Results 171 to 180 of about 372,553 (214)
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Magnetic Resonance in Medicine, 1988
AbstractHomogeneous radiofrequency magnetic fields are necessary for production of high‐quality magnetic images and for most forms of magnetic resonance spectroscopy. It is often convenient to map the radiofrequency homogeneity associated with a resonant device by measuring the magnetic image intensity of an aqueous phantom placed within the resonator.
J P, Hornak, J, Szumowski, R G, Bryant
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AbstractHomogeneous radiofrequency magnetic fields are necessary for production of high‐quality magnetic images and for most forms of magnetic resonance spectroscopy. It is often convenient to map the radiofrequency homogeneity associated with a resonant device by measuring the magnetic image intensity of an aqueous phantom placed within the resonator.
J P, Hornak, J, Szumowski, R G, Bryant
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Physica B: Condensed Matter, 1995
Abstract After a summary of the observations of cosmic magnetic fields, I briefly discuss the status of dynamos, the use of electric circuits, the physics of magnetic explosions, the role of magnetic tension and our strongest magnet known, the radio pulsar. Finally I mention a few problem areas which may show a breakthrough in the near future.
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Abstract After a summary of the observations of cosmic magnetic fields, I briefly discuss the status of dynamos, the use of electric circuits, the physics of magnetic explosions, the role of magnetic tension and our strongest magnet known, the radio pulsar. Finally I mention a few problem areas which may show a breakthrough in the near future.
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Physical Review E, 2012
A vertically draining thin ferrofilm under the influence of gravity and a nonuniform magnetic field is considered. It is observed experimentally that the presence of the magnetic field greatly alters the drainage of the film. A mathematical model is developed to describe the behavior. Experiments are conducted for multiple magnetic field configurations.
Randy, Back, J Regan, Beckham
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A vertically draining thin ferrofilm under the influence of gravity and a nonuniform magnetic field is considered. It is observed experimentally that the presence of the magnetic field greatly alters the drainage of the film. A mathematical model is developed to describe the behavior. Experiments are conducted for multiple magnetic field configurations.
Randy, Back, J Regan, Beckham
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Fusion Technology, 1998
Plasmas and magnetic fields are inseparably related in numerous physical circumstances. This is not only the case in natural occurring plasmas like the solar corona and the earth magnetic tail, but also in laboratory plasmas like tokamaks and stellarators.
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Plasmas and magnetic fields are inseparably related in numerous physical circumstances. This is not only the case in natural occurring plasmas like the solar corona and the earth magnetic tail, but also in laboratory plasmas like tokamaks and stellarators.
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Soviet Physics Uspekhi, 1960
Investigations and published data on strong magnetic fields and their applications are reviewed. Various means for creating strong magnetic fields with iron-core electromagn ets, with non-ferrous constant electromagnets, and the means for producing and measuring pulsed magnetic fields are discussed. 127 references. (R.V.J.)
G.M. Strakhovskii, N.V. Kravtsov
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Investigations and published data on strong magnetic fields and their applications are reviewed. Various means for creating strong magnetic fields with iron-core electromagn ets, with non-ferrous constant electromagnets, and the means for producing and measuring pulsed magnetic fields are discussed. 127 references. (R.V.J.)
G.M. Strakhovskii, N.V. Kravtsov
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Magnetic Fields and Miscarriage
Epidemiology, 2002Is there a link between exposure to magnetic fields and the risk of miscarriage? Past epidemiologic stud? ies have been few and inconsistent,1,2 but with the publication in this issue of results from two large and sophisticated studies in Northern California,3,4 the ques? tion takes on a new level of interest.
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Journal of the Franklin Institute, 1974
The observed properties of solar magnetic fields are reviewed, with particular reference to the complexities imposed on the field by motions of the highly conducting gas. Turbulent interactions between gas and field lead to heating or cooling of the gas according to whether the field energy density is less or greater than the maximum kinetic energy ...
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The observed properties of solar magnetic fields are reviewed, with particular reference to the complexities imposed on the field by motions of the highly conducting gas. Turbulent interactions between gas and field lead to heating or cooling of the gas according to whether the field energy density is less or greater than the maximum kinetic energy ...
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Magnets and Magnetic Field Measurements
Science, 1955A L, Bloom, M E, Packard
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2018
Classically, a point charge that circulates on a ring of radius r produces a current \(i = \frac{ev}{2 \pi r}\), which causes a magnetic dipole moment \(\overrightarrow{\mu }= \frac{i}{c} S \overrightarrow{n}\), \(S= \pi r^{2}\), in obvious notation; \(\overrightarrow{\mu }= \frac{e v}{2c} r \overrightarrow{n}= \frac{e}{2c} \overrightarrow{r} \wedge ...
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Classically, a point charge that circulates on a ring of radius r produces a current \(i = \frac{ev}{2 \pi r}\), which causes a magnetic dipole moment \(\overrightarrow{\mu }= \frac{i}{c} S \overrightarrow{n}\), \(S= \pi r^{2}\), in obvious notation; \(\overrightarrow{\mu }= \frac{e v}{2c} r \overrightarrow{n}= \frac{e}{2c} \overrightarrow{r} \wedge ...
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