Results 261 to 270 of about 195,278 (309)
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. +4 more
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A unilateral magnet with an extended constant magnetic field gradient
Journal of Magnetic Resonance, 2010Unilateral magnetic resonance (UMR) has become, in different research areas, a powerful tool to interrogate samples of arbitrary size. Numerous designs have been suggested in the literature to produce the desired magnetic field distributions, including designs which feature constant magnetic field gradients suitable for diffusion and profiling ...
Juan C, García-Naranjo +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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On the control of solidification using magnetic fields and magnetic field gradients
International Journal of Heat and Mass Transfer, 2005Solidification from the melt to near net shape is a commonly used manufacturing technique. The fluid flow patterns in the melt affect the quality of the final product. By controlling the flow behavior, the final solidified material can be suitably affected. Most of the magnetic field approaches to melt flow control rely on the application of a constant
Baskar Ganapathysubramanian +1 more
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Measurement of Magnetic Field Gradients
Review of Scientific Instruments, 1955A simple instrument for measuring magnetic field gradients with one-half percent accuracy is described, consisting of a small search coil vibrated at 100 cps by a loudspeaker. The application of this instrument to field gradient measurements on a magnet with hyperbolic pole pieces is described, together with some considerations on constant gradient ...
J. F. Frazer +3 more
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Measurements of Time Characteristics of the Gradient Magnetic Field
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005Imaging techniques based on the principles of nuclear magnetic resonance (NMR) are modern techniques for the study of chemical, biological and physical properties of substances. The most important are their applications in medical sciences. MR imaging of a specimen weighted with diffusion coefficients requires very accurate data on the time course of ...
Eva, Gescheidtova +2 more
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Passive screening of switched magnetic field gradients
Journal of Physics E: Scientific Instruments, 1986In NMR imaging the rapid switching of magnetic field gradients can induce currents in surrounding conductors, thus creating undesirable reflected fields which are spatially and temporally inhomogeneous. For certain types of gradient switching it is possible to screen the magnetic fields completely, using a thick cylindrical conductor, within which the ...
Turner, R., Bowley, R.
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Fields and gradients in multipolar magnets
Journal of Applied Physics, 1986This paper describes the two-dimensional field generated by an M pole electromagnet of cylindrical symmetry. By individually controlling the currents on each pole, it is possible to rotate the direction of the field around the axis of the cylinder. Gradients of any order can also be generated.
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Exciton Motion in Large Magnetic Field Gradients
physica status solidi (a), 1997Item does not contain ...
Piazza, F. +4 more
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