Magnetic And Longitudinal Field
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. NMR Relaxometry Applied to Chemical Studies of Paramagnetic Metal Cation Complexes: Fundamentals and Applications
Low field time-domain nuclear magnetic resonance (TD-NMR) relaxometry of paramagnetic metal cations (PMC) has been widely used to study and improve contrast agents for magnetic resonance imaging (MRI). However, despite its remarkable potential, TD-NMR is rarely used to study PMC complexes, and coordination compounds in non-biomedical application. Therefore,
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Structural and functional neuroimaging studies in generalized anxiety disorder: a systematic review
Objectives: Brain imaging studies carried out in patients suffering from generalized anxiety disorder (GAD) have contributed to better characterize the pathophysiological mechanisms underlying this disorder. The present study reviews the available functional and structural brain imaging evidence on GAD, and suggests further strategies for investigations in
Braz. J. Psychiatry. Publicado em: 16/05/2019
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3. The link between cardiovascular risk, Alzheimer's disease, and mild cognitive impairment: support from recent functional neuroimaging studies
Objective: To review functional neuroimaging studies about the relationship between cardiovascular risk factors (CVRFs), Alzheimer's disease (AD), and mild cognitive impairment (MCI). Methods: We performed a comprehensive literature search to identify articles in the neuroimaging field addressing CVRF in AD and MCI. We included studies that used positron em
Rev. Bras. Psiquiatr.. Publicado em: 10/06/2014
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4. Desenvolvimento de sistemas eletroquímicos acoplados a RMN de baixo e alto campo para análises in situ / Development of the electrochemical systms coupled to the low and high-field NMR for in situ analysis
Neste trabalho é descrito o desenvolvimento de sistemas eletroquímicos (EQ) acoplados com a RMN de baixo e alto campo para análises in situ. Para a análise EQ-RMN de baixo campo, foi construído um sistema eletroquímico para ser utilizado tanto em um espectrômetro RMN-DT (B0= 0,23 T) quanto em um sensor unilateral (B0= 0,4 T). A platina foi utilizada c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2012
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5. Effect of warm ionized plasma medium on radiation properties of four elements microstrip antenna array printed on ferrite substrate
This paper describes theoretically the radiation properties of four element microstrip antenna array printed upon a typical ferrite substrate Ni1.062Co0.o2Fe1.948O4 in the presence of normal dc magnetic bias field. In loss-less isotropic warm plasma, this array antenna geometry excites both electromagnetic (EM) and electroacoustic plasma (P) waves in additio
Brazilian Journal of Physics. Publicado em: 2010-03
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6. Comparação entre resultados numéricos e experimentais para o campo magnético de cubas eletrolíticas de alumínio = Numerical and experimental results comparison of magnetic fields in aluminium eletrolysis cells / Numerical and experimental results comparison of magnetic fields in aluminium eletrolysis cells
A fabricação primária de alumínio dá-se em fornos onde banho e metal líquidos são movimentados a partir de Forças de Lorentz. Esse artigo apresenta a validação experimental em cubas reais de uma metodologia 3-D de análise eletromagnética de cubas eletrolíticas anteriormente desenvolvida com o pacote comercial de Elementos Finitos ANSYS 9.0. Os r
Publicado em: 2010
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7. The spin-1/2 ising model with skew magnetic field at high temperatures
We calculate the thermodynamics of the one-dimensional spin-1/2 Ising model in the presence of a constant skew magnetic field. We obtain the high-temperature expansion of its Helmholtz free energy (HFE), for the ferromagnetic and antiferromagnetic cases, up to order beta7. This expansion permits us to obtain the behaviour of the model for $ |J| \beta \stackr
Brazilian Journal of Physics. Publicado em: 2008-03
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8. MAGNETOIMPEDÂNCIA COMO FERRAMENTA PARA A CARACTERIZAÇÃO MAGNÉTICA DE MICROFIOS AMORFOS / MAGNETOIMPEDANCE AS A TOOL TO INVESTIGATE THE MAGNETIC PROPERTIES OF MICROWIRES
The possibility of exploring the magnetic properties of amorphous microwires in technological applications has attracted the attention of the scientific community in the last years. Beyond, the magnetoimpedance effect has been established as a powerful tool to study these properties. In this work we show a study of the magnetic properties of Joule heated gla
Publicado em: 2006
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9. Longitudinal magnetic field effect on the electrical breakdown in low pressure gases
The electrical breakdown has been investigated for low-pressure argon and nitrogen discharges under the influence of an external longitudinal magnetic field. Plane-parallel aluminum electrodes (5 cm diameter) separated by a variable distance d (4.0 cm < d < 11.0 cm) were sustained with a dc voltage (0 < V < 1 kV). A Helmholtz coil was used to produce an unif
Brazilian Journal of Physics. Publicado em: 2004-12
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10. The sinusoid as the longitudinal profile in backward-wave oscillators of large cross sectional area
High-power generation in backward-wave oscillators (BWO) of large section requires that the beam electrons flowing close to the corrugated wall interact efficiently with surface waves supported by a periodic structure. Such waves are described by the superposition of slow-wave space harmonics of the operating mode. The present paper reports on design tools f
Brazilian Journal of Physics. Publicado em: 2004-12
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11. Double-helix current drive revisited
The conditions required for efficient current drive in a weakly resistive plasma column, subject to a double helix traveling magnetic field, are examined in detail by using a simple non-linear Ohm's law for the plasma. In agreement with previous numerical work on the subject by Bertram [5], it is shown that field penetration is indeed strongly limited when l
Brazilian Journal of Physics. Publicado em: 2003-12
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12. "Estados quânticos de um elétron em um campo magnético uniforme" / Quantum States of an Eletcron in a Uniform Magnetic Field
Neste trabalho, apresentamos um método que permite explicitar a arbitrariedade contida nas soluções das equações de onda relativísticas, na presença de certos tipos de campos eletromagnéticos externos. Esta arbitrariedade está relacionada com a existência de uma transformação, com a qual podemos reduzir o número de variáveis presentes na equaç
Publicado em: 2002