Minimal wave speed and traveling wave in nonlocal dispersion SIS epidemic model with delay

Rassim Darazirar; Rasha M. Yaseen; Ahmed A. Mohsen; Aziz Khan; Thabet Abdeljawad

doi:10.1186/s13661-025-02055-1

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Publication Date

Mon May 12 2025

Journal Name

Boundary Value Problems

Volume

2025

DOI

10.1186/s13661-025-02055-1

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Minimal wave speed and traveling wave in nonlocal dispersion SIS epidemic model with delay

Basic reproduction number

Minimal wave speed

SIS model

Traveling waves

Rassim Darazirar

Rasha M. Yaseen

Ahmed A. Mohsen

Aziz Khan

Thabet Abdeljawad

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This study examines traveling wave solutions of the SIS epidemic model with nonlocal dispersion and delay. The research shows that a key factor in determining whether traveling waves exist is the basic reproduction number R0. In particular, the system permits nontrivial traveling wave solutions for σ≥σ∗ for R0>1, whereas there are no such solutions for σ<σ∗. This is because there is a minimal wave speed σ∗>0. On the other hand, there are no traveling wave solutions when R0≤1. In conclusion, we provide several numerical simulations that illustrate the existence of TWS.

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Publication Date

Sun Jan 13 2019

Journal Name

Iraqi Journal Of Physics

Chaos synchronization delay in semiconductor lasers with optoelectronic feedback

Chaos

Synchronization

Delay

Optoelectronic feedback.

Atyaf

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In this work we reported the synchronization delay in
semiconductor laser (SL) networks. The unidirectional
configurations between successive oscillators and the correlation
between them are achieved. The coupling strength is a control
parameter so when we increase coupling strength the dynamic of the
system has been change. In addition the time required to synchronize
network components (delay of synchronization) has been studied as
well. The synchronization delay has been increased by mean of
increasing the number of oscillators. Finally, explanation of the time
required to synchronize oscillators in the network at different
coupling strengths.

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Publication Date

Sat Sep 28 2024

Journal Name

Journal Of The Pakistan Medical Association

Pulse transmission time and amplitude of digital pulse wave determined by fingertip plethysmography as a surrogate marker of brachial artery flowmediated dilatation

Nada

Amal

Bassam Talib

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Objectives: To assess the changes in blood vessel stiffness and digital pulse wave amplitude because of flowmediateddilatation, and to explore how these two variables change when endothelial dysfunction isexperimentally induced.Method: The experimental study was conducted at the departments of physiology at the College of Medicine,Mustansiriyah University, and the College of Medicine, Al-Iraqia University, Baghdad, Iraq, from October 14, 2021, toMay 31, 2022, and comprised healthy young males who were subjected to the flow-mediated dilatation techniqueon the left brachial artery. Pulse transit time and the amplitude of the digital pulse wave were measured duringreactive hyperaemia for 2.5 minutes from the left middle finger using a

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Publication Date

Wed Dec 22 2021

Journal Name

Plos One

Awareness and preparedness of healthcare workers against the first wave of the COVID-19 pandemic: A cross-sectional survey across 57 countries

Adult

COVID-19

Cross-Sectional Studies

Education

Medical

Continuing

Female

Health Knowledge

Attitudes

Practice

Humans

Male

Personnel

Hospital

Socioeconomic Factors

Surveys and Questionnaires

Safad Riyadh

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Background

Since the COVID-19 pandemic began, there have been concerns related to the preparedness of healthcare workers (HCWs). This study aimed to describe the level of awareness and preparedness of hospital HCWs at the time of the first wave.

