of consumable: AWS E81T1-Ni1C (evenmatched), with variation of heat input. During welding the voltage and current varied in a ran
Mat. Res.. Publicado em: 24/01/2014
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14. Cathodic cage plasma nitriding of austenitic stainless steel (AISI 316): influence of the working pressure on the nitrided layers properties
In this work, the influence of working pressure on the characteristics of the layers produced by the nitriding treatment on the AISI 316 austenitic stainless steel surface using the Cathodic Cage Plasma Nitriding technique (CCPN) is assessed. The treatments were carried out at a temperature of 723 K for 5 hours under working pressures of 120, 250 and 500 Pa.
Mat. Res.. Publicado em: 06/12/2013
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15. Study of aluminum nitride precipitation in Fe- 3%Si steel
For good performance of electrical steels it is necessary a high magnetic induction and a low power loss when submitted to cyclic magnetization. A fine dispersion of precipitates is a key requirement in the manufacturing process of Fe- 3%Si grain oriented electrical steel. In the production of high permeability grain oriented steel precipitate particles of c
Mat. Res.. Publicado em: 11/06/2013
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16. Espectroscopia ultrarrápida do polímero semicondutor luminescente MEH-PPV com excitação no ultravioleta / Ultrafast spectroscopy of the luminescent semiconducting polymer MEH-PPV with ultraviolet excitation
The optoelectronics industry is currently undergoing a transition period in which inorganic materials are being replaced by organic materials, oligomers and polymers, in the fabrication of some types of devices. However, factors such as low efficiency and low lifetime prevent polymer based devices on entering the market definitely. The solution of these issu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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17. Simulação da dinâmica do estado excitado em semicondutores orgânicos / Simulation of the excited state dynamics in organic semiconductors
In the present work, the Monte Carlo method and the direct numerical integration of the Master Equation were employed to simulate the excitation spectral diffusion process in light emitting polymeric systems. The methodology employed a competition among the internal intra-molecular relaxation, the inter-molecular incoherent energy transfer via Förster mecha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2012
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18. Análise óptica de sistemas eletro-ópticos por meio do cálculo da função de transferência de modulação / Optical analyze of electro-optical systems by modulation transfer function calculus
Um grande número de equipamentos utilizam sistemas ópticos ou eletro-ópticos em suas estruturas, dentre esses equipamentos tem-se os microscópios, telescópios, equipamentos médicos, câmeras de satélites, entre outros. Com isso a necessidade de métodos e ferramentas que auxiliem na determinação do desempenho e da qualidade dos sistemas ópticos é
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2012
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19. NANOCOLORAÇÃO DE LIGAS DE ALUMÍNIO / NANOCOLORING OF ALUMINUM ALLOYS
The use of aluminum becomes increasing because of the lightness of this metal and its high corrosion resistance. The anodization of the aluminum is now a well known and is widely used to increase the durability of the metal. This electrochemical technique forces the growth of oxide layer. The anodized layer has the peculiarity of having the nanotubes which a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/03/2012
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20. Study of excitations in a Bose-Einstein condensate / Estudo de excitações em condenados de Bose-Einstein
In this work we study a Bose-Einstein condensate of 87Rb under the effects of an oscillatory excitation. The condensate is produced through forced evaporative cooling by radio-frequency in a harmonic magnetic trap. The excitation is generated by an oscillatory quadrupole field superimposed on the trapping potential. For a fixed value of the frequency of the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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21. SÃntese de grafeno pelo mÃtodo CVD. / Graphene Synthesis by CVD Method
The advancement and improvement of synthesis techniques and handling of materials are fundamental to understand their properties and possible forms of production and use. However, in the case of nanomaterials, problems such as structural defects, high cost and difficulty of achieving production on a large scale have yet to be solved. Inserted in this panoram
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/08/2011
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22. O empreendedorismo de base tecnológica no complexo público de pesquisa em Minas Gerais: um olhar pelo calidoscópio da Teoria Ator-Rede
This thesis aimed at understanding how and under which circumstances researchers and the Public Institutions of Science and Technology (PIST) in the state of Minas Gerais interact to develop a technology-based entrepreneurship (TBE) that takes place at the Public Complex of Scientific Research (PCSR). Thus, this work sought to describe the actions that lead
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2011
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23. Modeling radiative transfer in tropical rainforest canopies: sensitivity of simulated albedo to canopy architectural and optical parameters
Este estudo avalia a sensibilidade do albedo da superfície pelo Simulador Integrado da Biosfera (IBIS) a um conjunto de parâmetros que representam algumas propriedades arquitetônicas e óticas do dossel da floresta tropical Amazônica. Os parâmetros testados neste estudo são a orientação e refletância das folhas do dossel superior e inferior nas band
Anais da Academia Brasileira de Ciências. Publicado em: 2011-12
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24. Estudo das ressonâncias de plasmon em filmes silicatos com nanopartículas de Ag interagentes
In this work, the behavior of surface plasmon resonance from layers of silver nanoparticles embedded in silicon dioxide or on surfaces of silicon dioxide was studied. Structural properties of the produced films were characterized by transmission electron microscopy, while the optical properties were studied with a spectrophotometer. Results showed average na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011