Zobrazeno 1 - 10
of 580
pro vyhledávání: '"R, Attia"'
Autor:
Emad R. Attia
Publikováno v:
AIMS Mathematics, Vol 9, Iss 9, Pp 23564-23583 (2024)
This work is devoted to studying the distribution of zeros of a first-order neutral differential equation with several delays$ \begin{equation*} \left[y(t)+a(t)y\left(t-\sigma\right)\right]'+ \sum\limits_{j = 1}^n b_j(t)y\left(t-\mu_j\right) = 0, \qu
Externí odkaz:
https://doaj.org/article/4ac8233fdedc47319ab0ce46538b5a74
Publikováno v:
AIMS Mathematics, Vol 9, Iss 8, Pp 23128-23141 (2024)
Using comparison principles, we examine the asymptotic characteristics of a third-order nonlinear damped neutral differential equation. Our results substantially generalize numerous previously established results as well as drastically improving them
Externí odkaz:
https://doaj.org/article/78abd3c463e84400bb56256082172b66
Autor:
Mohamed M. Zedan, Ali Sobh, Alshimaa Magdy, Mai S. Korkor, Zeinab R. Attia, Nada Khaled, Yousra Sadeq, Ahmed Hazem El-Nagdy, Ahmed E. Taha, Mohamed Ahmed Noureldin, Mohamed Taman, Doaa Mosad Mosa, Marwa H. Elnagdy
Publikováno v:
Pediatric Rheumatology Online Journal, Vol 22, Iss 1, Pp 1-11 (2024)
Abstract Background Measurement of the circulating levels of long-non-coding RNAs (lncRNAs) in lupus nephritis (LN) patients could dramatically explore more insights about the disease pathogenesis. Hence, we aimed to quantify the level of expression
Externí odkaz:
https://doaj.org/article/965048697e8e4f1fbe2eb6961400a9df
Autor:
Emad R. Attia, Hassan A. El-Morshedy
Publikováno v:
Boundary Value Problems, Vol 2023, Iss 1, Pp 1-19 (2023)
Abstract We use an improved technique to establish new sufficient criteria of product type for the oscillation of the delay differential equation x ′ ( t ) + ∑ l = 1 m b l ( t ) x ( σ l ( t ) ) = 0 , t ≥ t 0 , $$\begin{aligned} x'(t)+\sum_{l=1
Externí odkaz:
https://doaj.org/article/92a4674e914f4676891eaa4003c882ef
Autor:
Emad R. Attia, Bassant M. El-Matary
Publikováno v:
Journal of Inequalities and Applications, Vol 2023, Iss 1, Pp 1-12 (2023)
Abstract The distance between consecutive zeros of a first-order differential equation with several variable delays is studied. Here, we show that the distribution of zeros of differential equations with variable delays is not an easy extension of th
Externí odkaz:
https://doaj.org/article/da60be8d6e434aa992009f2d02f4971e
Autor:
Emad R. Attia, George E. Chatzarakis
Publikováno v:
AIMS Mathematics, Vol 8, Iss 3, Pp 6725-6736 (2023)
In this work, we study the oscillation problem of first-order differential equations with deviating arguments and oscillatory coefficients. We generalize and improve the work of Kwong [30] such that the delay (advanced) and the coefficient functions
Externí odkaz:
https://doaj.org/article/cede6b3fb6874939822c834cb8502f53
Publikováno v:
Opuscula Mathematica, Vol 42, Iss 6, Pp 769-791 (2022)
In this paper, we study the oscillatory behavior of the solutions of a first-order difference equation with non-monotone retarded argument and nonnegative coefficients, based on an iterative procedure. We establish some oscillation criteria, involvin
Externí odkaz:
https://doaj.org/article/2bb054450ed84f65b450c278d4c6c0b8
Autor:
Emad R. Attia, Bassant M. El-Matary
Publikováno v:
Opuscula Mathematica, Vol 42, Iss 3, Pp 393-413 (2022)
We study the oscillation of first-order linear difference equations with non-monotone deviating arguments. Iterative oscillation criteria are obtained which essentially improve, extend, and simplify some known conditions. These results will be applie
Externí odkaz:
https://doaj.org/article/53c9190e5a62471b9e65ea3b765e16da
Autor:
Carol A. Wang, John R. Attia, Stephen J. Lye, Wendy H. Oddy, Lawrence Beilin, Trevor A. Mori, Claire Meyerkort, Craig E. Pennell
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
Abstract It is well established that genetics, environment, and interplay between them play a crucial role in adult disease. We aimed to evaluate the role of genetics, early life nutrition, and the interaction between them, on optimal adult health. A
Externí odkaz:
https://doaj.org/article/218f5eac787847dba1b35fbd117a538f
Autor:
Emad R. Attia
Publikováno v:
Advances in Difference Equations, Vol 2021, Iss 1, Pp 1-12 (2021)
Abstract We study the oscillation of a first-order linear delay differential equation. A new technique is developed and used to obtain new oscillatory criteria for differential equation with non-monotone delay. Some of these results can improve many
Externí odkaz:
https://doaj.org/article/3b6a7d911441452389bbde19d66e601b