Mahamat Saleh Daoussa Haggar

Faculté des Sciences Exactes et Eppliquées
Université de N’Djaména
BP : 1027
Tchad 

+235 66 29 48 69
+235 99 29 48 69

msdhaggar@l2mias.com
msdhaggar@gmail.com

 

Professeur Mahamat Saleh Daoussa Haggar

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Publications

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  1. IS Abdallah, PM Tchepmo Djomegni, MS Daoussa Haggar. Optimal control strategies of cell infections in a covid-19 model with inflammatory response. Alexandria Engineering Journal 69, 747-757. (2023) https://doi.org/10.1016/j.aej.2023.02.017
  2. MS Daoussa Haggar and M Mbehou. Optimal error estimates of a linearized second-order BDF scheme for a nonlocal parabolic problem. Arab J of Math Sci. (2023) https://doi.org/10.1108/AJMS-05-2022-0126
  3. H. Olei Tahar, M S Daoussa Haggar and M Mbehou. On the two-step BDF Finite Element Methods for the Incompressible Navier-Stokes Problem under boundary conditions of Friction type. Results in Applied Mathematics 17, 100349 (2023) https://doi.org/10.1016/j.rinam.2022.100349
  4. A H Adoum, M S Daoussa Haggar, T Djaokamla and J M Ntaganda. A Mathematical Model of Glucose Homeostasis in Chad Context. J. of Ramanujan Society of Mathematics and Mathematical Sciences 10(1), 153-166 (2022). https://doi.org/10.56827/JRSMMS.2022.1001.13
  5. Cyr. S. Ngamouyih Moussata, M S Daoussa Haggar and B Mampassi. An inverse Formulation for identifying the Silting process of River Banks. Universal Journal of Mathematics and Mathematical Sciences 17, 31-45 (2022)  http://dx.doi.org/10.17654/2277141722010
  6. M Mbehou, M S Daoussa Haggar and P M Tchepmo Djomegni. Finite Element Method for Nonlocal Problems of Kirchhoff-Type in Domains with Moving Boundary. Scientific African 16, e01256 (2022) https://doi.org/10.1016/j.sciaf.2022.e01256
  7. J M Ntaganda, M S Daoussa Haggar and A Dukunde. Fuzzy Logic Strategy Implemented on an Optimal Control Problem of Hypoxemic Hypoxia Tissue Blood Dioxide Carbon Exchange : Cardiovascular-Respiratoty System Response to Exercise. International Journal of Science Academic Research 3(5), 3816-3822 (2022)
  8. M Mbehou and M S Daoussa Haggar and H Olei Tahar. Stability Analysis of the Crank-Nicolson Finite Element Method for the Navier-Stokes Equations Driven by Slip Boundary Conditions. Hindawi, Journal of Applied Mathematics 2022, ID7742867, 13 pages https://doi.org/10.1155/2022/7742867
  1. S Njipouakouyou and M S Daoussa Haggar. Investigating the Best Fitting Empirical Function Between Power and Exponential Ones. International Journal of Science Academic Research 2(9), 3043-3049 (2021)
  2. A M Layaka, B Abbo, M S Daoussa Haggar and P Youssouf. Optimal Control Analysis of Intra-Host Dynamics of Malaria with Immune Response. Advances in Dynamical Systems and Applications 16(2), 1097-1115 (2021)
  3. S Njipouakouyou and M S Daoussa Haggar. Comparative study of the three Frequent Encountered Numerical Methods of integration with Emphasis on their terms. International Journal of Science Academic Research 2(8), 2050-2059 (2021)
  4. A M Layaka, B Abbo and M S Daoussa Haggar and P Youssouf. Modelling and stability analysis of immnuse regulatory mecanisms During malarria malarrie loog stage infection. Advances in Differential Equations and Control Processes 24(1), 11-39 (2021)
