Results 1 to 10 of about 395,045 (283)
Nilpotent Systems Admitting an Algebraic Inverse Integrating Factor over C((x,y)) [PDF]
Qualitative Theory of Dynamical Systems, 2011 We characterize the nilpotent systems whose lowest degree quasihomogeneous term is (y, σ xn)T, σ = ±1, which have an algebraic inverse integrating factor over C((x,y)) .
Algaba Durán, Antonio +2 more
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The Poincaré map of degenerate monodromic singularities with Puiseux inverse integrating factor
Advances in Nonlinear Analysis, 2023 We consider analytic families of planar vector fields depending analytically on the parameters in Λ\Lambda that guarantee the existence of a (may be degenerate and with characteristic directions) monodromic singularity.
García Isaac A., Giné Jaume
doaj +2 more sources
Science Journal of University of Zakho, 2017 The main purpose of this paper is to study the existence of polynomial inverse integrating factor and first integral, and non-existence of limit cycles for all systems. Furthermore, we consider some applications.
Ahmed M. Hussien
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Non-existence of limit cycles via inverse integrating factors
Electronic Journal of Differential Equations, 2011 It is known that if a planar differential systems has an inverse integrating factor, then all the limit cycles contained in the domain of definition of the inverse integrating factor are contained in the zero set of this function.
Leonardo Laura-Guarachi +2 more
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Food-specific IgG antibodies and body mass index: multivariate analysis of clinical correlations in underweight populations [PDF]
Frontiers in ImmunologyBackgroundThis study investigates the relationship between food-specific IgG antibodies and nutritional status in underweight populations, addressing a critical gap in existing research focused predominantly on obesity.
Yao-Chi Zeng +6 more
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Polynomial inverse integrating factors of quadratic differential systems and other results [PDF]
, 2006 Consultable des del TDXTítol obtingut de la portada digitalitzadaAquesta tesi està dividida en dues parts diferents. En la primera, estudiam els sistemes quadràtics (sistemes polinomials de grau dos) que tenen un invers de factor integrant polinomial. En
Ferragut, Antoni
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JMIR Medical InformaticsBackgroundStroke remains one of the leading causes of mortality and long-term disability worldwide. Atrial fibrillation (AF) is a major and often underdiagnosed risk factor for ischemic stroke as it is frequently asymptomatic and may remain undetected ...
Yu-Wei Chen +3 more
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Morphisms and inverse problems for Darboux integrating factors [PDF]
Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2021 Polynomial vector fields which admit a prescribed Darboux integrating factor are quite well understood when the geometry of the underlying curve is non-degenerate. In the general setting, morphisms of the affine plane may remove degeneracies of the curve, and thus allow more structural insight.
Llibre Saló, Jaume +2 more
openaire +7 more sources
Center problem with characteristic directions and inverse integrating factors [PDF]
Communications in Nonlinear Science and Numerical Simulation, 2022 We consider the center-focus problem for analytic families of planar vector fields having a monodromic singularity with characteristic directions. We give a method to compute the center conditions of the family provided there is an inverse integrating factor whose expression in polar coordinates has the exceptional divisor of the first polar blow-up as
Isaac A. García, Jaume Giné
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Metabolites, 2022 Hypertension is the main modifiable risk factor for cardiovascular morbidity and mortality but discovering molecular mechanisms for targeted treatment has been challenging. Here we investigate associations of blood metabolite markers with hypertension by
Panayiotis Louca +20 more
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