نتایج جستجو برای: spectral moments
تعداد نتایج: 198162 فیلتر نتایج به سال:
A rigorous full-wave modal analysis based on the method of moments in spectral domain is presented for line waveguides constituted by two-part impedance planes with arbitrary anisotropic surface impedances. An integral equation formulated introducing an auxiliary current sheet one two half and extending boundary condition complementary plane to hold entire plane. The then discretized domain, em...
Reduction of the quality of the image formed by an optical system is a function of different parameters such as lens aberrations, CCD digitization errors, and the errors of system assembling. Assembling errors usually consist of two types: 1) the prism error, which is the error of non-orthogonality of the optical axis and the image plane 2) the de-centering error, which is error of not passing ...
In the third generation cellular radio system, a variable spreading factor (VSF) and a multi-code (MC) schemes are adopted to support multirate data transmission. Although these schemes affect the statistics of intercell interference and therefore the spectral efficiency, their precise impact is not completely understood. In this letter, a closed-form solution for the moments of the reverse lin...
This study presents a comparative analysis of acoustic and perceptual cues to place of articulation in English fricatives. Acoustic parameters investigated include spectral peak location, spectral moments, locus equations, F2 onset, overall noise amplitude, relative amplitude, and fricative noise duration. Perception data were collected for isolated fricatives and fricativevowel syllables. The ...
We introduce a new micro/macro decomposition of collisional kinetic equations which naturally incorporates the exact space boundary conditions. The idea is to write the distribution fonction f in all its domain as the sum of a Maxwellian adapted to the boundary (which is not the usual Maxwellian associated with f) and a reminder kinetic part. This Maxwellian is defined such that its ’incoming’ ...
This paper describes a new method for recovering the perspective geometry of textured planes from local spectral analysis. The novel contribution of the work is to use the angular distribution of texture moments to locate the vanishing point of textured planes viewed under perspective geometry. Our key observation is that lines of uniform spectral orientation radiate from the vanishing point. W...
Previously, concentric coplanar capacitive sensors have been developed to quantitatively characterize the permittivity or thickness of one layer in multi‐layered dielectrics. Electrostatic Green’s functions due to a point source at the surface of one‐ to three‐layered test‐pieces were first derived in the spectral domain, under the Hankel transform. Green’s functions in the spatial domain were ...
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