Results 161 to 170 of about 9,017,418 (195)

Existence of positive periodic solutions for a periodic logistic equation

Applied Mathematics and Computation, 2003
The paper deals with existence of \(\omega\)-periodic solutions for the following generalized logistic equations: \[ x'(t)=\pm x(t)\left[f\left(t, \int_{-r(t)}^{-\sigma(t)}x(t+s) d\mu(t,s)\right)-g(t, x(t-\tau(t, x(t))))\right], \] where \(\sigma,r\in C(\mathbb{R},(0,\infty))\) are \(\omega\)-periodic functions with \(\sigma(t)
Guihong Fan, Yongkun Li 0002
openaire   +3 more sources

Positive solutions for sublinear periodic parabolic problems

Nonlinear Analysis: Theory, Methods & Applications, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Godoy, T., Kaufmann, U., Paczka, S.
openaire   +1 more source

Positive periodic solutions of delayed periodic Lotka–Volterra systems

Physics Letters A, 2005
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Lin, Wei, Chen, Tianping
openaire   +2 more sources

Positive periodic solutions of delayed differential equations

Applied Mathematics and Computation, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Bianxia Yang, Ruyun Ma, Chenghua Gao
openaire   +3 more sources

THREE POSITIVE PERIODIC SOLUTIONS OF NONLINEAR DIFFERENTIAL EQUATIONS WITH PERIODIC COEFFICIENTS

Analysis and Applications, 2005
We establish the existence of at least three positive periodic solutions to the second order differential equation with periodic coefficients [Formula: see text] where f is continuous with f(t + T, x) = f(t,x) for (t,x) ∊ R × R and T > 0, p, q are continuous and T-periodic with p > 0 and q ≥ 0.
Liu, Yuji, Ge, Weiguo, Gui, Zhanji
openaire   +1 more source

Existence of positive almost periodic solutions to the hematopoiesis model

Applied Mathematics and Computation, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Toka Diagana, Hui Zhou 0001
openaire   +3 more sources

Positive periodic solutions of first-order singular systems

Applied Mathematics and Computation, 2012
This paper deals with existence and the number of periodic solutions of the first order system \[ u'_i(t)=-a_i(t)u_i(t)+\lambda b_i(t)f_i(\vec u(t)),\quad i=1,\,\dots,\,n\eqno(1) \] where \(\vec u=(u_1,\,\dots,\,u_n)\in{\mathbb R}^n\), \(a_i\) and \(b_i\) are continuous \(T\)-periodic functions with positive mean value in a period, \(f_i: {\mathbb R}^n\
Ruipeng Chen, Ruyun Ma, Zhiqian He
openaire   +2 more sources

Positive periodic solutions for a class of delay differential equations

Applied Mathematics and Computation, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhijie Nan, Weijun Chen, Lin Li
openaire   +3 more sources

Asymptotic Profiles for Positive Solutions in Periodic-Parabolic Problem

Journal of Dynamics and Differential Equations, 2022
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source

On Positive Periodic Solutions to Impulsive Differential Equations with Delays

Results in Mathematics, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Li, Jianli, Shen, Jianhua
openaire   +2 more sources