Results 151 to 160 of about 578,037 (201)

Magnetic field gradient system for nuclear magnetic resonance microimaging

MAGMA Magnetic Resonance Materials in Physics, Biology, and Medicine, 1996
In this study we present an orthogonal magnetic field gradient system for nuclear magnetic resonance (NMR) microimaging applications. The construction details are given for a prototype assembly for proton microscopy inside a 50-mm vertical bore magnet, which is designed to fit into a commercial 300-MHz NMR probe.
E R, Andrew, B A, Inglis, M, Kempka, T, Mareci, E, Szcześniak   +4 more
openaire   +2 more sources

Exciton Motion in Large Magnetic Field Gradients

physica status solidi (a), 1997
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Piazza, F., Christianen, P.C.M., Lok, J.G.S., Maan, J.C., Vleuten, W. van der   +4 more
openaire   +2 more sources

Tailoring magnetic field gradient design to magnet cryostat geometry

2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006
Eddy currents induced within a magnetic resonance imaging (MRI) cryostat bore during pulsing of gradient coils can be applied constructively together with the gradient currents that generate them, to obtain good quality gradient uniformities within a specified imaging volume over time.
A, Trakic, F, Liu, H S, Lopez, H, Wang, S, Crozier   +4 more
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Single point measurements of magnetic field gradient waveform

Journal of Magnetic Resonance, 2003
Pulsed 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., Shea, M., Beyea, S., Shah, N., Balcom, B.   +4 more
openaire   +3 more sources

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), 2004
The 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
openaire   +1 more source

Animated gradient magnetic field topography

International Congress Series, 2004
Abstract 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, 1987
Abstract 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
openaire   +1 more source

Structured electrodeposition in magnetic gradient fields

The European Physical Journal Special Topics, 2013
Electrodeposition 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., Tschulik, K., Gebert, A., Mutschke, G., Fröhlich, J., Bund, A., Yang, X., Eckert, K.   +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, 2018
Abstract 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, Michael Böge, Michael Ehrlichman, Andreas Streun   +3 more
openaire   +1 more source

A magnetic spectrometer with gradient field

IEEE Transactions on Magnetics, 1981
The 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
openaire   +1 more source