نتایج جستجو برای: static magnetic field

تعداد نتایج: 1138655  

2012
M. Boyvat C. Hafner

In this paper, it is demonstrated how anisotropic and inhomogeneous magnetic metamaterials may be used for molding the flow of the magnetic field, considering magnetic field shielding as the main application of practical interest. It is shown that using anisotropic materials, magnetic field shielding may be improved, and this anisotropy can be realized by metamaterials. Introducing additional i...

Journal: :Bioelectromagnetics 2010
Carlos F Martino Lucas Portelli Kevin McCabe Mark Hernandez Frank Barnes

Small alterations in static magnetic fields have been shown to affect certain chemical reaction rates ex vivo. In this manuscript, we present data demonstrating that similar small changes in static magnetic fields between individual cell culture incubators results in significantly altered cell cycle rates for multiple cancer-derived cell lines. This change as assessed by cell number is not a re...

Journal: :Bioelectromagnetics 1999
S Milham J B Hatfield R Tell

Magnetic fields emanate from radial tires due to the presence of reinforcing belts which are made of magnetized steel wire. When these tires spin, they generate alternating magnetic fields of extremely low frequency (ELF), usually below 20 Hz. The fundamental frequency of these fields is determined by tire rotation rate and has a sinusoidal waveform with a high harmonic content. The static fiel...

Journal: :The Review of scientific instruments 2009
G Boero S Rusponi J Kavich A Lodi Rizzini C Piamonteze F Nolting C Tieg J-U Thiele P Gambardella

We describe a setup for the x-ray detection of ferromagnetic resonance in the longitudinal geometry using element-specific transmission measurements. Thin magnetic film samples are placed in a static magnetic field collinear with the propagation direction of a polarized soft x-ray beam and driven to ferromagnetic resonance by a continuous wave microwave magnetic field perpendicular to it. The t...

2003

In chapter IV, we used quantum mechanics to study the evolution of a spin 1/2 in a static magnetic field. In this complement, we shall consider the case of a spin 1/2 simultaneously subjected to several magnetic fields, some of which can be time dependent, as is the case in magnetic resonance experiments. Before attacking this problem quantum mechanically, we shall briefly review several result...

Journal: :Bioelectromagnetics 2010
Carlos F Martino Héctor Perea Ursula Hopfner Virginia L Ferguson Erich Wintermantel

Pulsed electromagnetic fields (PEMFs) have been used extensively in bone fracture repairs and wound healing. It is accepted that the induced electric field is the dose metric. The mechanisms of interaction between weak magnetic fields and biological systems present more ambiguity than that of PEMFs since weak electric currents induced by PEMFs are believed to mediate the healing process, which ...

Journal: :journal of physical & theoretical chemistry 2014
f. soheilian m.r. soltani m. firoozi s. a. hosseini

the entanglement at zero-temperature is studied in a two-qubit xz spin-1/2 chain model in anexternal magnetic field which is applied in the z direction. we have obtained an analytical relation forthe effect of the external magnetic field on the concurrence. it is shown that the ground state of thesystem depends on the strength of exchange coupling. we have shown that the analytical relation oft...

2002
Óscar J. C. Dias José P. S. Lemos

We obtain the magnetic counterpart of the BTZ solution, i.e., the rotating spacetime of a point source generating a magnetic field in three dimensional Einstein gravity with a negative cosmological constant. The static (non-rotating) magnetic solution was found by Clément, by Hirschmann and Welch and by Cataldo and Salgado. This paper is an extension of their work in order to include (i) angula...

2007
Philip Chadwick

This report describes the results of an investigation of operator exposure to static and switched­gradient fields from magnetic resonance imaging (MRI) systems. The project involves both computational modelling and the measurement of personal exposure using dedicated magnetic field dosemeters. The work was undertaken by Professor Stuart Crozier of the University of Queensland acting as an MCL c...

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