Results 141 to 150 of about 2,119,792 (195)
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Hanging Around in Non-Uniform Fields
The American Mathematical Monthly, 2015AbstractWe define a family of curves, the n-catenaries, parameterized by the nonzero reals. They include the classical catenaries (n = 1), parabolas (n = 1/2), cycloids (n = −1/2), and semicircles ...
null Fred Kuczmarski +1 more
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Ray Computation for Non-Uniform Fields
The Journal of the Acoustical Society of America, 1946A formula is derived which simplifies the computation and tracing of rays in non-uniform sound fields. In applying it, a field is first assumed to be equivalent to an array of horizontally homogeneous strata each with a uniform gradient of the speed of sound. Then the “range” of the ray through the whole array can be computed by the formula in one step,
John S. Saby, Wesley L. Nyborg
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Uniform and non-uniform gravitational fields
Physics Education, 2018According to Newtonian mechanics, the gravitational fields created by bodies with spherical symmetry (such as planets) are non-uniform. This may create the impression to undergraduate physics students that uniform gravitational fields are just an approximation.
Stylianos-Vasileios Kontomaris +1 more
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Non-uniform Optical Near-Field
2020The optical near-field (ONF) is an electric field, which is localized at nanoscale materials.
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Non-uniform field breakdown of gases
1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena, 2003The empirical breakdown law is extended to the evaluation of breakdown voltage under nonuniform field conditions. The effects of pressure and gap length are investigated. It is shown that, in nonuniform field conditions, the exponential relation between breakdown voltage and molecular density (pressure) is not affected.
J.-F. Drapeau, G. Olivier, Y. Gervais
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Dielectric polarization in non-uniform fields
Journal of Molecular Structure, 1982Abstract A fluid system containing non-polarizable molecules with a general charge distribution interacting with a static non-uniform field is investigated. The invariance of the dielectric polarization to the arbitrary choice of molecular origin is demonstrated.
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Numerical analysis of quantum-mechanical non-uniform E×B drift: Non-uniform electric field [PDF]
International Journal of Applied Electromagnetics and Mechanics, 2016 We have numerically solved the two-dimensional time-dependent Schrödinger equation for a charged particle in the presence of a non-uniform electric field E = E ≤(1- y / L_E ) e_y as well as a non-uniform magnetic field B = B ≤(1- y / L_B ) e_z. It is shown that such a non-uniformity of the electric field does not affect the time rate of the variance ...
Kosaka, Wataru +2 more
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Magnetic resonance imaging with non-uniform fields
Physics in Medicine and Biology, 1986Various 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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Neocognitron with Non-uniform Receptive Fields
1993The neocognitron is a hierarchical neural network model, which is capable of deformation-resistant pattern recognition. In the conventional neocognitron, each cell has a uniform receptive field. In other words, all parts within a receptive field have the same characteristics.
Kunihiko Fukushima +4 more
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Determining motion fields under non-uniform illumination
Pattern Recognition Letters, 1995Abstract Two realistic methods based on a generalized conservation equation of image brightness are proposed for the accurate determination of motion fields under non-uniform illumination. The conservation equation includes spatial and temporal derivatives of image brightness, a motion vector and a rate of brightness generation.
Atsushi Nomura +2 more
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