Results 161 to 170 of about 194,391 (210)

An improved approach to calibrating high magnetic field gradients for pulsed field gradient experiments

Journal of Magnetic Resonance, 2008
Probes capable of generating short high intensity pulsed magnetic field gradients are commonly used in diffusion studies of systems with very short T(2). Traditional methods of calibrating magnetic field gradients present unique challenges at ultrahigh field strengths and are often inapplicable.
Yadav, Nirbhay N. (S24980), Torres, Allan M. (R11665), Price, William S. (R10381)   +2 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
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A unilateral magnet with an extended constant magnetic field gradient

Journal of Magnetic Resonance, 2010
Unilateral 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, Igor V, Mastikhin, Bruce G, Colpitts, Bruce J, Balcom   +3 more
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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
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On magnetic field gradients in sunspots

Chinese Astronomy, 1980
Abstract 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, null Wang Zhen-yi, null Jin Jie-hai   +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, 2005
Solidification 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, Nicholas Zabaras   +1 more
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Measurement of Magnetic Field Gradients

Review of Scientific Instruments, 1955
A 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, J. A. Hofmann, M. S. Livingston, A. M. Vash   +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, 2005
Imaging 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, Radek, Kubasek, Karel, Bartusek   +2 more
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Passive screening of switched magnetic field gradients

Journal of Physics E: Scientific Instruments, 1986
In 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, 1986
This 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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