Results 1 to 10 of about 398,122 (148)

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   +1 more source

On the Integrability of Quasihomogeneous Systems and Quasidegenerate Infinity Systems

Advances in Difference Equations, 2007
The integrability of quasihomogeneous systems is considered, and the properties of the first integrals and the inverse integrating factors of such systems are shown.
Hu Yanxia
doaj   +2 more sources

Cross-Sectional Blood Metabolite Markers of Hypertension: A Multicohort Analysis of 44,306 Individuals from the COnsortium of METabolomics Studies

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, Ana Nogal, Aurélie Moskal, Neil J. Goulding, Martin J. Shipley, Taryn Alkis, Joni V. Lindbohm, Jie Hu, Domagoj Kifer, Ni Wang, Bo Chawes, Kathryn M. Rexrode, Yoav Ben-Shlomo, Mika Kivimaki, Rachel A. Murphy, Bing Yu, Marc J. Gunter, Karsten Suhre, Deborah A. Lawlor, Massimo Mangino, Cristina Menni   +20 more
doaj   +1 more source

Mendelian Randomization With Refined Instrumental Variables From Genetic Score Improves Accuracy and Reduces Bias

Frontiers in Genetics, 2021
Mendelian randomization (MR) can estimate the causal effect for a risk factor on a complex disease using genetic variants as instrument variables (IVs). A variety of generalized MR methods have been proposed to integrate results arising from multiple IVs
Lijuan Lin, Ruyang Zhang, Ruyang Zhang, Ruyang Zhang, Ruyang Zhang, Hui Huang, Ying Zhu, Yi Li, Xuesi Dong, Xuesi Dong, Sipeng Shen, Liangmin Wei, Xin Chen, David C. Christiani, David C. Christiani, David C. Christiani, Yongyue Wei, Yongyue Wei, Yongyue Wei, Yongyue Wei, Feng Chen, Feng Chen, Feng Chen, Feng Chen   +23 more
doaj   +1 more source

Obesity as a Condition Determined by Food Addiction: Should Brain Endocannabinoid System Alterations Be the Cause and Its Modulation the Solution?

Pharmaceuticals, 2021
Obesity is a complex disorder, and the number of people affected is growing every day. In recent years, research has confirmed the hypothesis that food addiction is a determining factor in obesity. Food addiction is a behavioral disorder characterized by
Marialuisa de Ceglia, Juan Decara, Silvana Gaetani, Fernando Rodríguez de Fonseca   +3 more
doaj   +1 more source

Nilpotent Systems Admitting an Algebraic Inverse Integrating Factor over C((x,y)) [PDF]

, 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, García García, Cristóbal, Matemático, Reyes Columé, Manuel   +2 more
core   +1 more source

Polynomial Inverse Integrating Factors, First Integral and Non-Existence of Limit Cycles in the Plane for Quadratic Systems

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
doaj   +1 more source

Optical properties of apple skin and flesh in the wavelength range from 350 to 2200 nm [PDF]

, 2008
Optical measurement of fruit quality is challenging due to the presence of a skin around the fruit flesh and the multiple scattering by the structured tissues.
Nicolai, Bart, Ramon, H., Saeys, Wouter, Thennadil, Suresh N., Velazco-Roa, Maria A.   +4 more
core   +1 more source

Inverse Jacobian multipliers and Hopf bifurcation on center manifolds [PDF]

, 2014
In this paper we consider a class of higher dimensional differential systems in $\mathbb R^n$ which have a two dimensional center manifold at the origin with a pair of pure imaginary eigenvalues. First we characterize the existence of either analytic or $
Zhang, Xiang
core   +1 more source

Nondegenerate centers for Abel polynomial differential equations of second kind [PDF]

, 2017
In this paper we study the center problem for Abel polynomial differential equations of second kind. Computing the focal values and using modular arithmetics and Gröbner bases we find the center conditions for such systems for lower degrees.The first ...
Giné, Jaume, Valls, Claudia
core   +2 more sources