Superconductive
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Uma contribuição ao estudo de limitadores de corrente elétrica supercondutores usando transformador e fita supercondutora de alta temperatura crítica / A contribution to the study of superconductive fault current limiters using transformer and high critical temperature superconductive tape
Esta dissertação apresenta um estudo sobre limitadores de corrente elétrica supercondutores que funcionam com um transformador e com material supercondutor de alta temperatura crítica (HTS) em forma de fita. Neste caso utilizou-se a fita supercondutora do composto de YBCO. Neste trabalho é apresentado um resumo da evolução da supercondutividade desde
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2011
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2. Diffusion weighted imaging in the detection of upper urinary tract urothelial tumors
PURPOSE: Diffusion-weighted (DW) magnetic resonance imaging (MRI) provides information about the biophysical properties of tissues such as cell organization and density. DW imaging (DWI) is becoming important in the assessment of malignant tumors. The purpose of our study was to evaluate the capability and reliability of DWI in the evaluation of upper urinar
International braz j urol. Publicado em: 2010-02
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3. Pinning of Abrikosov Vorticein MG B IND. 2 addition of NI nanoparticles / Aprisionamento dos Vortices de Abrikosov no MG B IND. 2 atraves da adição de nanoparticulas de NI
Since the discovery of the phenomenon of superconductivity in magnesium diboride (MgB2) in the year 2001, the vortex dynamics in this material has been widely studied, because this phenomenon can cause the destruction of the superconducting state. This study intends to assess the impact on the pinning of vortex and the behavior of the critical current densit
Publicado em: 2008
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4. Towards new states of matter
A linear realization of flavor SU (3) × SU (3) symmetry is developped with scalar and pseudoscalar mesons coupled to baryons and massive vector fields. This system may be also coupled to colored quarks and gluons, which are expected to be deconfined above a critical range of energy densities and seemingly inside baryons. The coupling to vector fields may le
Brazilian Journal of Physics. Publicado em: 2004-09
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5. Magnetic and transport properties of PdH: intriguing superconductive observations
Since the discovery of superconductivity in palladium-hydrogen (PdH) and its isotopes (D,T) at low temperature, several efforts have been made to study the properties of this system. Superconductivity of PdH system has been initially claimed by resistance drop versus temperature and then confi rmed by dc magnetic susceptibility measurements. These studies ha
Brazilian Journal of Physics. Publicado em: 2004-09
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6. Bose-Einstein condensation in a constant magnetic field
We discuss the occurrence of Bose-Einstein condensation in systems of noninteracting charged particles in three and one dimensions and in presence of an external magnetic field. In the one dimensional, as well as in the magnetic field cases, although not a critical temperature, a characteristic temperature can be found, corresponding to the case in which the
Brazilian Journal of Physics. Publicado em: 2000-06
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7. Supercondutividade e antiferromagnetismo em um modelo de Hubbard estendido
We study an extended Hubbard model, for the one band, square lattice case. We include both, the nearest neighbor direct and correlated hopping Coulomb terms. Within a generalized Hartree-Fock scheme we obtain superconductive solutions. Those solutions may be either non magnetic or antiferromagnetic (Néel-like). A necessary condition between parameters of th
Publicado em: 1992
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8. Filamentary microstructure and linear temperature dependence of normal state transport in optimized high temperature superconductors
A filamentary model of “metallic” conduction in layered high temperature superconductive cuprates explains the concurrence of normal state resistivities (Hall mobilities) linear in T (T−2) with optimized superconductivity. The model predicts the lowest temperature T0 for which linearity holds and it also predicts the maximum superconductive transition
The National Academy of Sciences of the USA.
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9. INTEGRATED MAGNETIC AND SUPERCONDUCTIVE MEMORIES
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10. Magnetic order and energetics of dipolar coupling in magnetic superconductors
The exact (not just nearest-neighbor) dipolar coupling energy densities for the observed structures of the rare earth Chevrel compounds are calculated by the method of Luttinger and Tisza. The dipolar coupling energy density for the most probable spin configuration is comparable to the observed magnetic transition temperature, TM, but the most probable groun
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11. Different central manifestations in response to electroacupuncture at analgesic and nonanalgesic acupoints in rats: a manganese-enhanced functional magnetic resonance imaging study
Acupuncture analgesia is an important issue in veterinary medicine. This study was designed to elucidate central modulation effects in response to electroacupuncture (EA) at different acupoints. Manganese-enhanced functional magnetic resonance imaging was performed in Sprague-Dawley rats after sham acupuncture, sham EA, or true EA at somatic acupoints. The a
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12. Assessment of right ventricular regional contraction and comparison with the left ventricle in normal humans: a cine magnetic resonance study with presaturation myocardial tagging.
OBJECTIVE--Right ventricular regional contractility has been thought to be difficult to assess precisely. Cine magnetic resonance imaging with presaturation myocardial tagging was employed to quantitate the contraction of the right ventricular free wall and to identify normal performance compared with the left ventricle. METHODS--Nine normal volunteers, aged