Results 221 to 230 of about 411,672 (266)

NMR Images Produced in a Substantially Non‐Uniform Field

Australasian Radiology, 1985
SUMMARYNMR images of distinct sections through a three‐dimensional phantom were obtained using steady magnetic fields much less uniform than those generally considered necessary for NMR imaging, but whose substantial gradient served to define the slices to be imaged.
M, Braun, A L, McCarthy
openaire   +2 more sources

Effects of Non-Uniform Crosswind Fields on Scintillometry Measurements

Boundary-Layer Meteorology, 2011
The effects of a non-uniform wind field along the path of a scintillometer are investigated. Theoretical spectra are calculated for a range of scenarios where the crosswind varies in space or time and compared to the ‘ideal’ spectrum based on a constant uniform crosswind.
Ward, H.C., Evans, J.G., Grimmond, C.S.B.   +2 more
openaire   +3 more sources

The implications of non-uniformity in fields-of-view of commonly used field spectroradiometers

2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
Accurately determining the field-of-view (FOV) is a basic requirement in photogrammetry and imaging spectroscopy but has rarely been considered in detail in field spectroscopy where the specifications for different spectroradiometers generally lack clarity or detail.
Alasdair A. MacArthur, Christopher J. MacLellan, Timothy J. Malthus   +2 more
openaire   +1 more source

Magnetic resonance imaging with non-uniform fields

Physics in Medicine and Biology, 1986
Various methods have been used to recover NMR images with non-uniform magnetic fields. The authors describe a new method which recovers the image, and an exact solution for the spatially dependent magnetic inhomogeneities from data obtained from commonly used direct Fourier transform pulse-gradient sequences, at a negligible cost of extra computation.
E Feig, F Greenleaf, M Perlin
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Droplet Dynamics in a Non-uniform Flow Field

Combustion Science and Technology, 1991
Abstract The present paper describes research to determine the lift and drag forces on a single heptane droplet in a non-uniform flow field over a range of Reynolds numbers of 1-30. Experiments are described for droplels (90-320μm) entering a jet of air (≈ 1 m/s) and fallowing unsteady curvilinear trajectories (for which few experimental studies and no
G. T. LINTERIS, P. A. LIBBY, F. A. WILLIAMS   +2 more
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Non-uniform Optical Near-Field

2020
The optical near-field (ONF) is an electric field, which is localized at nanoscale materials.
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Electron transport in a non-uniform magnetic field

Journal of Physics: Condensed Matter, 1995
We have used MBE regrowth technology to produce a non-planar 2DEG at a GaAs/AlGaAs heterojunction grown over an etched facet. By applying a uniform magnetic field to this structure we obtain a spatially varying field component normal to the 2DEG. When the magnetic field is applied in the plane of the substrate, the resistance measured from one side of ...
M L Leadbeater, L C Foden, T M Burke, J H Burroughes, M P Grimshaw, D A Ritchie, L L Wang, M Pepper   +7 more
openaire   +1 more source

Effect of non-uniform temperature field in viscosity measurement

Journal of Visualization, 2015
In viscosity measurement, temperature control is very important. In this research, the effects of temperature distribution in viscosity measurement are investigated. Vibrational viscometers are preferred in experiments over other types of viscometers due to their low cost, easy to use and effective continuous viscosity measurement capability.
openaire   +3 more sources

Bubble growth in non-uniform temperature fields

Chemical Engineering Science, 1971
Abstract A previous theoretical model for bubble growth in superheated liquids has been extended to non-uniform temperature fields. The growth rate has been assumed as controlled by heat transfer, surface tension, liquid inertia and non-equilibrium at the liquid—vapor interface.
L. Biasi, P. Stipari, A. Tozzi
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Criterion for spark-breakdown in non-uniform fields

Journal of Applied Physics, 2014
We develop a criterion for spark-breakdown in non-uniform field geometries with positive polarity and small electrode separations so that breakdown evolves without the formation of a leader. We arrive at the spark-breakdown criterion by framing it in terms of gain and instability conditions, whose relative importance is established from an analysis of ...
L. K. Warne, R. E. Jorgenson, E. E. Kunhardt   +2 more
openaire   +1 more source