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Single point measurements of magnetic field gradient waveform
Journal of Magnetic Resonance, 2003Pulsed magnetic field gradients are fundamental to spatial encoding and diffusion weighting in magnetic resonance. The ideal pulsed magnetic field gradient should have negligible rise and fall times, however, there are physical limits to how fast the magnetic field gradient may change with time. Finite gradient switching times, and transient, secondary,
Goodyear, D. +4 more
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Magnetic resonance technique of gradient magnetic field measurement
Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE Cat. No.03CH37439), 2004The paper describes the instantaneous frequency of spin echo (IFSE) and instantaneous frequency of spin echoes series (IFSES) methods for the measurement of the gradient magnetic field time and spatial characteristics in MR systems. A comparison of the two described methods is presented as well as the time characteristics of gradients time decays. From
K. Bartusek, E. Gescheidtova, J. Vesely
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Animated gradient magnetic field topography
International Congress Series, 2004Abstract It is difficult to comprehend extents and dynamic changes of biomagnetic brain activities from electrically equivalent current dipole (ECD) estimation. The author proposed animated gradient magnetic field topography to solve this. Neuromag System with 102 orthogonal paired planar type gradiometers was used. Measured data at 102 sensor points
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Magnetic field gradient effects on magnetic fluid stabilization
Journal of Magnetism and Magnetic Materials, 1987Abstract The penetrating finger instability which develops when a less viscous fluid pushes a more viscous fluid can be stabilized through the use of a magnetizable fluid in the presence of a magnetic field tangential to the interface. A uniform magnetic field only stabilizes suitably short waves travelling along the field lines.
Markus Zahn, R.E. Rosensweig
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Structured electrodeposition in magnetic gradient fields
The European Physical Journal Special Topics, 2013Electrodeposition in superimposed magnetic gradient fields is a new and promising method of structuring metal deposits while avoiding masking techniques. The magnetic properties of the ions involved, their concentrations, the electrochemical deposition parameters, and the amplitude of the applied magnetic gradient field determine the structure ...
Uhlemann, M. +7 more
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Magnetic field of longitudinal gradient bend
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018Abstract The longitudinal gradient bend is an effective method for reducing the natural emittance in light sources. It is, however, not a common element. We have analyzed its magnetic field and derived a set of formulae. Based on the derivation, we discuss how to model the longitudinal gradient bend in accelerator codes that are used for designing ...
Masamitsu Aiba +3 more
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A magnetic spectrometer with gradient field
IEEE Transactions on Magnetics, 1981The main features are described of a spectrometer which is being assembled for nuclear research in Oxford. It is unusual in that the main 100° analysing magnet whilst of 'picture frame' form also provides a wide aperture of gradient field. Advantages are a larger dispersion for a given overall size and bending radius, with the possibility of a normal ...
J. Coupland, T. Randle, M. Watson
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On magnetic field gradients in sunspots
Chinese Astronomy, 1980Abstract This paper is devoted mainly to a method of determining the gradient of magnetic fields. Utilizing the numerical solution of the equations of transfer of the Stokes parameters, we have calculated quantities characterizing the asymmetry and the amount of rotation of the wings of the “o” and “e” profiles of the magnetically sensitive line Fe ...
null Ye Shi-hui +2 more
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Magnetic Field Gradients and Coherence-Pathway Elimination
Journal of Magnetic Resonance, Series B, 1995The amount of residual transverse magnetization after the application of a pulsed magnetic-field gradient (PFG) is calculated for a homogeneous volume of interest (VOI) with three orthogonal pairs of sides and for VOIs that deviate from this idealized case. Many of the results can be understood in terms of the Fourier-transform relationship between the
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Particles incident on magnetic field gradients
Journal of Geophysical Research, 1968Trajectory and penetration of single charged particle coming from field free region to boundary of idealized two dimensional magnetic ...
T. E. Stevenson, C. Comstock
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