Results 11 to 20 of about 65,900 (146)
Membranes, 2021 Membrane performance in gas separation is quantified by its selectivity, determined as a ratio of measured gas permeabilities of given gases at fixed pressure difference.
Lukáš Mrazík, Pavel Kříž
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Nonlinear Diffusion in Transparent Media [PDF]
International Mathematics Research Notices, 2021 AbstractWe consider a prototypical nonlinear parabolic equation whose flux has three distinguished features: it is nonlinear with respect to both the unknown and its gradient, it is homogeneous, and it depends only on the direction of the gradient. For such equation, we obtain existence and uniqueness of entropy solutions to the Dirichlet problem, the ...
Lorenzo Giacomelli +2 more
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Hybrid Lattice Boltzmann Model for Nonlinear Diffusion and Image Denoising
Mathematics, 2023 In the present paper, a novel approach for image denoising based on the numerical solution to the nonlinear diffusion equation is proposed. The Perona–Malik-type equation is solved by employing a hybrid lattice Boltzmann model with five discrete ...
Oleg Ilyin
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SRP‐AKAZE: an improved accelerated KAZE algorithm based on sparse random projection
IET Computer Vision, 2020 The AKAZE algorithm is a typical image registration algorithm that has the advantage of high computational efficiency based on non‐linear diffusion.
Dan Li +3 more
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Reaction-diffusion processes with nonlinear diffusion [PDF]
Physical Review E, 2012 We study reaction-diffusion processes with concentration-dependent diffusivity. First, we determine the decay of the concentration in the single-species and two-species diffusion-controlled annihilation processes. We then consider two natural inhomogeneous realizations.
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Artifact Suppressed Nonlinear Diffusion Filtering for Low-Dose CT Image Processing
IEEE Access, 2019 Computed tomography (CT) images with a low-dose protocol generally have severe mottle noise and streak artifacts. In this paper, we propose a novel diffusion method named “artifact suppressed nonlinear diffusion filtering (ASNDF),” to ...
Yi Liu +4 more
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Investigation of the Diffusion Impedance for an Irreversible Redox Reaction
International Journal of Electrochemical Science, 2021 Simple reactant diffusion can be analysed reliably over a finite diffusion layer. The diffusional impedance may be affected by issues arising from homogeneous reactions, variable properties, or ionic migration, and hence more detailed research is needed.
M. Chitra Devi +3 more
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Equations for nonlinear diffusion
Lietuvos Matematikos Rinkinys, 2010 The diffusion is the result of Brownian movement and occurs with a finite velocity. We presented the nonlinear diffusion equation, with diffusion coefficient directly proportional to the impurities concentration.
Arvydas Juozapas Janavičius
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Nonlinear Horizontal Diffusion for GCMs [PDF]
Monthly Weather Review, 2007 Abstract The mixing-length-based parameterization of horizontal diffusion, which was originally proposed by Smagorinsky, is revisited. The complete tendencies of horizontal momentum diffusion, the associated frictional heating, and horizontal diffusion of sensible heat in spherical geometry are derived.
Becker, Erich, Burkhardt, Ulrike
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Nonlinear thermal conductivity in gases
Lietuvos Matematikos Rinkinys, 2016 The nonlinear diffusion equation corresponds to the diffusion processes which can occur with a finite velocity. A.J. Janavičius proposed nonlinear equation which describes more exactly the diffusion of impurities in Si crystals in many interesting ...
Arvydas Juozapas Janavičius +1 more
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