In this work, we modified a dynamical system that addresses COVID-19 infection under fractal-fractional-order derivative. The model investigates the psychological effects of disease on humans. We establish global and local stability results for aforementioned Additionally, compute fundamental reproduction number, which helps predict transmission in community. Using Carlos Castillo-Chavez method...

Consideration of the Current-voltage (I-V) characteristics variations of solar modules with temperature and irradiations variations is basic for maximum power point tracking (MPPT). Having a simple and accurate mathematical model for the optimize utilization of the solar modules is essential. In this paper, a novel modeling of photovoltaic systems with novel coefficients is proposed for mathema...

Consideration of the Current-voltage (I-V) characteristics variations of solar modules with temperature and irradiations variations is basic for maximum power point tracking (MPPT). Having a simple and accurate mathematical model for the optimize utilization of the solar modules is essential. In this paper, a novel modeling of photovoltaic systems with novel coefficients is proposed for mathema...