Fe Devices
Mostrando 13-24 de 32 artigos, teses e dissertações.
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13. Caracterização química elementar e identificação de fontes de obsidianas utilizando fluorescência de raios X com equipamento portátil (PXRF)
The study of archaeological and cultural heritage artifacts by means of analytical techniques with portable equipment has become increasingly routinely today. Various types of portable EDXRF equipment have been used in many different situations involving in situ analysis covering a wide range of geometries, detectors, current and voltage applied in the X-ray
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2010
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14. Microssensores magnéticos tipo fluxgate planar utilizando ligas de NiFe eletrodepositadas / Planar microfluxgates using NiFe eletrodeposited cores.
This work present the development of fluxgate magnetic field sensors based on planar technology. The material for the core of the device is based on early works that determined the best NiFe electrodeposition parameters for this application. Functional devices were created proving the usability of the alloy. Also 4 new layouts were proposed in order to build
Publicado em: 2010
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15. Propriedades fisicas do monocristal fe/mgo(100) e estudo da expansao termica da superficie da ag(100)
In this work we have developed a way to grow Fe/MgO(100) monocrystals by magnetron sputtering DC. We investigated the growing in a temperature range among 100 oC and 300 oC. Structural and magneto-crystalline properties were studied by dierent experimental techniques. Thickness and surface roughness of the lms were investigated by atomic force microscopy, wh
Publicado em: 2010
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16. Investigation of structural, electronic and magnetica properties of Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3 oxides / Investigação as propriedades estruturais, eletronicas e magneticas dos oxidos Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3
For many decades the transition metal oxides are subject of great scientific interest because of the wide variety of interesting physical properties and their potential technological applications. More recently, for example, oxides of transition metals with multiferroic properties have been considered as potential magneto-electronic devices. Many transition
Publicado em: 2010
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17. Efeitos de campo cristalino e rattling modes em skutterudites / Crystal field and rattling mode effects in skutterudites
This thesis addresses the general problem of crystall field effects and rattling modes in skut- terudite compounds. It employs, predominantly, the electron spin resonance technique (ESR or EPR, in the classical literature) aiming to probe the local point symmetry of the electronic states associated to the rare earth ions and the inohomogenities implied by th
Publicado em: 2010
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18. Numerus clausus dos direitos reais e autonomia nos contratos de disposição / Numerus Clausus of property rights in rem and autonomy in exchange contracts
My dissertation focuses on a legal regime generally referred to as \"numerus clausus of property rights\". It does so by examining three main aspects of the theme. First of all it analyses the function of that legal regime, which is the source of its perceived legitimacy nowadays. This function consists in tendering for buyers a welldefined catalogue describ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/05/2009
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19. Development of field emission devices fabricated by HI-PS technique. / Desenvolvimento de dispositivos de emissão por efeito de campo elétrico fabricados pela técnica HI-PS.
Um novo processo de fabricação de dispositivos de emissão de campo (FE) em silício (Si) é apresentado nesta tese, baseado na potencialidade de utilização da técnica de microusinagem denominada HI-PS (Hydrogen Ion Porous Silicon), que trata da combinação entre processos de implantação de hidrogênio e silício poroso. Por meio do procedimento prop
Publicado em: 2008
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20. Construction and evaluation of microsystems for flow analysis / Construção e avaliação de microssistemas para analise em fluxo
This work describes the construction, characterization and application of microsystems for flow analysis. Laser ablation was employed for the development of a system in poly(methylmethacrylate), whose channels, with rectangular cross sections measuring 200 mm width by 4,5 mm depth, were sealed with an adhesive plastic film. This device supported flow rates u
Publicado em: 2008
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21. Synthesis and study of the structural and dietectil properties of ceramic matrix composites the base of: for use in eletronic devices / SÃntese e estudo das propriedades estruturais e dielÃtricas de matrizes cerÃmicas compÃsitas (CMC) baseadas em: (Fe1/4Cu1/8Ti3/8)2O3 / (Fe5/8Cr3/8)2O3 / Pb(Fe1/2Nb1/2)O3 / CaTiO3 para uso em dispositivos eletrÃnicos
Neste trabalho utilizou-se reaÃÃes do estado sÃlido com sucesso na produÃÃo de matrizes cerÃmicos compositas a base de Cr0,75Fe1,25O3(CRFO100), Fe0,5Cu0,75Ti0,75O3(FCTO100), Pb(Fe0,5Nb0,5O3) (PFN100) e CaTiO3 (CTO), para o estudo de suas propriedades estruturais e elÃtricas visando o seu possivel uso em circuitaria eletrÃnica, de rÃdio-frequencia e
Publicado em: 2008
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22. Estudo das propriedades estruturais e elÃtricas das granadas ferrimagnÃticas GdIGXYIG1-X e suas aplicaÃÃes em componentes de microondas. / Study of the strutural and electric properties of garnets ferrimagnetc GdIGXYIG1-X and its aplications in componentes of microwaves.
Due to a fast progress in the development of communication systems, the dielectric and magnetic ceramics (ferrites) have become attractive to be used in devices. Although the ferrites of the spinel type were the first material used in the microwave range, garnets have smaller dielectric losses and, therefore, are chosen for many applications. High demands fo
Publicado em: 2008
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23. Insconsciente e educação : implicações da psicanálise na formação do pedagogo
The way that the pedagogy has to understand the education is based on lines of direction that estimate to the teacher a national common base: the act to teach. The resume if it supports, mainly, in a formation of theoretical, practical and logic of the method matrix aiming at shape the profile of teacher ideal in the scope of the capitalist society of centur
Publicado em: 2008
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24. Ligas magnéticas NiFe e NiFeCo eletrodepositadas, voltadas para aplicações em micro-sensores magnéticos tipo fluxgate planar / Electrodeposited NiFe and NiFeCo films for planar fluxgate sensors
This work presents the results about the fabrication and characterization of thin films of NiFe and NiFeCo alloys. The attempts to construct the planar fluxgate are also presented. Galvanostatic electrodeposition using an electrolytic solution containing Ni and Fe was used: NiSO4 (0,7 mol/l); NiCl2 (0,02 mol/l); FeSO4 (0,03 mol/l); H3BO3 (0,4 mol/l) and C7H5
Publicado em: 2007