Results 61 to 70 of about 377,631 (158)

Singular perturbations of positivity preserving semigroups via path space techniques

, 1975
Associated with each standard positivity preserving semigroup is a generalized path space. The Feynman-Kac-Nelson formula on path space combined with hypercontractivity of the semigroup allows the control of highly singular perturbations.
Landau, Lawrence J, Klein, Abel
core   +1 more source

Positivity preserving interpolation of positive data by cubic trigonometric spline

, 2011
For smooth and visualizing pleasant curve, we construct a positivity preserving interpolation by using alternative spline that is, cubic trigonometric spline with two shape parameters.
Husna Zayadi
core  

Comparative study of high-order positivity-preserving WENO schemes

, 2012
In gas dynamics and magnetohydrodynamics flows, physically, the density ρ and the pressure p should both be positive. In a standard conservative numerical scheme, however, the computed internal energy is obtained by subtracting the kinetic energy from ...
Kotov, D. V., Yee, Helen C., Sjögreen, Bjorn   +2 more
core  

Optimal shapes for positivity preserving

We are looking for an optimal convex domain on which the boundary value problem $$\left\{\begin{array}{cc}(-Δ)^2 u_γ-γΔu_γ= f,& \mbox{ in }Ω\\ u_γ=\partial_νu_γ=0,& \mbox{ on }\partialΩ\end{array}\right.$$ admits a nonnegative solution for the most $γ$, if $f$ is a given nonnegative function.
openaire   +2 more sources

An unconditionally stable, positivity-preserving splitting scheme for nonlinear Black-Scholes equation with transaction costs. [PDF]

ScientificWorldJournal, 2014
Guo J, Wang W.
europepmc   +1 more source

Positivity preserving interpolation by using rational cubic ball spline

, 2016
This paper discusses the positivity preserving by using rational cubic Ball interpolant of the form cubic/quadratic with two parameters. The sufficient condition for the positivity is derived on one parameter meanwhile the other one is a free parameter ...
Farah Nadhirah
core  

Positivity-Preserving Hybridizable Discontinuous Galerkin Scheme for Solving PNP Model. [PDF]

Entropy (Basel)
Morales D, Xu Z.
europepmc   +1 more source

Stability analysis and numerical simulation of nonlocal extended epidemic models using positivity-preserving scheme. [PDF]

Sci Rep
Yousuf M, Alshakhoury N.
europepmc   +1 more source

Positivity and Green\u27s operators

It is well known that positive Green\u27s operators are not necessarily positivity preserving. In this paper we investigate the matter of just how far from being positivity preserving a positive Green\u27s operator can be.
Raske, David
core  

Comparative Study on High-Order Positivity-preserving WENO Schemes

, 2013
In gas dynamics and magnetohydrodynamics flows, physically, the density and the pressure p should both be positive. In a standard conservative numerical scheme, however, the computed internal energy is obtained by subtracting the kinetic energy from the ...
Kotov, D. V., Yee, H. C., Sjogreen, B.
core