67 citations · 114 across the 7 of their papers we have counts for
8 papers
Stochastic modeling of stratospheric temperature
Mari Dahl Eggen, Kristina Rognlien Dahl, Sven Peter Näsholm +1
This study suggests a stochastic model for time series of daily-zonal (circumpolar) mean stratospheric temperature at a given pressure level. It can be seen as an extension of prev…
Spatial dispersion of elastic waves in a bar characterized by tempered nonlocal elasticity
Vikash Pandey, Sven Peter Näsholm, Sverre Holm
We apply the framework of tempered fractional calculus to investigate the spatial dispersion of elastic waves in a one-dimensional elastic bar characterized by range-dependent nonl…
Comparison of fractional wave equations for power law attenuation in ultrasound and elastography
Sverre Holm, Sven Peter Näsholm
A set of wave equations with fractional loss operators in time and space are analyzed. It is shown that the fractional Szabo equation, the power law wave equation, and the fraction…
SURF imaging beams in an aberrative medium: generation and postprocessing enhancement
Sven Peter Nasholm, Bjørn A. J. Angelsen
This paper presents numerical simulations of dual-frequency second-order ultrasound field (SURF) reverberation suppression transmit-pulse complexes. Such propagation was previously…
Post-Processing Enhancement of Reverberation-Noise Suppression in Dual-Frequency SURF Imaging
Sven Peter Nasholm, Rune Hansen, Bjørn A. J. Angelsen
A post-processing adjustment technique which aims for enhancement of dual-frequency SURF (Second order UltRasound Field) reverberation-noise suppression imaging in medical ultrasou…
Model-based discrete relaxation process representation of band-limited power-law attenuation
Sven Peter Nasholm
Frequency-dependent acoustical loss due to a multitude of physical mechanisms is commonly modeled by multiple relaxations. For discrete relaxation distributions, such models corres…
On a Fractional Zener Elastic Wave Equation
Sven Peter Nasholm, Sverre Holm
This survey concerns a causal elastic wave equation which implies frequency power-law attenuation. The wave equation can be derived from a fractional Zener stress-strain relation p…
A Fractional Acoustic Wave Equation from Multiple Relaxation Loss and Conservation Laws
Sven Peter Näsholm, Sverre Holm
This work concerns causal acoustical wave equations which imply frequency power-law attenuation. A connection between the five-parameter fractional Zener wave equation, which is de…