Results 31 to 40 of about 548,121 (295)
Positivity Preserving Multiapproximation
American Journal of Scientific and Industrial Research, 2012 We show that the degree of copositive multipolynomial approximation to a function which changes signs finitely many times in , can be estimated by ...
Eman Bhaya, Mayada Ali
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Positivity of flux vector splitting schemes [PDF]
, 1999 Over the last ten years, robustness of schemes has raised an increasing interest among the CFD community. One mathematical aspect of scheme robustness is the positivity preserving property.
Moschetta, Jean-Marc +2 more
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Fitting Constrained Continuous Spline Curves. [PDF]
, 2003 Fitting a curve through a set of planar data which represents a positive quantity requires that the curve stays above the horizontal axis, The more general problem of designing parametric and non-parametric curves which do not cross the given constraint
Ong, B. H., Kong, V.P.
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Positivity and Monotonicity Preserving Biquartic Rational Interpolation Spline Surface
Journal of Applied Mathematics, 2014 A biquartic rational interpolation spline surface over rectangular domain is constructed in this paper, which includes the classical bicubic Coons surface as a special case.
Xinru Liu, Yuanpeng Zhu, Shengjun Liu
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Position Preserving Multi-Output Prediction [PDF]
, 2013 There is a growing demand for multiple output prediction methods capable of both minimizing residual errors and capturing the joint distribution of the response variables in a realistic and consistent fashion. Unfortunately, current methods are designed to optimize one of the two criteria, but not both.
Zubin Abraham +5 more
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Ergodic semigroups of positivity preserving self-adjoint operators [PDF]
, 1973 We prove that an ergodic semigroup of positivity preserving self-adjoint operators is positivity improving. We also present a new proof (using Markov techniques) of the ergodicity of semigroups generated by spatially cutoff P(ϑ)2 ...
Simon, Barry
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Positivity preservation of implicit discretizations of the advection equation
CoRR, 2021 Preprint: Weierstraß-Institut für Angewandte Analysis und Stochastik, vol ...
Yiannis Hadjimichael +2 more
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Positivity Preserving Limiters for Time-Implicit Higher Order Accurate Discontinuous Galerkin Discretizations [PDF]
, 2019 Currently, nearly all positivity preserving discontinuous Galerkin (DG) discretizations of partial differential equations are coupled with explicit time integration methods.
van der Vegt, J.J.W.; id_orcid +3 more
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Positivity-preserving strategies and their comparision based on staggered CPR methods
Kongqi donglixue xuebaoHigh-order accurate algorithms often encounter numerical instabilities, such as negative density or pressure, when simulating flow fields with strong discontinuities, extremely low density, or low pressure.
Weizhe Wang +3 more
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Positivity of solutions to the Cauchy problem for linear and semilinear biharmonic heat equations
Advances in Nonlinear Analysis, 2020 This paper is concerned with the positivity of solutions to the Cauchy problem for linear and nonlinear parabolic equations with the biharmonic operator as fourth order elliptic principal part. Generally, Cauchy problems for parabolic equations of fourth
Grunau Hans-Christoph +2 more
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