Results 11 to 20 of about 18,081 (306)
Positivity Preservation Properties of the Rantzer Multipliers
IEEE Transactions on Automatic Control, 2011 The Rantzer multipliers are known to preserve the positivity of certain aberrations of memoryless monotone positive nonlinearities. We show that if the nonlinearity input is constrained to be positive valued for all time instants, these multipliers are positivity preserving for a larger class of nonlinearities.
Vishwesh V Kulkarni +2 more
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Preserving Positive Intermediate Curvature
The Journal of Geometric Analysis, 2023 AbstractConsider a compact manifoldN(with or without boundary) of dimensionn. Positivem-intermediate curvature interpolates between positive Ricci curvature ($$m = 1$$m=1) and positive scalar curvature ($$m = n-1$$m=n-1), and it is obstructed on partial tori$$N^n = M^{n-m} \times \mathbb {T}^m$$Nn=Mn-m×Tm. Given Riemannian metrics$$g, {\bar{g}}$$g,g¯on$
Tsz-Kiu Aaron Chow +2 more
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Experiments with a Positivity-Preserving Operator [PDF]
Experimental Mathematics, 2008 We consider some multivariate rational functions which have (or are conjectured to have) only positive coefficients in their series expansion. We consider an operator that preserves positivity of series coefficients, and apply the inverse of this operator to the rational functions.
Manuel Kauers, Doron Zeilberger
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A positivity-preserving scheme for fluctuating hydrodynamics
Journal of Computational Physics, 2022 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Francesco Magaletti +4 more
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Journal of Head & Neck Physicians and Surgeons, 2023 Background: Early glottic cancers can be treated using different options such as transoral laser microsurgery (TLM), open partial laryngectomy (OPL), and radiation therapy (RT).
Elizabeth Mathew Iype +4 more
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Positivity-preserving methods for population models
CoRR, 2021 Many important applications are modelled by differential equations with positive solutions. However, it remains an outstanding open problem to develop numerical methods that are both (i) of a high order of accuracy and (ii) capable of preserving positivity.
Sergio Blanes +2 more
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Positivity-preserving adaptive Runge–Kutta methods [PDF]
Communications in Applied Mathematics and Computational Science, 2021 Many important differential equations model quantities whose value must remain positive or stay in some bounded interval. These bounds may not be preserved when the model is solved numerically. We propose to ensure positivity or other bounds by applying Runge-Kutta integration in which the method weights are adapted in order to enforce the bounds.
Stephan Nüßlein +2 more
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Turkish Archives of Otorhinolaryngology, 2022 Objective:The purpose of this study was to evaluate the functional and oncological outcomes of total glossectomy with laryngeal preservation (TGLP) compared to near-total glossectomy with laryngeal preservation (nTGLP).Methods:In this retrospective study,
Uygar Levent Demir +2 more
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Positivity preserving finite element approximation [PDF]
Mathematics of Computation, 2001 We consider finite element operators defined on “rough” functions in a bounded polyhedron Ω \Omega
Ricardo H. Nochetto, Lars B. Wahlbin
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Representation and Approximation of Positivity Preservers [PDF]
Journal of Geometric Analysis, 2010 17 ...
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