Anisotropies
Mostrando 1-12 de 44 artigos, teses e dissertações.
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1. New evidence of visual space anisotropy with auto-stereograms
Numerous research efforts have been directed toward determining the origin of anisotropies of visual space, in contrast to real space. Recent neurophysiological studies have placed the origin in the primary visual cortex (V1) or beyond. The present study sought to provide new psychophysical evidence of the origin of these anisotropies using auto-stereograms
Psychol. Neurosci.. Publicado em: 2014-12
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2. Anisotropias magnéticas em filmes finos de Co: Uma análise por magnetometria de torque / Magnetic anisotropies in Co thin films:An analysis by torque magnetometry
By studying the magnetic behavior of materials a very important parameter to be analyzed are the constants of anisotropy. They can be associated with an effective anisotropy energy or to a more specific one as, for example, the magnetocrystalline. During the thin films deposition by magnetron sputtering, an uniaxial effective anisotropy can be induced due to
Publicado em: 2010
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3. Estudo por ressonância ferromagnética das anisotropias uniaxial e unidirecional em bicamadas e tricamadas magnéticas / Ferromagnetic resonance study of the anisotropies uniaxial and unidirectional magnetic bilayer and tricamadas
A técnica de ressonância ferromagnética (FMR) foi utilizada para estudar propriedades magnéticas de bicamadas NiO/Co, NiO/Py e Py/FeMn (Py = Ni81Fe19) e tricamadas Co/NiO/Co, com diferentes espessuras das camadas ferromagnética e antiferromagnética, depositadas pela técnica de dc magnetron sputtering na presença de campo magnético de 400 Oe. Os expe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2009
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4. Ferromagnetic resonance study of the anisotropies uniaxial and unidirectional magnetic bilayer and tricamadas / Estudo por ressonância ferromagnética das anisotropias uniaxial e unidirecional em bicamadas e tricamadas magnéticas
The Ferromagnetic Resonance (FMR) technique at the X-band (~ 9.70 GHz) and Q-band (~ 34.0 GHz) was used to study the magnetic properties of NiO/Co, NiO/Py and Py/FeMn bilayers, and Co/NiO/Co trilayers with different thicknesses, deposited by dc magnetron sputtering technique in the presence of a 400 Oe magnetic field. The FMR experiments were all done at roo
Publicado em: 2009
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5. Estudo de anisotropias de UHECR s em dados do Observatorio Pierre Auger / Study of anisotropies of cosmic rays in data from the Pierre Auger
Almost a century after the discovery of cosmic radiation, their origin, composition, acceleration and propagation mechanisms in the universe is still unknown for the ultra-high energy component ( >~ 1018 eV). The mystery grows due to the suppression (GZK cutoff) in the ux of cosmic rays with energies E >~ 6 × 10 19 eV, caused by the interaction of these par
Publicado em: 2009
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6. New functionals for the anisotropic Heisenberg model / Novos funcionais para o modelo de Heisenberg anisotrópico
The Heisenberg Model is generally recognized in the study of electromagnetism with origin in localized magnetic moments. Similar to the well known classical Ising model, it incorporates, however, quantum flutuations. We are interested in antiferromagnetic systems described by the Heisenberg Hamiltonian with exchange anisotropy and, eventually, non-null magne
Publicado em: 2008
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7. The chromo-weibel instability
I discuss the physics of non-Abelian plasmas which are locally anisotropic in momentum space. Such momentum-space anisotropies are generated by the rapid longitudinal expansion of the matter created in the first 1 fm/c of an ultrarelativistic heavy ion collision. In contrast to locally isotropic plasmas anisotropic plasmas have a spectrum of soft unstable mo
Braz. J. Phys.. Publicado em: 2007-06
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8. Supramolecular organization, spatial orientation and optical properties of extracellular proteins in corneas and aortas from diabetic spontaneous mice / Organização supramolecular, orientação espacial e propriedades opticas de proteinas extracelulares em conrneas e aortas de camundongos espontaneamente diabeticos
Diabetes mellitus is a chronic disorder of the carbohydrate, lipids and protein metabolism. A characteristic feature of this disorder is the hyperglycemia due to a deficient insulin production or to metabolic defects on its response in peripheral tissues. Hyperglycemia induces non-enzymatic glycosylation of proteins, which is responsible for advanced glycosy
Publicado em: 2007
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9. Decoherence and relaxation time in an ensemble of quantum dots / Tempos de relaxação e decoerencia em ensembles de pontos quanticos
Experimental measurements were carried out to determine the scales of the relaxation and decoherence time for the electronic spin as quantum bit. The structure of the exciton states was investigated with the objective to serve as intermediate states in the spin manipulation. The system studied for the implementation of the quantum computation is an ensemble
Publicado em: 2007
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10. CRESCIMENTO, ESTRUTURA E POLARIZAÇÃO DE TROCA EM BICAMADAS FERROMAGNETO / ANTIFERROMAGNETO PREPARADAS POR DEPOSIÇÃO EM CONDIÇÕES DE EPITAXIA POR FEIXE MOLECULAR: Fe / EuTe(111), Fe / Ni50Mn50(001) e Ni1-xFex / Fe50Mn50
Magnetic interaction at interfaces between different layered magnetic materials is an important current topic in physics and materials science, particularly when combining ferromagnetic metals and semiconductors. The exchange bias effect associated with the exchange coupling between antiferromagnetic (AFM) and ferromagnetic (FM) systems, has been extensively
Publicado em: 2007
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11. Gravitational waves: a 100-year tool applied to the dark energy problem
Recent observations from type Ia Supernovae and from cosmic microwave background (CMB) anisotropies have revealed that most of the matter of the Universe interacts in a repulsive manner, composing the so-called dark energy constituent of the Universe. Determining the properties of dark energy is one of the most important tasks of modern cosmology and this is
Brazilian Journal of Physics. Publicado em: 2005-12
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12. Anisotropias da radiação cósmica de fundo e vínculos em modelos com decaimento do vácuo
Muitas observações astronômicas feitas nos últimos anos sugerem fortemente que o universo é espacialmente plano e dominado por uma forma de energia exótica. Esta densidade de energia desconhecida acelera a expansão do universo e corresponde a cerca de 70% da densidade total de energia sendo chamada de Energia Escura ou Quintessência. Um dos candidato
Publicado em: 2005