Results 11 to 20 of about 235,909 (235)
Full-model wavenumber inversion: An emphasis on the appropriate wavenumber continuation [PDF]
GEOPHYSICS, 2016 A model of the earth can be described using a Fourier basis represented by its wavenumber content. In full-waveform inversion (FWI), the wavenumber description of the model is natural because our Born-approximation-based velocity updates are made up of wavefields.
T. Alkhalifah
openaire +3 more sources
Wavenumber-Division Multiplexing in Line-of-Sight Holographic MIMO Communications [PDF]
IEEE Transactions on Wireless Communications, 2021 Starting from first principles of wave propagation, we consider a multiple-input multiple-output (MIMO) representation of a communication system between two spatially-continuous volumes. This is the concept of holographic MIMO communications.
L. Sanguinetti +2 more
semanticscholar +1 more source
On the wavenumber–frequency spectrum of the wall pressure fluctuations in turbulent channel flow [PDF]
Journal of Fluid Mechanics, 2022 Direct numerical simulations (DNS) of turbulent channel flows up to ${Re}_{\tau} \approx 1000$ are conducted to investigate the three-dimensional (consisting of streamwise wavenumber, spanwise wavenumber and frequency) spectrum of wall pressure ...
Bowen Yang, Zixuan Yang
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Talanta: The International Journal of Pure and Applied Analytical Chemistry, 2021 This study utilizes advanced wavenumber selection techniques to improve the prediction of amylose content in grounded rice samples with near-infrared spectroscopy. Four different wavenumber selection techniques, i.e.
P. Mishra, E. Woltering
semanticscholar +1 more source
, 2021 Composite-overwrapped pressure vessels (COPV) are increasingly used in the transportation industry due to their high strength to mass ratio. Throughout the years, various designs were developed and found their applications.
Y. Lugovtsova +5 more
semanticscholar +1 more source
Acoustic transmission problems: Wavenumber-explicit bounds and resonance-free regions [PDF]
Mathematical Models and Methods in Applied Sciences, 2017 We consider the Helmholtz transmission problem with one penetrable star-shaped Lipschitz obstacle. Under a natural assumption about the ratio of the wavenumbers, we prove bounds on the solution in terms of the data, with these bounds explicit in all ...
A. Moiola, E. Spence
semanticscholar +1 more source
Lift-up, Kelvin-Helmholtz and Orr mechanisms in turbulent jets [PDF]
, 2020 Three amplification mechanisms present in turbulent jets, namely lift-up, Kelvin–Helmholtz and Orr, are characterized via global resolvent analysis and spectral proper orthogonal decomposition (SPOD) over a range of Mach numbers.
Cavalieri, André V. G. +5 more
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The effect of asymmetric large-scale dissipation on energy and potential enstrophy injection in two-layer quasi-geostrophic turbulence [PDF]
, 2011 In the Nastrom-Gage spectrum of atmospheric turbulence we observe a $k^{-3}$ energy spectrum that transitions into a $k^{-5/3}$ spectrum, with increasing wavenumber $k$.
Gkioulekas, Eleftherios
core +1 more source
A robust method for measurement of fluctuation parallel wavenumber in laboratory plasmas [PDF]
, 2009 Measuring the parallel wavenumber is fundamental for the experimental characterization of electrostatic instabilities. It becomes particularly important in toroidal geometry, where spatial inhomogeneities and curvature can excite both drift instabilities,
A. Fasoli +5 more
core +1 more source
A Study of Wave Refraction in a Marginal Ice Zone: Frazil-Pancake Ice
IEEE Access, 2020 Theoretical estimates based on both offline calculation and an online model are made to study the wavenumber variations during wave refraction in a marginal ice zone (MIZ).
Haijin Dai, Jun Zhao, Xueyan Zhang
doaj +1 more source