955 resultados para Query expansion


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[view of the south scoreboard and sign with new capacityof 97,000]

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["Germany" Schulz inspects expansion work at Michigan Stadium, 1949]

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[Installing seats on east side]

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[Welding seat brackets]

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"Ouvrage ayant obtenu le prix du roi."

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Includes bibliographical references.

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"December, 1996."

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Thesis (Ph.D.)--University of Washington, 2016-04

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Multipole expansion of an incident radiation field-that is, representation of the fields as sums of vector spherical wavefunctions-is essential for theoretical light scattering methods such as the T-matrix method and generalised Lorenz-Mie theory (GLMT). In general, it is theoretically straightforward to find a vector spherical wavefunction representation of an arbitrary radiation field. For example, a simple formula results in the useful case of an incident plane wave. Laser beams present some difficulties. These problems are not a result of any deficiency in the basic process of spherical wavefunction expansion, but are due to the fact that laser beams, in their standard representations, are not radiation fields, but only approximations of radiation fields. This results from the standard laser beam representations being solutions to the paraxial scalar wave equation. We present an efficient method for determining the multipole representation of an arbitrary focussed beam. (C) 2003 Elsevier Science Ltd. All rights reserved.