Electronic Spin Resonance
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Arterial spin labeling in patients with schizophrenia: a systematic review
Abstract Background: Neuroimaging studies are an invaluable source of information about the physiopathology of schizophrenia. Arterial spin labeling (ASL) is a new magnetic resonance technique (MRI) that is able to effectively evaluate brain function without the use of radiation. Objective: To make a systematic review of studies using ASL to compare restin
Arch. Clin. Psychiatry (São Paulo). Publicado em: 2016-12
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2. Ni(II), Cu(II), AND Zn(II) COMPLEXES DERIVED FROM A NEW SCHIFF BASE 2-((Z)-(3-METHYLPYRIDIN-2- YLEIMINO)METHYL)PHENOL AND SYNTHESIS OF NANO SIZED METAL OXIDE PARTICLES FROM THESE COMPOUNDS
Synthesis, spectral identification, and magnetic properties of three complexes of Ni(II), Cu(II), and Zn(II) are described. All three compounds have the general formula [M(L)2(H2O)2], where L = deprotonated phenol in the Schiff base 2-((z)-(3-methylpyridin-2-yleimino)methyl)phenol. The three complexes were synthesized in a one-step synthesis and characterize
Quím. Nova. Publicado em: 2015-11
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3. Estudos da dinâmica estrutural da proteína ligante de cálcio S100A12 humana e da lisozima T4 / Structural dynamics studies of human calcium binding protein S100A12 and T4 lysozyme
The work presented here was conceived with two main objectives. The first one, more general, involved the implementation of a new methodology for the study of conformational changes in proteins, i.e., its structural dynamics. The technique of Site-directed Spin Labeling combined with Electronic Paramagnetic Resonance (SDSL-EPR) are the pillars of this new me
Publicado em: 2011
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4. Determinação e análise da influência angular e eletrônica nas constantes de acoplamento nJCH em 2-X-4-t-butilcicloexanonas e 2-X-4-t-butilcicloexanóis (X=H, Me, F, Cl, Br) / Determination of NMR nJCH spin-spin coupling constants and analysis of their angular and electronic dependence in 2-X-4-t-butylcycloexanonas and 2-X-4-t-butylcycloexanols (X=H, Me, F, Cl, Br)
A dissertação consiste de uma parte introdutória que versa sobre constantes de acoplamento JXH que seguem ou não uma relação de estrita dependência com o ângulo diedro, proposta por Karplus para JHH e por Aydin e Günther para JCH; apresentando como as interações hiperconjugativas afetam os valores das mesmas. Seguindo a estrutura da dissertação
Publicado em: 2011
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5. Adapatação de métodos de estrutura eletrônica em cálculos de propriedades de ressonância magnética nuclear e barreiras de rotação interna / Adaptation of electronic structure methods in calculations of nuclear magnetic resonance properties and internal rotation barriers
A avaliação de funcionais de densidade no cálculo de constante de acoplamento spi-spin, mostrou que o funcional híbrido meio a meio BHandH apresenta precisão similar aos métodos ab initio, como SOPPA(CCSD) e LR-CCSD. A variação E nos funcionais testados melhorou a precisão das constantes de acoplamento spin-spin para a maioria dos casos, sendo que a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/10/2010
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6. 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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7. Sistemas para manipulação quantica em estado solido / Towards an implementation of quantum manipulation in solid states
This thesis proposes and implements a system for quantum information processing, focusing primarily on the associated instrumentation. The basic physical aspects for computation, such as the associated energy and Shannon s entropy, were revisited. InAs:GaAs quantum dots were elected as the physical system of choice for this implementation; in particular, the
Publicado em: 2008
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8. 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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9. Polimetalates porphyrins with ruthenium phosphinics complex to application in homogeny catalyze, Non Linear Optic and Langmuir-Blodgett film preparation / Porfirinas polimetaladas com complexos periféricos de rutênio com aplicações em catálise homogênea, óptica não linear e montagem de filmes de Langmuir-Blodgett
A novel metaloporphyrin with ruthenium complexes, {H2-TPyP[RuCl(dppb)(Xbipy)] 4}(PF6)4 and {M-TPyP[RuCl(dppb)(X-bipy)]4}(PF6)4, (where M = Mn(III), Co(II) and Zn(II), X = Me- MeO- and Cl-) has been synthesized and structurally characterized by 31P{1H} magnetic resonance, UV-Vis and IR spectroscopy, cyclic voltammetry and CHN. The catalytic activity of {Mn-TP
Publicado em: 2007
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10. Desenvolvimento de processos de deposição de filmes filmes sobre substratos polimericos fotopolimerizdos / Development of process of deposition of thin films on photopolymerization polymeric substrats
A new era has begun all around the world. The quality of life and health depends more and more on the human capacity of resolving problems that are becoming longer and more complex day by day. As communication and globalization advance, time becomes scarcer and more precious. The semiconductor materials which are used to activate the logical functions, the h
Publicado em: 2007
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11. Studies of the magnetic properties on Mn-doped GaAs and Zn1-xCoxO thin films / Estudos das propriedades magneticas dos filmes finos de GaAs diopado com Mn e de Zn1-xCoxO
Ferromagnetic semiconductors (FM) are compounds of technological interest due to the possibility of combining their charge and spin degrees of freedom when producing electronic devices. In particular, semiconductor thin films doped with transition metal have become focus of intense scientific investigation since ferromagnetism with reasonably high Curie temp
Publicado em: 2007
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12. Contribution of the spin current to the damping of the magnetic moment precession of Fe impurities in Pd
We investigate the spin dynamics of a magnetic adatom on a non-magnetic surface with strong Stoner enhancement. We find a strong damping of the adatom's magnetization precession and a large shift of the resonance frequency from its bare value. Stoner enhancement in the substrate reduces the damping. We explore the damping dependence on features of the electr
Brazilian Journal of Physics. Publicado em: 2006-09