Results 21 to 30 of about 17,052 (308)

Study of the nonlinear mechanical behavior of rock materials using the FFT numerical method based on the actual mesostructure

open access: yes矿业科学学报, 2022
Rock heterogeneity (such as mineral inclusions, micro-cracks, micro-voids and other microstructures) significantly affects its nonlinear mechanical behavior and failure process.
Li Mingyao   +5 more
doaj   +1 more source

Quantum-inspired algorithms for multivariate analysis: from interpolation to partial differential equations [PDF]

open access: yesQuantum, 2021
In this work we study the encoding of smooth, differentiable multivariate functions in quantum registers, using quantum computers or tensor-network representations. We show that a large family of distributions can be encoded as low-entanglement states of
Juan José García-Ripoll
doaj   +1 more source

Curvelets, Wave Atoms, and Wave Equations [PDF]

open access: yes, 2006
We argue that two specific wave packet families---curvelets and wave atoms---provide powerful tools for representing linear systems of hyperbolic differential equations with smooth, time-independent coefficients.
Demanet, Laurent
core   +1 more source

Generalized Orthogonal Discrete W Transform and Its Fast Algorithm

open access: yesDiscrete Dynamics in Nature and Society, 2021
Based on the generalized discrete Fourier transform, the generalized orthogonal discrete W transform and its fast algorithm are proposed and derived in this paper. The orthogonal discrete W transform proposed by Zhongde Wang has only four types. However,
Jichao Sun, Zhengping Zhang
doaj   +1 more source

Fast Complexified Quaternion Fourier Transform [PDF]

open access: yesIEEE Transactions on Signal Processing, 2008
A discrete complexified quaternion Fourier transform is introduced. This is a generalization of the discrete quaternion Fourier transform to the case where either or both of the signal/image and the transform kernel are complex quaternion-valued. It is shown how to compute the transform using four standard complex Fourier transforms and the properties ...
Salem Said   +2 more
openaire   +3 more sources

Determination of Anti Colon Cancer Drug, Irinotecan by Fast Fourier Transforms Continuous Cyclic Voltammetry

open access: yesInternational Journal of Electrochemical Science, 2009
In this work a novel method for the determination of irinotecan, an anti colon cancer drug, in flow-injection systems has been developed. The fast Fourier transform continuous cyclic voltammetry (FFTCV) at gold microelectrode in flowing solution system ...
Parviz Norouzi   +3 more
doaj   +1 more source

Selective Rapid Eye Movement Sleep Deprivation Affects Cell Size and Number in Kitten Locus Coeruleus

open access: yesFrontiers in Neurology, 2012
Cells in the locus coeruleus (LC) constitute the sole source of norepinephrine (NE) in the brain, and change their discharge rates according to vigilance state.
James P Shaffery   +3 more
doaj   +1 more source

A Fast Fourier Transform for the Johnson Graph

open access: yesJournal of Fourier Analysis and Applications, 2022
21 pages, 8 figures.
Rodrigo Iglesias, Mauro Natale
openaire   +2 more sources

Learning Fast Sparsifying Transforms

open access: yes, 2016
Given a dataset, the task of learning a transform that allows sparse representations of the data bears the name of dictionary learning. In many applications, these learned dictionaries represent the data much better than the static well-known transforms (
Thompson, John S, Rusu, Cristian
core   +1 more source

Dataset of quantitative structured office measurements of movements in the extremities

open access: yesData in Brief, 2020
A low-cost quantitative structured office measurement of movements in the extremities of people with Parkinson's disease [1,2] was performed on people with Parkinson's disease, multiple system atrophy, and age-matched healthy volunteers.
Timothy P. Harrigan   +13 more
doaj   +1 more source

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