scholarly journals Modelling the Impacts of Early Intervention on Desert Locust Outbreak Prevention

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Dejen Ketema Mamo ◽  
Dejene Shewakena Bedane
Keyword(s):  
Early Intervention ◽  
Crop Production ◽  
Significant Feature ◽  
Early Interventions ◽  
Desert Locust ◽  
Asymptotically Stable ◽  
Interior Equilibrium ◽  
Intervention Measures ◽  
Theoretical Results ◽  
Production Losses

To preserve crop production losses, monitoring of desert locust attacks is a significant feature of agriculture. In this paper, a mathematical model was formulated and analyzed to protect crops against desert locust attack via early intervention tactics. We consider a triple intervention approach, namely, proaction, reaction, and outbreak prevention. The model integrates a stage-structured locust population, logistics-based crop biomass, and blended early intervention via pesticide spray. We assume that the amount of pesticide spray is proportional to the density of the locust population in the infested area. Conventional short residual pesticides within ultralow volume formulation and equipment control operations are considered. The trivial and locust-free equilibrium of the model is unstable, whereas the interior equilibrium is asymptotically stable. Numerical simulations validate the theoretical results of the model. In the absence of intervention measures, desert locust losses are approximately 71% of expected crop production. The model projection shows that effective proactive early intervention on hopper stage locust contained locust infestation and subdued public health and environmental hazards. Relevant and up-to-date combined early interventions control desert locust aggression and crop production losses.

NUMERICAL AND STABILITY ANALYSIS OF THE TRANSMISSION DYNAMICS OF SVIR EPIDEMIC MODEL WITH STANDARD INCIDENCE RATE

2019 ◽  
Vol 4 (2) ◽  
pp. 349 ◽  
Author(s):  
Oluwatayo Michael Ogunmiloro ◽  
Fatima Ohunene Abedo ◽  
Hammed Kareem
Keyword(s):  
Reproduction Number ◽  
Disease Spread ◽  
Asymptotically Stable ◽  
Equilibrium Solutions ◽  
Transform Method ◽  
Globally Asymptotically Stable ◽  
Differential Transform ◽  
Mathematical Techniques ◽  
Fourth Order Method ◽  
Theoretical Results

In this article, a Susceptible – Vaccinated – Infected – Recovered (SVIR) model is formulated and analysed using comprehensive mathematical techniques. The vaccination class is primarily considered as means of controlling the disease spread. The basic reproduction number (Ro) of the model is obtained, where it was shown that if Ro<1, at the model equilibrium solutions when infection is present and absent, the infection- free equilibrium is both locally and globally asymptotically stable. Also, if Ro>1, the endemic equilibrium solution is locally asymptotically stable. Furthermore, the analytical solution of the model was carried out using the Differential Transform Method (DTM) and Runge - Kutta fourth-order method. Numerical simulations were carried out to validate the theoretical results. 

scholarly journals Parents’ Perceptions of Early Interventions and Related Services for Children with Autism Spectrum Disorder in Saudi Arabia

2016 ◽  
Vol 9 (10) ◽  
pp. 128 ◽  
Author(s):  
Faihan Alotaibi ◽  
Nabil Almalki
Keyword(s):  
Autism Spectrum Disorder ◽  
Saudi Arabia ◽  
Early Intervention ◽  
Children With Autism ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Early Interventions ◽  
Related Services ◽  
Children With Asd ◽  
The Government

<p class="apa">The present study sought to examine parents’ perceptions of early interventions and related services for children with autism spectrum disorder (ASD) in Saudi Arabia. In this study a survey was distributed to a sample of 80 parents with children who have ASD. Parents also were asked open-ended questions to enable them to provide suggestions. The findings indicate that parents have varying perceptions of early interventions and related services. However, they seem to agree that these services are important in assisting their children. Accordingly, parents have suggested that the government needs to increase these services by providing more centers for children with ASD in Saudi Arabia, providing more specialists to deal with children with ASD, promoting inclusion in regular schools and providing more information on early intervention.</p>

Global Dynamics of a Holling-II Amensalism System with Nonlinear Growth Rate and Allee Effect on the First Species

2021 ◽  
Vol 31 (03) ◽  
pp. 2150050
Author(s):  
Demou Luo ◽  
Qiru Wang
Keyword(s):  
Growth Rate ◽  
Allee Effect ◽  
Global Dynamics ◽  
Asymptotically Stable ◽  
Globally Asymptotically Stable ◽  
Nonlinear Growth ◽  
Trivial Equilibrium ◽  
Existence And Stability ◽  
Stable Equilibria ◽  
Theoretical Results

Of concern is the global dynamics of a two-species Holling-II amensalism system with nonlinear growth rate. The existence and stability of trivial equilibrium, semi-trivial equilibria, interior equilibria and infinite singularity are studied. Under different parameters, there exist two stable equilibria which means that this model is not always globally asymptotically stable. Together with the existence of all possible equilibria and their stability, saddle connection and close orbits, we derive some conditions for transcritical bifurcation and saddle-node bifurcation. Furthermore, the global dynamics of the model is performed. Next, we incorporate Allee effect on the first species and offer a new analysis of equilibria and bifurcation discussion of the model. Finally, several numerical examples are performed to verify our theoretical results.

