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Uniqueness of Positive Radial Solutions for a Class of Semipositone Systems on the Exterior of a Ball

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Applied Mathematics 2021年第3期12卷 131-146页

作者： Alhussein Mohamed Khalid Ahmed Abbakar Abuzar Awad Omer Khalil bechir mahamat acyl Abdoulaye Ali Youssouf Mohammed Mousa College of Mathematics and Statistics Northwest Normal University Lanzhou China Department of Mathematics and Physics Faculty of Education University of Gadarif Gadarif Sudan Department of Science College of Education Sudan University of Science and Technology Khartoum Sudan

In this paper, we study the positive radial solutions for elliptic systems to the nonlinear BVP: , where Δu = div (∇u) and Δv = div (∇v) are the Laplacian of u, λ is a positive parameter, Ω = {x ∈ Rn : N > 2, |x| > r0, r0 > 0}, let i = [1,2] then Ki :[r0,∞] → (0,∞) is a continuous function such that limr→∞ ki(r) = 0 and is The external natural derivative, and : [0, ∞) → (0, ∞) is a continuous function. We discuss existence and multiplicity results for classes of f with a) fi > 0, b) fi fi = 0. We base our presence and multiple outcomes via the Sub-solutions method. We also discuss some unique findings.

关键词： Elliptic System Positive Radial Solution Exterior Domains Fixed Point Index

Commutator of Marcinkiewicz Integral Operators on Herz-Morrey-Hardy Spaces with Variable Exponents

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Applied Mathematics 2021年第5期12卷 421-448页

作者： Omer Khalil Shangping Tao bechir mahamat College of Mathematics and Statistics Northwest Normal University Lanzhou China Faculty of Education Sudan University of Science and Technology Khartoum Khartoum State Sudan

In this paper, our aim is to prove the boundedness of commutators generated by the Marcinkiewicz integrals operator [b,μΩ] and obtain the result with Lipschitz function and BMO function f on the Herz-Morrey-Hardy sp... 详细信息

关键词： Marcinkiewicz Integral Operator Herz-Morrey-Hardy Space Commutator Variable Exponent Lipschitz Space

Global Bounded Solutions for the Keller-Segel Chemotaxis System with Singular Sensitivity

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Applied Mathematics 2020年第10期11卷 985-990页

作者： Khalid Ahmed Abbakar Omer Khalil Alhussein Mohamed bechir mahamat Abdoulaye Ali Abeer Alhadi College of Mathematics and Statistics Northwest Normal University Lanzhou China Department of Mathematics and Physics Faculty of Education University of Gadarif Gadarif Sudan College of Physics and Electronic Engineering Northwest Normal University Lanzhou China

In this paper, we consider the Neumann initial-boundary value problem for the Keller-Segel chemotaxis system with singular sensitivity (0.1) is considered in a bounded domain with smooth boundary, Ω ⊂Rn (n ≥ 1), where d1 > 0, d2 > 0 with parameter χ ∈ R. When d1 = d2 + χ, satisfying for all initial data 0 ≤ n0 ∈ C0 and 0 v0∈ W1,∞ (Ω), we prove that the problem possesses a unique global classical solution which is uniformly bounded in Ω × (0, ∞).

关键词： Keller-Segel System Chemotaxis Global Bounded Solution Singular Sensitivity

Social Services for Mobile Pastoralists： Cross-sector Strategy Based on ＂One Health＂

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Journal of Sociology Study 2012年第9期2卷 705-714页

作者： mahamat bechir Zinsstag Jakob mahamat Abdoulaye Schelling Esther Kessely Hamit Fokou Gilbert Moto Daugla Bonfoh Bassirou Tanner Marcel University of N'Djamena Chad Centre de Support en Sante lnternationale Chad Swiss Tropical and Public Health Institute/University ofBasel Swiss Centre Suisse de Recherche Scientifique Cite d'Ivoire

Mobile pastoralist communities in Sahel countries have serious problems of access to social services. Classic strategies for social services were always based on a single sector, focused on settled populations, and hardly reached mobile communities. This paper aims to show a cross‐sector approach as a part of solutions to provide social services for mobile pastoralist communities and describes the ongoing scaling‐up process. The method used is based on a transdisciplinary approach which involves target communities and authorities in all processes through workshops and site visits. Interventions adopted the concept of "one health" benefiting of an added value of closer cooperation between human and animal health. This approach was tested with joint interventions between human and animal health, which provided access to health services for unreached communities and saved resource when compared with single sector intervention. Such approaches could be extended to other social services within cross‐sector interventions such as the delivery of basic education in nomadic areas. Such a strategy was validated by the communities and authorities and was further transformed into a national programme after a series of six national stakeholders’ seminars. The cross‐sector intervention will provide a minimum package of services (MPS) without compromising the structural services.

关键词：社会服务动物健康移动牧民萨赫勒地区利益相关者资源保存保健服务