Results 241 to 250 of about 2,685,592 (310)

Magnetic Resonance Imaging and Cerebrospinal Fluid Shunt Valves

New England Journal of Medicine, 2005
To the Editor: In about 80 percent of all cases of hydrocephalus, the accumulation of cerebrospinal fluid is treated with shunt valves.1 Over the past 30 years, magnetically adjustable valves have become widely accepted and routinely implanted devices. In central and northern Europe, adjustable valves are routinely implanted for about 40 percent of all
Michael, Akbar, Christoph, Stippich, Alfred, Aschoff   +2 more
openaire   +2 more sources

Dual-range TMR current sensor based on magnetic shunt/aggregation effects utilizing single magnetic ring structure

Measurement science and technology
In this paper, we propose and design a novel dual-range tunnel magnetoresistance (TMR) current sensor with a single magnetic ring structure. This design incorporates two distinct magnetic guiding effects, namely magnetic shunt and magnetic aggregation ...
Ru Bai, Boyan Li, Jiakun Tu, Tengda Yang, Aiyu Dou, Yucheng Sun, Zhenghong Qian   +6 more
semanticscholar   +1 more source

Study on Temperature-Insensitive Permanent Magnet Eddy Current Retarder Using Magnetic Shunt Compensation Method

IEEE transactions on magnetics
In this article, a novel permanent magnet eddy current retarder (PMECR), with a characteristic of temperature-insensitive damping torque over a wide range of operating temperatures, is proposed for speed limit systems.
Hongyu Wu, He Yan, Yujie Dong, Xingzhong Diao   +3 more
semanticscholar   +1 more source

Magnetic Resonance Imaging of Arterioportal Shunts in the Liver

Topics in Magnetic Resonance Imaging, 2002
Localized perfusional variations are being seen more frequently in magnetic resonance imaging (MRI) as the increased reliance of the optimized arterial-phase contrast-enhanced strategies has become more commonplace. Many of these findings are related to the various organic or functional arterioportal shunts in the liver.
Jeong-Sik, Yu, Neil M, Rofsky
openaire   +2 more sources

Shunt protection for superconducting Maglev Magnets

Cryogenics, 1979
Abstract Closely coupled, short-circuited shunt coils are proposed for quench protection of super-conducting Maglev magnets which use high resistance, matrix composite conductors. It is shown that, by suitable design, the shunts can reduce ac losses and that the changing currents during magnet energization or vehicle lift off and landing can be ...
openaire   +1 more source

Arrays of resistively shunted Josephson junctions in magnetic fields

Physical Review B, 1993
A 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
openaire   +2 more sources

Dynamic telephone receiver with magnetic shunt

The Journal of the Acoustical Society of America, 1989
A dynamic telephone receiver which is capable of being used in association with hearing aids, has a flux coil positioned around the pole piece and magnet assembly. To minimize the strong magnetic leakage field radiated from the air gap, which can attract pins, paper clips and other ferrous metals a shunt can be provided at the face of the receiver ...
openaire   +1 more source

Magnetic resonance angiography of dialysis access shunts: Initial results

Magnetic Resonance Imaging, 1996
The objective of this study was the feasibility of imaging hemodialysis fistulae with magnetic resonance angiography (MRA). MRA was performed in eight Brescia-Cimino fistulae and seven goretex loop grafts, five of which were stenosed and 10 normal. We compared two MRA methods: a 2D magnetization prepared turbo field echo (MPTFE) and a 3D phase contrast
G J, Waldman, P M, Pattynama, P C, Chang, C, Verburgh, J H, Reiber, A, de Roos   +5 more
openaire   +2 more sources

Tunable electromagnetic shunt damper with opposing magnets configuration

Smart Materials and Structures, 2020
Abstract Electromagnetic damper (EMD) has been widely studied in the control of vibrating structures. It has higher tunability when compared with a viscous damper and lower cost when compared with a magnetorheological damper. However, its use is limited mainly due to the high ratios of system mass/volume to the damping force produced. In
Ruqi Sun, Waion Wong, Li Cheng
openaire   +2 more sources

Shunt-coupled magnetic-amplifier circuits

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1959
A recent study of magnetic-amplifier theory based on block-diagram techniques1 suggested to this author that one potentially useful basic technique for extracting the output information from the simple self-saturating magnetic amplifier had been seriously neglected in the past. Although it is a well-recognized fact that the output information in a self-
openaire   +1 more source