scholarly journals Global Stability and Hopf-bifurcation Analysis of Biological Systems using Delayed Extended Rosenzweig-MacArthur Model

2018 ◽  
Vol 12 (2) ◽  
pp. 171
Author(s):  
Enobong E. Joshua ◽  
Cec Ekemini T. Akpan
Keyword(s):  
Experimental Data ◽  
Population Dynamics ◽  
Hopf Bifurcation ◽  
Asymptotic Stability ◽  
Asymptotically Stable ◽  
Stability Switches ◽  
Large Delay ◽  
Local Hopf Bifurcation ◽  
Delay Margin ◽  
Theoretical Results

This paper investigates the global asymptotic stability of a Delayed Extended Rosenzweig-MacArthur Model via Lyapunov-Krasovskii functionals. Frequency sweeping technique ensures stability switches as the delay parameter increases and passes the critical bifurcating threshold.The model exhibits a local Hopf-bifurcation from asymptotically stable oscillatory behaviors to unstable strange chaotic behaviors dependent of the delay parameter values.Hyper-chaotic fluctuations were observed for large delay values far away from the critical delay margin. Numerical simulations of experimental data obtained via non-dimensionalization have shown the applications of theoretical results in ecological population dynamics.

scholarly journals A Delay Differential Equation Model of HIV Infection, with Therapy and CTL Response

2014 ◽  
Vol 9 ◽  
pp. 53-68 ◽  
Author(s):  
B. El Boukari ◽  
N. Yousfi
Keyword(s):  
Reproduction Number ◽  
Equation Model ◽  
Asymptotically Stable ◽  
Differential Equation Model ◽  
Globally Asymptotically Stable ◽  
Intracellular Delay ◽  
Immunodeficiency Virus ◽  
Delay Differential ◽  
Theoretical Results ◽  
Disease Free

In this work we investigate a new mathematical model that describes the interactions betweenCD4+ T cells, human immunodeficiency virus (HIV), immune response and therapy with two drugs.Also an intracellular delay is incorporated into the model to express the lag between the time thevirus contacts a target cell and the time the cell becomes actively infected. The model dynamicsis completely defined by the basic reproduction number R0. If R0 ≤ 1 the disease-free equilibriumis globally asymptotically stable, and if R0 > 1, two endemic steady states exist, and their localstability depends on value of R0. We show that the intracellular delay affects on value of R0 becausea larger intracellular delay can reduce the value of R0 to below one. Finally, numerical simulationsare presented to illustrate our theoretical results.

A study to evaluate the provision of psychosocial supervision within an Early Intervention team

2010 ◽  
Vol 3 (2) ◽  
pp. 58-70 ◽  
Author(s):  
Sandra T. Neil ◽  
Sarah Nothard ◽  
David Glentworth ◽  
Elaine Stewart
Keyword(s):  
Early Intervention ◽  
Thematic Analysis ◽  
Psychosocial Interventions ◽  
Descriptive Statistics ◽  
Early Interventions ◽  
Structured Interviews ◽  
Team Members ◽  
Different Types ◽  
Intervention Team ◽  
The Uk

AbstractPsychosocial Interventions (PSIs) and PSI supervision underpin the delivery of early interventions for people experiencing psychosis. Early Intervention (EI) teams are relatively new in the NHS and there is currently a lack of empirical research into PSI supervision in this area. This study aimed to elicit staff views of PSI supervision and to identify any unmet supervision needs within a newly developed EI team in the UK. Semi-structured interviews were conducted with 16 multidisciplinary team members. Descriptive statistics and a thematic analysis were used to analyse the responses. The different types of supervision available to team members, gaps in the provision of PSI supervision and aspects that supervisees found helpful and unhelpful about PSI supervision are discussed as are ideas for improving the provision of PSI supervision in EI teams. The limitations of the study and ideas for further research are also outlined.

Application and Integration of Psychological First Aid in First Responder Organizations

2021 ◽  
pp. 813-837
Author(s):  
Emily F. Brucia ◽  
Matthew J. Cordova ◽  
Angelique Finestone ◽  
Josef I. Ruzek
Keyword(s):  
Early Intervention ◽  
Critical Incident ◽  
First Aid ◽  
Early Interventions ◽  
Trauma Recovery ◽  
First Responder ◽  
Critical Incident Stress Management ◽  
Critical Incident Stress ◽  
Psychological First Aid ◽  
Stress Debriefing

First responders are exposed to many potentially traumatic events throughout their careers. Given the risk of adverse mental and physical health outcomes secondary to frequent trauma exposure, access to culturally-sensitive, evidence-informed early intervention is paramount. Critical Incident Stress Management (CISM) and components therein (e.g., Critical Incident Stress Debriefing, peer support) represent the most commonly utilized early interventions within first responder organizations. Limited research has evaluated these models, and evaluation of early interventions presents many challenges due to characteristics of first responder cultures and organizational demands and constraints. Psychological First Aid (PFA) is a widely endorsed and promising evidence-informed early intervention model grounded in research on trauma recovery and resilience. This chapter examines the theoretical underpinnings and core actions of PFA and describes the potentially diverse applications of PFA within first responder organizations and concludes by discussing recommendations and future directions.

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