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Axioms, Volume 13, Issue 2

February 2024 - 62 articles

Cover Story: In this, we propose a method able to model fractional behaviors with convolution models involving non-singular kernels rather than the usual fractional calculus-based models. If the fractional behavior is a pure power law function, a particular rational kernel made of alternate poles and zeros permits accurate fitting on a time range. This fitting solution, similar to the one commonly employed in the frequency domain to approximate fractional integrator behavior, is performed here in the time domain; its leads to fewer gain and phase oscillations for a given number of poles and zeros. This approach also permits physical interpretation to be performed in terms of the delay distributions close to the probabilistic interpretation of the fractional behaviors involved in phenomena such as diffusion, adsorption or aggregation. View this paper
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Articles (62)

  • Article
  • Open Access
3 Citations
2,570 Views
20 Pages

19 February 2024

The Bessel function of the first kind JNkx is expanded in a Fourier–Legendre series, as is the modified Bessel function of the first kind INkx. The purpose of these expansions in Legendre polynomials was not an attempt to rival established nume...

  • Article
  • Open Access
7 Citations
2,058 Views
19 Pages

19 February 2024

In this study, we present the generalized form of the higher-order nonlinear fractional Bratu-type equation. In this generalization, we deal with a generalized fractional derivative, which is quite useful from an application point of view. Furthermor...

  • Article
  • Open Access
3 Citations
1,659 Views
16 Pages

19 February 2024

In Chuanming Zong’s program to attack Hadwiger’s covering conjecture, which is a longstanding open problem from Convex and Discrete Geometry, it is essential to estimate covering functionals of convex bodies effectively. Recently, He et a...

  • Article
  • Open Access
5 Citations
2,871 Views
16 Pages

Study of Uniqueness and Ulam-Type Stability of Abstract Hadamard Fractional Differential Equations of Sobolev Type via Resolvent Operators

  • Khellaf Ould Melha,
  • Abdelhamid Mohammed Djaouti,
  • Muhammad Amer Latif and
  • Vaijanath L. Chinchane

19 February 2024

This paper focuses on studying the uniqueness of the mild solution for an abstract fractional differential equation. We use Banach’s fixed point theorem to prove this uniqueness. Additionally, we examine the stability properties of the equation...

  • Article
  • Open Access
1 Citations
1,710 Views
11 Pages

19 February 2024

We propose a new tool for estimating the complexity of a time series: the entropy of difference (ED). The method is based solely on the sign of the difference between neighboring values in a time series. This makes it possible to describe the signal...

  • Article
  • Open Access
3 Citations
1,960 Views
17 Pages

On the Exact Solution of a Scalar Differential Equation via a Simple Analytical Approach

  • Nada A. M. Alshomrani,
  • Abdelhalim Ebaid,
  • Faten Aldosari and
  • Mona D. Aljoufi

19 February 2024

The existence of the advance parameter in a scalar differential equation prevents the application of the well-known standard methods used for solving classical ordinary differential equations. A simple procedure is introduced in this paper to remove...

  • Article
  • Open Access
1,375 Views
9 Pages

The Average Sentinel of the Heat Equation with an Unknown Reaction

  • Houria Selatnia,
  • Abdelhamid Ayadi and
  • Imad Rezzoug

19 February 2024

In this paper, we analyze the identification of the amount of pollutant discharged problem by each source in a heat system when the dynamics of the state are governed by a parameterized unknown operator. In this way, we introduce the notion of averag...

  • Article
  • Open Access
2,085 Views
18 Pages

Widest Path in Networks with Gains/Losses

  • Javad Tayyebi,
  • Mihai-Lucian Rîtan and
  • Adrian Marius Deaconu

18 February 2024

In this paper, the generalized widest path problem (or generalized maximum capacity problem) is studied. This problem is denoted by the GWPP. The classical widest path problem is to find a path from a source (s) to a sink (t) with the highest capacit...

  • Article
  • Open Access
1 Citations
1,738 Views
23 Pages

18 February 2024

In this paper, a class of nonlinear ordinary differential equations with impulses at variable times is considered. The existence and uniqueness of the solution are given. At the same time, modifying the classical definitions of continuous dependence...

  • Article
  • Open Access
1 Citations
3,046 Views
22 Pages

17 February 2024

Count data consists of both observed and unobserved events. The analysis of count data often encounters overdispersion, where traditional Poisson models may not be adequate. In this paper, we introduce a tractable one-parameter mixed Poisson distribu...

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Axioms - ISSN 2075-1680