  5. P M Tchepmo Djomegni, M S Daoussa Haggar and W T Adigo. Mathematical model for Covid-19 with “protected susceptible” in the post-lockdown era. Alexandria University Alexandria Engineering Journal 60(1), 527–535 (2021) https://doi.org/10.1016/j.aej.2020.09.028
  6. M S Daoussa Haggar and M Mbehou. On the Numerical Solution of the Nonlocal Elliptic Problem With a p−Kirchhoff-Type Term. Appl. Math. Inf. Sci. 15(5), 547−553(2021)  http://dx.doi.org/10.18576/amis/150502
  1. M S Daoussa Haggar, J M Ntaganda and B Mampassi. A Two delay Differential Equations Model of Glucose and Insilin in Diabetic Humans During Physical Activity. Far East Journal of Applied Mathematics 95(5), 343-364 (2016).
  2. M Gahamanyi, J M Ntaganda, M S Daoussa Haggar. Perturbation – Iteration Method for solving mathematical model of Glucose and Insilin in Diabetic Human during Physical Activity. Open Journal of Applied Sciences 6, 826-838 (2016)
  3. S Ndeuzoumbet, M S Daoussa Haggar, and B Mampassi. On an Extension of Chebyshev – Pade Approximants. Theoretical Mathematics and Applications 6(4), 103-116 (2016)
  4. M T Abdoul-karim, S Ndeuzoumbet, M S Daoussa Haggar,. and B Mampassi. A numerical characterization of Hopf bifurcation points for multiple delayed differential systems. International Journal of Applied Mathematics Sciences 8(4), 253 – 262 (2015)
  5. J M Ntaganda , M S Daoussa Haggar, and B Mampassi. Fuzzy logic strategy for solving an optimal control problem of therapeutic hepatitis C virus dynamics. Open Journal of Applied Sciences 5, 527 – 541 (2015)
  6. M S Daoussa Haggar and B Mampassi. On the determination of solutions sets regarding highly non – linear equations systems. International Journal of Applied Mathematics 28(4), 356 – 361 (2015)
  1. H Nkounkou, A Traore, M S Daoussa Haggar, and B Mampassi. Solving Convection Diffusion Problems with a Pseudo spectral Method on unstructured meshes. Pioneer Journal of Computer Science and Engineering Technology 7(1-2), 1 -12, (2014).
  2. M S Daoussa Haggar, B Mampassi, N Ngarasta. Analyse numerique et epidemiologie. Editions Universitaires Europeennes, 978-3-8417-4887- 4 (2014).
  3. J M Ntaganda, M S Daoussa Haggar, and B Mampassi. Fuzzy logic solving an optimal control problem of Hypoxemic Hypoxia Tissue Blood Carbon Dioxide Exchange During Physical Activity. Open Journal of Applied Sciences 4, 501 – 514 (2014)
  4. M S Daoussa Haggar, J M Ntaganda and B Mampassi. Numerical Simulation of transition Phases of the HIV/AIDS in the Frame Work of Therapeutic Protocols. American Journal of Mathematics and Mathematical Sciences 3(1), 161 – 180 (2014)
  5. M T A Karim, M S Daoussa Haggar, N Ngarasta, F D R Langa and B Mampassi. Numerical Simulation of Optimal Control of a Delay Mathematical Model of the human Cardiovascular and Respiratory System. Pioneer Journal of Mathematics and Mathematical Sciences 6(1), 1-16 (2012).
  6. M S Daoussa Haggar, H Nkounkou, M T A Karim, F D R Langa, J M Ntanganda and
    B. Mampassi. Asymptotic States of the Cardiovascular and Respiratory System During Physical Activity. Far East Journal of Applied Mathematics 59(2), 123-147 (2011).
  7. F D R Langa, M T A Karim, M S Daoussa Haggar and B Mampassi. An Approach for Determining Hopf Bifurcation Points of Multiple delayed Linear Differential Systems. Pioneer Journal of Computer Science and Engineering Technology 2(1), 35-42 (2011).