Results 31 to 40 of about 1,382,450 (317)

$M$-periodic problem of order $2k$ [PDF]

Topological Methods in Nonlinear Analysis, 1998
The author gives sufficient conditions for the existence of solutions to some general matrix-periodic problems of higher even order, which have a variational structure. A key tool in the proofs is a generalization of the Du Bois-Reymond lemma for periodic functions of order one, which was proved by the author in a previous work [Gȩba, Kazimierz (ed ...
openaire   +4 more sources

From the Fibonacci Icosagrid to E₈ (Part II): The Composite Mapping of the Cores

Crystals
This paper is part of a series that describes the Fibonacci icosagrid quasicrystal (FIG) and its relation to the E8 root lattice. The FIG was originally constructed to represent the intersection points of an icosahedrally symmetric collection of planar ...
Richard Clawson, Fang Fang, Klee Irwin
doaj   +1 more source

Non-existence of periodic solutions in fractional-order dynamical systems and a remarkable difference between integer and fractional-order derivatives of periodic functions

, 2011
Using the Mellin transform approach, it is shown that, in contrast with integer-order derivatives, the fractional-order derivative of a periodic function cannot be a function with the same period.
Kaslik, Eva, Sivasundaram, Seenith
core   +1 more source

Periodic Quasiregular Mappings of Finite Order

Revista Matemática Iberoamericana, 2003
The authors construct a periodic quasiregular function of any finite order \rho , 1\leq\rho < \infty . This completes earlier work of O. Martio and U. Srebro.
Drasin, David, Sastry, Swati
openaire   +4 more sources

Periodic solutions of nonlinear second-order difference equations

Advances in Difference Equations, 2005
We establish conditions for the existence of periodic solutions of nonlinear, second-order difference equations of the form y(t + 2) + by (t + 1) + cy(t) = f (y(t)), where f: ℝ → ℝ and β > 0 is continuous. In our main result we
Etheridge Debra Lynn, Rodriguez Jesús   +1 more
doaj   +2 more sources

Positive Periodic Solutions for First-Order Neutral Functional Differential Equations with Periodic Delays

Abstract and Applied Analysis, 2012
In this paper, two classes of first-order neutral functional differential equations with periodic delays are considered. Some results on the existence of positive periodic solutions for the equations are obtained by using the Krasnoselskii fixed point ...
Zeqing Liu, Xin Li, Shin Min Kang, Young Chel Kwun   +3 more
doaj   +1 more source

Periodic solutions of forced Kirchhoff equations

, 2007
We consider Kirchhoff equations for vibrating bodies in any dimension in presence of a time-periodic external forcing with period 2pi/omega and amplitude epsilon, both for Dirichlet and for space-periodic boundary conditions.
Baldi, Pietro
core   +3 more sources

Practical challenges in data‐driven interpolation: Dealing with noise, enforcing stability, and computing realizations

International Journal of Adaptive Control and Signal Processing, EarlyView., 2023
Summary In this contribution, we propose a detailed study of interpolation‐based data‐driven methods that are of relevance in the model reduction and also in the systems and control communities. The data are given by samples of the transfer function of the underlying (unknown) model, that is, we analyze frequency‐response data.
Quirin Aumann, Ion Victor Gosea
wiley   +1 more source

Periodic solutions of third order differential equations

Journal of Innovative Applied Mathematics and Computational Sciences
In this paper, we study the existence of periodic solutions for the following piecewise third-order differential equation: $$ \dddot{x}+\dot{x}-\varepsilon\sum\limits_{i=1}^{2}c_i|x|^i=0, $$ with $\varepsilon$ a real parameter sufficiently small, $c_1$
Nabil Rezaiki, Amel Boulfoul
doaj   +1 more source

A microquasar classification from a disk instability perspective [PDF]

, 2010
The spectacular variability of microquasars has led to a long string of efforts in order to classify their observed behaviors in a few states. The progress made in the understanding of the Quasi-Periodic Oscillations observed in these objects now makes ...
Belloni, Belloni, Casella, Casse, Caunt, Dieters, Eikenberry, Fender, Gogus, Homan, Homan, J. Rodriguez, Kato, Lovelace, M. Tagger, Meheut, Mikles, Mirabel, Morgan, Munoz-Darias, Nowak, P. Varniere, Paczyńsky, Prat, Remillard, Remillard, Revnivtsev, Rodriguez, Rodriguez, Rodriguez, Rodriguez, Sobczak, Soleri, Tagger, Tagger, Tagger, Tagger, Van der Klis, Varniere, Varniere, Wagoner, Wijnands   +41 more
core   +5 more sources