Static Magnetic Field
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Propriedades magneticas de filmes de ligas GD-Cr / Magnetic properties of Gd-Cr alloy films
Vapor condensation techniques are very useful for preparation of alloys whose components have no mutual solubility under equilibrium conditions In this work, one of these techniques ? sputtering ? has been used to fabricate metastable GdXCr1-X alloys whose magnetic properties were investigated as a function of the Gd concentration, x. Grazing incidence angle
Publicado em: 2008
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14. Acionamento vetorial de motores de indução trifásicos com enfraque-cimento de campo e maximização do conjugado por ampère
This work investigates the operation of three phase induction motors in field weakening and high speed regions. Maximum torque per ampère is imposed by using an indirect vector control strategy. Mathematical models that accounts for magnetic saturation is used for simulations and adjustment of controllers used in control algorithm. The driving structure is
Publicado em: 2008
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15. Transição ordem-desordem da matéria de vórtices em supercondutores detectada através do terceiro harmônico da suscetibilidade AC
Although a vortex state, in type II superconductors, has been anticipated more than 50 years ago, a great deal of theoretical and experimental efforts has still been done in an attempt to investigate how the dynamics of these structures depends on external excitations and on the inherent properties of the underlying superconducting material, such as inhomoge
Publicado em: 2008
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16. Avaliação da aplicação de um campo magnético permanente sepultado em área de enxerto ósseo alógeno e dento-alveolar : estudo experimental em ratos
Proposição: O presente trabalho propõe o estudo histológico descritivo da aplicação de um campo magnético sepultado, estático e permanente em área de enxerto ósseo alógeno liofilizado e dento-alveolar associada a defeito cirúrgico em mandíbulas de ratos. Metodologia: estudo experimental in vivo, randomizado. Amostra foi composta por 21 ratos, da
Publicado em: 2008
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17. AlteraÃÃes fisiolÃgicas em Saccharomyces cerevisiae submetida a campo eletromagnÃtico estÃtico
The objective of this study was to investigate the influence of static non-homogeneous magnetic fields on the physiology of the yeast S. cerevisiae growing in culture media containing glucose. The fermentations were driven into biorreators with magnetic rods produced with NdFeB (Neodymium-iron-boron) alloy, of 0.5â diameter and 0.25â thickness (model 27DNE
Publicado em: 2007
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18. MAGNETOIMPEDÂNCIA E DINÂMICA DA MAGNETIZAÇÃO EM NANOESTRUTURAS FERROMAGNETO / Cu (Ag) / FERROMAGNETO
In this work the static and dynamic magnetic properties are investigated in FM/i/Cu(Ag)/i/FM tri-layer structured samples where FM is the ferromagnetic multilayer and i is the SiO2 isolating layer. All samples have been deposited by magnetron sputtering on a glass substrate with a 50 Å Ta buffer layer. The models proposed by L. Spinu for the calculus of the
Publicado em: 2007
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19. Effects of static magnetic field exposure on hematological and biochemical parameters in rats
Este estudo foi realizado com o obejtivo de investigar os efeitos do campo magnético estático (CMS) nas taxas de crescimento, hematopoiese, concentrações de proteínas plasmáticas, glicemia, da desidrogenase lática (DHL) e transaminases (alanina aminotransferase-ALT e aspartato aminotransferase-AST) em ratos machos. Após exposição de modo sub-agudo
Brazilian Archives of Biology and Technology. Publicado em: 2006-11
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20. Effect of a magnetic field on tunneling conductance in normal metal d-wave superconductor interfaces
Through the analytic solutions of the Bogoliubov de Gennes (BdG) equations the effect of a static and homogeneous magnetic field applied parallel to the interface of an NIS (N: Normal metal, S: superconductor and I: Insulator) junction on the differential conductance is calculated. For a d xy - symmetry we obtain zero bias conductance peak that can be split
Brazilian Journal of Physics. Publicado em: 2006-09
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21. FIRST-ORDER TRANSITION IN THE FERMIONIC ISING SPIN GLASS MODEL IN A TRANSVERSE FIELD / TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO
The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic fields. The transverse field is a spin "flip" mechanism and inserts quantum fluctuations, which can lead the transition temperature Tj t
Publicado em: 2006
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22. Effects of torsion on electromagnetic fields
In this work, we investigate the effects of torsion on electromagnetic fields. As a model spacetime, endowed with both curvature and torsion, we choose a generalization of the cosmic string, the cosmic dislocation. Maxwell's equations in the spacetime of a cosmic dislocation are then solved, considering both the case of a static, uniform, charge distribution
Brazilian Journal of Physics. Publicado em: 2005-09
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23. Franz-Keldysh effect in semiconductor T-wire in applied magnetic field
We have calculated the optical absorption spectra of magnetoexcitons in T-wire semiconductor. It is calculated using the semiconductor Bloch equations in time and real-space domains. The peak and the linewitdth of the fundamental exciton transition are investigated as a function of the applied magnetic and static electric field. The latter is applied along t
Brazilian Journal of Physics. Publicado em: 2004-06
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24. STUDY OF THE STRUCTURAL AND MAGNETIC PROPERTIES OF Zn1-xMnxIn2Se4 SYSTEM / ESTUDO DAS PROPRIEDADES ESTRUTURAIS E MAGNÉTICAS DO SISTEMA Zn1-xMnxIn2Se4
This work reports a systematic study on the crystal growth and magnetic and structural properties of the diluted magnetic semiconductors (SMD) Zn1-xMnxIn2Se4. Crystals with Mn concentrations $0leqslant xleqslant 1.00$ were grown by chemical vapour transport (CVT). Through x-ray powder diffraction patterns and Laue diagrams of single crystal we studied the tr
Publicado em: 2004