Results 11 to 20 of about 285,537 (315)
Weighted Fractional-Order Transform Based on Periodic Matrix
Mathematics, 2021 Tao et al. proposed the definition of the linear summation of fractional-order matrices based on the theory of Yeh and Pei. This definition was further extended and applied to image encryption. In this paper, we propose a reformulation of the definitions
Tieyu Zhao, Yingying Chi
doaj +1 more source
Essentially periodic ordered groups
Annals of Pure and Applied Logic, 2000 The authors introduce and study a number of notions extending that of an o-minimal group; i.e., they investigate totally ordered groups with certain restrictions on definable subsets. They also prove a number of interesting results relating the different notions. Some but not all of these notions are closed under elementary equivalence.
Françoise Point, Frank O. Wagner
openaire +1 more source
THE FOURTH ORDER MIXED PERIODIC RECURRENCE FRACTIONS
Journal of Vasyl Stefanyk Precarpathian National University, 2015 Offered economical algorithm for calculation of rational shortenings of thefourth-order mixed periodic recurrence fraction.
A.V. Semenchuk, R.A. Zatorsky
doaj +1 more source
Periodic solutions of higher order systems [PDF]
Pacific Journal of Mathematics, 1979 where u, g, and / are Λ-vectors. We will establish the existence of T-periodic solutions to (1.1) for large classes of nonlinearities g and forcing terms /. In particular we include cases where g is bounded, sublinear, or superlinear in u9 with arbitrary growth in the other arguments of g in the latter case.
Bates, P. W., Ward, J. R.
openaire +3 more sources
First order impulsive differential inclusions with periodic conditions
Electronic Journal of Qualitative Theory of Differential Equations, 2008 In this paper, we present an impulsive version of Filippov's Theorem for the first-order nonresonance impulsive differential inclusion $$ \begin{array}{rlll} y'(t)-\lambda y(t) &\in& F(t,y(t)), &\hbox{ a.e. } \, t\in J\backslash \{t_{1},\ldots,t_{m}\},\\
John Graef, Abdelghani Ouahab
doaj +1 more source
Second order homogenization of quasi-periodic structures
Vietnam Journal of Mechanics, 2018 The paper develops a general framework to derive the effective properties of quasi-periodic elastic medium. By using the asymptotic expansion method, the solution is expanded to the second order by solving a sequence of minimization problems.
Duc Trung Le, Jean-Jacques Marigo
doaj +1 more source
Discovering High-Order Periodic Patterns [PDF]
Knowledge and Information Systems, 2004 Discovery of periodic patterns in time series data has become an active research area with many applications. These patterns can be hierarchical in nature, where a higher-level pattern may consist of repetitions of lower-level patterns. Unfortunately, the presence of noise may prevent these higher-level patterns from being recognized in the sense that ...
Jiong Yang 0001 +2 more
openaire +1 more source
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 c≠0 and f:â„Â→℠is continuous.
Debra Lynn Etheridge +1 more
doaj +2 more sources
Periodic solutions of second-order nonautonomous dynamical systems
Boundary Value Problems, 2006 We study the existence of periodic solutions for second-order nonautonomous dynamical systems. We give four sets of hypotheses which guarantee the existence of solutions.
Schechter Martin
doaj +2 more sources
Periodic perturbations of non-conservative second order differential equations
Electronic Journal of Qualitative Theory of Differential Equations, 2002 Consider the Lienard system $u''+f(u) u'+g(u)=0$ with an isolated periodic solution. This paper concerns the behavior of periodic solutions of Lienard system under small periodic perturbations.
R. A. Chouikha
doaj +1 more source