Results 281 to 290 of about 67,800 (314)
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Magnetic field interactions in adjustable hydrocephalus shunts
Journal of Neurosurgery: Pediatrics, 2008Object Exposing patients with ventricular shunts to magnetic fields and MR imaging procedures poses a significant risk of unintentional changes in shunt settings. Shunt valves can also generate considerable imaging artifacts. The purpose of this study was to determine the magnetic field safety and MR imaging compatibility of 5 adjustable models of ...
Andrea Lavinio +7 more
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Arrays of resistively shunted Josephson junctions in magnetic fields
Physical Review B, 1993A two-dimensional array of resistively shunted Josephson junctions in the presence of both applied external currents and transverse magnetic fields is studied both analytically and numerically. The dynamics of the system is specified by a set of Langevin equations, and leads to a stationary state, which can be described by an effective Hamiltonian. The
, Kim, , Choi
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Magnetically programmable shunt valve: MRI at 3-Tesla
Magnetic Resonance Imaging, 2007A magnetically programmable cerebrospinal fluid (CSF) shunt valve (Codman Hakim Programmable Valve, Codman, a Johnson & Johnson Company, Raynham, MA) was assessed for magnetic field interactions, heating, artifacts and functional changes at 3-Tesla. The programmable valve showed minor magnetic field interactions and heating (+0.4 degrees C).
Frank G, Shellock +2 more
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An In Vitro Study of Magnetic Field Interference with an Electronic Shunt Programmer
World Neurosurgery, 2022Programmable shunts play a valuable role in the treatment of hydrocephalus. However, the use of magnets in programming these valves has caused obstacles in today's magnetized world. Previous studies have reported problems with magnetic toys and electronics unintentionally reprogramming shunt valves.
Hengameh B. Pajer +3 more
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Magnetic Resonance Angiography as a Technique for the Visualization of Hemodialysis Shunts
Nephron, 1996In order to test the suitability of magnetic resonance angiography for the visualization of Brescia-Cimino hemodialysis shunts, 20 patients (8 women, 12 men, aged 24-69 years) were examined with this technique. The shunt arm was placed in an extremity coil. The time-of-flight method was applied. Examination time was less than 15 min.
M, Konermann +5 more
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Evaluation of intracardiac shunts with cardiac magnetic resonance
Current Cardiology Reports, 2005Intracardiac shunts including atrial septal defect, ventricular septal defect, endocardial cushion defects, and surgical baffles may be identified, localized, and quantified using cardiac MRI methods. Both dark-blood and bright-blood techniques are helpful to identify anatomy.
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The edge effects of magnetic shunts for a transformer tank
2011 International Conference on Electrical Machines and Systems, 2011Base on 3D finite element method a 3D electromagnetic model for a three-phase three-limb power transformer is given and analyzed. Such a model can give not only the correct load losses in windings, but also the satisfied stray losses with measured in the transformer tank. Influences of magnetic shunts on tank losses are discussed.
Zhanhai Song +6 more
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A Power Rating and Application Survey of Magnetically Controlled Shunt Reactor
2016 European Modelling Symposium (EMS), 2016MCSR can simplify the system reactive power and voltage control in the super / special high-voltage power grid, suppress power frequency and operation over voltage, eliminating generator self excitation, dynamically compensate charging the power in a transmission line, suppress the secondary arc current, damping system resonance and so on, which can ...
Mehmet Tümay +5 more
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On the Role of Magnetic Shunts for Increasing Performance of Transverse Flux Machines
IEEE Transactions on Magnetics, 2017This paper presents work completed in order to investigate the importance of magnetic shunts in transverse flux machines. Two types of transverse flux machines with different configurations were designed and tested in the laboratory. The first type of machine is a transverse flux generator with inner rotor. This machine was designed according to one of
Oleksandr Dobzhanskyi +2 more
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Stray Losses in the Step of a Transformer Yoke with a Horizonatal Magnetic Shunt
IEEE Power Engineering Review, 1982The distribution of stray losses in the step of a laminated transformer yoke with a horizontal magnetic shunt is solved using a network approach. Total losses, maximum loss density, and leakage flux return along the yoke all vary with gap spacings between shunt and yoke.
M. Djurovic, J. Monson
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