Eddy Current
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Desenvolvimento de técnicas para avaliação de combustíveis nucleares tipo placa pelo método de ensaio por ultra-som
One of the most important steps in the fabrication processes of plate type nuclear fuels, intended to be used in research reactors or naval propulsion, is the development of nondestructive testing (NDT) methods and techniques for their quality assessment during fabrication and post-irradiation analysis. Those tests can contribute to detect discontinuities su
Publicado em: 2008
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14. Análise numérica e experimental dos efeitos da não-uniformidade da espessura em cascas finas cilíndricas rotativas. / Numerical and experimental analysis of the thickness non-uniformity effects in rotating circular cylindrical shells.
Circular cylindrical shells with small thickness variations along their body, when submitted to rotation, present, in some cases, elastic displacements of their outside surface induced by centrifugal forces leading to final oval like shapes. The main purpose of this study is to establish relationships between thickness variation of the cylindrical shells wit
Publicado em: 2007
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15. Análise numérica do escoamento em uma sala retangular ventilada por um jato horizontal de parede
The present work investigates the three-dimensional turbulent airflow in a room ventilated by a horizontal wall jet. The geometry of Nielsen s experiment (Nielsen et al., 1978), for which experimental and numerical results for some turbulence models are available in the current literature, has been adopted in this work. This experiment consists of a rectangu
Publicado em: 2007
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16. Combined Micro-Hardness and Eddy Currents Applied to the Study of Steel Decarburizing
Carbon is the most important element going in the steels composition since it largely contributes to their mechanical performance. During the heat treatment of steels, a part of atoms of carbon could be removed from the superficial zone of the steel, which is the result of the atmospheric oxygen attraction by forming gaseous carbon monoxide. This phenomenon,
Matéria (Rio J.). Publicado em: 2006
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17. An estimate of the magnetic lossesin reactors with natural saturation / Uma estimativa das perdas magnÃticas em reatores com saturaÃÃo natural
This work has the purpose of showing an estimate of the modeling of power dissipated in ferromagnetic structures with profoundly saturated parts, through the behavior of the magnetic induction wave form experimented in many parts of the structure when used in saturated reactors. For each one of the analyzed prototypes, the bonding forms of the primary windin
Publicado em: 2006
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18. A new current transformer model
This paper presents a current transformer model that is useful on low frequency applications. To describe the iron core magnetic behaviour of the iron core, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are represented by linear and nonlinear
Sba: Controle & Automação Sociedade Brasileira de Automatica. Publicado em: 2005-09
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19. Separation of a midlevel density current from the bottom of a continental slope
The high-salinity water flowing out of the Mediterranean Sea descends to mid depths in the density-stratified ocean, continues as a narrow jet along the Iberian continental slope, and intermittently detaches large-scale eddies (called “Meddies”). This process is important because it maintains the relatively high mean salinity of a major water mass (
The National Academy of Sciences.
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20. Molecular patterns of X chromosome-linked color vision genes among 134 men of European ancestry.
We used Southern blot hybridization to study X chromosome-linked color vision genes encoding the apoproteins of red and green visual pigments in 134 unselected Caucasian men. One hundred and thirteen individuals (84.3%) had a normal arrangement of their color vision pigment genes. All had one red pigment gene; the number of green pigment genes ranged from on