Inverse matrices for pseudospectral differentiation operators in polar coordinates by stepwise integrations and low-rank updates
Sign Up to like & getrecommendations! Published in 2020 at "Applied Numerical Mathematics"
DOI: 10.1016/j.apnum.2019.10.016
Abstract: Abstract Spectral/pseudospectral integration preconditioning matrices are useful tools for solving differential equations involving pure differential operators d m / d x m . In this study we construct well-conditioned inverse pseudospectral matrices for the basic… read more here.
Keywords: rank updates; inverse matrices; integrations low; polar coordinates ... See more keywords
Hole energy levels and effective g-factor of quantum rings utilizing k.p Hamiltonian in terms of cylindrical polar coordinates
Sign Up to like & getrecommendations! Published in 2018 at "Superlattices and Microstructures"
DOI: 10.1016/j.spmi.2018.10.011
Abstract: Abstract External fields effects on hole energies and effective g-factor of an infinite confining potential quantum ring are theoretically investigated. Based on envelope-function approach within the cylindrical polar coordinates, four band k ⋅ p method… read more here.
Keywords: quantum; energy; polar coordinates; cylindrical polar ... See more keywords
Weighted Clustering Algorithm for Polar Coordinates Applied to FSO Systems Impaired by Atmospheric Turbulence
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DOI: 10.1109/lcomm.2022.3194592
Abstract: Atmospheric turbulence is a major factor limiting the transmission distance of free space optics communication. A novel weighted clustering algorithm based on polar coordinates is proposed in this letter, which can not only solve the… read more here.
Keywords: polar coordinates; fso systems; clustering algorithm; weighted clustering ... See more keywords
Revisiting Radial Distortion Rectification in Polar-Coordinates: A New and Efficient Learning Perspective
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Circuits and Systems for Video Technology"
DOI: 10.1109/tcsvt.2021.3119293
Abstract: Fisheye cameras can capture a large field-of-view (Fov) scene but it introduces severe radial distortion in images. Thus, distortion rectification is a crucial step for subsequent computer vision tasks using fisheye cameras. A prevalent type… read more here.
Keywords: distortion; inline formula; polar coordinates; tex math ... See more keywords