Methods

This multinational, multicenter, cross-sectional survey was conducted among hospital HCWs from February to May 2020. We used a hierarchical logistic regression multivariate analysis to adjust the influence of variables based on awareness and preparedness. We then used association rule mining to identify relationships between HCW confidence in handling suspected

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Publication Date

Sat Sep 01 2018

Journal Name

2018 11th International Conference On Developments In Esystems Engineering (dese)

Natural Rivers Longitudinal Dispersion Coefficient Simulation Using Hybrid Soft Computing Model

Sadeq Oleiwi

Ghassan

H A

...Show More Authors

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Publication Date

Wed Apr 24 2019

Journal Name

Annals Of Telecommunications

Traveling distance estimation to mitigate unnecessary handoff in mobile wireless networks

Qusay

...Show More Authors

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Publication Date

Wed Jan 26 2022

Journal Name

Bmc Public Health

Investigating the current environmental situation in the Middle East and North Africa (MENA) region during the third wave of COVID-19 pandemic: urban vs. rural context

Thuraya

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Abstract<sec> <title>Background

Coronavirus 2019 (COVID-19) pandemic led to a massive global socio-economic tragedy that has impacted the ecosystem. This paper aims to contextualize urban and rural environmental situations during the COVID-19 pandemic in the Middle East and North Africa (MENA) Region.

Results

An online survey was conducted, 6770 participants were included in the final analysis, and 64% were females. The majority of the participants were urban citizens (74%). Over 50% of the urban residents significantly (p

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Publication Date

Wed Dec 29 2021

Journal Name

Al-khwarizmi Engineering Journal

Comparison of Prediction Programs for Short Wave Circuit Link from Iraq to Test points on Both Earth Hemispheres during Solar Minimum

Ahmed Kadhim

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This paper compare the accurecy of HF propagation prediction programs for HF circuits links between Iraq and different points world wide during August 2018 when solar cycle 24 (start 2009 end 2020) is at minimun activity and also find out the best communication mode used. The prediction programs like Voice of America Coverage Analysis Program (VOACAP) and ITU Recommendation RS 533 (REC533 ) had been used to generat HF circuit link parameters like Maximum Usable Frequency ( MUF) and Frequency of Transsmision (FOT) .Depending on the predicted parameters (data) , real radio contacts had been done using a radio transceiver from Icom model IC 7100 with 100W RF

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(2)

(1)

Publication Date

Wed Feb 22 2023

Journal Name

Iraqi Journal Of Science

More on the Minimal Set of Periods

mainfolds

transveral map

Lefschetz number

Lefschetz number for periodic points

Afraa

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Let M be a n-dimensional manifold. A C1- map f : M  M is called transversal if for all m N the graph of fm intersect transversally the diagonal of MM at each point (x,x) such that x is fixed point of fm. We study the minimal set of periods of f(M per (f)), where M has the same homology of the complex projective space and the real projective space. For maps of degree one we study the more general case of (M per (f)) for the class of continuous self-maps, where M has the same homology of the n-dimensional sphere.

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Publication Date

Mon Jul 01 2019

Journal Name

Iop Conference Series: Materials Science And Engineering

“Small wave number and less of Reynolds number inflow analysis in peristaltic transportation of “Hyperbolic tangent fluid” in curved channels by employing the influence of radial magnetic force”

T Sh

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Abstract<p>Through this article, we studied the peristaltic motion of “Hyperbolic Tangent” fluid in the geometry of curvature channel by using the analysis of large wavelength and less of Reynolds number. The matter has controlled mathematically by the partial differential equations of continuity, motion, heat transfer. In the study, we used the impact of radial magnetic force. The obtained coupled non-linear equations of above equations have solved by an approximation technical. Locked formula solutions of the stream function, axial velocity, heat function has evaluated. The influence of curvature is analysed and took it into account. The impact of sundry variables on the inflow features ha</p> ... Show More

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(1)

Publication Date

Tue Mar 16 2021

Journal Name

International Journal For Computational Methods In Engineering Science And Mechanics

Determination of time-dependent coefficients in moving boundary problems under nonlocal and heat moment observations

Z.

M.S.

D.

...Show More Authors

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