International Journal of Systems Science and Applied Mathematics

Archive

Volume 9, Issue 2, June 2024

  • Research Article

    A Mathematical Model to Investigate How Vaccination Affect the Reproduction Number for COVID-19

    Nandwa Khayo Geofrey*, Makwata Harun, Muthiga Samuel, Njuguna Edward

    Issue: Volume 9, Issue 2, June 2024
    Pages: 20-29
    Received: 6 January 2024
    Accepted: 30 January 2024
    Published: 12 June 2024
    DOI: 10.11648/j.ijssam.20240902.11
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    Abstract: In this paper a mathematical model that investigates how vaccination affects the dynamics of COVID-19 was considered. More particularly the model takes into account the waning rate of immunity after vaccination as well as administration of booster vaccine. Posititivity and boundedness of solutions of the model were proved. The disease free equilibr... Show More
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  • Research Article

    New Functional Orbital-free Within DFT for Metallic Systems

    Vittoria Urso*

    Issue: Volume 9, Issue 2, June 2024
    Pages: 30-36
    Received: 1 May 2024
    Accepted: 9 July 2024
    Published: 4 August 2024
    DOI: 10.11648/j.ijssam.20240902.12
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    Abstract: I present the continuation of a study on Laplacian Level Kinetic Energy (KE) functionals applied to metallic nanosystems. The development of novel Kinetic Energy functionals is an important topic in density functional theory (DFT). The nanoparticles are patterned using gelatin spheres of different sizes, background density and number of electrons. ... Show More
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