Results 1 to 10 of about 66 (66)

Almost Periodic Solutions of Abstract Impulsive Volterra Integro-Differential Inclusions

open access: yesFractal and Fractional, 2023
In this paper, we introduce and systematically analyze the classes of (pre-)(B,ρ,(tk))-piecewise continuous almost periodic functions and (pre-)(B,ρ,(tk))-piecewise continuous uniformly recurrent functions with values in complex Banach spaces.
Wei-Shih Du   +2 more
doaj   +1 more source

AN ANTENNA BASED ON A HYBRID METAL–DIELECTRIC STRUCTURE [PDF]

open access: yesRadio Physics and Radio Astronomy, 2021
Purpose: Nowadays, in the millimeter frequency range, the dielectric waveguides of various modifications have certain advantages over the standard metal waveguides, primarily due to the possibility of creating functional units based on them.
D. V. Mayboroda, S. O. Pogarsky
doaj   +1 more source

Weighted Pseudo-θ-Almost Periodic Sequence and Finite-Time Guaranteed Cost Control for Discrete-Space and Discrete-Time Stochastic Genetic Regulatory Networks with Time Delays

open access: yesAxioms, 2023
This paper considers the dual hybrid effects of discrete-time stochastic genetic regulatory networks and discrete-space stochastic genetic regulatory networks in difference formats of exponential Euler difference and second-order central finite ...
Shumin Sun, Tianwei Zhang, Zhouhong Li
doaj   +1 more source

On the Relation Between Fourier Frequency and Period for Discrete Signals, and Series of Discrete Periodic Complex Exponentials

open access: yesIEEE Open Journal of Signal Processing, 2021
Discrete complex exponentials are almost periodic signals, not always periodic; when periodic, the frequency determines the period, but not viceversa, the period being a chaotic function of the frequency, expressible in terms of Thomae's function.
Alfredo Restrepo   +2 more
doaj   +1 more source

The Method of Estimating the Period of a Symbolic Periodic Sequence with Noise, Based on the Sub-Words Positions in the Sequence

open access: yesСовременные информационные технологии и IT-образование, 2020
The method of estimating the period of an almost periodic sequence is proposed. The period of an almost periodic sequence is the length of the smallest periodic pattern that composes the corresponding completely periodic sequence by repetition.
Galina Zhukova   +3 more
doaj   +1 more source

Generalized ρ-Almost Periodic Sequences and Applications

open access: yesFractal and Fractional, 2023
In this paper, we analyze the Bohr ρ-almost periodic type sequences and the generalized ρ-almost periodic type sequences of the form F:I×X→Y, where ∅≠I⊆Zn, X and Y are complex Banach spaces and ρ is a general binary relation on Y.
Marko Kostić   +3 more
doaj   +1 more source

A Stochastic Model of Noises for Periodic Symbol Sequences

open access: yesСовременные информационные технологии и IT-образование, 2019
The construction of almost periodic sequences is needed for the analysis of the cycles’ detection methods, identification of symbolic sequences’ features and sensitivity analysis.
Galina N. Zhukova   +2 more
doaj   +1 more source

Pseudo Almost Periodic Sequence Solutions of Discrete Time Cellular Neural Networks

open access: yesNonlinear Analysis, 2009
In this paper we discuss the existence and uniqueness of a k-pseudo almost periodic sequence solutions of a discrete time neural network. We give several sufficient conditions for the exponential and global attractivity of the solution.
S. Abbas
doaj   +1 more source

Almost Periodic Solutions on a Class Secondorder Differential Equations with Piecewise Constant Argument

open access: yesJournal of Harbin University of Science and Technology, 2019
Almost periodic solutions of differential equations are more general than periodic solutions, so almost periodic solutions will be studied on a class secondorder differential equations with piecewise constant argument.
YAO Hui-li   +2 more
doaj   +1 more source

Regenerative Shaper of Ultrashort Light Pulses

open access: yesPhotonics, 2023
In this article, we propose and demonstrate an ultrashort light pulse regenerative shaper based on a closed-loop double-stage Mamyshev regenerator with an electrically controllable acousto-optic switch.
Kęstutis Regelskis   +2 more
doaj   +1 more source

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