Results 171 to 180 of about 194,391 (210)

Exciton Motion in Large Magnetic Field Gradients

physica status solidi (a), 1997
Item does not contain ...
Piazza, F., Christianen, P.C.M., Lok, J.G.S., Maan, J.C., Vleuten, W. van der   +4 more
openaire   +2 more sources

Magnetic potential and field gradients of a model cell

Journal of Theoretical Biology, 1989
The magnetic potential within and outside a nucleated cell placed in a uniform magnetic field is described for a model consisting of two concentric diamagnetic spheres. The analytical description of the magnetic potential in and around a system consisting of a finite number of concentric diamagnetic spheres in a uniform magnetic field was derived.
G L, Mendz, B T, Bulliman, N L, James, P W, Kuchel   +3 more
openaire   +2 more sources

Concomitant magnetic field gradients and their effects on imaging at low magnetic field strengths

Magnetic Resonance Imaging, 1990
Low-field NMR imaging systems which use large amplitude field gradient pulses (e.g., in flow velocity encoding) may be subject to the undesirable effects of concomitant gradients. We demonstrate the effects of these extra gradients, which arise from Maxwell's equations, and show that the resultant image phase shifts and amplitude changes are consistent
D G, Norris, J M, Hutchison
openaire   +2 more sources

Magnetic field gradient system for nuclear magnetic resonance microimaging

MAGMA Magnetic Resonance Materials in Physics, Biology, and Medicine, 1996
In this study we present an orthogonal magnetic field gradient system for nuclear magnetic resonance (NMR) microimaging applications. The construction details are given for a prototype assembly for proton microscopy inside a 50-mm vertical bore magnet, which is designed to fit into a commercial 300-MHz NMR probe.
E R, Andrew, B A, Inglis, M, Kempka, T, Mareci, E, Szcześniak   +4 more
openaire   +2 more sources

Tailoring magnetic field gradient design to magnet cryostat geometry

2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006
Eddy currents induced within a magnetic resonance imaging (MRI) cryostat bore during pulsing of gradient coils can be applied constructively together with the gradient currents that generate them, to obtain good quality gradient uniformities within a specified imaging volume over time.
Adnan Trakic, Feng Liu 0005, Hector Sanchez Lopez, Hua Wang 0002, Stuart Crozier   +4 more
openaire   +4 more sources

Magnetization measurements using the field gradient of a high-field solenoid

Review of Scientific Instruments, 1979
By using a high-field solenoid, the force on a magnetic sample resulting from a field gradient becomes large and measurements using the Faraday (or Curie) method are greatly simplified. By using an electronic analog dividing circuit, curves of magnetic moment or susceptibility versus field or temperature can be quickly and easily recorded.
P J, Flanders, C D, Graham
openaire   +2 more sources

The Influence of Magnetic Field Gradients

1991
Abstract In conventional NMR spectroscopy the spectrum of nuclear precession frequencies gives information about the chemical environment of the spins and in order to ensure that each chemically identical nucleus has a common behaviour, it is important to arrange that the polarizing magnetic field, B0, should vary as little as ...
openaire   +1 more source

Magnetically induced electric field gradients

Hyperfine Interactions, 1986
Several investigations of the Mossbauer spectrum of Fe2As have yielded results which do not agree with those obtained by neutron diffraction studies. We report here a new investigation, and we show that the earlier disagreement is caused by a lack of appreciation of several factors.
J. M. Daniels, D. G. Rancourt, S. R. Julian   +2 more
openaire   +1 more source

Magnetic Field Gradients and Coherence-Pathway Elimination

Journal of Magnetic Resonance, Series B, 1995
The amount of residual transverse magnetization after the application of a pulsed magnetic-field gradient (PFG) is calculated for a homogeneous volume of interest (VOI) with three orthogonal pairs of sides and for VOIs that deviate from this idealized case. Many of the results can be understood in terms of the Fourier-transform relationship between the
openaire   +2 more sources

Structured electrodeposition in magnetic gradient fields

The European Physical Journal Special Topics, 2013
Electrodeposition in superimposed magnetic gradient fields is a new and promising method of structuring metal deposits while avoiding masking techniques. The magnetic properties of the ions involved, their concentrations, the electrochemical deposition parameters, and the amplitude of the applied magnetic gradient field determine the structure ...
Uhlemann, M., Tschulik, K., Gebert, A., Mutschke, G., Fröhlich, J., Bund, A., Yang, X., Eckert, K.   +7 more
openaire   +2 more sources